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Danilo Scuderi a New Species of Rissoid of the Genus Alvania Risso

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Danilo Scuderi a New Species of Rissoid of the Genus Alvania Risso Biodiversity Journal , 2014, 5 (2): 201–208 A new species of rissoid of the genus Alvania Risso, 1826 from the E-Sicily: Alvania maximilicutiani n. sp. (Gastropoda Ris - soidae) Danilo Scuderi Via Mauro de Mauro 15b, 95032 Belpasso, Catania, Italy; e-mail: [email protected] ABSTRACT Alvania maximilicutiani n. sp. is here described and figured as a new Mediterranean species from th e E-Sicily. The most similar species in morphological characters are A. clathrella (Seguenza L., 1903), A. dalmatica Buzzurro et Prkić, 2007, A. dianiensis Oliverio, 1988, A. dictyophora (Philippi, 1844), A. hallgassi Amati et Oliverio, 1985. All these species and other similar Mediterranean and not Mediterranean congeners are here compared to the new species, which differs by the very minute dimensions, being one of the smaller Alvania ever described, the protoconch morphology and the colour pattern of the external soft parts. The Macaronesian A. p iersmai Moolenbeek et Hoenselaar, 1989, A. poucheti Dautzenberg, 1889, A. spreta (Watson,1873) and other congeners are furthermore compared to A. maximilicutiani n.sp. The new species could also resemble a dwarf form of A. lanciae , but to a more deepened exam of the shell the latter species appears morphologically very different in both protoconch and teleoconch characters. The type material of A. maximilicutiani n.sp. was collected in very shallow waters in the rocky shores of the small village S. Giovanni Li Cuti (Catania, Italy). KEY WORDS Gastropoda; Rissoidae; new species; taxonomy; Mediterranean Sea; Recent. Received 13.04.2014; accepted 19.05.2014; printed 30.06.2014 INTRODUCTION habitat preferences (Ponder, 1985). Similitudes are close related as concerns the animal and shell be- Rissoids of the genus Alvania Risso, 1826 un - tween genera Alvania and Crisilla Monterosato, dergone a high adaptive radiation and are uniformly 1917 being the latter tentatively separated only as distributed along the main marine biocenosis. Some a subgenus by Ponder (1985), but currently consid- Authors debated whether they could be considered ered as a valid separated genus for the actual check- as representative species of a separated family lists (Clemam, 2013; MarBEF, 2013). (Golikov & Starobogatov, 1975), mainly based on The Mediterranean represents an elective geo - anatomical proofs which other Authors, through graphic area where rissoids exhibit wonderful pat - further deepened studies, considered not as clear terns of speciation (Bouchet in Giannuzzi-Savelli and stable characters but only as anatomical schemes et al., 1996), due to its environmental variability of variable among species (Ponder, 1984). The anatomy habitats. With 160 species of rissoids the Mediter - of Alvania is thus comparable to that of Rissoa De - ranean represents the most diverse site in the world smarest, 1814 being the animals rather similar in and plays an important role as one of the source of structure and differences are due mainly to different rissoid-flow in the world (Ávila et al., 2012). In the 202 DANILO SCUDERI Mediterranean sea and the adjacent Macaronesian A new species of Alvania , named A. maximilicu - area (E-Atlantic) the genus Alvania is the most tiani n.sp., was found in the E-Sicily coasts (Fig. 1) abundant of rissoid species (Gofas, 1990; Van der and is here described and figured as new for science Linden, 1993; Hoenselaar, H.J. & Goud, J., 1998; and compared to the close similar congeners. Ávila, 2000; 2012), while lower number of species are also present in the western Atlantic and Indo- Pacific Ocean (Bouchet in Giannuzzi-Savelli et al., MATERIAL AND METHODS 1997; Garilli & Parrinello, 2010), E-Africa (Gofas, 1999). In particular, species with non-planktotrophic Living materials of the new species were col- development seem to be limited to only the western lected by brushing the surface of little lava stones or the eastern part of the Mediterranean (Garilli & inside a net of 0.5 mm mesh at a depth of 0.5 to Parrinello, 2010). Moreover, this basin is the site 2.5 m. No empty material was found among the with higher number of endemic species of Alvania shell grit collected handily with ARA. Drawings (Ávila et al., 2012). Many species of Rissoidae are of the external soft parts were obtained observing the living animals in aquarium. Fossil materials of reported as endemisms to restricted areas of Mediter - similar species were studied and compared to the ranean, particularly islands (Bogi et al., 1983; Oli - new Alvania . verio, 1986; Amati & Oliverio, 1987; Oliverio, ACRONYMS. Museo del Dipartimento di Bio - 1988; Giusti & Nofroni, 1989; Oliverio & Amati, logia Animale, University of Catania, Italy 1990; Cecalupo & Quadri, 1995; Margelli, 2001; (MBAC); Alberto Villari malacological collection, Buzzurro, 2003; Micali et al., 2005; Buzzurro & Messina, Italy (AVC); Bruno Amati malacological Landini, 2006; Buzzurro & Prkić, 2007; Oliver & collection, Roma, Italy (BAC); Danilo Scuderi ma - Templado, 2009). Numerous species of molluscs, lacological collection, Catania, Italy (DSC). among which some of Alvania , are described as en - demic to the E-Sicily, which represents a high hotspot for the speciation of molluscs in the Mediterranean, Alvania maximilicutiani n. sp. due probably to its variety of different environments present in this area: A. dictyophora (Philippi, 1844) ExAMINED MATERIAL . Holotypus, Catania, E-Si - and A. clathrella (Seguenza L., 1903, ex Mon- cily, Italy: S. Giovanni Li Cuti, in shallow water, terosato ms) are an example. under lava stones. Paratypi, same data of holotypus, 11 living specimens. Holotype in MBAC, n. MBLMC-CT-79; 1 paratype in AVC; 1 paratype in BAC. Other paratypes in DSC. DESCRIPTION OF HOLOTYPUS . Shell (Fig. 6) ovate-conic, stout, relatively strong, imperforate, 1.1 mm high x 0.65 mm broad. Teleoconch consti - tuted by 1.9 whorls in adult specimens, separated by marked sutures, bearing two spiral chords on the first and rather on the majority of the last whorl: only a trace of a third spiral chord appear almost at the end-half of the last whorl. Spiral micro sculpture is present over the surface of all the tele-whorls. The axial ribs are angular, marked, opisthocline and in number of 12 on the first tele-whorl, 14 on the body whorls, never reaching the base of the shell. The first adapical spiral chords are less marked than the axial ribs and become stronger at the base. They form a cancellate sculpture at the intersection with Figure 1. Study area. the axial ribs, with not marked, almost rounded, A new species of rissoid of the genus Alvania from the E-Sicily: Alvania maximilicutiani n. sp. (Gastropoda Rissoidae) 203 tubercles at the crossing points. At the base four BIOLOGY AND DISTRIBUTION . The new species well marked spirals are present, except the last seem confined exclusively to rocky very shallow which appears almost vanishing. Very thin spiral waters, under stones. Only living specimens were threads cover the interspace and run over the axial hardly collected. It was never recorded among shell ribs too. The last whorl forms rather 76% of the grit. The new species was collected only from the total shell height. Aperture ovate, drop shaped, with type locality in the Jonian sea, but, because of its thick uninterrupted peristome, which bears no den - very small dimensions, it could be unnoticed and ticles and form a varix in the outer lip. Background its real distribution range could be wider. colour almost dark-brown in protoconch and first COMPARATIVE NOTES . Because of the very small tele-whorl, creamy in the body-whorl with two dimensions of adult specimens, the peculiar charac - small darker bands, the first sub-sutural, which ters of the teleoconch, particularly the number of forms dark spots in correspondence of the tubercles whorls, the sculpture and the colour pattern of the (one every three axial ribs) and the second, larger, shell, the protoconch sculpture and the external soft at the base. parts of the living animal, the new species is unique Protoconch (Figs. 10, 11) low-rise, paucispiral among all the Mediterranean and not Mediterranean with direct development, constituted by 1.3 to 1.5 species of the same genus. The comparative notes regularly convex whorls. Protoconch I slightly less here following explore the possibility that a dwarf than 1 whorl, with 7-8 very thin spiral threads. Pro - for m of a still known species is involved and toconch II with 13-14 equally thin spiral threads. demonstrate the validity of the new species. So, The living animal (Fig. 12) is whitish as back - among Mediterranean species, A. maximilicutiani ground colour and bears dark-brown to almost black n. s p. is morphologically similar to A. lanciae strips on head, anterior foot and opercular area. In (C alcara, 1845), A. aeoliae Palazzi, 1988, A. the head they are “V” shaped just before the eyes datchaensis Amati et Oliverio, 1987, A. fractospira and straight in the snout and foot, surrounding the (Oberling, 1970) on one hand and to A. dictyophora , operculum and extending to the edge in the middle A. hallgassi Amati et Oliverio, 1985, A. dianiensis of the foot: it is not visible on the sole of the foot, Oliverio, 1988, A. dalmatica Buzzurro et Prkic, where a whitish gland is visible in transparency in 2007 on another hand. In the meantime the new the middle. The same gland is visible under the oper - species is here compared to some Macaronesian culum. Two whitish granular masses are also visible congeners: A. grancanariensis Segers,1999, A. on the snout just near the eyes. Few white stains are hoeksemai Hoenselaar et Goud, 1998, A. moniziana pres ent on both the cephalic tentacles. Only one (Watson, 1873), A. piersmai Moolenbeek et Hoense - metapodial tentacle is visible. Operculum (Fig. 9) laar, 1989, A. poucheti Dautzenberg, 1889, A. spreta thin, paucispiral, with eccentric nucleus. (Watson,1873).
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