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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.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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.
cons.--Type: Trigonia Aubl., 1775.--Validated by a description in French.
Fossils that outline the shapes of a Trigonia clam and an echinoid were also taken from the pit.
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.