Century Dictionary and Cyclopedia
- In conchology, having valves equal in size and form, as a bivalve mollusk. Also equivalvular. Synonyms See
- n. A bivalve shell in which the valves are of equal size and form.
- adj. zoology Having valves of the same size (as is normal)
- n. Any bivalve mollusc whose valves are of the same size.
GNU Webster's 1913
- adj. (Zoöl.) Having the valves equal in size and from, as in most bivalve shells.
“The shell is equivalve, and nearly equilateral; the anterior hinge tooth is in the form of an inverted A; lateral teeth doubled in the right valve.”
“Shell regular, equivalve oval or elongated; valve close, solid; epidermis thick and dark; ligament external, conspicuous cardinal teeth 1 -- 3 in each valve; pedal scars close to or confluent with the adductors; pallial line simple.”
“Shell large, circular, compressed, thin, pearly; equivalve equilateral; concentrically marked by fine lines of growth; on the outside, ribs are invisible; inside, ornamented by about eighteen pairs of ribs, which are prominent at the margin, and obsolete towards the hinge.”
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