TESTACEOUS
testaceous
(adjective) relating to or possessing a testa or hard shell; “testaceous fish”
Source: WordNet® 3.1
Etymology
Adjective
testaceous (comparative more testaceous, superlative most testaceous)
(obsolete) Pertaining to earthenware or baked clay.
Having a shell, especially one which is not articulated.
Of a reddish-yellow or brownish colour, like brick.
Source: Wiktionary
Tes*ta"ceous, a. Etym: [L. testaceus, fr. testa a shell. See Testa.]
1. Of or pertaining to shells; consisted of a hard shell, or having a
hard shell.
2. (Bot. & Zoöl.)
Definition: Having a dull red brick color or a brownish yellow color.
Testaceous animals (Zoöl.), animals having a firm, calcareous shell,
as oysters and clams, thus distinguished from crustaceous animals,
whose shells are more thin and soft, and consist of several joints,
or articulations, as lobsters and crabs.
Source: Webster’s Unabridged Dictionary 1913 Edition