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Una Nueva Especie De Piseinotecus Marcus, 1955

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Una Nueva Especie De Piseinotecus Marcus, 1955 Boll. Malacologico settembre-dicembre1986 Juan Lucas Cervera, José Carlos Garcia y Francisco José Garcia (*) UNA NUEVA ESPECIE DE PISEINOTECUSMARCUS, 1955 (GASTROPODA:NUDIBRANCHIA) DEL LITORAL IB'ERICO (**) PALABRASCLAVE: Gastropoda, Nudibranchia, Taxonornfa, Sur de Espafia, Piseinotecus. KEY WORDS:Gastropoda, Nudibranchia, Taxonorny, Southern Spain, Piseinotecus. Resumen: Se describe una nueva especiede Piseinotecidae,PiseinotelUs gaditanus, a partir de ejem- plares recolectadosen aguasdellitoral occidental andaluz (Sur de Espaiia). Sus caracteristicas esencialessan: Cuerpo bIanco hialino, alargado,con 6-7 grupos de ceras a cada Iado. Rin6fo- ros mas Iargos que 105tentaculos orales. Ceras con conspicuasmanchas superficiales blanco- opacasy gianduia digestiva de colar rojo oscuro. Laiormula radular es 21 xO.l.0 (ejemplar de 5 mm). Dientes con 1 denticulo centrar prominente y 5 denticulos mas pequeiios a cada Iado. Borde masticador de Ias mandibulas con 2 fllas de denticulos. La ampolla es de gran tamaiio y piriforme; ei receptaculo seminaI es alargado y la giandula gametolitica no presentauna forma bien definida. Riassunto: Descriviamo qui una nuova specie di Piseinotecidae, Pseinotecus gaditanus, partendo da alcuni esemplari raccolti nelle acque del litorale occidentale andaluso (Spagna meridionale). Le sue caratteristiche essenziali sono: Corpo bianco, diafano, allungato, con 6-7 gruppi di papille ad ogni lato. I rinofori sono più lunghi che i tentacoli orali. Le papille hanno cospicue mac- chie superficiali bianco opache e ghiandola digerente di colore rosso scuro. La formola radula- re è 21 x 0.1.0 (esemplare di 5 mm). Denti con 1 denticolo centrale prominente e 5 denticoli più piccoli ad ogni lato. Bordo lriasticatore delle mandibole con 2 file di denticoli. L'ampolla è piuttosto grande ed in forma di pera; il ricettacolo seminale è allungato mentre la ghiandola gametolitica non presenta una forma ben definita. Summary: A new speciesof Pisenotecidaefrom the western andalousiancoasts, Piseinotecus gadita. nus, is described. The body is white hyaline colour, with 6-7 groups of cerata in each side. The rhinophores afe longer than the ora! tentacles. The cerata display conspicuous opaque white spots and the hepatic ramifications afe dark-red colour. The radular formula is 21 x 0.1.0 (5 mm specimen).The teeth bave 1 prominent centra! denticle and 5 denticles sma!- ler than it on each side. The masticatory edges of the jaws bave 2 rows of denticles. The ampulla is large and pear.shaped.The seminaI receptacleis lengthned. The gametolitic gland do not display a well definite morphology. (*) Depto. Zoologia, Facultad de Biologia, Univo Sevilla, Apto. 1.095, Sevilla, Spain. (**) Lavoro accettato il 7 marzo 1986. 215 Introduccion: En un trabajo anterior (CERVERAy GARctA, en prensa) incluiamos pro- visionalmente los ejemplares que describimos aqui en el género Calmella ELIOT,1906 debido a la gran similitud de sus caracteres extemos con C. cavolini. En tal trabajo, se exponia la necesidad de realizar un estudio mas detallado que permitiera confirmar la pertenencia de nuestros ejem- plares al género Calmella o a otro muy pr6ximo a él, PiseinotecusMARCUS, 1955. La existencia de una radula uniseriada, permite, por tanto, atribuir- los a este ultimo. ORDEN Nudibranchia SUBORDENAeolidacea F AMILIA Piseinotecidae EDMUNDS, 1970 GENERO Piseinotecus MARCUS, 1955 Piseinotecus gaditanus n. sp. Material examinado: Céidiz,Sur de Espafia (36031' N; 60 17' W): 2 ejemplares de 9 y 7 mm (Diciembre, 1984); 2 ejemplares de 8 y 5 mm (Mayo, 1985); 1 ejemplar de 7 mm (Agosto, 1985). Todos los ejemplares fueron encontrados bajo pie- dra, en la zona intermareal. Anatomia externa: Cuerpo alargado. con 6-7 grupos de ceras a cada lado. £1 numero de ceras por grupo varia de 5 a 6 en los dos primeros pares de grupos a 1-2 en los posteriores. Los ceras de cada grupo se insertan en un pedunculo basaI comun que sobresale claramente por los lados del cuerpo. Los rino- foros, lisos, san mas largos que los tentaculos orales. Los tentaculos pro- podiales san cortos y ganchudos. £1 gonoporo se situa bajo el primer gru- po de ceras derecho. La localizacion del ano es tipicamente acleioprocta. Junto a éste se encuentra el poro renal. £1 pie es redondeado anterior- mente y puntiagudo en el extremo caudal. Coloraci6n: El cuerpo es bIanco hialino, con dos areas rojo-violaceas en la regi6n cefalica que corresponden a las mandibulas vistas por transparencia. Los rin6foros y tentaculos orales también san bIanco hialino si bien en su mi- tad apical poseen algunas manchas irregulares bIanco opaco. En los ce- ras, la glandula digestiva, bien visible por transparencia, es rojo oscuro (granate) el cual vira a castano bacia la base de cada cera. En la superfi- cie de éstos, aparecen abigarradas manchas bIanco opaco que contrastan llamativamente con la coloraci6n de la glandula digestiva. Tales manchas san muy densas y modifican ligeramente el liso perfil de los ceras, pues configuran pequenos abultamientos de superficie alga rugosa. El apice de los ceras es bIanco hialino. 216 Anatomia interna: La radula, uniseriada, tiene de f6rmula 21 x 0.1.0 para un ejemplar de 5 mm. Cada cliente rosee un denticulo centraI mas prominente q~e los denticulos laterales, de tamafio homogéneo y en numero de 5 a cada lado. La forma de las mandibulas se ilustra en la figura 5, A. El borde mastica- dor es relativamente pequefio. Cuando éste comienza en el fulcro rosee una sola fila de denticulos, pero poco después ésta se divide en doso La ampolla es piriforme, algo redondeada, y en ella la entrada del conducto hermafrodita y la salida del espermoviducto estan muy pr6xi- mas. El receptaculo seminaI, alargado, conecta por un corto conducto con la glandula gametolitica, de forma ésta no bien definida. La pr6stata es relativamente corta y gruesa. Muy pr6ximo a la zona de separaci6n del espermoviducto en el conducto deferente y el oviducto aparece ligado al primero un conducto (?) bien definido que va basta la pared del cuerpo. Habra de aguardarse al estudio de otros ejemplares antes de pronunciar- nos sobre la verdadera existencia de este conducto asi corno de su identi- dado Puesta: Obtenida una sola puesta en cautividad (Mayo, 1985).El cord6n ovi- gero es algo aplastado, de secci6n ovalada, aunque en algunos tramos lle- ga a ser circular. La longitud es de 5 mm y la anchura de 0'15 mm apro- ximadamente. Las capsulas, ovaladas, se disponen muy apretadamente y de forma desordenada.Su numero total aproximado es de 380 y cada una de ellas contiene un huevo (en estado de divisi6n en la mayor parte de los casos observados)de color bIanco y tono ligeramente amarillento. Holotipo: Holotipo depositado en las colecciones del Museo Nacional de Cien- cias Naturales de Madrid con numero de catalogo 12-114/1004. Origen del nombre: EI nombre especifico de gaditanus deriva dellatin Gades (= Cadiz) localidad tipo a la cualla dedicamos. Discusion: P. gaditanus es la unica especie del género que se ha descrito en las aguas ibéricas y atlanticas europeas. En la tabla I se recogen las caracteristicas diferenciales mas impor- tantes de nuestra especie con las demas especiesdescritas atribuidas al género Piseinotecus. Esencialmente, P. gaditanus se distingue de las de- mas especies conocidas de Piseinotecuspor la coloraci6n rojo oscura y manchas bIanco opacas de sus ceras, y por presentar 5 denticulos en am- bos lados de cada di ente radular. 217 'I \ '" \ '" Fig. 1 Vista dorsolateral de dos ejemplares. B Fig. 2 A. Vista ventral de la parte anterior del animai. 218 B. Detalle de la coloracion de un cera. ~ 1° x 3° 4° Fig. 3 Secuencia del 10 al 40 grupo de ceras mostrando la variabilidad en el numero y dispo. sicion de los ceras. I I 10um A 25JJm B Fif;.4 A. Vista lateral de varios dientes radulares. B. Vista dorsal de un cliente radular. 219 A ~; B 240Jlm :ig. 5 A. Mandibula. B. Detalle del balde masticador de la mandibula. / / Fig. 6 Aparato reproductor. 220 Agradecimientos: Agradecemosvivamente a la Excma. Diputaci6n Provincial de Cadiz la financiaci6n de la publicaci6n integra de este trabajo. Asimismo. agra- decemosprofundamente a D. Alfonso L6pez Almagro, excepcional media- dor entre la citada instituci6n y nuestro Departamento, su interés mostra- do en todos los aspectos cientificos que ataften al litoral gaditano y en especial por este trabajo. cuya publicaci6n no hubiera sido posible sin su inestimable ayuda y cooperaci6n. BIBLIOGRAFIA CERVERAl.L. Y GARCIA l.C., (en prensa) - Moluscos opistobranquios dellitoral occidental an- daluz: nuevas aportaciones faunisticas. Ibericus. EDMuNDs M., 1970 - Opisthobranchiate Mollusca tram Tanzania. II. Eolidacea (Cuthonidae, Piseinotecidae and Facelinidae). Proc. Malac. Soc. London 39 (l): 15-57. EDMuNDs M., 1977 - LaNal development, oceanic currents, and origins of the opisthobranch fauna of Ghana. J. moli. Stud. 43: 301-308. MARCUS Er., 1955 - Opisthobranchia from Brazil. Bol. Fac. Fil. Ci. Letr. Univo Sao Paulo Zool. 20 (2): 89-261. SCHMEKEL L., 1965 - Calmella sphaert/era n. sp., ein neuer Aeolidier aus dem Mittelmeer (Gastr., Opisthobranchia). Pubbl. Staz. Zool. Napoli 34: 452-461. SCHMEKEL L., 1980 - Synopsis of the genus Piseinotecus with description of Piseinotecus eveli- nae spec. nov. Veliger 23 (l): 21-24. SCHMEKEL L. und PORTMANN A., 1982 - Opisthobranchia des Mittelmeeres: Nudibranchia und Sacoglossa. Springer-Verlag; Berlin; 410 pp. VINCENTE N., 1975 - Une nouvelle espèce de gasteropode nudibranche en Mediterranée: Face- lina gabinieri nov. sp. Trav. Sa. Parco Nation. Port-Cros l: 67-74. EXPLICACION DE LAS ABREVIATURAS am: ampolla b: boca bh: bianco hialino ho: bianco opaco cd: conducto deferente ch: conducto hermafrodita cs: castano g: g6nada gg: giandula gametoIitica glf: giandula femenina ov: oviducto p: pene r: rojo oscuro ti: rin6foro rs: receptaculo seminai sp: espermoviducto to: tentaculo oral tp: tentaculo propodial 221 , ' '" O) '" o o 0)..", ... > ~ - =' "',~.zj ~ ~80'~~'",~ O) = O) O) ~B c. '" c.~ "',~ "s ~.g '" """ '" 'CO " ç; 5 u §]~~ §b5~ " ~,s = c ~5 ~ O.J:: '"v t c~.58.g ~8cg8~ '3 ~§ Q.
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