Trigonulina

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Trigonulina
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Bivalvia
Family: Verticordiidae
Genus: Trigonulina
d'Orbigny, 1853
Synonyms [1]
  • Verticordia (Trigonulina) d'Orbigny, 1853

Trigonulina is a genus of small carnivorous bivalves in the family Verticordiidae. [1] [2] It was first named by Alcide d'Orbigny with the type taxon T. ornata in 1853, though T. novemcostata was named first originally as Hippagus novemcostatus in 1850 which is now unaccepted. [3] Trigonulina shells are known to be extremely small, ranging from about 1-3.6 millimeters long. [2] They live at depths of 18-850 meters below the ocean's surface and burrow under sand to feed on microscopic crustaceans using adapted inhalant siphons. [2] T. ornata lives in the western Atlantic Ocean [2] while T. novemcostata is native to the South China Sea. [3]

Species

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Trigonulina novemcostata is a carnivorous bivalve in the family Verticordiidae. It is native to the South China Sea with 7–8 prominent ribs on its surface and ranges from about 0.7-5 millimeters in size in accordance with the unaccepted genus Hippagus it was originally described as. It is the only currently known species in the genus Trigonulina that lives outside of the western Atlantic Ocean, being found in the South China Sea and Pacific Ocean. This species has been observed between California and Peru as well as in Costa Rica. Malacologists currently debate if T. novemcostata is a separate species or a variant of T. ornata due to their similar appearances and habitat overlap.

Trigonulina ornata, commonly known as the "'Ornate verticord", is a carnivorous bivalve in the family Verticordiidae. It is native to coastal waters throughout the western Atlantic Ocean at depths of 18-850 meters below the surface. It has 8-11 prominent ribs on its surface and can be a maximum of 5.6 millimeters in size, though on average ranges from 1-3.6 millimeters.

References

  1. 1 2 "Trigonulina". WoRMS. World Register of Marine Species . Retrieved 20 January 2023.
  2. 1 2 3 4 Morton, Brian; Machado, Fabrizio Marcondes; Passos, Flávio Dias (2019-12-01). "The anatomy of the miniature predator Trigonulina ornata d'Orbigny, 1853 (Bivalvia: Anomalodesmata: Verticordiidae) from continental shelf waters off Brazil". Marine Biodiversity. 49 (6): 2901–2916. Bibcode:2019MarBd..49.2901M. doi:10.1007/s12526-019-01017-y. ISSN   1867-1624. S2CID   208020640.
  3. 1 2 3 "Trigonulina novemcostata". WoRMS. World Register of Marine Species . Retrieved 20 January 2023.
  4. "Trigonulina ornata". WoRMS. World Register of Marine Species . Retrieved 20 January 2023.