extinct genus of pelecypods (clams) found as fossils in Silurian to Lower Carboniferous rocks (between 438 and 320 million years old). Its distinct shell, roughly oval except for a sharp outgrowth that extends posteriorly, makes Leptodesma easy to identify. A troughlike flange connects the spinous outgrowth to the main body of the shell. Concentric growth lines are also present.
LEPTODESMA
Meaning of LEPTODESMA in English
Britannica English vocabulary. Английский словарь Британика. 2012