Limatula demiradiata, Allen, 2010

Allen, J. A., 2010, The Recent species of the genera Limatula and Limea (Bivalvia, Limacea) present in the Atlantic, with particular reference to those in deep water, Journal of Natural History 38 (20), pp. 2591-2653 : 2618-2621

publication ID	https://doi.org/ 10.1080/00222930310001647442
DOI	https://doi.org/10.5281/zenodo.5252707
persistent identifier	https://treatment.plazi.org/id/7A20464E-EC31-FFFC-FE50-6F22FC6CC872
treatment provided by	Felipe
scientific name	Limatula demiradiata
status	sp. nov.

Treatment

Limatula demiradiata View in CoL n. sp.

( figures 33 View FIG , 34 View FIG )

Type locality. Thalassa sta. Z398, 47 ‡ 33.8 ’ N, 07 ‡ 16.8 ’ W, 330 m.

Holotype. MNHP.

Material examined. Thalassa sta. Z398, 47 ‡ 33.8 ’ N, 07 ‡ 16.8 ’ W, 330 m, 1 spec.

Distribution. Found at a single station, west of Finisterre at edge of continental shelf from a sand sediment with an admixture of large shells in 330 m.

Description ( figures 33 View FIG , 34 View FIG ). Shell small (height 3.6 mm), height/length ratio 1:0.71, fragile, moderately inflated, equivalve, inequilateral, anteriorly oblique, ca 12 ‡ to vertical axis, transparent, eight or nine fine, sharp-ridged, ribs on anterior half of shell extend from close to umbo to antero-ventral margin, posterior to these 14–16 similar but very short ribs extend along the ventral margin of the shell, few irregular concentric growth lines with fine short spines where anterior ribs cross, ears not greatly extended and without ornament, shallow posterior subauricular sinus present, anterior subauricular sinus barely visible; umbo moderately prominent; hinge margin straight; ligament elongate, lozenge-shaped. Prodissoconch large, length~410 M m. No interdissoconch.

Anatomy. As far as can be seen through the shell, the anatomy differs little from those described above. The sensory layer of the inner mantle fold bears numerous annulate tentacles. The posterior adductor is particularly large. The gill has two demibranchs made up of homorhabdic filaments.

Remarks. This species is characterized by its oblique shape, straight hinge margin, few ribs limited to the anterior part of the shell, a limited number of ventral marginal ribs and lack of median raised ribs. No species with these characteristics has been recorded in the literature. The name is descriptive of the shell.