Diacavolinia Van der Spoel 1987

Abstract

Genus Diacavolinia Van der Spoel, 1987 Description. – Shell dorsoventrally depressed, with lateral spines. In adults the protoconch and larval shell are thrown off and the resulting opening closed. Shell aperture with closing structure linking dorsal and ventral sides (abbreviated from Van der Spoel, 1987). Remarks. – Van der Spoel (1987) introduced the genus based on a single species, D. longirostris. Later, Van der Spoel et al. (1993) recognised 24 species. Based on molecular studies, later authors (e.g., Maas et al., 2013; Burridge et al., 2019) realised that large morphological variation may occur within a single species and proposed different groupings, but further work is needed. In the NW Borneo material three to four different morphospecies are recognised, but allocation to the right species name is problematic as long as the overall revision of the genus is not completed. Therefore the names used here should be considered as preliminary assignment.

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