Family Microprotopidae Myers & Lowry, 2003

Diagnosis. Mandible palp article 3 nearly parallel-sided, posterior margin without, or with very few, setae. Male gnathopod 2 coxa only a little larger than coxa 1 and 3. Uropods 1–2 peduncle without inter-ramal spine. Uropod 3 uniramous.

Type genus. Microprotopus Norman, 1867 .

Included genus. Microprotopus Norman, 1867, by monotypy.

Remarks. The only discrete differences between Microprotopidae and Photidae are antenna 1 article 1 length compared with article 2 (subequal in Microprotopidae, shorter in Photidae); pereopods 5–6 merus setation (posterior margin weakly setose in Microprotopidae, without setae in Photidae) and pereopod 5 carpus shape (slightly expanded in Microprotopidae, linear in Photidae). Photidae also have rounded eye lobes that are often strongly extended whereas Microprotopidae have sub-triangular eye lobes.