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Classification
Ambasia atlantica (Milne-Edwards, 1830)
Nomenclature
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Family: LysianassidaeGenus: Ambasia
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Synonyms: 3
SUMMARY
Based on mature female, male unknown: Antenna 1 shorter than antenna 2; flagellum article 1 as long as remaining articles combined. Antenna 2 less than 40% of body length. Eyes large, reniform. Lateral cephalic lobes subacute. Maxilliped palp article 4 rudimentary; inner plate poorly developed, not reaching half length of outer plate.
Gnathopod 1 simple; coxa reduced, significantly shorter than coxa 2, tapering distally; ischium short; carpus long, of subequal length to propodus; propodus margins tapering. Gnathopod 2 subchelate; carpus at least twice as long as propodus; dactylus minute. Pereopod 5 coxa equilobate; basis distinctly longer than broad. Coxa 6 produced into a posterior lobe.
Epimeron 3 posterodistal corner produced, forming a small spine. Urosomite 1 with dorsal depression, carinate dorsally. Uropods 1 and 2 rami subequal, uropod 2 inner ramus without marginal constriction(s); uropod 3 outer ramus 2-articulate, article 2 short, rami distinctly unequal. Telson distinctly longer than broad, deeply cleft.