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Redescription De Flabellina Ischitana

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Redescription De Flabellina Ischitana REDESCRIPTION DE FLABELLINA ISCHITANA (GASTROPODA, NUDIBRANCHIA) OBSERVÉ EN MER DE BANYULS : UNE NOUVELLE LOCALITÉ Redescription of Flabellina ischitana (Gastropoda, Nudibranchia) observed in the Banyuls sea : a new locality G Parent To cite this version: G Parent. REDESCRIPTION DE FLABELLINA ISCHITANA (GASTROPODA, NUDI- BRANCHIA) OBSERVÉ EN MER DE BANYULS : UNE NOUVELLE LOCALITÉ Redescription of Flabellina ischitana (Gastropoda, Nudibranchia) observed in the Banyuls sea : a new locality. Vie et Milieu / Life & Environment, Observatoire Océanologique - Laboratoire Arago, 1994, pp.211-214. hal-03048007 HAL Id: hal-03048007 https://hal.sorbonne-universite.fr/hal-03048007 Submitted on 9 Dec 2020 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. VIE MILIEU, 1994, 44 (3/4) : 211-214 REDESCRIPTION DE FLABELLINA ISCHITANA (GASTROPODA, NUDIBRANCHIA) OBSERVÉ EN MER DE BANYULS : UNE NOUVELLE LOCALITÉ Redescription of Flabellina ischitana (Gastropoda, Nudibranchia) observed in the Banyuls sea : a new locality G. PARENT Réserve Naturelle Marine Cerbère-Banyuls, France AEOLIDIEN POURPRE RÉSUMÉ - Un nouvel Aéolidien mauve, autre que Flabellina affinis (Gmelin, FLABELLINA ISCHITANA 1791) et Coryphella pedata (Montagu, 1815), a été observé dans la Réserve Na- BANYULS-SUR-MER turelle Marine Cerbère-Banyuls (F-66650). Nous pensons qu'il s'agit de Flabellina EUDENDRWM RAMOSUM ischitana identifié par Hirano & Thompson (1990) près de l'île d'Ischia (Italie) et nous pouvons considérer Banyuls-sur-Mer comme nouvelle localité pour ce Mol- lusque. Nous incluons une brève redescription et une photographie couleur du spé- cimen de 12 mm. PURPLE AEOLIDACEAN ABSTRACT - A new purple aeodacean which differs from Flabellina affinis FLABELLINA ISCHITANA (Gmelin, 1791) and Coryphella pedata (Montagu, 1815), has been observed in BANYULS-SUR-MER Banyuls-sur-Mer (F-66650). We think that concern Flabellina ischitana Hirano & EUDENDRWM RAMOSUM Thompson, 1990 occurring near the island of Ischia (Italy) and we consider Ba- nyuls-sur-Mer as a new locality ; a short redescription is presented with a color picture. INTRODUCTION Le premier -12 mm - a été photographié in situ et laissé sur place, le deuxième - 10 mm - a été prélevé, gardé dans du formol salé et étudié sous Dans la Réserve Naturelle Marine Cerbère-Ba- la loupe. nyuls (F-66650) - 42° 28' 9" N, 3° 8' 1" E - der- rière l'Observatoire Océanologique (Fig. 1), à l'île Grosse, sur un petit tombant orienté plein sud Caractéristiques du spécimen de 10 mm (Tabl. I) et par un fond de 6 m, nous avons trouvé en juillet 1992 deux Aéolidiens de couleur mauve à pourpre Corps : violet-mauve (pl. I) aux papilles orangées qui n'étaient ni Flabellina affinis (Gmelin, 1791) ni Coryphella pedata Palpes : de couleur mauve, extrémités blanches (Montagu, 1815). Hirano & Thompson (1990) dé- et mesurant approximativement 1/4 de la longueur crient un Aéolidien mauve - Flabellina ischitana du corps. - trouvé près de l'île d'Ischia en Italie. Nous pen- Angles du pied : courts et tentaculiformes. sons que les Mollusques trouvés à Banyuls-sur- Rhinophores : ils mesurent approximativement Mer correspondent à l'espèce trouvée en Italie. 1/5 de la longueur du corps. Ils sont de couleur pourpre à extrémités blanches, portent 16 la- melles, le «bouton terminal» est violet. MATERIEL Papilles : elles sont sur les pédoncules, qui peu- vent être ramifiés. Le tégument des papilles est translucide, non violet. L'appareil digestif moyen Les deux spécimens furent trouvés sur l'Hy- est de couleur orangée. Le cnidosac est blanc. draire Eudendrium ramosum (Linnaeus) - les Hy- Le spécimen examiné n'avait pas de première draires sont les principales sources alimentaires touffe post-péricardique droite, mais une excrois- des Aéolidiens. sance filiforme à base large, d'environ 4 mm, 212 G. PARENT Tabl. I. - Disposition des papilles sur un exemplaire de 10 mm. / / RANGÉE PÉDONCULES / PAPILLES DROITE RAMIFICATIONS / 1 ère touffe céphalique sup. : 2 grandes pédonculée ou moy. : 2 gdes, 1 petite 3 ramifications pré-péricardique inf. : 4 gdes, 1 petite 1 ère touffe post-péri- excroissance filiforme aucune papille cardique 2 ème touffe post-péri- pédonculée sup. : 2 grandes cardique 2 ramifications inf. : 2 gdes, 1 petite 3 ème touffe post-péri- sup. : 2 grandes pédonculée cardique inf. : 2 gdes, 1 moy., 1 2 ramifications petite 4 ème touffe post-péri- 2 grandes, 1 petite cardique 1 ramification 5 ème touffe post-péri- 2 moyennes cardique 1 ramification 6 ème touffe post-péri- 1 moyenne cardique 1 ramification 7 ème touffe post-péri- 1 ramification 1 moyenne cardique £3 RANGÉE PÉDONCULES PAPILLES GAUCHE RAMIFICATIONS 1 ère touffe céphalique identique disposition identique ou à celle à celle de droite pré-péricardique de droite sup. : 2 gdes, 1 moy. 1 ère touffe post-péri- pédonculée moy. : 2 grandes 3 ramifications cardique inf. : 2 gdes, 1 petite sup. : 2 grandes 2 ème touffe post-péri- pédonculée moy. : 1 gde, 1 moy. 3 ramifications cardique inf. : 1 gde, 1 moy. 3 ème touffe post-péri- pédonculée sup. : 2 grandes 2 ramifications inf. : 2 grandes, 1 petite cardique 4 ème touffe post-péri- 1 grande, 2 moyenne Fig. 1. - Schéma du site de prélèvement; cardique 1 ramification 5 ème touffe post-péri- : limite de la zone émergée ; 1 ramification 2 moyennes cardique : limite de la zone immergée ; 6 ème touffe post-péri- cardique 1 ramification 1 moyenne : limite de la Réserve Naturelle Marine Cerbère- 7 ème touffe post-péri- 1 ramification 1 moyenne Banyuls. cardique La flèche indique l'endroit où furent trouvés les deux spécimens de Flabellina ischitana. pouvant faire penser à une malformation ou à la repousse anormale d'un pédoncule arraché, mais en aucun cas à une papille car aucune ramification CONCLUSION de l'appareil digestif moyen ne se trouvait à l'in- térieur. Organes génitaux externes : ils se situent à la Dans cette zone de protection qu'est la Réserve limite antérieure du premier pédoncule droit. Naturelle Marine Cerbère-Banyuls, la richesse des fonds et des eaux ne peuvent être que des facteurs Le pénis globuleux, montre une extrémité essentiels à l'observation et à la découverte courte et ne possède pas d'épine péniale. d'animaux jusqu'ici ignorés, et nous pouvons Le schéma de la disposition interne des organes considérer la Réserve Naturelle Marine Cerbère- mâle et femelle de la publication originale (Hirano Banyuls comme nouvelle et première localité fran- et Thompson, 1990) est assez précis pour ne pas çaise pour cet Aéolidien et supposer Eudendrium être représenté à nouveau. ramosum comme nourriture additionnelle à E. glo- La prostate s'enroule à la base du premier pé- meratum et E. racemosum.. doncule droit. L'adjonction de photographies - couleur lors- Anus : l'orifice anal forme une petite protubé- que cela est possible - avec des rapports de rance et s'abouche latéro-dorsalement un peu en grossissement adaptés aux petites espèces, entre avant du deuxième pédoncule droit. pour une grande part dans l'identification ex- Radula : la radula trisériée d'un spécimen de terne des animaux, évitant ainsi les synonymie 10 mm a pour formule : 13 x 1.1.1. de spécimens déjà identifiés, et que leur passage plus ou moins prolongé dans un liquide conser- La médiane est à cuspide centrale et porte vateur a souvent rendu méconnaissable. L'étude 7 denticules latéraux. interne ne peut en aucun cas être discutée et re- La latérale est en forme d'aiguille pointue et lisse. mise en cause. FLABELLINA ISCHIATANA (GASTROPODA NUDIBRANCHIA) 213 Pl. I. - Flabellina ischitana, exemplaire de 12 mm in situ. 214 G. PARENT REMERCIEMENTS - Cette publication a été réalisée GARCIA J.C., 1984. A new species of Flabellina (Gas- dans le cadre du programme NAT-MAR. Mes re- tropoda, Nudibranchia) from the Gibraltar Strait merciements au Dr. F. Athias-Binche, responsable (southern Spain). Vie et Milieu 34 : 61-64. scientifique du programme NATMAR, Directeur GARCIA J.C., 1986. El genero Flabellina Voigt, 1834 de recherche au CNRS, Observatoire Océanologi- (Gastropoda, Nudibranchia) en el litoral ibérico. Bol. que de Banyuls Laboratoire Arago, Université Malac. Milano 22 : 37-48. Pierre et Marie Curie/URA CNRS 117, Banyuls-sur- HIRANO Y.J. & T.E. THOMPSON, 1990. Flabellinid Mer, et à J.-L. Binche, Directeur de la Réserve Natu- Nudibranchs from the Bay of Naples, with a des- relle Marine Cerbère-Banyuls, pour ses conseils, cription of a new species, Flabellina ischitana. The ses encouragements, son aide et son amitié. Malacological Society of London. /. Moll. Stud. 56 : 345-354. PRUVOT-FOL A., 1954. Faune de France : Mollusques Opisthobranches 58 : 1-460. BIBLIOGRAPHIE SCHMEKEL L. & A. PORTMANN, 1982. Opisthobran- chia des Mittelmeeres, Nudibranchia und Saccoglos- sa. Berlin, Springer-Verlag : 1-410. CATTANEA-VIETTI R., R. CHEMELLO, & R. GIAN- NUZZI-SAVELLI, 1990. Atlas of Mediterranean Nu- Reçu le 28 juillet 1993 ; received July 28, 1993 dibranchs. La Conchiglia : 1-268. Accepté le 18 février 1994; accepted February 18, 1994 .
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