The female of Acusicola pellonidis n. sp. (Copepoda : Cyclopidea) is described from the gills of an Amazonian fish, Pellona castelnaeana (VALENCIENNES). The new species is distinguished from all others known for the genus by its larger size, longer antennae, sparse pigmentation and by the presence of a Y-shaped reinforcing structure in the dorsal wall of the cephalothorax. Keywords : parasitism, Crustaceans, fishes, Amazo

Boeger, W.

Thatcher, V.

English

MPG.PuRe

The parasitic Crustaceans of fishes from the Brazilian AmazonlO -Acusicola pellonidis n. sp. (Copepoda : Cyclopidea) fromP e llo n ø c a s t e ln ø e anø (VALENCIENNES)byVernon E. Thatcher and Walter A. BoegerInstituto Nacional de Pesquisas da Amazônia, Manaus - Amazonæ, BrazilAbstractThe female of Acusicola pellonidis n. sp. (Copepoda : Cyclopidea) is described fromthe gills of an Amazonianfish,Pellona castelnaeanø (VALENCIENNES). The new speciesis distinguished from all others known for the genus by its larger size, longer antennàe,sparse pigmentation and by the presence of a Y-shaped reinforcing structure in the dorsalwall of the cephalothorax.Keywo rds : parasitism, Crustaceans, fishes, A mazonIntroductíonThe genusAcusicola (Ergasilidae) was proposed by cRESSEy (r970;in cREssEy& COLLETTE 1970). Although this genus was rejected by JOHNSON & RocERs (1972)and by KABATA (1979),it was reinstated and emended by THATCFIER (1984).Acusicotapresently contains the following species: A. tenax (ROBERTS 1965) from Texas as type;A. cunuln cREssEY, 1970, from Patâ,Braùl; A. tucunarense THATCHBR, 1984, fromManaus, Amazonas, BrazllandA. lycengraulidis THATCFIER & BOEGER, 19g4, fromManaus, Amazonas, Brazil. A new species of this genus is herein described which representsthe fourth'known from the Brazilian Amazon.0065-6755 I L963 I 2'73 | @ MPI fi¡r Limnologie, AG Tropenökologie, plön; INpA, Manaus273Material and MethodsLiving ergasilids were collected by severing the gill filaments to which they were attached. Theywere then killed by imersing the filaments in 70 % alcohol and afterwa¡ds removed by dissection. Themethods used in their prepæation and study were those explained in TIIATCFIER (1981) and inTH¡.TCI-IER & ROBERTSON (1982). Color determinations were made with reference to SMITHE(1974). Drawings were made with the aid of a camera lucida and measurements with an ocul¿r micro-meter. All measurements are given in micrometers.Systematic Sec{ionErgasilidae NORDMANN, 1832Acusicolinae THATCffiR, I 984A cusicolø CRESSEY, 1970Acusicola pelbnidis n, sp.(Fies. 1 - 13)Host:Site:I¡cality:Male:Holotype (female)Pe llona ca st eln øeanø (VA LEN CIENNES ) ; Clupeidae.Gill filaments.Amazon Rive¡ near Manaus, Amazonas, Brazil,Unknown.Instituto Nacional de Pesquisas da Amazônia (INPA),Manaus, Amazonas, Brazil, No. PA-238-1,INPA and Museu de Zoologia da Universidade de São Paulo,São Paulo, S, P., Brazil,The specific name of the parasite was fo¡med from the generic name of the hostfish,Paratypes:EtymologySpecies diagnosis (based on 18 specimens studied and L0 measured; Tables I and II): Cephalo-tholax ovoid, tapedng anteriorly and posteriorly; internal Y-shaped chitinous ridge for muscle attach-ment prcsent (FtC. 1). Eyespot diffuse; of cobalt blue granules (Color 68 of SMITFIE L974). Cobaltbody pigmentation ventrally located, widely scattered; p8ment dist¡ibution indicated by dark aré¿s inFþs. 1, 3, 6,7,6,9,10 and 11.Antennae (Flgs. 2, 3 and 7; Table II). Antennule of five segments (Frg. 7); bearing simple setae;setalformula = 8 - 4 - 4'3 -7;total= 26. P¡ehensile antenna four-segmented (Irig. 3); second segmentelongate, nearly as lorry as other thtee segments combined, Third segment with prominent groove aboutmidway on its length which serves to receive the fourth segment (claw) ofopposite antenna when thesea¡e latched, CIaw small, slightly curved.Thorax (including genital segment) of five free segments (Flg. 1). Segments 2 - 5 bearing swim-ming legs; segment 6 with vestigial Sth legs. Genital segment subspherical (Ftg. 6).Abdomen (Fig. 6) threp*egmented; third segment about as long as other two combined. Eachuropod with one long, one mèdium and one short seta.Mouthparts (Ir8. 13). Mandible bifid; longer portion with stylet-like bristles: palp serateposteriorly: maxillule not observed: maxilla with prominent terminal teeth and anterior bristles.Legs (Figs, 8 - 12;Table III). læg 1 (FB. s); endopod two-sçgmented, exgpod three-segmented:first endopodal segment laterally bristled and with one plumose meàid seta; secoìd endopodãl segmentlatenlly bristled and with twQ stout terminal spines and five small plumose setae medially: first eiopcidalsegment with few medial hairs and one small postero-lateral spine; iecond segment with a single plumoseseta medially; third segment with two thin postero-laieral spines and five pl¡rmose setae. Iæg 2 (FrC. 9)with both rami three'segmented: first endopodal segment sparsely pilose latèrally and úith one plumoseseta medially; second segment with few hairs laterally and two plumose setae medially; third segmentwith few hairs laterally, a slender te¡minal spine and four plumose setae medially: first exopodal segment274Table 1: Measurements (¡¿m) of 10 adult females of Acusicola pellonidis n. sp.Body (less caudal setae)CephalothoraxFree thoracic segmentsIIIIVVIVIIAbdominal segmentsIIIIIIUropodCaudal setaeEgg sacAntennâ I (antennule)Antenna II (prehensile)Segment 1234Lengtht,02s -1.,27 5 (t,126)s7s- 670( 623)( 119)( 90)( 77)( 2s)( 83)13 -13 -30-40-140 -625 -18 ( 16)18 ( 1s)3s ( 31)s0 ( 44)190 ( 167)830 ( 72r)Length160 - 180 (163)1s0 - 170 (16s)320 - 370 (356)120 - 180 (16s)50- 7s( 68)width300 - 42s (389)300 - 42s (389)2s0 -280 (26s)180 - 210 (f98)t20 - r40 (1,32)70- 8s(77)98 - 11s (10s)140100903088110 -70-70-20-80-636358II .5| -40'- 668 ( 6s)6s ( 64)68 ( 63)28 ( 26)0-1,0-1,0 - 1,0-52370- 80( 73)Table 2: Antennal measurements (pm) of 10 adult females of Acusicola pellonidis n, sp.Table 3 : Relationships of spines to setae on the legs of Acusicola pelbnidis n, sp.I-0,I-0,I -0,0-0,275width30 - 40 (37)60 -90 (72)60 -90 ('12)30 - 40 (34)1s - 20 (17)ExopodEndopodw44J12J40 - 1,0-1,0-1,0-1,il-50 -2,0-2,0 -2,with one small postero-lateral spine; second segment with one plumose seta medially; terminal segmentwith one spinule and six plumose setae. Iæg , 6tg. 10) with both rami three-segmented: first endopodalsebment with one plumose seta medially and few hairs laterally; second segment sparsely pilose laterallyand with two plumose setae medially; third segment with few hairs laterally and with one slender spineand four plumose setae;first exopodal segment with one. small spine postero-laterally; second segmentwith one plumose seta medially; terminal segment with six plumose setae. Leg ¿ G'ig. f t) with th¡ee-segmented endopod and two-segmented exopod: first endopodal segment sparsely pilose laterally andwith one plumose seta medially; second segment with few hairs laterally and two plumose setae medi-ally; third segment with few hairs laterally and with one terminal spine and ttuee plumose setae.fi¡stexopodal segment pectinatg laterally but without spines or setae; terminal segment pectinate latefallyand with five plumose setae. Leg 5 Glg. 12) reduced to two small simple setae.Egg sac @þ. 4) elongate, with 30 - 90 small spherical eggs.THATCHER, V. E, (l 984): The parasitic crustaceans of fishes from the Brazilian Amazon. 7 , Acusicolatucunørense n, sp: (Copepoda : Cyclopidea) fuom Cichln oceilarts, with an emendation of thegenus ald the proposal of Acusicolinae subfam, nov.- Rev. B¡asil. Biol. (in press).THATCffiR, V. E. &, B. A. ROBERTSON (1982): The parasitic crustaceans of fishes from the Brazilían' Amazon. 3. Ergasílus jaraquensis n. sp. (Copepoda : Cyclopoidea) from the gills of Sernaprochilo-' dus insignis (SCHOMBURGK).- Rev. Brasil. BioL 42: 515 - 5t9.Authors' addresses:Dr. Vernon E. ThatcherM. Sc. Walter A. BoegerInstituto Nacional de Pesquisas da Amazônia(INPA)IctiopatologiaCaixa Postal 47869000 Manaus/AmazonasBrazi|Accepted for publication in August 1983DiscussionOfthe five species presently known in thisgenus,.4 cusicola peltonidis n. sp. is the largest (1,0251,275 mic¡ometers). The sizes for the other species are: A. tenax,'132 - Bi4;A. cunula,652;A, tucuna-rense,720 -970;andA. lycengrøulidis,800 - 950. Since the new species is larger, all measurements arecorrespondingly greater, however, the second antennal segment of A, peltonidis n. sp, is relatively muchlonger (320 - 370). The longest second antennal segment among the other species is that of ,4. tucuna-rense wtichteaches a maximum of 300 micrometers. All foru of these Amazonian species have arelatively simple antennal l¿tch (Flg. 2). This character serves to distinguish them from.4, tenax inwhich the l¿tch is mo¡e complex and the claws are sharply curved. A, pellonidis n. sp. is also the specieswith the fewest pþment granules, and the only one wíth a Y-shaped ráinforcement in the dorsal wall ofthe cephalothorax.ResumoA fêmea de Acusicola pellonidis n. sp. (Copepoda : Cyclopidea) é descrita das brânquias de umpeixe amazônico, Pellono castelnaeana (VALENCIENNES), A nova espécie distingue-se das demaisespécies conhecidas no gênero pelo,seu tamanho maior, suas antenas mais compridas, sua pigmentaçãoesparsâ e pela presença de uma estrutura especial em forma de "Y" na parede dorsal do cefalotorax.ReferenæsCRESSEY' R. F. & B. B. COLLETTE (19?0): Copepods and needlefishes: Ä study in host-parasiterelationships,- Fish. Bull. Nat. Ocean. & Atmos. Admin. 68: 34,1 - 432.JoHNsoN, s. K. & w. A. ROGERS (1972): Ergasitus clupeidarum sp. n. (copepoda : cyclopoida) fromclupeid fishes of the Southeastern U. S, with a synopsis of the North A merrc,an Eryasilus species' with a two-jointed first endopod.- J. Parasit. 58: 385 - 392,KABATA, z. (1979): Parasitic copepoda of British Fishes.- The Ray society. l¡ndon: 46g pp., 2,031Flgs.SMITffi, F' B. (1974): Naturalist's Color Guide and Supplement.-Amer. Mus. Nat. Hist, New york, N, y.229 pp., Colors 1 - 86.TIIATCHER, V. E. (198i): Os crustáceos parasitos de peixes da Amazônia brasileira. 1, Ergasilusbryconis n' sp. (Copepoda : Cyclopoidea) da matrinchã (Brycon melanopterus (COpE)).- ActaAmazônica ll: 439 - 444.276 277too24,50.,Plate 1:Acusicolø peltonídis n. sp. (female).Fig. l.: Dorsalview;Fþ,2: Latched antennae;Fþ, 3: Antenna;Fig.4: Egg sac;Fig. 5: Uropod, ventral view; Flg. 6: Genital segment, abdomen and uropods;Fþ. 7: Antennule (scale in ¡rm),(¡oo6-]537278 2799Iooto ilþr3t2Plate 2:,Acusícola pellonidis n. sp. (female),Fig.8: Leg 1;Fig.9: Leg2;Ftg. 10: Leg 3;Fig. l1:Leg4;Fig. 12:Lqg5;Fig. 13: Mouthparts (scale in ¡rm).

The parasitic crustaceans of fishes from the Brazilian Amazon. 10 - Acusicola pellonidis n.sp. (Copepoda: Cyclopidae) from Pellona castelnaeana (VALENCIENNES)

The parasitic crustaceans of fishes from the Brazilian Amazon. 10 - Acusicola pellonidis n.sp. (Copepoda: Cyclopidae) from Pellona castelnaeana (VALENCIENNES)

Abstract

Similar works

Full text

Available Versions

MPG.PuRe