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Taxon profile

genus

Anomphalogaza Hickman, 2012

kingdom Animalia - animals »  phylum Mollusca - mollusks »  class Gastropoda - gastropods »  order Trochida »  family Margaritidae

Type taxon:Anomphalogaza moluccensis Hickman, 2012

Description

Shell lacking umbilicus, shell height (up to 29.2 mm) exceeding shell width (up to 22.1 mm). Interior nacreous layer thickest, covered by two distinct, unpigmented outer layers. No evidence of opalescent sheen from underlying nacreous layer. Nacreous layer, as well as outer layers, thickened and reflexed at terminal aperture. Terminal aperture descending. Nacreous parietal callus divided into two portions, one on upper parietal wall immediately below upper termination of outer lip and other on lowermost parietal wall and connected to columellar callus. Thin, transparent shell layer of unidentified composition superimposed as secondary callus on underlying columellar and parietal callus and continuous across parietal wall. Final whorl sculpture consisting of 130 closely-spaced, very finely-incised spiral lines crossed by fine closely-spaced collabral growth lines, visible only with magnification. Suture slightly adpressed to preceding whorl throughout coiling.
Source Hickman, 2012; A new genus and two new species of deep-sea gastropods (Gastropoda: Vetigastropoda: Gazidae).

Interchangeable taxa

The thickened and reflexed outer lip is a unique shared feature of all species of Gazidae. It is accompanied by a descending suture immediately prior to formation of the terminal lip. Both features are indicative of determinate growth. The thin parietal and columellar callus may also be terminal features, but younger individuals will be required to determine if this is the case.
The genus is distinguished from Gaza and Callogaza by die absence of an umbilicus by and relatively greater shell height. Height exceeds width, and the generating curve is tangent to the axis of coiling, precluding the presence of umbilical space. It is further distinguished from Callogaza by larger adult size (>20 mm), lack of pigmentation, and the absence both ol axial sculpture and any strong spiral elements or peripheral demarcation. Shells lack the lustrous sheen typical of both Gaza and Callogaza. The suture is slightly adpressed to the preceding whorl in contrast to the impressed suture in species of Gaza, and the aperture is less prosocline.
Author: Jan Delsing

Included taxa

Number of records: 1

species Anomphalogaza moluccensis Hickman, 2012

Anomphalogaza moluccensis


Links and literature

EN The Interim Register of Marine and Nonmarine Genera [1467688]

Rees, T. (compiler): The Interim Register of Marine and Nonmarine Genera [https://www.irmng.org] [as Anomphalogaza Hickman, 2012]
Data retrieved on: 30 November 2019

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