Ameiridae Boeck, 1865

Yildiz, Nuran Oezlem & Karaytug, Suephan, 2024, Taxonomic revision of the Nitocra affinis Gurney, 1927 species complex (Harpacticoida, Ameiridae) with descriptions of four new species and re-evaluation of its subspecies, ZooKeys 1191, pp. 35-74 : 35

Family Ameiridae Boeck, 1865

Updated diagnosis.

Body semi-cylindrical or cylindrical with prosome composed of cephalothorax with completely fused first pedigerous somite, and three free pedigerous somites with smooth hyaline frills. Urosome five-segmented, comprising the fifth pedigerous somite, genital double-somite and three free abdominal somites. Rostrum small, triangular and defined at base or not. Anal operculum apically with row of robust spinules or smooth. Caudal ramus with seven setae. Antennule five to eight-segmented in female, nine or ten-segmented and geniculate in male, first segment not unusually elongate. Antenna with coxa, allobasis or basis, one-segmented endopod, and one or two-segmented exopod. P1-P4 with one to three-segmented exopod and endopod. The inner spine of basis of P1 hook-like in male. P5 with baseoendopod and separate exopod.