Diversity and systematics of Haminoeidae gastropods (Heterobranchia: Cephalaspidea) in the tropical West Pacific Ocean: new data on the genera Aliculastrum, Atys, Diniatys and Liloa Author Too, Chin Chin Author Carlson, Clay Affiliated to: Marine Laboratory, University of Guam, Mangilao, GU 96923 Author Hoff, Patty Jo Affiliated to: Marine Laboratory, University of Guam, Mangilao, GU 96923 Author Malaquias, Manuel António E. text Zootaxa 2014 2014-05-07 3794 3 355 392 journal article 5612 10.11646/zootaxa.3794.3.3 74c8a3cd-c737-41aa-b574-04ef00c173f7 1175-5326 4914927 A9A30A4F-D095-47EE-9120-B0B5A7BCCE88 Genus Aliculastrum Pilsbry, 1896 Type species: Bulla cylindrica Helbling, 1779 The genus Aliculastrum was introduced by Pilsbry (1896) as a replacement name for Alicula Ehrenberg, 1831 . The latter name was preoccupied by Alicula Eichwald, 1830 in reference to another group of marine gastropods with a projecting spire and based on a fossil placed in the family Scaphandridae ( Bouchet 2010 ) . The type species, Aliculastrum cylindricum was originally ascribed to the genus Bulla ( Helbling 1779 ) and has been arbitrarily attributed to the genera Atys ( Sowerby 1870 ; Gosliner et al . 2008 ) and Aliculastrum ( Habe 1952 ; Lin 1997 ; Qi 2004 ). There is very limited literature documenting the characters that define the genus Aliculastrum . According to Lin (1997) , this genus includes species that possess a cylindrical elongated shell, with spiral grooves at both ends and no umbilicus. Aliculastrum cylindricum was described as umbilicated ( Helbling 1779 ; Adams 1850 ). However, Chemnitz (1788) mentioned that this is simply a depression that looks very much like an umbilicus. Species ascribed to this genus in the tropical West Pacific include A. cylindricum ( Helbling, 1779 ) , A. debilis ( Pease, 1860 ) and A. parallelum ( Gould, 1846 ) ( Pilsbry 1896 ; Habe 1952 ; Lin 1997 ; Carlson & Hoff 2003 ; Qi 2004 ) ( Tab. 1 ).