from The Century Dictionary and Cyclopedia
- In entomology, curved so as to pass beneath the body: especially noting parts of the upper surface when they curve downward and inward at the sides.
Sorry, no etymologies found.
For example, the spiny lobsters (langoustes) were formerly all grouped in the genus Palinurus; this is usually said to have come from the name of Aeneas's navigator, but it could equally well be descriptive, referring to the undercurved tails of the creatures.
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