Madagasikara spinosa

Madagasikara spinosa
	Madagasikara spinosa
Conservation status
	; Near Threatened (IUCN 3.1)
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)
Synonyms
	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; 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 a species of tropical freshwater snail with a gill and an operculum, an aquatic gastropod mollusc in the family Pachychilidae.^[4]

Madagasikara spinosa is the type species of the genus Madagasikara.^[4]

Distribution

This species is endemic to Madagascar.^[4] It was recorded in East Madagascar and in surrounding islands such as Île Sainte-Marie.^[4]

The type locality is "Dans le rivières de l’ile de Madagascar", in rivers of Madagascar.^[4]

Description

The shell is elongate and large and it has 5.0-11.0 whorls.^[4] The color of the shell is from brown to black.^[4] The apex is truncated.^[4] There are axial ribs especially on upper whorls.^[4] The aperture is widely oval with palatal and basal sinus.^[4]

The width of the shell is 9.9-28.3 mm.^[4] The height of the shell is 25.2-69.5 mm.^[4] The width of the aperture is 5.0-18.4 mm.^[4] The height of the aperture is 8.0-23.1 mm.^[4]

The operculum is oval and black.^[4]

The color of the animal is dark grey to black with yellowish dots.^[4] Tentacles are quite long.^[4] Radula is taeniglossate.^[4] Radula is about 16 mm long with about 127 rows of teeth.^[4]

Ecology

It lives in fast running streams.^[4]

Sexes are separate (gonochorism).^[4] Females lays eggs (oviparous).^[4]

References

^ Van Damme, D. (2016). "Madagasikara spinosa". IUCN Red List of Threatened Species. 2016: e.T91353068A91353128. doi:10.2305/IUCN.UK.2016-3.RLTS.T91353068A91353128.en. Retrieved 14 November 2021.
^ Lamarck J. B. (1822). Histoire naturelle des animaux sans vertèbres. Paris, J. B. Baillière. page 172.
^ Reeve L. A. (1859). Pirena. In: Reeve L. A. (ed.) Conchologia iconica. London, Reeve. 12: plate 2, figure 6-7, figure 9-10.
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m ⁿ ^o ^p ^q ^r ^s ^t ^u ^v ^w 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

[iucn_status_14_November_2021-1] Van Damme, D. (2016). "Madagasikara spinosa". IUCN Red List of Threatened Species. 2016: e.T91353068A91353128. doi:10.2305/IUCN.UK.2016-3.RLTS.T91353068A91353128.en. Retrieved 14 November 2021.

[2] Lamarck J. B. (1822). Histoire naturelle des animaux sans vertèbres. Paris, J. B. Baillière. page 172.

[3] Reeve L. A. (1859). Pirena. In: Reeve L. A. (ed.) Conchologia iconica. London, Reeve. 12: plate 2, figure 6-7, figure 9-10.

[Köhler_2010-4] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m ⁿ ^o ^p ^q ^r ^s ^t ^u ^v ^w 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

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