Scaptognathides hawaiiensis 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

Scaptognathides hawaiiensis Bartsch 1988

Diagnosis. Ds-2 and Ds-3 on AD. OC with 1 Glp. 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 4-4-2-2 setae; Gn I–IV with 4-4-3-3 setae; Tb I–IV with 5-5-5-(5,6) setae; Ta I–IV with 3-3-3-3 dorsal setae. Lc II–IV with quite minute comb. Idiosoma length 153–181 in female, 142–160 in PN. Idiosoma width 103 in female ( idiosoma length 154). Gnathosoma length 72 in female, 60–66 in PN. Gnathosoma width 40 in female ( idiosoma length 154). Ratio of gnathosoma to idiosoma 0.44–0.47.

Remarks. The species is characterized by foveate dorsal plates, a single Glp on OC, no Glps on anterior part of PD, Sgs present in female, and Ta III with 3 dorsal setae. This species is distinguished from congeners by the lack of Glps on the anterior part of PD. A species recorded by Bartsch (1979c) as “ Scaptognathides sp. A ” with idiosoma length 127, width 72, and gnathosoma length 64 is regarded as this species ( Bartsch 1988a). Female and PN are known.

Habitat. Littoral zone: Coral sands at 20 cm sediment depth on coastal slope and medium-grained sandy sediment at middle and upper shore.

Distribution. North Pacific Ocean: Kaneohe Bay (Hawaiian Is.) [ USA]. Hong Kong [ China]. Lazarus Is., St. John’s Is. [ Singapore]. Indian Ocean: Dampier [ Australia].

References. Bartsch (1979c, 1988a, 1991a, 1996b, 2003a, 2009b).

Depository. BMHH, ZIZMH.