One of the mysteries of the English language finally explained.
Apparently but not actually tetramerous; (Entomology) designating tarsi with five segments which appear as four, the fourth segment being very small and hidden between the lobes of the third; (of a beetle) having such tarsi (obsolete rare).
Mid 19th century; earliest use found in John Westwood (1805–1893), entomologist and palaeographer. From pseudo- + tetramerous, after scientific Latin Pseudotetramera, former division name.
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