Trigonia


Also found in: Wikipedia.

Tri`go´ni`a


n.1.(Zool.) A genus of pearly bivalve shells, numerous extinct species of which are characteristic of the Mesozoic rocks. A few living species exist on the coast of Australia.
References in classic literature ?
For instance, a single species of Trigonia, a great genus of shells in the secondary formations, survives in the Australian seas; and a few members of the great and almost extinct group of Ganoid fishes still inhabit our fresh waters.
Los individuos fueron criados individualmente y alimentados con diferentes plantas hospederas (Annona purpurea, Cordia alliodora, Inga vera, Quercus oleoides, Paullinia cururu, Cydista heterophylla, Trigonia rugosa y Calycophyllum candidissimum), para determinar si el tipo de dieta ejercia alguna influencia sobre la microbiota intestinal.
Fossils that outline the shapes of a Trigonia clam and an echinoid were also taken from the pit.
de Madagascar, tambien monotipico y dos generos mas en el neotropico; Trigonia Aubl.
tonduzii are the totals for Trigonia fulviventris, the single abundant pollinator species observed, and represent a single flowering period (8 days of observation, 38 h total, during peak flowering).
The staminodialia type of nectaries (or Trigonia type) correspond with staminodes that are more strongly associated with the androecium.
Trechmann (1927) describe ejemplares muy parecidos en Jamaica, de tamano mas pequeno y con ornamentacion de costillas en forma de V cerca del umbon, como pertenecientes al genero Trigonia.
Cuenta con 22 sitios arqueologicos y prehistoricos, entre ellos, San Juan Raya, que aloja una innumerable cantidad de fosiles marinos porque esa region fue un mar poco profundo hace mas de 110 millones de anos; a cielo abierto existen miles de fosiles de esponjas, trigonias, estrellas de mar, turrielas, erizos, nerineas, moluscos y amontes, ademas de huellas de dinosaurios.
Perez y Reyes (1977) estudiaron las Trigonias Jurasicas de Chile y su valor cronoestratigrafico.