from The Century Dictionary.
- In conchology, having valves equal in size and form, as a bivalve mollusk. Also
- noun A bivalve shell in which the valves are of equal size and form.
from the GNU version of the Collaborative International Dictionary of English.
- adjective (Zoöl.) Having the valves equal in size and from, as in most bivalve shells.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- adjective zoology Having
valvesof the same size (as is normal)
- noun Any bivalve mollusc whose valves are of the same size.
Sorry, no etymologies found.
"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.