Siamcyclops Boonyanusith, Sanoamuang & Brancelj, 2018

Watiroyram, Santi & Koompoot, Kamonwan, 2024, Siamcyclops isanus sp. nov. (Copepoda, Cyclopoida, Cyclopidae), a new cave-dwelling species from northeastern Thailand, Subterranean Biology 49, pp. 185-200 : 185-200

Genus Siamcyclops Boonyanusith, Sanoamuang & Brancelj, 2018

Type species.

Siamcyclops cavernicolus Boonyanusith, Sanoamuang & Brancelj, 2018

Other species.

Siamcyclops isanus sp. nov.

Emended diagnosis of the genus.

Body cyclopiform, small size, with the greatest width at the cephalothorax. Pseudosegment present anterior to the genital double somite. Genital double-somite enlarged laterally, shorter than wide. Genital pore located near middle of somite length. Seminal receptacle small; anterior expansion longer and wider than posterior part. Anal operculum well developed or not, with a smooth or serrated distal margin. Antennule 11 - segmented in female, 15 - segmented in male. Antenna without Exp. Mandibular palp reduced, represented by three setae. P 1 – P 3 coxa with inner seta but absent on P 4. P 1 – P 4 intercoxal sclerite with round prominences. P 1 basis with inner seta. P 1 – P 4 with 2 - segmented Exp and Enp, subequal in size; setal and spines formula of Exp - 2 as 5.5.5.4 – 5 and 3.3.3.2, respectively. P 5 fused to pediger 5, with lateral seta and two ventral setae on small lobe. P 6 of female with slender seta and two spiniform setae, located dorso-laterally on the simple plate of the genital double-somite; three slender setae in male. P 3 Enp - 2 of male with a transformed apical spine and inner subterminal seta.