testaceous(a = adj.pert) - relating to or possessing a testa or hard shell; "testaceous fish"
Derived form noun testa1
1. Of or pertaining to shells; consisted of a hard shell, or having a hard shell. [1913 Webster]
2. Having a dull red brick color or a brownish yellow color. [1913 Webster]
testaceous, adj.
1 Biol. having a hard continuous outer covering.
2 Bot. & Zool. of a brick-red colour.
Etymology:
L testaceus (as TEST(2))