D. P. ClLIA Novapex 13(1): 33-36, 10 mars 2012 A new Javan species of Agaronia Gray, 1839 (Neogastropoda, Olividae) David P. CILIA 29, Triq il-Palazz 1-Ahmar, Santa Vénéra SVR1454, Malta [email protected]. KEYWORDS. Olividae, Indian Océan, Java, Indonesia, Agaronia johnabbasi sp. nov. ABSTRACT. A new species of olivid neogastropod from West Java, Agaronia johnabbasi sp. nov., is described according to conchological characters. It is distinguished from congeners by means of its distinctive morphology and colouration. INTRODUCTION Genus Agaronia Gray, 1839 Type species by monotypy Voluta hiatula Gmelin, The highly evolved gastropods in the family Olividae 1791, West Africa are found circumglobally in predominantly tropical or subtropical waters. Ail inhabit soft substrates Agaronia johnabbasi sp. nov. including sand and silt, though the depths at which Figs.1-6 different species may be found vary from the littoral to the sublittoral. The genus Agaronia Gray, 1839 is Type material. Collected by fishermen, c. -60m on sometimes regarded as forming part of the subfamily silty substrate, east Pangandaran Bay, Java, Indonesia, Agaroniinae Olsson, 1956 (Olsson, 1956; Ponder & October 2009. Holotype MNHN 23267; paratypes: Warén, 1988; Vaught, 1989; Sterba, 2004); though in DC R.GA 1000-1; GP unreg.; JA unreg.; NMNH Bouchet & Rocroi (2005), this taxon is synonymized unreg. with Olivinae Latreille, 1825. The majority of species are concentrated along the west African and east Type locality. East Pangandaran Bay, Java, Indonesia. American coasti ines, with some Indian Océan représentatives that include the species described Description. Dextral solid shell, of maximum height herein (see Table 1 for a complété list of recent of about 40mm and a height/diameter ratio of about species). 2.8. Spire tall and conical, with a slightly concave profile and featuring a spiral callus occupying about Abbreviations half the height of each whorl. Widest band of the body whorl a uniform dark-orange brown, sometimes with a Descriptive: D - diameter; H - height. purplish tinge intensifying towards the suture. This colouration is continuons along the spire, contrasting Repositories: DC: collection of author, Santa Vénéra, with the orange-brown spiral callus. Thin wash of Malta; GP: collection of Guido T. Poppe, Cebu, white callus présent on the columellar side of the Philippines; JA: collection of John Abbas, Jakarta, aperture close to the filament channel. Just above the Indonesia; MNHN: Muséum national d’Histoire postfasciole, a thin pale band is discemible. The naturelle, Paris, France; NMNH: National Muséum of postfasciole and the fasciole are of the same colour Natural History, Mdina, Malta. and are considerably paler than the main part of the body whorl, with the former featuring a few very fine MATERIALS & METHODS spiral threads and numerous darker growth striae which do not extend upon the fasciole. The belt and Seven shells were collected by fishermen with bottom the base of the columellar callosity are beige. Outer lip trawling nets from the eastem bay in Pangandaran, thin, with its outline recurved, and, at the proximity of West Java, in late 2009, at a depth of about 60m. Their the siphonal canal, almost parallel with the columellar shell morphology was compared and contrasted with side of the aperture. that of the five known sympatric congeners. Maximum diameter and height of the shells, the Dimensions. See Table 2 for details. former incorporating the lip, were measured twice using a dial caliper with a resolution of 50pm, the Remarks. In colouration, the new species is average of the two measurements was then calculated remarkable in its distinct lack of pattern (except for and noted. the growth lines typical of ail Agaronia) and, unusually for the genus, the colouration of the SYSTEMATICS postfasciole and fasciole, which are lighter in colour Family OLIVIDAE Latreille, 1825 than the main part of the body whorl. The type locality Subfamily OLIVINAE Latreille, 1825 of the new species, Pangandaran Bay yields examples 33 A new Javan species of Agaronia D. P. ClLIA Etymology. The species is named after John Abbas of ail other four Indian Océan représentatives of the (Jakarta, Indonesia) who initially recognized the genus (J. Abbas, pers. comm. XI 1.2009) (refer to species as a new one, kindly bringing it to the author s Table 1). Of these, Agaronia nebulosa (Lamarck, 1811) may easily be distinguished by a reticulated attention. pattern over a (generally) very pale background ACKNOWLEDGEMENTS combined with a thick pariétal callosity, while Agaronia gibbosa (Born, 1778) features réticulation, a The author is indebted to John Abbas for the significantly lower H/D ratio, a strongly marked specimens sent for examination, including postfasciole and a thick pariétal callosity. The lighter, comparative material, Eddy Wilmet (Mechelen, occasionally non-reticulated form flavescens Melvill, Belgium) for comparative material, Jon Camilleri 1904 has a colour which is relatively close to that of (Birkirkara, Malta) for the photography of specimens, A. johnabbasi, but the dimensions and the Roland Houart (Landen, Belgium) for éditorial geographical provenance (South India) set it apart at comments and recommendations and John J. Borg first glance. Agaronia lutaria (Rôding, 1798) is larger (NMNH), Philippe Bouchet & Virginie Héros and more slender, with a narrower aperture and strong (MNHN), Guido Poppe & Sheila Tagaro réticulation. The différences from A. johnabbasi are (conchology.be) for technical assistance. herein illustrated by a juvénile specimen of the saine size as two of the paratypes (Figs 7-8). A doser REFERENCES relative of A. johnabbasi is Agaronia johnkochi Voskuil, 1990 (Figs 9-10). This is suggested by the Bouchet, P. & Rocroi J.-P., 2005. Classification and absence of réticulation, a similarly curved outline of nomenclator of gastropod families. Malacologia, the outer lip, a similarly proportioned spire callus 47(1-2): 1-397. which does not bulge out disproportionately towards Marrat, F. P., 1871. Oliva, Bruguière. Thésaurus the aperture, and the strong démarcation of colour, in Conchyliorum, 4: 1-46 + pis. 342-351. perpendicular direction to the filament channel, Olsson, A. A., 1956. Studies on the genus Olivella. between the pigmented spiral and the whitish pariétal Proceedings of the Academy of Nat lirai Sciences of calluses. However, the spire of A. johnabbasi is higher Philadelphia, 108: 155-225. and more acutely angled than that of A. johnkochi, Petuch, E. J., 1987. New Caribbean molluscan faunas. while the spiral callus is lighter in colour, contrasting pp. i-v + 1-154 + Al-A4 + 29 pl. Virginia (Coastal less with the rest of the whorl. The widest part of the Education and Research Foundation). shell of A. johnabbasi is doser to the apical part of the Ponder, W. F. & Warén, A., 1988. Classification of shell, the pariétal callus is thinner, and the oblique the Caenogastropoda and Heterostropha - A list of striae on the pillar structure are thinner and doser to the family-group names and higher taxa. each other, with no chromatic aberrations between Malacological Review, Supplément 4: 288-326. them; ail these features are consistent and may be used Sterba, G. H. W., 2004. Olividae a collectors guide. for morphological différentiation between the two pp. 1-172. Hackenheim (Conchbooks). species. Teso, V. & Pastorino, G., 2011. A révision of the The gracile shell of A. johnabbasi is also similar to genus Olivancillaria (Mollusca: Olividae) from the that of the West African Agaronia hiatula southwestern Atlantic. Zootaxa, 2889: 1-34. (Gmelin, 1791), but the outer lip is recurved and Vaught, K. C., 1989. A classification of the living therefore the aperture is narrower. Mollusca. pp. i-xii T 1-195. Florida (American Malacologists, Inc.). Figures 1-10 1-6. Agaronia johnabbasi sp. nov. East Pangandaran Bay, Java, Indonesia. 1-2. Holotype, MNHN 23267, 38mm; 3-4. Paratype 1, DPC R.GA1000, 41 mm; 5-6. Paratype 4, NMNH unreg., 31mm. 7-8. Agaronia lutaria (Rôding, 1798), East Pangandaran Bay, Java, Indonesia, 31mm (juvénile). 9-10. Agaronia johnkochi Voskuil, 1990. East Pangandaran Bay, Java, Indonesia, 47mm 34 NOVAPEX 13(1): 33-36, 10 mars 2012 D. P. ClLIA 35 A new Javan species of Agaronia D. P. ClLIA Oceanic division Name and authority Distribution Agaronia acuminata (Lamarck, 1811) West Africa East Atlantic A. adamii Terzer, 1992 Philippines West Pacific A. annotata Marrat, 1871 West Africa East Atlantic A. cauta (Marrat, 1871) West Africa East Atlantic A. gibbosa (Born, 1778) India to Malaya East Indian Océan A. griseoalba (von Martens, 1897) Central America (west) East Pacific A. hiatula (Gmelin, 1791) West Africa East Atlantic A. hilli Petuch, 1987 Central America (east) West Atlantic A. jesuitarum Lôpez, Montoya-Maquin Central America (west) East Pacific & Lôpez, 1988 A. johnabbasi sp. nov. Indonesia East Indian Océan A. johnkochi Voskuil, 1990 Indonesia East Indian Océan A. leonardhilli Petuch, 1987 Central America (east) West Atlantic A. lutaria (Rôding, 1798) Indonesia East Indian Océan A. nebulosa (Lamarck, 1811) Indonesia East Indian Océan A. nica Lôpez, Montoya-Maquln & Central America (west) East Pacific Lôpez, 1988 A. propatula (Conrad, 1849) Central America (west) East Pacific A. razetoi Terzer, 1992 West Africa East Atlantic A. steeriae (Reeve, 1850) South America (east) West Atlantic A. testacea (Lamarck, 1811) Central America (west) East Pacific A. travassosi Morretes, 1938 South America (east) West Atlantic Table 1. Recent species of Agaronia Gray, 1839 based onMarrat (1871), Petuch (1987), Sterba (2004), Teso & Pastorino (2011) and the présent research. Bold type indicates species in close geographical proximity to the new species. Paratype Paratype Holotype Paratype Paratype 6 Paratype 1 Paratype 2 4 5 MNHN 3 DPC mean DC R.GA1000 JA unreg. NMNH GP 23267 JA unreg. R.GA1001 unreg. unreg. H 38 41 40 33 31 31 28 35 D 14 15 14 12 11 11 10 12 H/D 2.7 2.7 2.9 2.8 2.8 2.8 2.8 2.8 l'able 2. Dimensions of the type sériés of Agaronia johnabbasi sp. nov. (7 specimens) and their mean value Measurements are in millimétrés. 36