Scaptognathides ornatus Bartsch 1988

Abé, Hiroshi, 2021, Taxonomic review of the subfamily Lohmannellinae (Acari: Trombidiformes Halacaridae) with morphological comparisons among genera, Zootaxa 4980 (2), pp. 201-255 : 225-226

Scaptognathides ornatus Bartsch 1988

Diagnosis. Ds-2 and Ds-3 on AD. OC with 2 Glps. Female with 4 Pgs and 2 Sgs. Tr I–IV with 1-1-1-1 setae; Bf I–IV with 2-2-2-2 setae; Tf I–IV with 5-5-2-2 setae; Gn I–IV with 4-4-3-3 setae; Tb I–IV with 5-5-5-5 setae; Ta I–IV with 3-3-3-3 dorsal setae. Lc II–IV with minute accessory process and comb. Idiosoma length 207–268 in female (holotype 207), 241 in DN. Idiosoma width 120–169 in female, 137 in DN (holotype 120). Gnathosoma length 102–114 in female (holotype 102), 96 in DN. Gnathosoma width 57–71 in female (holotype 57), 61 in DN. Ratio of gnathosoma to idiosoma 0.43–0.49 in female, 0.40 in DN.

Remarks. The characteristics of this species are: reticulate dorsal plates, presence of Sgs in female, and Ta III with 3 dorsal setae. This species is similar to S. planus in body size and ornamentation of the dorsal plates, however, distinguished from the latter by the ratio of gnathosoma to idiosoma and leg chaetotaxy. Female and DN are known.

Habitat. Littoral zone: Coarse unsorted sandy sediment at intertidal zone.

Distribution. North Pacific Ocean: Kawaihae Bay (Hawaiian Is.) [ USA]. Okinawa [ Japan]. Indian Ocean: Dampier [ Australia].

References. Abé (2011), Bartsch (1988a, 1996b, 2003a).

Depository. BMHH.