unionoid
Word Rarity
Very rare
Frequency: Zipf frequency 0.00 in modern English
9
Scrabble Score
8
Letters
1
Syllables
5
Unique Chars
Meaning
adj
Relating to, resembling or characteristic of the family Unionidae or its order Unionida of freshwater mussels.
Example Sentences
- "II. n. Same as unionid."
- "Carbonicola, of the Devonian and Carboniferous, comprises Unionoid Bivalves, with thick shells, an external ligament, and a concentrically-striated surface."
- "I know nothing of that of Solenaia beyond the statement of Fischer regarding its greatly developed, mushroom shaped foot and its burrowing habit. It is, I am satisfied, an unionoid animal and the fact that there is a decided posterior pallial sinus to the shell leads me to believe that it has two siphons."
- "The current record of Australian Lower Cretaceous non-marine macroinvertebrates is substantial but mainly limited to a few highly productive localities. Some remains have been recovered from near-shore marine rocks including the Valanginian Trinity Well Sandstone Member of the Cadna-owie Formation (South Australia) and the Aptian Wallumbilla Formation (White Cliffs, New South Wales). These have produced freshwater unionoid bivalves (Alathyria coatsi, Hyridella whitecliffsensis) and Australia’s oldest known non-marine gastropod – the viviparid Notopala alboscopularis."
Etymology
From taxonomic name Unio (with insertion of -n- after its etymon, Classical Latin ūniō (stem ūniōn-)) + -oid. Compare earlier unionid and taxonomic name Unionioda.