Pseudohesperocyclops, Brancelj & Boonyanusith & Sanoamuang, 2024

Brancelj, Anton, Boonyanusith, Chaichat & Sanoamuang, Laorsri, 2024, A new cyclopoid genus (Copepoda, Crustacea) from a deep aquifer in northeastern Thailand with comments on peculiar sampling sites and local fauna, Raffles Bulletin of Zoology 72, pp. 71-83 : 74

Pseudohesperocyclops , new genus

Diagnosis (for females only). Small Cyclopinae with slightly elongated habitus and greatest width at posterior margin of cephalosome. Antennule 11-segmented, short, not reaching posterior margin of cephalosome. Genital double somite as long as wide or slightly shorter; incision between anterior and posterior half of segment not well developed. Seminal receptacle well developed; anterior part semicircular; posterior part slightly larger, also semicircular, with well-developed lateral expansions. P5 with protopodal segment incorporated into Pd5, with well-developed outer basal seta; exopodal segment separated from Pd5, shorter than wide, with one spine and one long seta apically; insertion of spine and seta close to each other. P6 as small semicircular plate located dorsolaterally, armed with two short spines and longer seta. Anal operculum well developed, broadly rounded or rectangular, free margin smooth. Basis of antenna with one seta representing Exp. Mandibular palp with two very long plumose setae and short one, bare. Coxae of P1–P4 with plumose seta on inner corner. P1–P4 with 2-segmented Exp and Enp, similar in length. Spine and setae formula on terminal segments of Exp P1–P4 3.4.3.3 and 5.5.5.5, respectively. P4 Enp-2 with one spine.

Etymology. The genus name is composed of the Latin preposition “pseudo” (meaning “false”) and the existing generic name Hesperocyclops ( Herbst, 1984) . The gender is masculine.

Type species. Pseudohesperocyclops loeiensis , new species.

Additional attributed species. Pseudohesperocyclops cushae ( Reid, 1991) , new status; Pseudohesperocyclops thailandicus ( Boonyanusith, Sanoamuang & Brancelj, 2018) , new status.