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Des Pyrénées Ariégeoises Alain BERTRAND Documents Malacologiques 2 (2001) : 39-41. Moitessieriajontsaintei sp. nov. (Gastropoda : Prosobranchia : Moitessieriidae) des Pyrénées ariégeoises Alain BERTRAND * INTRODUCTION Le genre Moitessieria possède une aire de répartition essentiellement ouest méditerranéenne. BOETERS (1998) considère que les taxons des bassins de la Seine et de la Saône appartiennent au sous-genre genre SpiraUx (BoETERs, 1972). Dans les Pyrénées, le genre Moitessieria compte six taxons décrits (BERNASCONI, 1994, BOETERS et BERTRAND, 2001). Ce sont: Moitessieria nezi BOETERS et BERTRAND 2001 ; Moitessieria lescherae BOETERS 1981 ; Moitessieria juvenisanguis BOETERS & GITTENBERGER 1980; Moitessieria simoniana (SAINT-SIMON 1848); Moitessieria olleri ALTIMlRA 1960; Moitessieria massoti BOURGUIGNAT 1863, auxquelles s'ajoute au moins un taxon inédit du Pays Basque français (BERTRAND, en prép.). La répartition des espèces est encore mal documentée, mais tous les bassins des grands fleuves Adour, Garonne, Aude, Berre, Agly et Têt possède une ou plusieurs espèces. Seuls de petits fleuves côtiers du Pays Basque ou des Pyrénées Orientales ne semblent pas posséder d'espèce du genre (BERNASCONI, 1994; BERTRAND, 1995, 1996, 1997; BERTRAND et al. 1999). Toutes les espèces connus du genre sont souterraines et peuplent les eaux karstiques, les nappes alluviales et le milieu hyporhéique. DESCRIPTION Holotype: Muséum National d'Histoire Naturelle, Paris; Paratypes: 9 exemplaires Muséum National d'Histoire Naturelle, Paris; 5 exemplaires collection Henri GIRARDI; 15 exemplaires collection Alain BERTRAND; Source de Font-Sainte, Ustou, Ariège VIII-1996. Autre matériel examiné: 5 exemplaires, résurgence de Borde de Crue, Seix, Ariège, 1200 m; V-1998 ; > 100 exemplaires Source de la chapelle de Bincarède, Ustou VII. 1995, VIII-1998. Diagnose (Figures 1 et 2 ; tableau 1) • Coquille. Sub conique; 1,6-2,0 mm x 0,75-0,90 mm ; spire composée 5-6 Yz tours convexes le dernier occupant environ la moitié de la hauteur totale: M = 51,Il % (45,00 - 55,88 %; n = 30); suture bien marquée; péristome plus ou moins évasé et épaissie; ouverture formant dans la partie un sinus plus ou moins marqué. Micro sculpture composée de strie longitudinale et de sillons spiraux peu développés et formant une réticulation quadrangulaire peu profonde sauf sur la protoconche où la micro sculpture est faite de «stries spirales)} composées de petites « papilles)} très caractéristiques. • Anatomie. Inconnue. • Répartition. Outre la station type M fontsaintei est connu de la source de la chapelle de la Bincarède et de la résurgence de Borde de Crue, commune de Seix, Ariège. • Derivatio nomminis : de Font-Sainte toponyme de la station type (Bincarède, Ustou, Ariège). Enfin, Henri GIRARDI, possède un exemplaire unique attribuable à cette espèce collecté dans des sédiments du ruisseau de L'Exergue, Porté-Puymorens, Pyrénées-Orientales, 1800 m (Déc. 1999, C. Bomba, leg.); les recherches ultérieures menées sur cette station n'ont toujours pas permis de collecter d'autre spécimens. • Laboratoire Souterrain, CNRS, 09200 MOULIS 39 Bertrand, Moitessieriafontsaintei sp. Nol'. A B c D F G Figure 1 : Moi/essieriafon/sain/ei sp. nov. Source de Font-Sainte, Ustou Ariège. Tableau 1 : Biométrie de Moi/essierla fon/sain/ei nov. sp. (N =30) L: bauteur de la coquille; D: diamètre; Dt : bauteur du dernier tour. L D Dt LID Moyenne 1.831 0.823 0.934 0.223 Ecart type 0.099 0.034 0.046 0.014 Mini 1.600 0.750 0.850 0.200 Maxi 2.000 0.900 1.00 0.250 40 Documents Malacologiques 2 (2001) 1.00 0.90 0.80 + -s;W0 0.70 .... ~ 0.60 •._-f + E 0.60 + i5 0.40 0.30 0.20 0.10 0.00 0.00 0.60 1.00 1.60 2.00 2.60 Hauteur I+M. simon/ana OMo fontsa/ntetl Figure 2: Biométrie comparée de M. fonlsa/nlei (Font Sainte, Ustou) et de M. simoniana (alluvions du Douctouyre, Dun, Ariège). DISCUSSION-CONCLUSION M fonsaintei est, au moins conchyliologiquement proche de M simoniana dont il n'est peut être qu'une forme d'altitude; toutefois, la forme et la taille de la coquille, sa biométrie (figure 2 et tableaux 1 et II), la micro sculpture de la protoconche et son écologie en font une forme particulière, même si son statut taxonomique reste incertain. Tableau II Biométrie de Moilessieria simoniana (SAINT-SIMON t848) (N = 30). Alluvions du Douctouyre, Dun Ariège. L: bauteur de la coquille; 0 : diamètre; Dt : bauteur du dernier tour. L D Dt un Moyenne 1.7642 0.5883 0.7625 2.47 Ecart type 0.2226 0.0814 0.0873 1.14 Mini 1.4 0.45 0.6 0.02 Maxi 2.25 0.85 1 3.55 Dans l'état des connaissance, il n'est pas connu d'accès au milieu aquatique souterrain sauf à la grotte de Borde de Crue. Celle-ci n'a pas encore été visitée. Dans le Massif de Mont Vallier où est située cette dernière grotte existe de vastes karsts d'altitude (1500-2300 m) qui n'ont jamais fait l'objet de prospections malacologiques. Les quelques données disponibles sur les invertébrés, en particulier les insectes Carabidae et Catopidae, montrent tout l'intérêt de cette zone où le micro-endémisme est très important chez les formes souterraines notamment. BIBLIOGRAPHIE BERNASCONI, R. 1994 Le genre Moi/essieria BERTRAND, A 1996 Note sur la répartition de Bourguignat, 1863 en France: révision, inventaire quelques Hydrobiidae souterrains dans le sud de la et description de M. corsica n. sp. (Mollusca : France (Mollusca, Gastropoda, Prosobrancbia, Gastropoda : Prosobrancbia : Hydrobiidae). Hydrobiidae). Mémoires de Biospéologie, 23, p. Mémoires de Biospéologie, 21, p. 7-20. 261-262. BERTRAND, A 1995 Moitessieria lescherae BERTRAND A. (\997) - Notes sur la répartition des (Boeters, 1981) (Mollusca : Prosobrancbia : Hydrobiidae (Mollusca, Gastropoda, Proso­ Hydrobiidae) dans les Hautes-Pyrénées. Vertigo, 5, brancbia) dans le Sud-Ouest de la France. p.28-29. Mémoires de Biospéologie, 24 : 209-216. 41 • Bertrand, Moilessieria fontsointei sp. Nov. BERTRAND, A., RIPPERT, M. et VIAL, E. 1999 Moitessieriidae und Hydrobiidae in Spanien und Notes sur la répartition des Hydrobiidae (Mollusca, Portugal. Arch. Moll., 118 : 181-261. Gastropoda, Prosobranchia) dans le sud de la BOETERS, H.D. 1998 Mollusca : Gastropoda : France et en Catalogne). Mémoires de Biospéo­ Rissoidea. Subwasserfauna von Mitteleuropa 5/1-2. logie, 26: 139-145 Stuttgart, 76 p. BODON. M. et GIUSTI, F. 1991 The genus BOETERS, RD. et BERTRAND, A. 2001 A Moitessieria in the island of Sardinia and Italy. remarkably rich prosobranch fauna endemic to the New data on the systematic of Moitessieria and French Pyrénées" Basteria, 65 : 1-15. Paladilhia (Prosobranchia: Hydrobiidae) (Studies BOETERS, H. D. et GITTENBERGER, E. 1980 on the Sardinian and Corsican Malacofauna IX). Unbekannte westeuroparsche Prosobranchia, 4. Malacologia, 33, p. 1·30. Basteria, 44, p. 65·68. BOETERS, H. 1988 Westeuroparsche Moites­ sieriidae, 2) und Westeuroparsche Hydrobiidae, 7). 42.
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