Penion chathamensis

Penion chathamensis is a species of very large predatory sea snail or whelk, a marine gastropod mollusc in the family Buccinidae, the true whelks.

Penion chathamensis
A shell of Penion chathamensis
Scientific classification
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Gastropoda
(unranked):
clade Caenogastropoda
clade Hypsogastropoda
clade Neogastropoda
Superfamily:
Buccinoidea
Family:
Buccinidae
Genus:
Penion
Species:
P. chathamensis
Binomial name
Penion chathamensis
(Powell, 1938)
Synonyms

Penion fairfieldae (Powell, 1947)[1]

Description

Penion chathamensis is a very large species of Penion siphon whelk.[2] Although P. chathamensis has separate sexes, the species does not appear to exhibit secondary sexual dimorphism in shell shape or size.[3]

A separate species, Penion fairfieldae was formerly recognised, but recent genetic data has demonstrated that the species is indistinguishable from Penion chathamensis.[1] Shells originally recognised as P. fairfieldae can be distinguished from P. chathamensis using shell size, but not using shell shape.[1]

Distribution

Penion chathamensis is endemic to New Zealand.[2][3][4] The species is distributed off of the west coast of the South Island, and occurs on Chatham Rise and in waters surrounding the Chatham Islands[2][3][4] The latter location is the type locality, giving rise to the binomial name of the species.[2]

References
  1. Vaux, Felix; Gemmell, Michael R.; Hills, Simon F.K.; Marshall, Bruce A.; Beu, Alan G.; Crampton, James S.; Trewick, Steven A.; Morgan-Richards, Mary (2020). "Lineage Identification Affects Estimates of Evolutionary Mode in Marine Snails". Systematic Biology. 69 (6): 1106–1121. doi:10.1093/sysbio/syaa018.
  2. Powell A. W. B., New Zealand Mollusca, William Collins Publishers Ltd, Auckland, New Zealand 1979 ISBN 0-00-216906-1
  3. Vaux, Felix; Crampton, James S.; Marshall, Bruce A.; Trewick, Steven A.; Morgan-Richards, Mary (2017). "Geometric morphometric analysis reveals that the shells of male and female siphon whelks Penion chathamensis are the same size and shape". Molluscan Research. 37 (3): 194–201. doi:10.1080/13235818.2017.1279474.
  4. Vaux, Felix; Hills, Simon F.K.; Marshall, Bruce A.; Trewick, Steven A.; Morgan-Richards, Mary (2017). "A phylogeny of Southern Hemisphere whelks (Gastropoda: Buccinulidae) and concordance with the fossil record". Molecular Phylogenetics and Evolution. 114 (2017): 367–381. doi:10.1016/j.ympev.2017.06.018. PMID 28669812.


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