Macroschisma productum
| Macroschisma productum | |
|---|---|
| Top view of a shell of Macroschisma productum | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Vetigastropoda |
| Order: | Lepetellida |
| Family: | Fissurellidae |
| Subfamily: | Fissurellinae |
| Genus: | Macroschisma |
| Species: | M. productum
|
| Binomial name | |
| Macroschisma productum Adams, 1850
| |
| Synonyms[1] | |
Macroschisma productum, common name the elongated keyhole limpet, is a species of sea snail, a marine gastropod mollusk in the family Fissurellidae, the keyhole limpets and slit limpets.[1]
Description
The shell is elongated and narrowly oblong, elevated dorsally and convex, with flattened sides and a strongly sinuous margin. The apical opening (foramen) is very long, triangular, and expanded posteriorly.[2]
The shell is thin, whitish, and may be variegated with pale brown markings. Its surface shows fine radial striae crossed by faint concentric lines, producing an obsolete decussate sculpture.[3]
The anterior end is narrowed and produced, while the posterior extremity is rounded and elevated.[2]
SThe shell is very elongate and depressed posteriorly by a broad flat rib and may be drawn out into a beak-like point. The foramen is wide anteriorly and situated near the front margin.[4]
The shell resembles other members of the family Fissurellidae in having compressed sides and elevated extremities, but is distinguished by its marked posterior prolongation and unusually long opening.[4]
Distribution
This marine species occurs in southern Australia and the western Indian Ocean.[1]
In Australia it has been recorded from Port Lincoln, South Australia, including deep-water habitats.[3]
In Madagascar, it has been reported from Nosy Nasatrana, where specimens were collected on the beach.[5]
References
- ^ a b c Rosenberg, G. (2014). Macroschisma productum A. Adams, 1851. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=732499 on 2015-02-15
- ^ a b Adams, Arthur (1851). "A monograph of Macrochisma, a genus of gasteropodous mollusca belonging to the family Fissurellidae". Proceedings of the Zoological Society of London. 18: 202–203.
- ^ a b Tryon, George W.; Pilsbry, Henry A. (1890). Manual of Conchology; Structural and Systematic. Vol. 12. Philadelphia: Published by the Author, Academy of Natural Sciences. p. 194.
- ^ a b Sowerby, G. B. II (1862). Thesaurus Conchyliorum, or Monographs of Genera of Shells. Vol. 3. London: privately published. p. 205.
- ^ Dautzenberg, Philippe (1929). Mollusques testacés marins de Madagascar [Marine testaceous molluscs from Madagascar]. Faune des colonies françaises (in French). Vol. III. Paris: Société d'Éditions géographiques, maritimes et coloniales. p. 545.
External links
- Biodiversity Heritage Library (6 publications)
- World Register of Marine Species
- "Macroschisma producta". Gastropods.com. Retrieved 16 January 2019.