Pseudosimnia lacrima, Simone & Cunha, 2012

Simone, Luiz Ricardo L. & Cunha, Carlo M., 2012, Taxonomic study on the molluscs collected in Marion-Dufresne expedition (MD 55) to SE Brazil: Xenophoridae, Cypraeoidea, mitriforms and Terebridae (Caenogastropoda), Zoosystema 34 (4), pp. 745-781 : 752-754

publication ID

https://doi.org/ 10.5252/z2012n4a6

publication LSID

lsid:zoobank.org:pub:857CAD31-66E1-4CEE-AB4D-CCD64541D0EF

persistent identifier

https://treatment.plazi.org/id/DC0D476B-166A-4F9D-A11D-03FDCE56A9F4

taxon LSID

lsid:zoobank.org:act:DC0D476B-166A-4F9D-A11D-03FDCE56A9F4

treatment provided by

Felipe

scientific name

Pseudosimnia lacrima
status

n. sp.

Pseudosimnia lacrima n. sp.

( Fig. 3 View FIG M-O)

TYPE MATERIAL. — Holotype: Brazil, Espírito Santo, off Itaúnas, continental slope of Abrolhos, 18°59’S, 37°48’W, 607-620 m depth, MNHN 25217 ( Fig. 3 View FIG M-O) ( MD 55, stn DC 73, Bouchet, Leal & Métivier coll., 27. V.1987). Paratype: off Regência, 19°40’S, 37°48’W, 790-940 m depth, MZSP 104319, 1 shell (stn CB 77).

TYPE LOCALITY. — Brazil, Espírito Santo, off Itaúnas, continental slope of Abrolhos, 18°59’S, 37°48’W, 607- 620 m depth ( MD 55, stn DC 73).

DISTRIBUTION. — Only known from the type locality.

ETYMOLOGY. — The specific epithet is derived from the Latin “lacrima”, meaning tear, an allusion to the general form of the shell.

DIAGNOSIS. — Shell length c. 7 mm, strongly biconic; width c. 60% of length. Periphery very thick, forming callus. Inner lip with c. 13 well-spaced teeth, protruded mostly inside.

DESCRIPTION

Shell: outline biconic, thick, strongly involute; length 7.5 mm. Colour pure white, weakly glossy. Width c. 60% of length; wider region located between 3�5 and 4�5 of shell length ( Fig. 3M, O View FIG ). Height c. 80% of width. Superior angulation c. 80°; inferior angulation c. 60°; left side more weakly rounded than right side. Periphery marked by strong callus, comprising c. ⅓ of shell height ( Fig. 3N View FIG ). Aperture narrow, comprising c. 80% of shell length and c. 12% of shell width; uniform width along its length, weakly arched, somewhat parallel to left shell edge. Outer lip thick, with c. 32% of shell width, thicker in middle, gradually narrowing towards both canals; c. 13 small, rounded teeth more protruded inside ( Fig. 3O View FIG ), with weak radial fold in inner region of ventral surface, corresponding to each tooth; teeth uniformly sized from each other, and with interval equivalent to each tooth; teeth slightly closer with each other anteriorly. Inner lip simple, lacking teeth; weak callus at base of anal siphon, somewhat protruded ventrally ( Fig. 3N View FIG ). Canals with thick edges; anal canal weakly more pointed than incurrent canal ( Fig. 3O View FIG ).

MEASUREMENTS (in mm). — Holotype: 7.5 × 4.8.

HABITAT. — Sandy-mud bottoms, 607-940 m depth.

REMARKS

Pseudosimnia lacrima n. sp. is somewhat similar in shape to Primovula concinna (Adams & Reeve, 1848) from eastern Africa ( Cate 1973), but differs in lacking developed transverse striae, by a wider shell region in the middle (instead of upper third), a wider aperture and teeth protruding inside the aperture. It differs from Pseudosimnia carnea (Poiret, 1789) , from the Mediterranean, in having thicker walls, fewer labial teeth and a more rounded siphonal canal. It differs from P. perilla Cate, 1973 in being wider and shorter, in having fewer teeth in the outer lip, and by possessing a closed anterior canal. In the same region, only two deep-water ovulids occur, P. vanhyningi (Smith, 1940) and Spiculata bijuri Cate, 1976 ( Simone 2007); P. lacrima n. sp. differs from the former in being much smaller, in having wider anterior and posterior ends, and by having canals broader and less protruded; from the latter P. lacrima n. sp. differs in being shorter, in having much blunter anterior and posterior ends, thicker walls, callus less protruded and the teeth in inner lip.

Family TRIVIIDAE Troschel, 1863

MNHN

Museum National d'Histoire Naturelle

MD

Museum Donaueschingen

V

Royal British Columbia Museum - Herbarium

MZSP

Sao Paulo, Museu de Zoologia da Universidade de Sao Paulo

CB

The CB Rhizobium Collection

Kingdom

Animalia

Phylum

Mollusca

Class

Gastropoda

Order

Littorinimorpha

Family

Ovulidae

Genus

Pseudosimnia

Loc

Pseudosimnia lacrima

Simone, Luiz Ricardo L. & Cunha, Carlo M. 2012
2012
Loc

Pseudosimnia lacrima

Simone & Cunha 2012
2012
Loc

P. lacrima

Simone & Cunha 2012
2012
Loc

P. lacrima

Simone & Cunha 2012
2012
Loc

Spiculata bijuri

Cate 1976
1976
Loc

P. perilla

Cate 1973
1973
Loc

TRIVIIDAE

Troschel 1863
1863