Chalarosthrix, Gómez & Nazari, 2022

Gómez, Samuel & Nazari, Fatemeh, 2022, Chalarosthrix gen. nov., a new taxon of the Sphingothrix-Triathrix clade (Harpacticoida: Cletodidae) from the Province of Cortez, Eastern Mexican Pacific, Zootaxa 5116 (3), pp. 410-428 : 414

Genus Chalarosthrix gen. nov.

urn:lsid:zoobank.org:act:9142FF1A-0C5B-4828-86F5-52D3D0F7DA45

Type species. Chalarosthrix bisetosa sp. nov., by original designation.

Other species. Enhydrosoma nicobarica Sewell 1940 (= Triathrix nicobarica ( Sewell 1940) , Chalarosthrix nicobarica ( Sewell 1940) comb. nov.), Triathrix mayae Fiers 1997 (= Chalarosthrix mayae ( Fiers 1997) comb. nov.).

Diagnosis (based on female). Cletodidae . Cephalothorax with four sensillum-bearing socles along a small but distinct chitinous extension. Antennule five-segmented. Antennary allobasis with two abexopodal setae; exopod one-segmented, with three setae (one lateral and two distal). Mandibular palp with five setae. Maxillulary basis with two endites, distal endite with three, proximal endite with two setae; exopod and endopod fused to basis, the former represented by two, the latter by one seta; coxal endite with one seta. Maxillary syncoxa with two endites; allobasis with claw and two accompanying setae; endopod represented by two setae. Maxilliped subchelate; syncoxa and basis unarmed; endopodal claw slender, accompanied by long accessory seta. P1–P4 exopods three-segmented, endopods two-segmented. P1 EXP3 with four elements; distal outer seta whip-like, longer than subdistal outer spine; distal setae without setulose distal tuft, and distal inner seta not inclined outwardly and not intersecting base of distal outer seta; P1 ENP2 with two setae. Armature formula of P1–P4 EXP/ENP: (P1) 0,0,022/0,011; (P2) 0,0,022/0,020; (P3) 0,0,122/0,021; (P4) 0,0,122/0,021. P5 EXP and ENP elongate, with three setae each. Caudal rami elongate, with seven elements.

Etymology. The generic epithet comes from the Greek adjective χαλαρός, chalarós, loose, and from the Ancient Greek noun θρίξ, thrix, hair, and refers to the loose position of the apical elements on the P1 EXP3. Gender feminine.