trilobite

/trahy-luh-bahyt/US // ˈtraɪ ləˌbaɪt //UK // (ˈtraɪləˌbaɪt) //

三叶虫,三叶草,叁叶虫

Definitions

n.名词 noun

1
- : any marine arthropod of the extinct class Trilobita, from the Paleozoic Era, having a flattened, oval body varying in length from 1 inch or less to 2 feet.

The appendages are not known, but the test is in some ways like that of a trilobite.
The arches of the ventral membrane in the trilobite … afford a correspondingly firm basis for the attachment of the legs.
Passing over the fact that the oldest isopod now known is Devonian, the fossils in question seem to me quite trilobite-like.
The coxopodite of the trilobite is not fused with the basipodite, this latter segment always remaining free.
The median eye has not so far been seen in any young trilobite in any stage previous to that in which compound eyes are present.