Xenohalacarus longirostris Otto 2000

Abé, Hiroshi, 2021, Taxonomic review of the subfamily Lohmannellinae (Acari: Trombidiformes Halacaridae) with morphological comparisons among genera, Zootaxa 4980 (2), pp. 201-255 : 237-238

Xenohalacarus longirostris Otto 2000

Diagnosis. Cornea absent. Glp-1 not found. Palp 4 segmented. P-2 with 2 setae. Ds-2 on OC. Ds-3 on membranous cuticle. One dorsal seta on PE. Female with 8 or 10 Pgs without Sgs. Male with 56 Pgs and 10 Sgs. Tr I–IV with 1-1-1-1 setae; Bf I–IV with 2-2-2-1 setae; Tf I–IV with 4-4-3-3 setae, without Bp setae; Gn I–IV with 6-6-4-4 setae, 0-0-1-0 heavy thickened (not Bp) setae; Tb I–IV with 8-8-6-6 setae, 2-2-1-0 heavy thickened (not Bp) setae; Ta I–IV with 3-3-4-3 dorsal setae, without Bp setae. Lc I with elaborate teeth. Lc II–IV with unidentate accessory process and fine comb. Idiosoma length 362 in holotype female, 335 in male, 325–330 in DN. Gnathosoma length ca. 170 in holotype female. Gnathosoma width ca. 49 in holotype female. Ratio of gnathosoma to idiosoma 0.47. Ratio of P-2 to P-1 12.00.

Remarks. Characteristics are: the long heavy teeth on Lc I, elongate rostrum, long palpi with 5 apical setae, OC with 2 Glps, Ta IV without parambulacral setae, and presence of ventral setae on membranous cuticle of idiosoma . Female, male, and DN are known.

Habitat. Subtidal zone: Coarse sands at 10–15 m depth.

Distribution. South Pacific Ocean: Chilcott Islet (16°56.51’S, 150°0.4’E) (Queensland Plateau) [ Australia].

Reference. Otto (2000a).

Depository. QMS.