Warregoensis, King & Stringer & Leijs, 2023

King, Rachael A., Stringer, Danielle N. & Leijs, Remko, 2023, Carnarvonis gen. nov. and Warregoensis gen. nov.: Two New Genera and Species of Subterranean Amphipods (Crangonyctoidea: Chillagoeidae) Described from North-eastern Australia, Records of the Australian Museum (Rec. Aust. Mus.) 75 (4), pp. 447-457 : 452

Warregoensis gen. nov.

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Type species. Warregoensis lowryi sp. nov.

Diagnosis. Body laterally compressed, not vermiform. Eyes absent. Antenna 1 longer than antenna 2, accessory flagellum of two articles. Antenna 2 flagellum shorter than peduncle, calceoli absent. Mandibular palp of 3 articles. Labium (lower lip) lacking inner lobes. Coxae 1–4 distinctly longer than coxae 5–7; coxa 1 distinctly shorter than coxae 2–3; coxa 4 with small but distinct excavated corner on the posterior margin. Gnathopods 1–2 large (propodus as large or larger than head length), not sexually dimorphic; gnathopod 2 propodus slightly longer than in gnathopod 1; gnathopods 1–2 propodus lateral face with distinct excavation above and parallel to palm margin, palm margins crenulate and with 2 excavations, without robust setae along palm margin, with rows of 3 mesial (inner) and 2–3 lateral (outer) robust setae either side of palm corner (where dactyl fits to the propodus). Pereopod 6 and 7 similar lengths, bases narrow (close to 2 times as long as wide). Coxal gills on pereopods 2–7, sternal gills on thoracic segments 2–6, slender, around ½ length of coxal gills. Uropod 3 outer ramus of 1 article, inner ramus absent. Telson cleft to ⅓ depth, with apical setae.

Etymology. Named for the Warrego River Basin where the type specimens of Warregoensis lowryi sp. nov. were collected. Gender: masculine.

Remarks. Warregoensis gen. nov. can be clearly identified from the large overall size of the adult animals ( 6.2 mm vs 4.5 mm for Carnarvonis katjae sp. nov.), the large gnathopods 1–2, and crenulations of the palm margin in gnathopods 1–2, telson cleft to ⅓ depth, and pereopod 5–7 bases narrow (close to 2 times as long as wide).