Scaptognathus ornatus Bartsch, 1984

Abé, Hiroshi, 2021, Taxonomic review of the subfamily Lohmannellinae (Acari: Trombidiformes Halacaridae) with morphological comparisons among genera, Zootaxa 4980 (2), pp. 201-255 : 233

Scaptognathus ornatus Bartsch, 1984

Diagnosis. Glp-1 same level as Ds-1. Ds-2 on membranous cuticle. PE without dorsal seta. GA bipartite in female. Female with 6 Pgs and 4 Sgs. Tr I–IV with 1-1-1-1 setae; Bf I–IV with 1-1-1-1 setae; Tf I–IV with 6-5-2-2 setae, 3-(1,2)-0-0 Bp setae; Gn I–IV with 5-4-3-3 setae, 2-1-0-0 Bp setae; Tb I–IV with 9-5-6-6 setae, 5-2-3-3 Bp setae; Ta I–IV with 3-3-3-3 dorsal setae, 1-1-0-0 Bp setae. Lc I with unidentate accessory process. Idiosoma length 248–343 in female. Idiosoma width 195 ( idiosoma length 255) in female. Gnathosoma length 214–229 in female. Gnathosoma width 117 ( gnathosoma length 214) in female. Ratio of gnathosoma to idiosoma 0.84 in female. Ratio of P-2 to P-1 2.73.

Remarks. This species closely resembles S. punctatus , however, differs from the latter by the presence of pitted areolae on almost all of the leg segments, instead of only on Tf in S. punctatus . Female is known.

Habitat. Littoral–Sublittoral zones: Coarse sands, rubbles, and stones at 0–15 m depth.

Distribution. North Atlantic Ocean: Isleta Iguana (Los Testigos) [ Venezuela]. Isla de Vieques [ Puerto Rico]. South Pacific Ocean: Herald Cays (Queensland Plateau), Carter Reef (Great Barrier Reef) [ Australia].

References. Abé (1990c), Abé & Green (1994), Bartsch (1984), Otto (2000b).

Depository. ZMA.