Angustassiminea vulgaris

Angustassiminea vulgaris
Shell of Angustassiminea vulgaris (specimen at the Natural History Museum, Rotterdam)
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Caenogastropoda
Order:	Littorinimorpha
Family:	Assimineidae
Genus:	Angustassiminea
Species:	A. vulgaris
Binomial name
Angustassiminea vulgaris (W. H. Webster, 1905)
Synonyms [1]
List Assiminea vulgaris(W. H. Webster, 1905) superseded combination Rissoia vulgarisWebster, 1905 Rissoa (Setia) vulgaris(Webster). Suter, 1913 Notosetia vulgaris(Webster). Iredale, 1915[ citation needed ] Tatea hedleyiBrookes, 1924

Angustassiminea vulgaris is a species of minute salt marsh snail with an operculum, an aquatic gastropod mollusk in the family Assimineidae. ^[2]

Description

The length of the shell attains 2.5 mm, its diameter 1.7 mm.

(Described as Tatea hedleyiBrookes, 1924) The small, conical shell is elongate. It is pale buff in colour, with narrow ochraceous bands below the suture. It has a rounded protoconch, and it is without any perceptible sculpture except for a few faint growth-lines. It has 5½ convex whorls, with rather deeply impressed sutures. The protoconch is depressed and consists of one whorl. The spire is about 1½ times the height of the aperture. The body whorl is more than half the height of all the preceding whorls taken together. The aperture is ovate, angled above, and has a rounded, descending base. The peristome is discontinuous, with the margins united by a thin parietal callus. The basal lip is thickened, while the outer lip is thin. The columella is short and rounded. The umbilicus consists of a narrow chink. The operculum is thin, horny, transparent, and paucispiral. The nucleus is subcentral, slightly raised, and nearer the base, upon which are several broad, shallow grooves. ^[3]

Radula

The dental formula of the stenoglossan [[radula]] of Angustassiminea vulgaris is 1 + 1 + 1 + 1 + 1 + 1 + 1. The central tooth has five cusps, and three denticles on each side, below. The inner lateral tooth has six cusps and the outer lateral tooth five. The marginal teeth show 15 pectinate cusps.

References

1. Transactions and Proceedings of the Royal Society of New Zealand 1868-1961, volume 63, 1934
2. Angustassiminea vulgaris (W. H. Webster, 1905) . 3 December 2025. Retrieved through: World Register of Marine Species .
3. Brookes, A.E. (1924). "Descriptions of two new species of gasteropod shells" (PDF). ransactions of the New Zealand Institute. 55: 153. Retrieved 3 December 2025. This article incorporates text from this source, which is under a CC BY 4.0 license.

• Webster, W. H. (1905). Some new species of New Zealand marine shells, together with remarks on some non-marine species, and some additions to the “Index faunae. Transactions and Proceedings of the New Zealand Institute. 37: 276-280.
• Powell A. W. B., New Zealand Mollusca, William Collins Publishers Ltd, Auckland, New Zealand 1979 ISBN   0-00-216906-1
• Fukuda H. (2019). Assimineidae H. & A. Adams, 1856. Pp. 94-100, in: C. Lydeard & C.S. Cummings (eds), Freshwater mollusks of the world. A distribution atlas. 242 pp. Baltimore: Johns Hopkins University Press.