trigonian.
/trʌɪˈɡəʊnɪə/ Conchology.
A genus of bivalve molluscs having a shell of triangular form.
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the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > class Pelecypoda or Conchifera > [noun] > section Asiphonida > family Trigoniadae > genus Trigonia
trigonia1837
1837 Encycl. Brit. XV. 343/1 The trigonia now forms along with castalia, the small family of Trigonées.
1851 S. P. Woodward Man. Mollusca i. 11 The cockle and trigonia have the foot bent, enabling them to make short leaps.
1883 Official Catal. Internat. Fisheries Exhib. (ed. 4) 176 Collection of Trigonias..exhibited by Dr. J. C. Cox, F.L.S. of Sydney.
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trigoniacean n. /traɪɡəʊnɪˈeɪʃ(ɪ)ən/ (a) adj. belonging to the group Trigoniacea of bivalve molluscs, typified by the genus Trigonia; (b) n. a mollusc of this group. (In recent dictionaries.)
/traɪɡəʊnɪˈeɪʃ(ɪ)ən/ (a) adj. belonging to the group Trigoniacea of bivalve molluscs, typified by the genus Trigonia; (b) n. a mollusc of this group. (In recent dictionaries.)This entry has not yet been fully updated (first published 1914; most recently modified version published online June 2020).
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n.1837