Miscellanea Malacologica 6(2): 35-37 9.VIII.2013
Nassarius madurensis n. sp., a new nassariid species from south of Madura, Indonesia (Gastropoda: Nassariidae) Hugo H. KOOL Associate researcher Mollusca collection, Naturalis Biodiversity Center P.O. box 9517, 2300 RA Leiden, The Netherlands.
[email protected]
ABSTRACT A new nassariid, Nassarius madurensis n. sp., is described from the sea south of the island Madura in Indonesia. Keywords: Taxonomy, Nassariidae, Nassarius, new species, Madura, Indonesia.
INTRODUCTION
SYSTEMATICS
During the 1984-1985 Snellius II Expedition initiated by the Royal Netherlands Institute for Sea Research (NIOZ) a new species of the genus Nassarius has been collected. This expedition was an Indonesian/Dutch cooperation to explore and to augment the geological and biological knowledge of the vast Indonesian waters. In 1999, after studying their samples, the remaining marine sediments were donated by Dr Gerhard Cadée (NIOZ) to the Zoölogisch Museum of Amsterdam (ZMA), part of the University of Amsterdam, now merged with Naturalis Biodiversity Center, Leiden, the Netherlands. Recently I re-studied some samples collected by the Siboga Expedition (1899-1900). Already during this expedition some specimens of the new species were collected in the Straits of Madura.
Family: Nassariidae Iredale, 1916 Subfamily: Nassariinae Iredale, 1916 Genus: Nassarius Duméril, 1805 (type species by original designation Buccinum arcularia Linnaeus, 1758) Nassarius madurensis n. sp. (Figs 1-6) Type material.Holotype: Naturalis Biodiversity Center, ZMA. Moll. 408927, height 12.8 mm, width 6.2 mm (Figs 1-3). Paratypes: Indonesia, Java, South of Madura, Snellius II Expedition, 18.07.1984, station CAD84/22, 7.45° S, 113.5° E, 50 m. ZMA.Moll. 408928/1 (figs 4-6), ZMA.Moll. 408927/9, MNHN/1, HK 186.01/3.
Type locality.INDONESIA: Java, South of Madura, Snellius II Expedition (NIOZ), 18.07.1984, station CAD84/22, 7.45° S, 113.5° E, 50 m, leg. G. Cadée.
ACKNOWLEDGEMENTS Description of the holotype (Figs 1-3).Shell elongate ovate, shiny, height 12.8 mm, width 6.2 mm. Protoconch of 3.5 glassy whorls, last 2 whorls carinated; postnuclear whorls ribbed, penultimate whorl with 20 ribs, last whorl with about 24 ribs. Spiral sculpture weak and confined to the interspaces of the ribs; subsutural groove distinct, at base 6 to 7 overriding grooves. Suture ledged, not channelled. Aperture oval, outer lip with 6-7 strong, spinous denticles, not variced and about 15 fine lirae within; siphonal area with about 6 grooves, columella plicate throughout; columellar callus thin, narrow, well bordered and strictly limited to columella; parietal denticle strong, anal canal distinct.
I am grateful to Dr M.G. Harasewych (USNM) for the photographs of the holotype of Nassa casta, to Lee Ann Galindo (MNHN) for the photographs of the types of the new species, to L. J. van Gemert for his information about the Snellius II Expedition, and to R.G. Moolenbeek and one anonymous referee for the review of this paper.
OTHER ABBREVIATIONS HK Collection H. H. Kool, Dieren, The Netherlands MNHN Muséum national d’Histoire naturelle, Paris, France n. sp. new species USNM United States National Museum, Smithsonian Institution, Washington DC, U.S.A.
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Kool, 2013: Nassarius Colour white to creamy-yellowish, 2-3 faint darker bands. Aperture, outer lip, siphonal area and columella white. Operculum (not present in holotype, see Variability).
Nassarius castus has a strong varix and the outer lip has only very short denticles. The columellar callus of the two species is different: a stronger callus not limited to the columella in N. castus. The latter seems to have a very limited distribution: it is only known from the Fiji Islands (Kool, 2008: 14). I disagree with the opinion of Cernohorsky (1984: 132) that the latter species is extremely variable. Nassarius siquijorensis (A. Adams, 1852) (Fig. 9) has numerous ribs, is more obese, larger, and has a channeled suture. Nassarius multivocus Kool, 2008 (fig. 8) is less slender than N. madurensis n. sp., has fewer ribs, and is larger.
Other material examined.INDONESIA, Java, South of Madura, Snellius II Expedition, 18.07.1984, station CAD84/22, 7.45°S 113.5°E, 50 m, ZMA Moll. 099222/33, ZMA Moll. 154663/7; station CAD84/23, 7.5333°S 113°45’E, 48 m, ZMA Moll. 154660/77, HK 186.02/2; Madura Strait, Siboga Expedition, 08.03.1899, station SIB/002, 7°25’S 113°16’E, 56 m, ZMA Moll. 98005/9 (as Nassa siquijorensis var. Ads). Variability.The variability in size is considerable, although not exceptional for the genus; the smallest adult specimen measures 9.8 mm, the largest 13.5 mm. The number of the denticles in fullgrown specimens varies from 6-10. Operculum yellowish, and serrated.
REFERENCES Cernohorsky, W. O., 1984. Systematics of the family Nassariidae Mollusca: Gastropoda. Bulletin of the Auckland Institute and Museum 14: 1-356.
Habitat.The specimens from the Snellius II Expedition have been collected by bottom grab at 48-50 m in muddy clay, those from the Siboga Expedition by trawling in grey mud with some radiolariae at a depth of 56 m.
Kool, H. H., 2007. Nassarius garuda n.sp., a deepwater species from the Indonesian Tanimbar and Kai Islands and a review of the species N. cremates (Hinds, 1844), N. euglyptus (Sowerby III, 1914) and N. siquijorensis (A. Adams, 1852) (Gastropoda: Buccinoidea: Nassariidae). Miscellanea Malacologica 2: 87-92.
Distribution.Only known from Indonesia, the Strait of Madura.
Kool, H. H., 2008. On the identity of Nassarius castus (Gould, 1850), with the description of Nassarius multivocus n. sp. from the western Pacific (Gastropoda: Buccinoidea: Nassariidae). Miscellanea Malacologica 3: 1320.
Etymology.The species name refers to the Indonesian island Madura, northeast of Java. Discussion.There are several species comparable in one or more respects. Nassarius castus (Gould, 1850) (Fig. 7) is a ribbed species of comparable size and colour, but N. madurensis n. sp. has more, finer and less sinuous ribs, and is taller.
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Miscellanea Malacologica 6(2): 35-37
Figs 1-9. Nassariidae. 1-6. Nassarius madurensis n. sp. 1-3. Holotype, Indonesia, Madura, 7.45° S, 113.5° E, 50 m; Naturalis Biodiversity Center (ZMA.Moll. 408927), height 12.8 mm, width 6.2 mm (ventral, left lateral, dorsal); 4-6. Paratype, Naturalis Biodiversity Center (ZMA.Moll. 408928),7.45° S 113.5° E, 50 m, height 10.3 mm, width 5.2 mm (ventral, left lateral, dorsal) (photographs Lee Ann Galindo, MNHN); 7. Nassa casta (Gould, 1850) (Holotype, USNM No. 5724), Pacific Ocean, 10.1 mm (photograph USNM); 8. Nassarius multivocus Kool, 2008. Holotype (ZMA Moll. 408024) Japan, East China Sea, southwest Kyushu, off Nomo-Zaki, 100-120 m, height 19.9 mm; 9. Nassarius siquijorensis (A. Adams, 1852). Thailand, Hua Hin, height 23.8 mm (HK 506.39).
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