Pseudodaphnella alternans

Pseudodaphnella alternans is a species of sea snail, a marine gastropod mollusk in the family Raphitomidae.[1]

Pseudodaphnella alternans
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Clade: Caenogastropoda
Clade: Hypsogastropoda
Clade: Neogastropoda
Superfamily: Conoidea
Family: Raphitomidae
Genus: Pseudodaphnella
Species:
P. alternans
Binomial name
Pseudodaphnella alternans
(E. A. Smith, 1882)
Synonyms[1]

Pleurotoma (Defrancia ?) alternans E. A. Smith, 1882 (original combination)

Description

The length of the shell attains 6 mm, its diameter 2.5 mm.

The ovate shell contains probably 7 whorls (the apex is missing). The 5 remaining whorls are slightly convex and contain 12 longitudinal ribs (continuing to the base of the body whorl). The spiral lirae form small nodules when crossing the ribs (4 in the penultimate whorl, 10 in the body whorl) and are very cancellate. The aperture is very narrow and measures about 3/7 of the total length. The outer lip is incrassate with about 6 denticules within and is somewhate sinuate at the top. The siphonal canal is narrow, short and truncate.

The colouring of this species is very remarkable. In the upper whorls the ribs are alternately brown and white, and the lowest liration, which is in conjunction with the suture and encircles the middle of the body whorl, is wholly white. The fifth and sixth lirations on the last, reckoning from the suture, are rather far apart, and the longitudinal ribs between them are uniformly brown. [2]

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References
  1. MolluscaBase (2019). MolluscaBase. Pseudodaphnella alternans (E. A. Smith, 1882). Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=596309 on 2019-11-11
  2. Smith E.A. (1882). Diagnoses of new species of Pleurotomidae in the British Museum. Annals and Magazine of Natural History. ser. 5, 10: 296-306
  • Tucker, J.K. (2004). "Catalog of recent and fossil turrids (Mollusca: Gastropoda)" (PDF). Zootaxa. 682: 1–1295.
  • Kilburn, R. N. (2009). Genus Kermia (Mollusca: Gastropoda: Conoidea: Conidae: Raphitominae) in South African Waters, with Observations on the Identities of Related Extralimital Species. African Invertebrates. 50(2): 217-236
  • Li B.-Q. [Baoquan & Li X.-Z. [Xinzheng] (2014) Report on the Raphitomidae Bellardi, 1875 (Mollusca: Gastropoda: Conoidea) from the China Seas. Journal of Natural History 48(17-18): 999-1025]
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