Rictaxis, Dall, 1871

Valdés, Ángel, 2008, Deep-sea “ cephalaspidean ” heterobranchs (Gastropoda) from the tropical southwest Pacific, Mémoires du Muséum national d'Histoire naturelle 196, pp. 587-792 : 594-596

publication ID

978-2-85653-614-8

persistent identifier

https://treatment.plazi.org/id/03D087B2-FFE3-BE27-FEE3-70D5F50DFE69

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Felipe

scientific name

Rictaxis
status

 

Genus RICTAXIS Dall, 1871 View in CoL

Rictaxis Dall, 1871: 136 View in CoL . Type species: Tornatella punctocaelata Carpenter, 1863 View in CoL [Recent and Pliocene, northeastern Pacific], by original designation.

Synonym:

Actaeonidea Gabb, 1872: 273 . Type species: Actaeonidea oryza Gabb, 1863 [Miocene, USA], by monotypy.

DIAGNOSIS. — Shell morphology. Shell external, fragile to solid, ovate, and transversely sulcate; spire variable. Aperture variable in size, anteriorly rounded. Inner lip slightly thickened. Columella with a small and simple fold. Umbilicus closed. Operculum present.

Anatomy. Radula composed of several denticulate lateral teeth. The inner lateral teeth are short whereas the outer teeth are much more elongated. Jaw with several denticulate elements.

REMARKS. — Dall (1871) introduced the genus Rictaxis based on the shell morphology, to include species with the columella obliquely truncated at the base. Later Marcus (1972) redescribed this genus using anatomical characters and included two species, Rictaxis punctocaelatus (Carpenter, 1864) , the type species, and Rictaxis punctostriatus (C. B. Adams, 1840) . The diagnosis above is based on Marcus (1972).

FIG. 3. Collection localities of species of Acteon Montfort, 1810 in the southwest Pacific:σ, Acteon cf. nakayamai Habe, 1952 . Z, Acteon ionfasciatus n. sp.

°, Acteon chrystomatus n. sp.

The radular morphology of Rictaxis is very similar to that of Japonacteon (see above), but the radular teeth of Japonacteon are all of similar size, whereas in Rictaxis the outermost teeth are much more elongated. A revision of the Acteonidae with a phylogenetic analysis is necessary to determine the validity of these names, but in the meanwhile Rictaxis is here used as valid.

Kingdom

Animalia

Phylum

Mollusca

Class

Gastropoda

Family

Acteonidae

Loc

Rictaxis

Valdés, Ángel 2008
2008
Loc

Rictaxis

DALL W. H. 1871: 136
1871
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