Diversidad de nematodos parásitos de peces en el Valle de Lerma, provincia de Salta (Argentina)

El objetivo de este trabajo de tesis fue ampliar y actualizar el conocimiento taxonómico y ecológico de los nematodos parásitos de peces en ambientes lóticos y lénticos pertenecientes a las Altas Cuencas de los ríos Bermejo y Juramento de la provincia de Salta.Asociación Parasitológica Argentin

New records of helminth parasites in two species of river fish, province of Salta, Argentina

En ríos y otros cursos de agua de la provincia de Salta se capturaron ejemplares de Trichomycterus spegazzini (Berg, 1897) y Jenynsia alternimaculata (Fowler, 1916); ambos resultaron parasitados por los nematodes Contracaecum sp. y Cucullanus (Cucullanus) pinnai pinnai (Travassos, Artigas & Pereira, 1928); el cestode Nomimoscolex sp. y metacestodes no identificados. El nematode Procamallanus (Spirocamallanus) pintoi (Kohn & Fernandes, 1988) y el digeneo Genarchella sp. infectaron sólo ejemplares de Trichomycterus spegazzini (Berg, 1897). A su vez, los nematodes Procamallanus (Spirocamallanus) hilarii (Vaz & Pereira, 1934) y Rhabdochona (Rhabdochona) acuminata (Molin, 1860) fueron exclusivos de los ejemplares de Jenynsia alternimaculata (Fowler, 1916). De este modo, se extendió la distribución geográfica de P (S.) hilarii, P (S.) pintoi, Contracaecum sp., Rhabdochona (R.) acuminata, C. (C.) pinnai pinnai, Nomimoscolex sp. y Genarchella sp., y se registraron como nuevos hospedadores a Trichomycterus spegazzini y Jenynsia alternimaculata, respectivamente.Specimens of Trichomycterus spegazzini (Berg, 1897) and Jenynsia alternimaculata (Fowler, 1916) were collected in rivers and other water courses in the province of Salta. Both species were parasitized with the nematode Contracaecum sp. and Cucullanus (Cucullanus) pinnai pinnai (Travassos, Ar tigas & Pereira, 1928), the cestode Nomimoscolex sp. and unidentified metacestodes. However, the nematode Procamallanus (Spirocamallanus) pintoi (Kohn & Fernandes, 1988) and the digenean Genarchella sp. infected only specimens of Trichomycterus spegazzini (Berg, 1897). Moreover, the nematodes Procamallanus (Spirocamallanus) hilarii (Vaz & Pereira), 1934 and Rhabdochona (Rhabdochona) acuminata (Molin, 1860) were exclusive of specimens of Jenynsia alternimaculata (Fowler, 1916). In addition, the geographical distribution of the following species was enlarged: P. (S.) hilarii, P (S.) pintoi, Contracaecum sp., Rhabdochona (R.) acuminata, C. (C.) pinnai pinnai, Nomimoscolex sp. and Genarchella sp. Furthermore, we recorded Trichomycterus spegazzini and Jenynsia alternimaculata as new hosts for these species.Fil: Ramallo, Geraldine. Universidad Nacional de Salta. Facultad de Ciencias Naturales. Instituto para el Estudio de la Biodiversidad de Invertebrados; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Ailan Choke, Lorena Gisela. Fundación Miguel Lillo. Dirección de Zoología. Instituto de Invertebrados; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Nieva, Lucia. Universidad Nacional de Salta. Facultad de Ciencias Naturales. Instituto para el Estudio de la Biodiversidad de Invertebrados; ArgentinaFil: Davies, Dora Ana. Universidad Nacional de Salta. Facultad de Ciencias Naturales. Instituto para el Estudio de la Biodiversidad de Invertebrados; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin

An integrative approach assesses the intraspecific variations of Procamallanus (Spirocamallanus) inopinatus, a common parasite in Neotropical freshwater fishes, and the phylogenetic patterns of Camallanidae

Integrative taxonomy was used to evaluate two component populations of Procamallanus (Spirocamallanus) inopinatus in Brazil and the phylogeny Camallanidae. Parasite populations were collected in the characiform Anostomoides passionis from River Xingu (Amazon basin) and Megaleporinus elongatus from River Miranda (Paraguay basin). Morphology was analysed using light and scanning electron microscopy (SEM). Genetic characterization was based on partial sequences of the 18S and 28S rDNA, and COI mtDNA. Phylogenies were based on 18S and COI due to data availability. Generalized Mixed Yule Coalescent (GMYC), Poisson Tree Process (PTP) and BEAST were used for species delimitation and validation. SEM revealed for the first time the presence of minute denticles and pore-like structures surrounding the oral opening, phasmids in females and confirmed other important morphological aspects. Statistical comparison between the two-component populations indicated morphometric variations, especially among males. The different component population of P. (S.) inopinatus showed variable morphometry, but uniform morphology and were validated as conspecific by the GMYC, PTP and BEAST. Some camallanid sequences in GenBank have incorrect taxonomic labelling. Host, environment and geographic aspects seem to be related to some lineages within Camallanidae; however, their real phylogenetic meanings are still unclear.Fil: Ailan Choke, Lorena Gisela. Universidad Nacional de Salta. Facultad de Ciencias Naturales. Instituto para el Estudio de la Biodiversidad de Invertebrados; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta; ArgentinaFil: Tavares, Luiz E. R.. Universidade Federal do Mato Grosso do Sul; BrasilFil: Luque, José L.. Universidade Federal do Rio de Janeiro; BrasilFil: Pereira, Felipe B.. Universidade Federal de Minas Gerais. Instituto de Ciências Biológicas; Brasi

Observations on two Procamallanus (Spirocamallanus) species (Nematoda: Camallanidae) from freshwater fishes in Argentina, including description of Procamallanus (Spirocamallanus) juana sp.nov

Helminthological examination of specimens of the freshwater fishes Pimelodus albicans Valenciennes (Pimelodidae), Pimelodella gracilis (Valenciennes) (Heptapteridae) and Hyphessobrycon anisitsi Eigenmann (Characidae), collected from the Salado River, province of Santiago del Estero, Argentina, revealed the presence of two species of parasitic nematodes, Procamallanus (Spirocamallanus) juana sp. nov. and Procamallanus (Spirocamallanus) hilarii (Camallanidae). Procamallanus (Spirocamallanus) juana sp. nov. was characterized by the presence of six visible pores located around the oral opening in both sexes, 14 cephalic papillae, buccal capsule with 5-7 spiral thickenings, three pairs of preanal papillae, and three pairs of postanal papillae, and conspicuous and pre-equatorial vulva in females. Procamallanus (Spirocamallanus) hilarii was recorded for the first time in Hyphessobrycon anisitsi from northern Argentina. Moreover, zoogeographical and host information for the genus Procamallanus (Spirocamallanus) is summarized.Fil: Ramallo, Geraldine. Fundación Miguel Lillo. Dirección de Zoología. Instituto de Invertebrados; ArgentinaFil: Ailan Choke, Lorena Gisela. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta; Argentina. Universidad Nacional de Salta. Facultad de Ciencias Naturales; Argentin

Deep in the systematics of Camallanidae (Nematoda): Using integrative taxonomy to better understand the phylogeny and consistency of diagnostic traits

Due to conflicts between classic and molecular systematics of Camallanidae, different data types were used for the first time, to better understand the evolutionary history and taxa consistency within this family. Genetic (18S and 28S rDNA; COI mtDNA), morphological and life history traits, were used to infer phylogenies using Bayesian inference, reconstructed from separated and concatenated datasets. Tree and morphological traits consistency were evaluated using the consistency index. Characters were mapped on the trees and the phylogenetic informativeness of genetic markers estimated. Phylogenetic informativeness of 18S provided better resolution for outer nodes, COI for inners, and 28S had an intermediate profile. New sequences for two camallanid species were obtained. Phylogenies of genetic and concatenated data largely agreed, showing more divergence in COI dataset, due to its higher mutation rate vs. stable morphology for diagnosing higher taxa. No genus sustained monophyly. Lack of autapomorphy and phylogenetic proximity supported the partition of Batrachocamallanus as synonym of Procamallanus and Spirocamallanus, which should not be considered as subgenera. Although traits of buccal capsule, male tail, habitat, host and biogeographic were highly consistent, intrinsic patterns varied according to different taxa assemblages. Morphological systematics of Camallanidae, based on buccal capsule is artificial for certain taxa.Fil: Ailan Choke, Lorena Gisela. Universidad Nacional de Salta. Facultad de Ciencias Naturales. Instituto para el Estudio de la Biodiversidad de Invertebrados; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta; ArgentinaFil: Pereira, Felipe B.. Universidade Federal de Minas Gerais; Brasi

Raphidascaris (Sprentascaris) saltaensis Ailán-Choke, Ramallo & Davies, 2017, sp. nov.

<i>Raphidascaris</i> (<i>Sprentascaris</i>) <i>saltaensis</i> sp. nov. <p>(Figs 1–2)</p> <p> <b>Type material.</b> Holotype: female CH-FML # 07663; paratypes: eight males and five females, of which nine specimens were used for SEM, CH-FML # 0 7665.</p> <p> <b>Type host.</b> <i>Rineloricaria steinbachi</i> Regan, (Siluriformes: Loricariidae) (IBIGEO-I # 355–422).</p> <p> <b>Type locality.</b> La Caldera River (24°35´40.07”S; 65°22´11”W), La Caldera Department, province of Salta, Northwest Argentina.</p> <p> <b>Etymology.</b> The new species is named for its geographical location in the province of Salta.</p> <p> <b>Site of infection.</b> Intestine.</p> <p> <b>Infection parameters.</b> Prevalence: 11.94% (8/67); media intensity: 2.63 per fish.</p> <p> <b>Measurements.</b> Table 1.</p> <p> <b>General description.</b> Medium sized nematodes. Cuticle bearing transverse striations. Mouth aperture triangular, two ventrolateral lips and one dorsal lip. Lips well-developed and oval-shaped; dorsal lip slightly smaller than the two ventrolateral ones. Dorsal lip bearing two double papillae, ventrolateral lips with one double papilla, one single papilla and one amphid. Lips with lateral membranous margins forming finger-shaped protrusions at each side. Membranous extensions at base of lips. Interlabia absent (Figs. 1 A–C; 2A–C). Excretory pore slightly posterior to nerve ring level. Lateral alae present in both sexes, beginning in lateral region below lips and reaching almost to tail tip. Muscular oesophagus short with expanded posterior half. Caudal alae absent in both sexes. Ventriculus shorter than wide, ventricular appendix longer than wide. Both sexes with conical tail, its distal tip slender and sharply pointed.</p> <p>Adult males (eight specimens): Spicules equal, simple with pointed distal tips. Twenty pairs of caudal papillae. Preanal papillae: Sixteen subventral pairs; counting from cloaca opening, the first until the seventh pair are closer to each other than the remaining pairs. Adanal papillae: only one subventral pair. Postanal papillae: three small subventral pairs. Lateral alae present, without the partition in the caudal region. Caudal alae absent. Conical tail (Fig. 1 G).</p> <p>Adult female (six specimens): Vulva preequatorial, posterior to oesophagus end level (Fig. 1 E). Eggs ovalshaped, with thick and rough shell provided with membranous striations, mature eggs larvated (Figs. 1 D). Conical tail (Figs. 1 F; 2D).</p> <p> <b>Remarks.</b> <i>Raphidascaris</i> (<i>Sprentascaris</i>) <i>saltaensis</i> <b>sp. nov.</b> is distinguished from their congeners, by possessing 16 pairs of preanal papillae, membranous elevations below the lips, mature eggs with striated shell and the size of spicules (0.24 mm). For more detailed description of morphometric differences between the new species and other species of <i>Raphidascaris</i> (<i>Sprentascaris</i>) see Table 2.</p> <p> <i>Raphidascaris</i> (<i>S.</i>) <i>saltaensis</i> <b>sp. nov</b>. differs from <i>R</i>. (<i>S</i>.) <i>mahnerti</i> and <i>R.</i> (<i>S.</i>) <i>lanfrediae</i> by the absence of caudal alae in the males; but shares this feature with <i>R.</i> (<i>S.</i>) <i>pimelodi</i>, <i>R.</i> (<i>S.</i>) <i>hypostomi</i> and <i>R.</i> (<i>S.</i>) <i>marano</i>. The new species presents lateral alae, which begins in the base of ventrolateral lips and extends almost to tail tip; no partition of this structure is observed, hence caudal alae are not present. <i>Raphidascaris</i> (<i>S.</i>) <i>saltaensis</i> <b>sp. nov</b> differs from <i>R.</i> (<i>S.</i>) <i>pimelodi</i> and <i>R.</i> (S.) <i>hypostomi</i> by the presence of lateral alae, and by the number of postanal papillae pairs; <i>R.</i> (<i>S.</i>) <i>saltaensis</i> possess three pairs, while <i>R.</i> (<i>S.</i>) <i>pimelodi</i> and <i>R.</i> (<i>S.</i>) <i>hypostomi</i> present five pairs and lack lateral alae (Moravec 1998).</p> <p> <i>Raphidascaris</i> (<i>S.</i>) <i>saltaensis</i> <b>sp. nov</b>. resembles <i>R.</i> (<i>S.</i>) <i>marano</i>, both species have lateral alae and three pairs of postanal papillae; but can readily be distinguished by the number of preanal papillae (16 vs. 22), the shape and size of lips (smaller and different lips with protrusions vs. longer, symmetrical, simple and equal lips), shape of eggs (rough-shelled vs. thin-shelled) and the spicule length (0.24 vs. 0.27) (Moravec 1998; Ramallo 2009).</p> <p> <b>Discussion.</b> Five genera of Anisakidae have been reported from the intestine of Neotropical freshwater fishes: <i>Goezia</i> (Zeder, 1800), <i>Hysterothylacium</i> (Ward and Magath, 1917), <i>Terranova</i> (Leiper and Atkinson, 1914), <i>Raphidascaroides</i> (Yamaguti, 1941) and <i>Raphidascaris</i> (Railliet and Henry, 1915). <i>Goezia</i>, <i>Hysterothylacium</i> and <i>Raphidascaris</i> show a broad geographical distribution including Mexico, Guyana, Venezuela, Brazil, Paraguay, Peru and Argentina; in contrast <i>Raphidascaroides</i> and <i>Terranova</i> were only recorded in Brazil and Venezuela (Moravec 1998). <i>Raphidascaris</i> has two subgenera: <i>Raphidascaris</i> (not in the Neotropical region), and <i>Sprentascaris</i> whose members are restricted to South America and were only reported in freshwater fishes (Ramallo 2009). Species of <i>Raphidascaris</i> (<i>Sprentascaris</i>) are characterized by possessing a cuticular ring without spines, the presence of small postlabial or interlabial cuticular elevations, absence of true interlabia; the excretory pore slightly posterior to nerve ring level, a muscular oesophagus with ventriculus and ventricular appendix; and no intestinal caecum (Moravec 1998).</p> <p> All species of <i>Raphidascaris</i> (<i>Sprentascaris</i>), except <i>R.</i> (<i>S.</i>) <i>lanfrediae</i>, have Siluriformes fishes as hosts. <i>Raphidascaris</i> (<i>S.</i>) <i>hypostomi</i> was isolated from specimens of the subfamilies: Hypostominae and Ancistrinae (all Loricariidae) (Moravec 1998). Eiras <i>et al.</i> (2010) found nematodes identified as <i>R.</i> (<i>S.</i>) <i>hypostomi</i> and <i>R.</i> (<i>S.</i>) <i>mahnerti</i> in <i>Metynnis lippincottianus</i> Cope (Characiformes, Serrasalmidae) from Brazil. <i>Raphidascaris</i> (<i>S.</i>) <i>mahnerti</i> was also reported in Loricariidae fishes; moreover Moravec <i>et al.</i> (1993) recorded the third larval stage of <i>Raphidascaris</i> (<i>Sprentascaris</i>) in the intestine of the cichlid <i>Geophagus brasiliensis</i> Quoy & Gaimard, (Perciformes, Cichlidae). The larva is probably conspecific with <i>R.</i> (<i>S.</i>) <i>mahnerti</i> and <i>G. brasiliensis</i> could be a paratenic host (Moravec 1998). This is not the only time <i>Raphidascaris</i> (<i>Sprentascaris</i>) was detected in cichlids; Melo <i>et al</i>. (2011) reported the adults of <i>R.</i> (<i>S.</i>) <i>lanfrediae</i> in <i>Satanoperca jurupari</i>. Possibly, this species share the host spectrum with <i>R.</i> (<i>S.</i>) <i>mahnerti</i>. Both species might be closely related but they can be differentiated by morphological features and their geographical distribution (Melo <i>et al</i>. 2011). <i>Raphidascaris</i> (<i>S.</i>) <i>pimelodi</i> is distinguished from other known species of the subgenus, because it was only detected in a pimelodid species.</p> <p> Although <i>R.</i> (<i>S.</i>) <i>marano</i> and <i>Raphidascaris</i> (<i>S.</i>) <i>saltaensis</i> <b>sp. nov.</b> have both been recorded in Northwest of Argentina, they inhabit different fluvial systems; <i>R.</i> (<i>S.</i>) <i>marano</i> in Marapa River (basin of Sali River, provinces of Tucumán and Catamarca), and <i>R.</i> (<i>S</i>.) <i>saltaensis</i> <b>sp. nov</b>. in La Caldera River (basin of the Bermejo River, province of Salta). Ramallo (2009) proposed that <i>R.</i> (<i>S.</i>) <i>marano</i> would be an endemic species in Argentina, following the endemic character of its host, <i>H. cordovae</i> (Loricariidae). However, <i>H. cordovae</i> is synonymous of <i>H. paranensis</i>, thus the geographical distribution was extended to include Paraguay (Paraguay River basin, the main tributary of Paraná River) (Ferraris 2007). The new parasite species was found from <i>Rineloricaria steinbachi</i> (Loricariidae), whose geographical distribution is limited to southern Bolivia and northwestern Argentina, including the basins of the Bermejo (Rivers Bermejo, San Andrés, La Caldera, Mojotoro and Vaqueros and streams Gallinato and Pucheta), Juramento (Rivers Salado, Piedras, Arias Arenales, Rosario, Aguas Negras and Calchaquí), Pilcomayo River, and also the Dorado River basin (La Sala stream and Popayan River).</p> <p> In this paper, we propose the erection of the sixth species of <i>Raphidascaris</i> (<i>Sprentascaris</i>) from the Neotropical region and the second from Argentina. <i>Raphidascaris</i> (<i>S.</i>) <i>saltaensis</i> <b>sp. nov</b>. differs from all congeners in the number of preanal papillae, the shape and size of lips, the egg’s shell and the spicules length. The new identification key presented in the article incorporates <i>R.</i> (<i>S.</i>) <i>lanfrediae</i> <i>,</i> <i>R.</i> (<i>S.</i>) <i>marano</i> <i>and</i> <i>R.</i> (<i>S.</i>) <i>saltaensis</i> <b>sp. nov.</b></p>Published as part of <i>Ailán-Choke, Lorena Gisela, Ramallo, Geraldine & Davies, Dora, 2017, New species of Raphidascaris (Sprentascaris) (Nematoda: Anisakidae) in Rineloricaria steinbachi (Actinopterygii: Loricariidae) from Northwest Argentina, pp. 129-136 in Zootaxa 4231 (1)</i> on pages 130-135, DOI: 10.11646/zootaxa.4231.1.10, <a href="http://zenodo.org/record/293599">http://zenodo.org/record/293599</a&gt

Sprentascaris

Key to species of the subgenus <i>Sprentascaris</i> parasitic in Neotropical freshwater fishes <p>1 Males with caudal alae and six pairs of postanal papillae.......................................................2</p> <p>- Males without caudal alae and less than six pairs of postanal papillae.............................................3</p> <p> 2 Ventricular appendix/oesophageal length ratio in males and females is 1:0.16. Caudal alae well-developed. Vulva situated at 1.82–3.94 mm from anterior extremity, approximately at 1/3 of body length........................... <i>R.</i> (<i>S.</i>) <i>mahnerti</i></p> <p> - Ventricular appendix/oesophageal length ratio in males is 1:0.34 and in females 1:0.36. Caudal alae rudimentary. Vulva at short distance below oesophagus, at 0.40–1.06 mm from anterior extremity............................... <i>R.</i> (<i>S.</i>) <i>lanfrediae</i></p> <p>3 Lateral alae well developed (broad). In males, three pairs of postanal papillae......................................4</p> <p>- Lateral alae absent or rudimentary. In males, five pairs of postanal papillae........................................5</p> <p> 4 Symmetrical and equal lips. In males, 22 pairs of preanal papillae. In females, mature eggs embryonated, thin-shelled................................................................................................ <i>R.</i> (<i>S.</i>) <i>marano</i></p> <p> - Dorsal lips smaller than ventrolateral ones. In males, 16 pairs of preanal papillae. In females, mature eggs embryonated with rough shell and membranous striations................................................. <i>R.</i> (<i>S.</i>) <i>saltaensis</i> <b>sp. nov.</b></p> <p> 5 Narrow oesophagus. Rounded tail in both sexes. Posterior end of males with ventral cuticular ornamentation. Length of spic- ules 0.14 mm. Parasites of Pimelodidae fishes................................................... <i>R.</i> (<i>S.</i>) <i>pimelodi</i></p> <p> - Oesophagus markedly broad. Pointed tail tip in both sexes. Males with smooth posterior ventral surface. Length of spicules between 0.15–0.25 mm.................................................................... <i>R.</i> (<i>S.</i>) <i>hypostomi</i></p>Published as part of <i>Ailán-Choke, Lorena Gisela, Ramallo, Geraldine & Davies, Dora, 2017, New species of Raphidascaris (Sprentascaris) (Nematoda: Anisakidae) in Rineloricaria steinbachi (Actinopterygii: Loricariidae) from Northwest Argentina, pp. 129-136 in Zootaxa 4231 (1)</i> on page 135, DOI: 10.11646/zootaxa.4231.1.10, <a href="http://zenodo.org/record/293599">http://zenodo.org/record/293599</a&gt

Nematodos parásitos de peces del Río La Caldera, Salta, Argentina: Composición taxonómica y ecología parasitaria

El objetivo del trabajo es analizar la composición de las comunidades de nematodos parásitos de peces del río La Caldera (Salta) y evaluar diferencias entre los índices parasitológicos respecto al hidroperíodo y su correlación con la talla de los hospedadores. Se calculó prevalencia, intensidad y abundancia media. Para analizar las diferencias y relaciones se utilizaron pruebas de Chi-cuadrado, Mann-Whitney, y coeficiente de correlación de Spearman. A nivel de comunidades componentes, se estimó riqueza específica (S), diversidad (H´) y equitatividad (J). Se examinaron 79 Astyanax endy, 24 Jenynsia alternimaculata, 45 Trichomycterus spegazzinii y 66 Rineloricaria steinbachi. Se identificaron: Procamallanus (Spirocamallanus) hilarii en A. endy (P%=22,7; IM=1,61; AM=0,37); Rhabdochona acuminata en J. alternimaculata (P%=4,2;IM=1; AM=0,04); Cucullanus (Cucullanus) pinnai pinnai (P%=4,4; IM=2,5; AM=0,11); Rhabdochona acuminata (P%=11,1; IM=1,2; AM=0,13) y P. (S.) hilarii en T. spegazzinii (P%=2,2; IM=1; AM=0,02); y Raphidascaris (Sprentascaris) saltaensis en R. steinbachi (P%=12,1; IM=2,6; AM=0,32). La población de R. (S.) saltaensis fue la única con variaciones significativas en la prevalencia (X2=7,26, p= 0,007) y abundancia media (U=300, p=0,009) entre hidroperíodos. La abundancia de R. (S.) saltaensis en R. steinbachi mostró correlación positiva con la talla del hospedador (rs=0,42; p=0,001). Las comunidades se caracterizaron por baja riqueza específica (S=1), a excepción de la de T. spegazzini (S=3), con los valores más altos de diversidad y equitatividad (H´=0,92; J=0,84). Dado que estos parásitos se adquieren tróficamente, las variaciones podrían estar determinadas por la tasa de encuentros entre el hospedador y sus presas parasitadas. Estudios más abarcativos sobre los hábitos alimenticios de los hospedadores, aportarían información sobre la estructura de la red trófica en este ambiente y de qué manera los hospedadores se infectan con los diferentes parásitos.Fil: Ailan Choke, Lorena Gisela. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta; Argentina. Universidad Nacional de Salta. Facultad de Ciencias Naturales. Instituto para el Estudio de la Biodiversidad de Invertebrados; ArgentinaFil: Ramallo, Geraldine. Fundación Miguel Lillo. Dirección de Zoología. Instituto de Invertebrados; ArgentinaFil: Davies, Dora Ana. Universidad Nacional de Salta. Facultad de Ciencias Naturales. Instituto para el Estudio de la Biodiversidad de Invertebrados; ArgentinaVIII Congreso Argentino de ParasitologíaCorrientesArgentinaAsociación Argentina de Parasitologí

New species of Raphidascaris (Sprentascaris) (Nematoda: Anisakidae) in Rineloricaria steinbachi (Actinopterygii: Loricariidae) from Northwest Argentina

During a parasitological survey, we reported specimens of a new species of Raphidascaris (Sprentascaris) in Rineloricaria steinbachi from La Caldera River, province of Salta, Northwest Argentina. The new species, R. (S.) saltaensis sp. nov., is characterized by possessing 16 pairs of preanal papillae, lips with lateral protrusions and membranous elevations, and mature eggs rough-shelled with striations. This is the sixth species of the genus described in the Neotropical Region, and the second from Argentina. Rineloricaria steinbachi is reported as host of this nematode genus for the first time. A key to the species of Raphidascaris (Sprentascaris) in the Neotropical realm is provided. Also, zoogeographical and host information of the species, belonging to the subgenus Sprentascaris, is summarized.Fil: Ailan Choke, Lorena Gisela. Universidad Nacional de Salta. Facultad de Ciencias Naturales. Instituto para el Estudio de la Biodiversidad de Invertebrados; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Ramallo, Geraldine. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta; Argentina. Fundación Miguel Lillo. Dirección de Zoología. Instituto de Invertebrados; ArgentinaFil: Davies, Dora Ana. Universidad Nacional de Salta. Facultad de Ciencias Naturales. Instituto para el Estudio de la Biodiversidad de Invertebrados; Argentin

Further study on Procamallanus (Spirocamallanus) pintoi (Kohn et Fernandes, 1988) (Nematoda: Camallanidae) in Corydoras paleatus and Corydoras micracanthus (Siluriformes: Callichthyidae) from Salta, Argentina, with a key to congeneric species from Neotropical Realm

This study describes the morphology of Procamallanus (Spirocamallanus) pintoi (Kohn et Fernandes, 1988), isolated from the intestine of Corydoras micracanthus Regan, 1912 and C. paleatus (Jenyns, 1842) (both Callichthyidae, Siluriformes) from Bermejo and Juramento River basins, respectively, province of Salta, Argentina. This is the first record of P. (S.) pintoi in C. micracanthus from Northwestern Argentina. The light and scanning electron microscopy observations of P. (S.) pintoi, revealed a few previously unreported morphological details of the cephalic region, vulva and caudal region of males. In addition, morphometric variability was observed in, mainly body size, glandular oesophagus length and position of the vulva between present specimens and those described in previous studies. A key to the species of Procamallanus (Spirocamallanus) from the Neotropical Realm is proposed.Fil: Ailan Choke, Lorena Gisela. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta; Argentina. Universidad Nacional de Salta. Facultad de Ciencias Naturales. Instituto para el Estudio de la Biodiversidad de Invertebrados; ArgentinaFil: Ramallo, Geraldine. Fundación Miguel Lillo. Dirección de Zoología. Instituto de Invertebrados; ArgentinaFil: Davies, Dora Ana. Universidad Nacional de Salta. Facultad de Ciencias Naturales. Instituto para el Estudio de la Biodiversidad de Invertebrados; Argentin