The Onchidiidæ are described as agnathous, but I am confident of having observed the jaw figured.
Source: wiktionary
Agnathous
/ˈæɡ.nə.θəs/
Synonyms for "agnathous" (2 found)
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Sample sentences
7 total sentences available.
The mouth is a transverse slit, which shows no teeth, nor any jaws properly so called, and therefore affords an apparent support to the agnathous theory of the Ostracodermi.
Source: wiktionary
This and related agnathous (jawless), finless forms inhabited shallow seas or estuarine habitats[…].
Source: wiktionary
Parenthetically, this line treatment suggests an attempt to mimic the agnathous (jawless) head, if we suppose that the jaw area was colored suitably dark in contrast to the face proper.
Source: wiktionary
Showing 4 of 7 available sentences.