Atlanta helicinoidea J. E. Gray 1850

Abstract

Atlanta helicinoidea J.E. Gray, 1850 (Figs 2 N-P) Description. – Low spired protoconch of ~4.5 whorls with marked spiral ridges, generally cream coloured. Teleoconch wide (W to 2 mm), single relatively inflated whorl, smooth, translucent. Remarks. – This species has a remarkably large protoconch (>0.25 of shell diameter) of closely positioned whorls. The teleoconch is just under a whorl thus revealing the protoconch sculpture near the aperture. Both characteristics differentiate it from the similar Atlanta inflata J.E. Gray, 1850. Distribution. – Only few shells of this species were found at Batu Mat coral bank, Sarawak, and in the shelf mud surrounding it, one at Royal Charlotte atoll and the Brunei middle shelf (MES 25).

Authors 4

1. Han
2. J. G. M.
3. Raven Aachen

   Naturalis Biodiversity Center

   Affiliation as printed

   Research Associate, Naturalis Biodiversity Center, Leiden, The Netherlands. E-mail: han. raven @ naturalis. nl; https: // orcid. org / 0000 - 0002 - 5305 - 0795

4. David J. Marshall

   Universiti Brunei Darussalam

   Affiliation as printed

   Environmental and Life Sciences, Faculty of Science, Universiti Brunei Darussalam, Brunei Darussalam. https: // orcid. org / 0000 - 0003 - 3771 - 5950 * Corresponding author. E-mail: david. marshall @ ubd. edu. bn