Diacavolinia longirostris
Abstract
Diacavolinia cf. longirostris (Blainville, 1821) (Figs 4 T-AD) Description. – Medium size Diacavolinia (L 5-7 mm, W 5-7 mm). Triangular shell with long dorsal lip that may have varied shape, but lacks constrictions, ventral lip with median depression. Dorsal side with well-developed central rib and weaker lateral ribs and lock ribs. Ventral side globose and smooth. Lateral spines sharp, slightly bent and hooked, but damaged in many specimens. Most specimens have clear growth lines, especially on the ventral side. Translucent, white to yellowish or brownish. Remarks. – The late A.W. Janssen originally identified these specimens as Diacavolinia elegans Van der Spoel, Bleeker & Kobayasi, 1993, then changed this to D. longirostris. As D. longirostris is now interpreted to be restricted to the Atlantic (Burridge et al., 2019) it is unclear to what species these specimens represent. They have a constant lateral profile, but the lateral spines vary from short to relatively long. It is well possible that this morphotype comprises various species, e.g. Diacavolinia triangulata Van der Spoel, Bleeker & Kobayasi, 1993 (Figs 4 T-V 4Z, 4AB-AD). Distribution. – This is a very common and widely distributed species that occurs in large quantities throughout the North Sarawak-Brunei area and Royal Charlotte atoll, in shelf to continental slope mud, subtidal coral banks, coral reefs, subtidal sandy areas and frequently washes up on beaches.
Authors 4
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Raven Aachen
Affiliation as printed
Research Associate, Naturalis Biodiversity Center, Leiden, The Netherlands. E-mail: han. raven @ naturalis. nl; https: // orcid. org / 0000 - 0002 - 5305 - 0795
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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
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