Es descriuen un nou gènere i una nova espècie de mol·lusc valvatiforme estigobi de la família Hydrobiidae de la conca del riu Fluvià, a Catalunya, d’acord amb caràcters morfològics de la conquilla i peculiaritats de l’aparell reproductor masculí.A new genus and a new species of valvatiform stygobiotic mollusc of the family Hydrobiidae are described for the Fluvià River basin, in Catalonia, based on morphologic traits of the shells and peculiarities of the male reproductive syste

Alonso Suárez, Álvaro

López Soriano, Joaquín

Quiñonero Salgado, Sergio

Rolán-Alvarez, Emilio

English

Quiñonero-Salgado, Sergio

Repositori Institucional de la Universitat Jaume I

160 López-Soriano et al. Nemus 12 (2022) 160 - 167. Rebut el 04.04.2022, acceptat el 03.05.2022NEMUS revista de l’ateneu de naturaArticleA new genus and a new species of valvatiform stygobiotic mollusc of the family Hydrobiidae are described for the Fluvià River basin, in Catalonia, based on morphologic traits of the shells and peculiarities of the male reproductive system.Keywords: freshwater, biodiversity, stybobitic, Gastropoda, CataloniaUn nou gènere i una nova espècie d’hidròbid valvatiform del NE de la península IbèricaEs descriuen un nou gènere i una nova espècie de mol·lusc valvatiforme estigobi de la família Hydrobiidae de la conca del riu Fluvià, a Catalunya, d’acord amb caràcters morfològics de la conquilla i peculiaritats de l’aparell reproductor masculí.Paraules clau: aigua dolça, biodiversitat, estigobiont, gastròpodes, CatalunyaThe family Hydrobiidae Stimpson, 1865 is one of the most widespread and richest in species of all the inha-bitants of crenic and stygobiont systems. Among them, the valvatiform-shaped are a group of non-phylogene-tically related species, characterized by shells with a very depressed spire, in opposition to the trochiform shells, which have a much more elevated spire (Quiño-nero-Salgado & Rolán, 2017).In the Iberian Peninsula, there are different genera of Hydrobiidae with valvatiform representatives, such as: Islamia Radoman, 1973; Aretiana Delicado & Ramos, 2021; Tarraconia Ramos & Arconada, 2000; Boetersiella Arconada & Ramos, 2001; Chondrobasis Arconada & Ramos, 2001; Spathogyna Arconada & Ramos, 2002; Milesiana Arconada & Ramos, 2006; Josefus Arconada & Ramos, 2006; Iberohoratia Arconada, Delicado & Ramos, 2007; Corbellaria Callot-Girardi & Boeters, 2012; Navalis Quiñonero-Salgado & Rolán, 2017; Deganta Arconada & Ramos, 2019; and Salaeniella Boeters et al., 2019. Most of them have a very restricted geographical distribution range and a high level of endemicity. They are present in many places in the Iberian Peninsula, but few of them inhabit the north-eastern part, north of the Ebro River (Ramos et al., 2000; Arconada & Ramos, 2001, 2002, 2006; Callot-Girardi & Girardi, 2013; Quiñone-ro-Salgado & Rolán, 2017; Delicado et al., 2019).After different samplings in the Fluvià River basin (Catalonia, NE Iberian Peninsula), a new valvatiform species was found, which does not fit with any other genera described in the Iberian Peninsula. Genitalia analysis further confirms its differentiated status.Material and MethodsLocalities were visited between 2015 and 2018. Shells were separated from their substrates by sieving sedi-ments from the springs through mesh diameters of 2.60 and 0.56 mm. Shells were later dried, and examined under a stereomicroscope. Animals were preserved in 75 % ethanol for dissection. The dissections of the genital organs and measurements of the shells were A new genus and new species of valvatiform Hydrobiidae for the North-East Iberian PeninsulaJoaquín López-Soriano1*    , Sergio Quiñonero-Salgado1, Álvaro Alonso Suárez2, Emilio Rolán3 & Peter Glöer41. Associació Catalana de Malacologia, Museu Blau, Plaça Leonardo da Vinci 4-5, 08019 Barcelona, Spain.2. C/Infiesto 7 6ºJ, 33207 Gijón, Asturias, Spain.3. Museo de Historia Natural de la Universidad de Santiago, Campus Norte, Parque Vista Alegre, 15782. Santiago de Compostela, Spain.4. Schulstrasse 3, D-25491, Hetlingen, Germany.* Autor corresponsal: qlopezs@yahoo.com161A new genus and new species of valvatiform Hydrobiidae for the North-East Iberian Peninsula López-Soriano et al. Nemus 12 (2022) 160 - 167. Rebut el 04.04.2022, acceptat el 03.05.2022FIGURE 1. SEM pictures of Vilertia galeata gen. nov. sp. nov. A: Different views of the shell; B: Protoconch; C-D: Microsculpture of the protoconch; E: Operculum.Fotografies SEM de Vilertia galeata gen. nov. sp. nov. A: diferents vistes de la closca; B: protoconquilla; C-D: microescultura de la protoconquilla; E: opercle.AEDCB162López-Soriano et al. Nemus 12 (2022) 160 - 167carried out using a stereo microscope (Zeiss). Photo-graphs were made with a digital camera system (Leica R8).Abbreviations: MNHN = Muséum National d’Histoire Naturelle (Paris); p = penis; pl = penial lobe; w = wart; fp = faecal pellets: il = intestine loop; t = tentacle; fp = faeces pellets.SystematicsFamily HYDROBIIDAE Stimpson, 1865Genus Vilertia gen. nov.Type species: Vilertia galeata sp. nov.Description: The most evident characteristic that differentiates this new species from other known valvatiform species on the Iberian Peninsula is the reflexed outer lip, a characteristic which let us intro-duce a new genus for this new species. The umbilicus is deep and wide.Etymology: The name is a derivatio nominis referring to the village of Vilert, in the municipality of Esponellà (Pla de l’Estany, Girona province), where the first shells FIGURE 2. A: Holotype of Vilertia galeata gen. nov. sp. nov. B-D: Paratypes photographed under ethanol. Scale: 1 mm.A: holotip de Vilertia galeata gen. nov. sp. nov. B-D: paratips fotografiats sota etanol.  Escala: 1 mm.ADCB163A new genus and new species of valvatiform Hydrobiidae for the North-East Iberian Peninsula were found. Gender of genus is feminine.Remarks: Only known for the type species. See comparison with other genera and main characteris-tics thereafter.Vilertia galeata sp. nov.Fig. 1-3Type material: Holotype in MNHN Paris, #MNHN-IM-2000-38095. Paratypes: 2 shells in MNHN Paris, #MNHN-IM-2000-38096, 2 shells in PG coll., 10 shells in SQS coll.Type locality: Deu d’en Roure (=Deu d’en Costei), Esponellà (Pla de l’Estany, Girona province) located in the Fluvià River basin (Fig. 4 & 5) Coordinates: 31TDG82054700. 115 m a. s. l.Other localities: Font de Beu i Tapa, Vilert (Pla de l’Estany, Girona province), also in the Fluvià River basin. 31TDG85341691. 90 m a. s. l.Description: Small shell, with valvatiform shape, 0.51 - 0.74 mm in height and 0.96 - 1.13 mm diameter, with 3 whorls, deep sutures, and translucid coloration in freshly-collected specimens (Fig. 2, 3, 6). Protoconch microsculpture is formed by irregularly arranged microdepressions (Fig. 1C-D). Teleoconch showing growing lines. Deep and wide umbilicus, ovoid aper-ture, about 0.60 - 0.80 mm high and 0.51 - 0.66 mm wide, slightly oblique, and having a sharp peristome, slightly reflected towards the columella, and strongly towards the outer lip. Last whorl represents 90 % of total height. Corneum operculum, with orange to yellow coloration, convex in the inner side (see Fig. 1E, 3D).Animal: The animal is colorless, and the eyes are missing. The penis is broad and rounded at the tip with FIGURE 3. Vilertia galeata gen. nov. sp. nov. A: shell (paratype); B: male copulatory organ; C: intestinal loop; D-E: operculum (inner side). Scale: 1 mmVilertia galeata gen. nov. sp. nov. A: conquilla (paratip); B: òrgan copulador del mascle; C: gir intestinal; D-E: opercle (costat intern). Escala: 1mmADCB164López-Soriano et al. Nemus 12 (2022) 160 - 167a penial lobe of the same length (Fig. 3B). Intestine with one loop (Fig. 3C). Female sex tract with spherical bursa, receptaculum could not be found. Etymology: The specific name refers to the helmet-shape of the shell, resembling the M15 Adrian French model of World War I.Dimensions: The holotype is 1.05 mm in diameter and 0.68 mm in height. Paratypes range from 0.96 - 1.27 mm in diameter and 0.51 - 0.74 mm in height (see Table I).Habitat: Stygobiotic, all the shells were collected from sediments at the opening of the springs. Distribution: Only known from two different springs, very close to each other, in the margins of the Fluvià River.Differentiating characters: Vilertia gen. nov. differs from all valvatoid genera by the reflexed peris-tome. It differs from Rifia Ghamizi 2020 by the missing outgrowth at the operculum; from Fissuria Boeters, 1991, by the penis, which is papillose but without a penial lobe. In addition, Fissuria has two intestinal loops, while Vilertia gen. nov. has only one. TABLE 1. Shell measurement of the studied specimens, separated by the two populations. SH: shell height; SW: shell width; BWH: body whorl height; PH: aperture height; PW: aperture width.Mesures dels espècimens estudiats, separats per les dues poblacions. SH: alçada de la conquilla; SW: amplada de la conquilla; BWH: alçada de la darrera volta; PH: alçada de l‘obertura; PW: amplada de l‘obertura.SH SW BWH PH PWDeu d'en Roure (n=24)Type localityHOLOTYPE 0.68 1.05 0.61 0.46 0.48min 0.51 0.96 0.48 0.41 0.43max 0.74 1.27 0.67 0.54 0.55mean 0.64 1.12 0.56 0.47 0.50st.dev. 0.05 0.08 0.05 0.04 0.03Font de Beu i Tapa (n=3)min 0.63 1.17 0.56 0.52 0.54max 0.72 1.33 0.66 0.63 0.60mean 0.67 1.25 0.61 0.57 0.57st.dev. 0.05 0.08 0.05 0.06 0.03FIGURE 4. Map of Spain showing the localities where Vilertia galeata gen. nov. sp. nov. were found. A: Deu d’en Roure; B: Font de Beu i Tapa.Mapa d’Espanya mostrant les localitats on es va trobar Vilertia galeata gen. nov. sp. nov. A: deu d’en Roure; B: font de Beu i Tapa.AB165A new genus and new species of valvatiform Hydrobiidae for the North-East Iberian Peninsula Discussion: Valvatoid species are common in the western Mediterranean area, particularly in East Iberian Peninsula. Taking into consideration all the species in the coastal arch comprising southern France, Eastern Iberian Peninsula and down to north Morocco, the number of genera with valvatiform species increases to 13, 10 of which are monotypic. By restricting it to the Iberian Peninsula, these numbers are 10 and 7 respectively, more than all of the West Palaearctic. In addition, among them, only Islamia has more than two known species, thus showing the high degree of diversification within this group. The huge morphological differences among all these genera, along with the anatomical characters and the relative FIGURE 5. Vilertia galeata gen. nov. sp. nov. habitat. A-B: Deu d’en Roure; C: Font de Beu i Tapa. D-E: live specimens.Hàbitat de Vilertia galeata gen. nov. sp. nov. A-B: deu d’en Roure; C: font de Beu i Tapa. D-E: exemplars vius.AEDCB166López-Soriano et al. Nemus 12 (2022) 160 - 167isolation of the new population, permits the suggestion of a new genus until molecular data can either confirm or contradict this hypothesis. However, among the valvatiforms, only Tarraconia is represented in Cata-lonia (NE Iberian Peninsula), although it is found south of the Ebro River, and distant from the hydrographic basin of the newly described genus, which seems quite isolated from the other areas with presence of valva-tiforms. In this sense, the Ebro River seems to have worked as an important biogeographical barrier for Hydrobiidae valvatiforms, as it can be observed with another stygobiotic genus, Moitessieria Bourguignat, 1863, whose taxa are well represented northwards of this river, but barely southwards (Glöer, 2022). Regarding the genital anatomy, it is worth mentio-ning that only Islamia has a relatively similar, bilobu-lated penis, thus confirming the need for the assigna-tion of the new species to a new genus. The only genera with a flat shell and a bilobed penis are Rifia from Morocco, and Fissuria, which occurs in south of France, Italy and Greece. Whether the new species could actually be included in any of these genera should be resolved by molecular affinities as and when data becomes available.Habitat status and conservation: While the new species is present in the Fluvià River basin, which has a rather good ecological status, it is worth mentioning FIGURE 6. Vilertia galeata gen. nov. sp. nov. shell profile (left) and measurements from the different specimens studied (right). Aspecte de la conquilla de Vilertia galeata gen. nov. sp. nov. (esquerra) i mesures dels exemplars estudiats (dreta).that any damage to underground waters (overexploita-tion for different human or agricultural uses, contami-nation by farms, etc.) could pose an important risk for these populations. A permanent survey of the popula-tions and the quality of the habitats is highly desirable. A search for new populations of the species will be advisable too, in order to guarantee enough well-pre-served habitats where the species could be present.AcknowledgementsWe want to express our thanks to Vicenç Bros and Albert Orozco for comments that have improved the mansucript. Thanks to Inés Pazos of the Centro de Apoyo Científico y Tecnológico a la Investigación (CACTI) of the University of Vigo for help with SEM photographies.ReferencesArconada, B. & Ramos, M. A. 2001. New data on Hydrobiidae systema-tics: two new genera from the Iberian Peninsula. Journal of Natural History, 35: 949–984.Arconada, B. & Ramos, M. A. 2002. Spathogyna, a new genus for Valvata (? Tropidina) fezi Altimira, 1960 from eastern Spain: another case of pseudohermaphroditism in the Hydrobiidae (Gastropoda). Journal of Molluscan Studies, 68: 319–327.Arconada, B. & Ramos M.A. 2006. Revision of the genus Islamia Ra-doman, 1973 (Gastropoda, Caenogastropoda, Hydrobiidae), on the Iberian Peninsula and description of two new genera and three new species. Malacologia, 48 (1-2): 77–132.167A new genus and new species of valvatiform Hydrobiidae for the North-East Iberian Peninsula Callot-Girardi, H. & Boeters, H. D. 2012. Corbellaria celtiberica gen. et sp. nov. (Gastropoda: Hydrobiidae), mollusque valvatiforme stygo-bie de la province de Soria (Péninsule Ibérique). Spira, 4: 149–160.Callot-Girardi, H. & Girardi, M. 2013. Complément à l’étude de Corbellaria celtiberica et présentation d’espèces valvatiformes d’Espagne, de France, d’Italie et de Slovénie. Folia Conchyliologica, 21: 3–30.Delicado, D., Arconada, B., Aguado, A. & Ramos, M. A. 2019. Multi-locus phylogeny, species delimitation and biogeography of Iberian valvatiform springsnails (Caenogastropoda: Hydrobiidae), with the description of a new genus. Zoological Journal of the Linnean So-ciety, 186: 892–914.Delicado, D., Pešić, V. & Ramos, M. A. 2021. Arganiella Giusti & Pezzoli, 1980 (Caenogastropoda: Truncatelloidea: Hydrobiidae): a wides-pread genus or several narrow range endemic genera?  European Journal of Taxonomy, 750: 140–155.Glöer, P. 2022. The Freshwater Gastropods of the West-Palaearctis. Vo-lume II. P. Glöer ed., Hetlingen, 399p.Quiñonero-Salgado, S. & Rolán, E. 2017. Navalis perforatus a new genus and new species (Gastropoda, Hydrobiidae) from Spain. Ne-mus, 7: 7–11.Ramos, M.A, Arconada, B. Moreno, D. & Rolán, E. 2000. A new genus and a new species of Hydrobiid snail (Mollusca: Gastropoda: Hydro-biidae) from eastern Spain. Malacologia, 42: 75–101.

Un nou gènere i una nova espècie d’hidròbid valvatiform del NE de la península Ibèrica

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Un nou gènere i una nova espècie d’hidròbid valvatiform del NE de la península Ibèrica

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