Amalda marginata
| Amalda marginata | |
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_-_Olividae_-_Mollusc_shell.jpeg)
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Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Caenogastropoda |
| Order: | Neogastropoda |
| Family: | Ancillariidae |
| Genus: | Amalda |
| Species: | A. marginata
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| Binomial name | |
| Amalda marginata (Lamarck, 1811)
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| Synonyms | |
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Amalda marginata is a species of sea snail, a marine gastropod mollusk in the family Ancillariidae.[1]
Description
[edit]The length of the shell attains 40 mm, its diameter 19 mm.
(Original description in French) It is an oval, rounded shell with a pointed, transversely keeled spire. It is whitish with a smooth back, but its whorls are decorated near their suture with an interrupted reddish band. The outer lip of its aperture is equipped with a small protruding denticle at the bottom.[2]
(Described as Baryspira (Alocospira) dyspetes) The shell is medium-sized with an open aperture and a slightly swollen shape. The spire is very short and tapered. The shell is primarily white, with a yellow band just behind the suture and a similarly colored anterior canal. The apex consists of two rounded whorls, followed by five nearly smooth adult whorls, with only a faint, central spiral ridge visible. The base of the shell displays about six shallow grooves. The inner lip is covered with a thin glaze that extends beyond the aperture onto the previous whorl.[3]
(Described as Ancillaria marginata var. tasmanica) The shell is ovate-fusiform, solid, with a pyramidal spire shorter than the aperture. It is covered with two spiral keels. The shell is entirely white. The whorls are rounded and bordered above by a white callous band. The front of the body whorl is decorated with such bands in the following order —first with two equidistant spiral grooves, then with a thick, broad, rounded varix, followed by a broad, flattened band, and finally 4-5 spiral folds. The inner lip is somewhat sharp and thin. The outer lip is callous at the back. The aperture is wide, with a broad notch at the base.[4]
Distribution
[edit]This marine species is endemic to Australia and occurs off New South Wales, South Australia, Tasmania, Victoria and Western Australia.
References
[edit]- ^ Amalda marginata (Lamarck, 1811). Retrieved through: World Register of Marine Species on 28 April 2010.
- ^ Lamarck, J.B.M. de (1811). "Suite de la détermination des espèces de Mollusques testacés. Tarrière (Terebellum), Ancillaire (Ancillaria), Olive (Oliva)". Annales du Muséum National d'Histoire Naturelle. 16: 304. Retrieved 13 November 2024.
- ^ Iredale, T. (1929). "Strange molluscs in Sydney Harbour". Australian Zoologist. 5 (4): 341.
This article incorporates text from this source, which is in the public domain.
- ^ Tenison Woods, J.E. (1877). "On some new Tasmanian marine shells. (Second series)". Papers and Proceedings and Report of the Royal Society of Tasmania. 1876: 135. This article incorporates text from this source, which is in the public domain.
External links
[edit]- Gemmell, Michael R.; Trewick, Steven A.; Hills, Simon F. K.; Morgan-Richards, Mary (2019). "Phylogenetic topology and timing of New Zealand olive shells are consistent with punctuated equilibrium". Journal of Zoological Systematics and Evolutionary Research. 58 (1): 209–220. doi:10.1111/jzs.12342.
