D. P. ClLIA 
A new Javan species of Agaronia 
of ail other four Indian Océan représentatives of the 
genus (J. Abbas, pers. comm. XI 1.2009) (refer to 
Table 1). Of these, Agaronia nebulosa (Lamarck, 
1811) may easily be distinguished by a reticulated 
pattern over a (generally) very pale background 
combined with a thick pariétal callosity, while 
Agaronia gibbosa (Born, 1778) features réticulation, a 
significantly lower H/D ratio, a strongly marked 
postfasciole and a thick pariétal callosity. The lighter, 
occasionally non-reticulated form flavescens Melvill, 
1904 has a colour which is relatively close to that of 
A . johnabbasi, but the dimensions and the 
geographical provenance (South India) set it apart at 
first glance. Agaronia lutaria (Rôding, 1798) is larger 
and more slender, with a narrower aperture and strong 
réticulation. The différences from A. johnabbasi are 
herein illustrated by a juvénile specimen of the saine 
size as two of the paratypes (Figs 7-8). A doser 
relative of A. johnabbasi is Agaronia johnkochi 
Voskuil, 1990 (Figs 9-10). This is suggested by the 
absence of réticulation, a similarly curved outline of 
the outer lip, a similarly proportioned spire callus 
which does not bulge out disproportionately towards 
the aperture, and the strong démarcation of colour, in 
perpendicular direction to the filament channel, 
between the pigmented spiral and the whitish pariétal 
calluses. However, the spire of A. johnabbasi is higher 
and more acutely angled than that of A. johnkochi , 
while the spiral callus is lighter in colour, contrasting 
less with the rest of the whorl. The widest part of the 
shell of A. johnabbasi is doser to the apical part of the 
shell, the pariétal callus is thinner, and the oblique 
striae on the pillar structure are thinner and doser to 
each other, with no chromatic aberrations between 
them; ail these features are consistent and may be used 
for morphological différentiation between the two 
species. 
The gracile shell of A. johnabbasi is also similar to 
that of the West African Agaronia hiatula 
(Gmelin, 1791), but the outer lip is recurved and 
therefore the aperture is narrower. 
Etymology. The species is named after John Abbas 
(Jakarta, Indonesia) who initially recognized the 
species as a new one, kindly bringing it to the author s 
attention. 
ACKNOWLEDGEMENTS 
The author is indebted to John Abbas for the 
specimens sent for examination, including 
comparative material, Eddy Wilmet (Mechelen, 
Belgium) for comparative material, Jon Camilleri 
(Birkirkara, Malta) for the photography of specimens, 
Roland Houart (Landen, Belgium) for éditorial 
comments and recommendations and John J. Borg 
(NMNH), Philippe Bouchet & Virginie Héros 
(MNHN), Guido Poppe & Sheila Tagaro 
(conchology.be) for technical assistance. 
REFERENCES 
Bouchet, P. & Rocroi J.-P., 2005. Classification and 
nomenclator of gastropod families. Malacologia , 
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Marrat, F. P., 1871. Oliva , Bruguière. Thésaurus 
Conchyliorum , 4: 1-46 + pis. 342-351. 
Olsson, A. A., 1956. Studies on the genus Olivella. 
Proceedings of the Academy of Nat lirai Sciences of 
Philadelphia , 108: 155-225. 
Petuch, E. J., 1987. New Caribbean molluscan faunas. 
pp. i-v + 1-154 + Al-A4 + 29 pl. Virginia (Coastal 
Education and Research Foundation). 
Ponder, W. F. & Warén, A., 1988. Classification of 
the Caenogastropoda and Heterostropha - A list of 
the family-group names and higher taxa. 
Malacological Review , Supplément 4: 288-326. 
Sterba, G. H. W., 2004. Olividae a collectors guide. 
pp. 1-172. Hackenheim (Conchbooks). 
Teso, V. & Pastorino, G., 2011. A révision of the 
genus Olivancillaria (Mollusca: Olividae) from the 
southwestern Atlantic. Zootaxa , 2889: 1-34. 
Vaught, K. C., 1989. A classification of the living 
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 
