Atlanta brunnea J. E. Gray 1850

Abstract

Atlanta brunnea J.E. Gray, 1850 (Figs 2 A-D) Description. – Protoconch high, triangular, ornamented with zigzag spiral lines, ~4 whorls, brown. Single teleoconch whorl (W 1.4 mm), smooth, white or brown, with white wide keel. Remarks. – The species is easily recognised based on the brown protoconch which is not as high as in A. turriculata, and the teleoconch whorls are more globose, rising above the protoconch. The protoconch is heavily ornamented, but the spiral lines are only visible at high magnification. Some specimens have a more stepped protoconch. Generally, the teleoconch is whitish, occasionally brown, except for the white keel. Wall-Palmer et al. (2019) recognised Atlantic and Pacific forms for this species. Distribution. – This species has been found on the Brunei middle to outer shelf (MES17, 24, 25), Sarawak outer shelf (DD29), Sabah outer shelf (DD93) and at Royal Charlotte atoll in oceanic setting.

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