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Aliculastrum debile (Pease, 1860) [Atys]

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Aliculastrum debile is characterized by a translucent to opaque-white, spindle-shaped shell with prominent striations at both ends, but without striations in the middle of the shell. It was described and known for a long time only from Hawaii.
Species of the family Haminoeidae are herbivorous cephalaspideans.
The above specimens #1 and #2 were identified by the photographer Gordon Tillen, the ID was confirmed by David W. Behrens and by Clay Carlson, thanks! The specimen #3 was identified by the photographer, the late Ilan Lubitz, RIP, the ID was not confirmed.
In a recent (26 September 2011) email wrote Clay Carlson: "I already have records of A. debilis from many areas in the Pacific as well as the Indian Ocean."
Very similar is Aliculastrum cylindricum (Helbling, 1779) [Bulla] which is a common Indo-West Pacific species, it differs by a wider shell posteriorly.
In a recent (26 September 2011) email wrote Clay Carlson: "The major criteria appears to be the slight posterior hook/extension of the last whorl of the shell."
Wikipedia lists more than 50 species of Atys, and there are 13 species of Atys in IPN, pages 22 - 25,
I really don't know how to distinguish them.
All species of the genera Aliculastrum and Atys are herbivorous, related to Haminoea and Phanerophthalmus. At present most species are tropical and have heavy well-calcified shells. In most cases the true foot is short and the shell extends a considerable distance beyond its posterior end. It is possible when more of the many tropical species are studied that they will be placed in other genera.
This species was posted on 23 September 2011 at these websites as Atys debilis  Pease, 1860.
Too et al. (2014) moved it into the genus Aliculastrum  Pilsbry, 1896 and changed the ending of the specific name into debile.
I changed it on 11 November 2019 into Aliculastrum debile (Pease, 1860) [Atys].
References:
Gosliner, Terrence M., David W. Behrens & Ángel Valdés. 2008. Indo-Pacific Nudibranchs and Sea Slugs. Sea Challengers Natural History Books.
Gig Harbor, Washington. 426 pp.,
Too, C. C.; Carlson, C.; Hoff, P. J.; Malaquias, M. A. E. (2014). Diversity and systematics of Haminoeidae gastropods (Heterobranchia: Cephalaspidea) in the tropical West Pacific Ocean: new data on the genera Aliculastrum, Atys, Diniatys and Liloa.
Zootaxa. 3794 (3): 355–392., available online at http://dx.doi.org/10.11646/zootaxa.3794.3.3.
More information on Aliculastrum debile as Aliculastrum debilis are on Sea Slugs of Hawaii!
How to cite:
Köhler, E. (2019), published 11 November 2019, Aliculastrum debile (Pease, 1860)
available from https://www.Philippine-Sea-Slugs.com/Cephalaspidea/Atys_debilis.htm

 
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