Pinna (bivalve)

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Pinna
Temporal range: Carboniferous–Recent [1]
Pinnidae - Pinna nobilis-001.jpg
Pinna nobilis
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Bivalvia
Order: Pteriida
Superfamily: Pinnoidea
Family: Pinnidae
Genus: Pinna
Linnaeus, 1758
Type species
Pinna rudisLinnaeus, 1758
Synonyms
  • ExitopinnaIredale, 1939
  • Pinna (Abyssopinna)P. W. Schultz & M. Huber, 2013· accepted, alternate representation
  • Pinna (Cyrtopinna)Mörch, 1853· accepted, alternate representation
  • Pinna (Exitopinna)Iredale, 1939· accepted, alternate representation
  • Pinna (Pinna)Linnaeus, 1758· accepted, alternate representation
  • Pinna (Quantulopinna)Iredale, 1939· accepted, alternate representation
  • Pinna (Subitopinna)Iredale, 1939· accepted, alternate representation
  • PinnariusDuméril, 1805
  • PinnulaRafinesque, 1815
  • QuantulopinnaIredale, 1939
  • SubitopinnaIredale, 1939

Pinna is a genus of bivalve molluscs belonging to the family Pinnidae. [2] [3] The type species of the genus is Pinna rudis . [2]

Contents

The most extensively studied species in the genus is P. nobilis , a Mediterranean pen shell which was historically important as the principal source of sea silk.

Description

Pinna noblis shell & byssus. Pinna noblis shell & byssus.JPG
Pinna noblis shell & byssus.
Shell. Pinna 03.jpg
Shell.

These pen shells can reach a length of about 80–90 cm (31–35 in). They are characterized by thin, elongated, wedge-shaped, and almost triangular shells with long, toothless edges. The surface of the shells shows radial ribs over their entire length.

Pinna is distinguished from its sibling genus Atrina by the presence of a sulcus dividing the nacreous region of the valves, and the positioning of the adductor scar on the dorsal side of shells.

These bivalves most commonly lie point-first on the sea bottom in which they live, anchored by a net of byssus threads.

Distribution

Species in the genus Pinna are geographically widespread. [3] This genus is very ancient, going back up to the Carboniferous period. It is especially represented in Jurassic and Cretaceous fossils. [1]

Species

According to the World Register of Marine Species, extant species in the genus Pinna are: [2]

The following species are only known from the fossil record: [2]

Nomen nudum

Nomen dubium

Synonyms

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References

  1. 1 2 "Pinna Linnaeus, 1758". Paleobiology Database. Retrieved 17 September 2024.
  2. 1 2 3 4 Bieler R, Bouchet P, Gofas S, Marshall B, Rosenberg G, La Perna R, Neubauer TA, Sartori AF, Schneider S, Vos C, ter Poorten JJ, Taylor J, Dijkstra H, Finn J, Bank R, Neubert E, Moretzsohn F, Faber M, Houart R, Picton B, Garcia-Alvarez O, eds. (2024). "Pinna Linnaeus, 1758". MolluscaBase. World Register of Marine Species . Retrieved 17 September 2024.
  3. 1 2 "Pinna Linnaeus, 1758". Global Biodiversity Information Facility . Retrieved 17 September 2024.
  4. ↑ Shilekhin, L. E.; Mazaev, A. V.; Biakov, A. S. (2023). "The most ancient representatives of the genus Pinna (Bivalvia) in the Early Permian reef of Shakhtau (southern Cis-Urals, Russia)". Paleontological Journal. 57 (4): 21–25. doi:10.1134/S0031030123040111.
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