Madagasikara spinosa

Madagasikara spinosa is a species of tropical freshwater snail with a gill and an operculum, an aquatic gastropod mollusc in the family Pachychilidae.[3]

Madagasikara spinosa
Madagasikara spinosa

Near Threatened  (IUCN 3.1)[1]
Scientific classification
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Gastropoda
(unranked):
clade Caenogastropoda
clade Sorbeoconcha
Superfamily:
Cerithioidea
Family:
Pachychilidae
Genus:
Madagasikara
Species:
M. spinosa
Binomial name
Madagasikara spinosa
(Lamarck, 1822)[2]
Synonyms[3]
  • Pirena spinosa Lamarck, 1822
  • Melanopsis spinosa
  • Pirena (Melanatria) spinosa
  • Melanatria fluminea (Gmelin, 1791)
  • Melanatria spinosa
  • Melanopsis lamarckii Potiez & Michaud, 1838
  • Pirena lamarckii
  • Pirena fluminea Reeve, 1859[4]
  • Melanatria fluminea
  • Pirena maura Reeve, 1859
  • Pirena lingulata Reeve, 1859
  • Pirena aspera Brot, 1862
  • Melanatria goudotiana Brot, 1879 in Brot, 1874-79

Madagasikara spinosa is the type species of the genus Madagasikara.[3]

Distribution

This species is endemic to Madagascar.[3] It was recorded in East Madagascar and in surrounding islands such as Île Sainte-Marie.[3]

The type locality is "Dans le rivières de l’ile de Madagascar", in rivers of Madagascar.[3]

Description
Shells of Madagasikara spinosa.

The shell is elongate and large and it has 5.0-11.0 whorls.[3] The color of the shell is from brown to black.[3] The apex is truncated.[3] There are axial ribs especially on upper whorls.[3] The aperture is widely oval with palatal and basal sinus.[3]

The width of the shell is 9.9-28.3 mm.[3] The height of the shell is 25.2-69.5 mm.[3] The width of the aperture is 5.0-18.4 mm.[3] The height of the aperture is 8.0-23.1 mm.[3]

The operculum is oval and black.[3]

The color of the animal is dark grey to black with yellowish dots.[3] Tentacles are quite long.[3] Radula is taeniglossate.[3] Radula is about 16 mm long with about 127 rows of teeth.[3]

Ecology

It lives in fast running streams.[3]

Sexes are separate (gonochorism).[3] Females lays eggs (oviparous).[3]

References
  1. Van Damme, D. (2016). "Madagasikara spinosa". The IUCN Red List of Threatened Species. IUCN. 2016: e.T91353068A91353128. doi:10.2305/IUCN.UK.2016-3.RLTS.T91353068A91353128.en. Retrieved 9 December 2017.
  2. Lamarck J. B. (1822). Histoire naturelle des animaux sans vertèbres. Paris, J. B. Baillière. page 172.
  3. Köhler, F. & Glaubrecht, M. (2010). "Uncovering an overlooked radiation: molecular phylogeny and biogeography of Madagascar’s endemic river snails (Caenogastropoda: Pachychilidae: Madagasikara gen. nov.). Biological Journal of the Linnean Society 99: 867-894. doi:10.1111/j.1095-8312.2009.01390.x
  4. Reeve L. A. (1859). Pirena. In: Reeve L. A. (ed.) Conchologia iconica. London, Reeve. 12: plate 2, figure 6-7, figure 9-10.
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