Scaptognathus trouessarti Halbert, 1915

Abé, Hiroshi, 2021, Taxonomic review of the subfamily Lohmannellinae (Acari: Trombidiformes Halacaridae) with morphological comparisons among genera, Zootaxa 4980 (2), pp. 201-255 : 236-237

Scaptognathus trouessarti Halbert, 1915

Diagnosis. Glp-1 not distinct. Ds-2 on membranous cuticle. PE with 1 dorsal seta. GA bipartite in male. Male with 32 Pgs. Tr I–IV with 1-1-1-1 setae; Bf I–IV with 2-2-1-1 setae; Tf I–IV with 4-4-3-2 setae, 2-1-0-0 Bp setae; Gn I–IV with 4-3-2 (3?)-3 setae, 2-1-0-0 Bp setae; Tb I–IV with 8-6-7-7(8?) setae, 5-3-4-4 Bp setae; Ta I–IV with 3-3-3-3 dorsal setae, without Bp setae. Lc I with unidentate accessory process. Idiosoma length 436 in male ( holotype). Idiosoma width 284 in male ( holotype). Gnathosoma length 284 in male ( holotype). Gnathosoma width 132 in male ( holotype). Ratio of gnathosoma to idiosoma 0.65 in male ( holotype). Ratio of P-2 to P-1 4.10 in male ( holotype).

Remarks. This species resembles S. triden s and S. hallezi , however, differs from these two species by the round posterior margin of AD, Ds-2 on membranous cuticle, convex anterior margin of pars sclerosum in male, 32 Pgs in male, and leg chaetotaxy. Single male is known.

Habitat. Sublittoral zone: Fine gravels at a depth of 35–39 m. Fronds and holdfasts of Laminaria ochroleuca (Phaeophyta).

Distribution. North Atlantic Ocean: Dingle Bay [ Ireland]. Mouro Is. ( 43°28’24’’N, 3°45’22’’W) [ Spain].

References. Abé (1990c), Abé & Green (1994), Abé & O’Connor (1991), Bamber (1982), Bartsch (1994b), Bartsch & Schmidt (1978), Green & Macquitty (1987), Halbert (1915), Riesgo et al. (2010).

Depository. NMID.