Scaptognathus hallezi Trouessart, 1894

Abé, Hiroshi, 2021, Taxonomic review of the subfamily Lohmannellinae (Acari: Trombidiformes Halacaridae) with morphological comparisons among genera, Zootaxa 4980 (2), pp. 201-255 : 229-230

Scaptognathus hallezi Trouessart, 1894

Diagnosis. Glp-1 same level as Ds-1. Ds-2 on AD. PE with 1 dorsal seta. GA bipartite in female and male. Female with 3 or 4 Pgs and 4 Sgs. Male with 30–40 Pgs and 6 Sgs. Tr I–IV with 1-1-1-1 setae; Bf I–IV with 2-(1,2)- (1,2)-(1,2) setae; Tf I–IV with (4,5)-4-2-2 setae, 2-0-0-0 Bp setae; Gn I–IV with (2,4)-(3,5)-3-3 setae, 2-1-0-0 Bp setae; Tb I–IV with (7,9)-6-(6,7)-(5,7) setae, 6-3-4-4 Bp setae; Ta I–IV with 3-3-3-3 dorsal setae, 1-1-0-0 Bp setae. Lc I with accessory process. Idiosoma length 223–260 in female, 223–241 in male. Idiosoma width 126 ( idiosoma length 231) in female, 145–148 ( idiosoma length 237–240) in male. Gnathosoma length 148–167 ( idiosoma length 223–260) in female, 148–155 ( idiosoma length 223–241) in male. Ratio of gnathosoma to idiosoma 0.66–0.71 in female, 0.62–0.69 in male. Ratio of P-2 to P-1 3.17.

Remarks. This species is similar to S. sabularius and S. tereninus in having Ds-2 on AD. However, S. hallezi differs from the latter two species in the shape of GA in female. Bartsch (1986) suggested that S. neretinus Morselli & Mari, 1981 would be synonymous with S. hallezi . Female and male are known.

Habitat. Littoral–Sublittoral zones: Medium to coarse sandy sediment, algae, and bryozoans at intertidal zone to 58 m depth.

Distribution. North Atlantic Ocean: Roscoff, Granville [ France]. Mediterranean: Île If, Île Ratonneau, Île Riou, Île Jarre, Plateau des Chevres, Envau, Port-Pin [ France]. Lido Frascone (Puglia), Lido dell’Ancora [ Italy]. Kaþ, Hamitbey Plajý (Antalya) [ Turkey]. Indian Ocean: Waltair [ India].

References. Abé (1990c), Abé & Green (1994), André (1946), Bartsch (1986b, 1988c, 1994b), Durucan (2018), Halbert (1915), Lohmann (1901), Monniot (1964), Morselli & Mari (1984), Rao & Ganapati (1968), Trouessart & Neumann (1894a, 1894b).

Depository. MNHNP.