Telodiacria quadridentata

Abstract

Telodiacria quadridentata (Blainville, 1822) (Figs 5 F-H) Description. – Shell only slightly longer than wide (L 2.7, W 2.3 mm), dorsal shell part with five clear longitudinal ribs, weaker towards the caudal spine mark, with marked growth lines in between and about 7 imbricate transversal striae adjoining the aperture. The lateral spines point outward. Ventral part of the shell globose and smooth. In fresh specimens the thickened apertural margins are orange-brown coloured. Remarks. – The shells are larger and wider than those of T. costata, but for firm identification the number of transverse striae on the dorsal side are key: 5 or more in T. quadridentata. Distribution. – The species is occurs in small numbers on the inner to mid shelf sands and coral banks in Sarawak and Brunei, outer shelf (silty) sand in Sarawak (DD29) and Sabah (DD92-93), but is more abundant on the Royal Charlotte atoll, Spratly Islands. One specimen was found in the Holocene shoreface deposits of Sungai Baong, Miri, It always occurs together with T. costata.

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