Penion chathamensis explained

Penion chathamensis is a species of very large predatory sea snail or whelk, a marine gastropod mollusc in the family Austrosiphonidae.^[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. Shells originally recognised as P. fairfieldae can be distinguished from P. chathamensis using shell size, but not using shell shape.^[4]

Distribution

Penion chathamensis is endemic to New Zealand.^[5] 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]} The latter location is the type locality, giving rise to the binomial name of the species.^[2]

External links

• Museum of New Zealand Te Papa Tongarewa, Taxon: Penion chathamensis Powell, 1938 (Species)
• Auckland War Memorial Museum: Penion chathamensis
• New Zealand Mollusca - Penion chathamensis (Powell, 1938)
• Natural History Museum Rotterdam - Mollusca - Gastropoda - Buccinidae

Notes and References

1. Kantor, Yuri I.. Fedosov, Alexander E.. Kosyan, Alisa R.. Puillandre, Nicolas. Sorokin, Pavel A.. Kano, Yasunori. Clark, Roger. Bouchet, Philippe. Molecular phylogeny and revised classification of the Buccinoidea (Neogastropoda). Zoological Journal of the Linnean Society. 2022. 194. 3. 789–857. 10.1093/zoolinnean/zlab031.
2. [Arthur William Baden Powell|Powell A. W. B.]
3. 10.1080/13235818.2017.1279474 . 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 . 2017 . Vaux . Felix . Crampton . James S. . Marshall . Bruce A. . Trewick . Steven A. . Morgan-Richards . Mary . 90288210 .
4. 10.1093/sysbio/syaa018 . Lineage Identification Affects Estimates of Evolutionary Mode in Marine Snails . Systematic Biology . 69 . 6 . 1106–1121 . 2020 . Vaux . Felix . Gemmell . Michael R. . Hills . Simon F.K. . Marshall . Bruce A. . Beu . Alan G. . Crampton . James S. . Trewick . Steven A. . Morgan-Richards . Mary . 32163159 .
5. 10.1016/j.ympev.2017.06.018 . A phylogeny of Southern Hemisphere whelks (Gastropoda: Buccinulidae) and concordance with the fossil record . Molecular Phylogenetics and Evolution. 114 . 2017 . 367–381 . 2017 . Vaux . Felix . Hills . Simon F.K. . Marshall . Bruce A. . Trewick . Steven A. . Morgan-Richards . Mary . 28669812 .