Trigonulina

Trigonulina d'Orbigny, 1853 is a genus of small carnivorous bivalves in the family Verticordiidae. 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. Trigonulina shells are known to be extremely small, ranging from about 1-3.6 millimeters long. 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. T. ornata lives in the western Atlantic Ocean while T. novemcostata is native to the South China Sea.

Species

 * Trigonulina novemcostata (A. Adams & Reeve, 1850)
 * Trigonulina ornata (d'Orbigny, 1853)