Scaptognathides bicornis Bartsch 1977

Abé, Hiroshi, 2021, Taxonomic review of the subfamily Lohmannellinae (Acari: Trombidiformes Halacaridae) with morphological comparisons among genera, Zootaxa 4980 (2), pp. 201-255 : 224

Scaptognathides bicornis Bartsch 1977

Diagnosis. Ds-2 and Ds-3 on membranous cuticle. OC with 2 Glps. Female with 4 Pgs without Sgs. Male with 14–18 Pgs and 6 Sgs. Tr I–IV with 0-0-1-1 setae; Bf I–IV with 2-2-2-2 setae; Tf I–IV with 5-4-2-2 setae; Gn I–IV with 5-4-3-3 setae; Tb I–IV with 5-5-5-5 setae; Ta I–IV with 3-3-4-3 dorsal setae. Lc II–IV with comb. Idiosoma length 127–147 in female, 125–137 in male, 106–125 in DN, 98–117 in PN, 77–92 in LV. Idiosoma width 77 in female ( idiosoma length 127), 75 in male ( idiosoma length 125). Gnathosoma length 75 in female ( idiosoma length 127), 72 in male ( idiosoma length 125). Gnathosoma width 40 in male ( idiosoma length 125). Ratio of gnathosoma to idiosoma 0.55–0.60.

Remarks. The species differs from congeners by foveate dorsal plates, Ds-2–Ds-4 on membranous area, female without Sgs, and Ta III with 4 dorsal setae. Female, male, DN, PN, and LV are known.

Habitat. Littoral zone: Sandy sediment on upper slope at 10–100 cm sediment depth.

Distribution. South Pacific Ocean: Marchena, James, Bartholomé, Santa Cruz, Barrington, Floreana, San Cristóbal (Galapagos Is.) [ Equador].

References. Bartsch (1977a, 1986a, 1996b), Bartsch & Schmidt (1978).

Depository. ZIZMH.