Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Protostomia
Cladus: Spiralia
Cladus: Lophotrochozoa
Phylum: Mollusca
Classis: Gastropoda
Subclassis: Heterobranchia
Infraclassis: Euthyneura
Cohors: Tectipleura
Subcohors: Panpulmonata
SuperOrdo: Eupulmonata
Ordo: Stylommatophora
SubOrdo: Achatinina
Superfamilia: Streptaxoidea
Familia: Streptaxidae
Subfamilia: Orthogibbinae
Genus: Careoradula
Species: C. perelegans
Careoradula perelegans is a species of air-breathing land snail, terrestrial pulmonate gastropod mollusk in the family Streptaxidae.[2][4]
Careoradula perelegans is the only species in the genus Careoradula.[2]
The generic name Careoradula consist of Latin word "careo", that means "lacking" and the word radula.[2]
Distribution
Careoradula perelegans is endemic to the Seychelles.[2][4]
Description
The shape of the shell is discoidal.[2] The shell has 6-8 whorls.[2] there are regular ribs on the shell.[2] The umbilicus is open.[2]
The width of the shell is 4.4-6.1 mm.[2] The height of the shell is 1.9-3.1 mm.[2]
The body color is pale yellow.[2]
Digestive system: Careoradula perelegans is unique among other streptaxids, because it has no radula, no odontophore and no retractor muscles associated with these structures.[2][5] It is the first known terrestrial mollusc and first pulmonate gastropod without radula.[5] Instead of this, the Careoradula perelegans has strong muscular ridges between mouth and oesophagus.[5]
Ecology
Careoradula perelegans feeds on carrion.[5] It has been recorded to feed on dead snail Subulina octona.[5] It evert an extensive rostrum,[5] that is available in all carnivorous gastropods on the anterior part of the oesophagus,[5] and it uses only muscular peristaltics instead of rasping by radula.[5]
References
Gerlach J. (2006). Careoradula perelegans. In: IUCN 2010. IUCN Red List of Threatened Species. Version 2010.3. <www.iucnredlist.org>. Retrieved 5 October 2010.
Gerlach J. & Bruggen A. C. van (1999). "Streptaxidae Mollusca: Gastropoda: Pulmonata) of the Seychelles Islands, western Indian Ocean". Zoologische Verhandelingen 328: 1-60. page 47. abstract, PDF.
Martens E. von & Wiegmann F. (1898). "Land- und Süsswasser-Mollusken der Seychellen nach den Sammlungen von Dr. Aug. Brauer". Mitteilungen aus der Zoologischen Sammlung des Museums für Naturkunde in Berlin 1: 1-94. page 12-13, plate 2, figure 6.
Sutcharit C., Naggs F., Wade C. M., Fontanilla I. & Panha S. (2010). "The new family Diapheridae, a new species of Diaphera Albers from Thailand, and the position of the Diapheridae within a molecular phylogeny of the Streptaxoidea (Pulmonata: Stylommatophora)". Zoological Journal of the Linnean Society 160: 1-16. doi:10.1111/j.1096-3642.2009.00598.x.
Gerlach J. & van Bruggen A. C. (1998). "A first record of a terrestrial mollusc without a radula". Journal of Molluscan Studies 64(2): 249-250. doi:10.1093/mollus/64.2.249.
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