Madagasikara spinosa

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Madagasikara spinosa
Madagasikara spinosa shell.png
drawing of apertural view of Madagasikara spinosa
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]
  • Pirena spinosa Lamarck, 1822
  • Melanopsis spinosa
  • Pirena (Melanatria) spinosa
  • Melanatria spinosa
  • Melanopsis lamarckii Potiez & Michaud, 1838
  • Pirena lamarckii
  • Pirena fluminea Reeve, 1859[3]
  • 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]


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]


Shells of Madagasikara spinosa.

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]


It lives in fast running streams.[4]

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


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