Karstodiaptomus Shu, Brancelj, Chen, Yang & Chen, 2017, n. gen.

Genus: Karstodiaptomus n. gen.

Diagnosis of the genus. Body transparent in live specimens and white when preserved in alcohol; body length about 1 mm; body shape typical for Diaptomidae; eye not discernible. Antennule with 25 discernible segments in female, 23 in right prehensile antennule in male. Segments 13–16 in male right antennule only slightly widened; segments 7, 9, 10, 12, 13, 15, 17, 18 with 1 spine each, segment 19 with 2 spines. No spine or hyaline membrane on antepenultimate segment. Rostrum well developed in both sexes, with 2 finger-like projections. Pd4–Pd5 incompletely fused in female and in Pd2–Pd4 of male. Lateral wings of Pd 5 in both sexes moderately developed, with 1 sensillum on left side in female; 2 sensilla on left and 1 on right side in male. Urosome in female asymmetrical, with 3 discernible somites; 5-segmented in male. P1–P3 with 2-segmented Exp and Enp, P4 with 3- segmented Exp and 2-segmented Enp. Number of setae on P1–P4 Exp-2 as: 5, 6, 6, 5. P5 Exp- 2 in female modified into beak-like extension, smooth; Exp-3 reduced, represented by 1 spine and 1 seta; Enp 1-segmented, long. Endclaw of P5 Exp-2 on right leg in male long, slender; Enp on right leg 1-segmented, long; Exp-2 on left leg short, with short process apically.