Amphithalamus sundayensis

Amphithalamus sundayensis
Shell of Amphithalamus sundayensis
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Caenogastropoda
Order:	Littorinimorpha
Family:	Anabathridae
Genus:	Amphithalamus
Species:	A. sundayensis
Binomial name
Amphithalamus sundayensis W. R. B. Oliver, 1915
Synonyms [1]
Amphithalamus (Notoscrobs) sundayensis(W. R. B. Oliver, 1915) alternative representation

Amphithalamus sundayensis is a species of minute sea snails, marine gastropod molluscs or micromolluscs in the family Anabathridae. ^[1]

Description

The length of the shell attains 1.2 mm, its diameter 0.6 mm.

(Original description) The shell is minute and ovate, with a blunt apex. It features four flattened whorls and an impressed suture. The aperture is detached, broadly elliptical, and slightly angled behind. The peristome is thickened, and a ridge connects its posterior end with the body whorl. The umbilical furrow is wide.

The whole shell appears quite smooth. Its colour is light olive-brown, with the suture, peristome, and lower part of the body whorl being darker. ^[2]

Distribution

This species is endemic to New Zealand and occurs off the Kermadec Islands.

References

1. Amphithalamus sundayensis W. R. B. Oliver, 1915) . 24 May 2025. Retrieved through: World Register of Marine Species .
2. Oliver, W.R. (1915). "Mollusca of the Kermadec Isl". Transactions and Proceedings of the New Zealand Institute. 47: 521. Retrieved 24 May 2025. This article incorporates text from this source, which is in the public domain .

• Spencer, H.G., Marshall, B.A. & Willan, R.C. (2009). Checklist of New Zealand living Mollusca. Pp 196-219. in: Gordon, D.P. (ed.) New Zealand inventory of biodiversity. Volume one. Kingdom Animalia: Radiata, Lophotrochozoa, Deuterostomia. Canterbury University Press, Christchurch.