Lohmannella kervillei (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 : 215-216

Lohmannella kervillei (Trouessart, 1894)

Diagnosis. Two corneae present. Glp-1 posterior to Ds-1. Ds-2 on membranous cuticle. Ds-3 on membranous cuticle. One dorsal seta on PE. Female with 26–34 Pgs and 8 Sgs. Male with ca.66 Pgs and 8 Sgs. Tr I–IV with 1- 1-1-1 setae; Bf I–IV with 3-3-3-2 setae; Tf I–IV with 6-5-4-3 setae; Gn I–IV with 6-6-4-3 setae, 2-1-0-1 Bp setae; Tb I–IV with 11-10-6-6 setae, 6-5-3-3 Bp setae; Ta I–IV with (3,4)-(3,4)-4-3 dorsal setae, 1-1-3-1 Bp setae. Lc I with unidentate accessory process. Idiosoma length 353–447 in female, 340–353 in male, 303–328 in DN, 252–253 in PN, 187 in LV. Idiosoma width 291 ( idiosoma length 397) in female, 267 ( idiosoma length 340) in male. Gnathosoma length 179 ( idiosoma length 397) in female, 167 ( idiosoma length 340) in male. Gnathosoma width 102 ( idiosoma length 397) in female, 90 ( idiosoma length 340) in male. Ratio of gnathosoma to idiosoma 0.45–0.49. Ratio of P-2 to P-1 2.56.

Remarks. The species was originally described by Trouessart & Neuman (1894b) under the name of Leptognathus kervillei . Lohmann (1901) recorded this species in the genus Trouessartella . The species is very similar to L. norvegica . However, the palpi of L. norvegica are distinctly more slender than those in L. kervillei . The records under the name of L. norvegica from UK by Pugh & King (1985) are L. kervillei ( Somerfield 1991, Bartsch 2020). A record of this species from 318 m depth in Andre (1946) is in need of verification ( Bartsch 2020). Female, male, DN, and LV are known.

Habitat. Littoral–Sublittoral zones: Algae ( Laminaria digitata , Laminaria ochroleuca , (Phaeophyta), Corallina spp. , Lometaria spp. (Rhodophyta)). Lichina pigmaea (Lichinales) . Laminaria holdfasts, crevices in Lithothamnion and Lithophyllum (Rhodophyta), barnacles, mussels, hydroids, bryozoans, sands and gravels among rocks, sediment at 9–318 m depth.

Distribution. North Atlantic Ocean: Ijmuiden [ Netherlands]. Grandcamp-les-Bains, Îles St. Marcouf, Cap de la Hague, Pointe du Roc, Granville, Îles Chausey, Roscoff, St. Guénolé (Penmarch), Croisic, Saint-Martin-de-Ré, Vaux-sur-Mer [ France]. Mouro Is. (43°28’24’’N, 3°45’22’’W) [ Spain]. Scotman’s Bay, Dalkey Is. (Dublin), Ring Head, Carrigathorna (West Cork) [ Ireland]. Harwich, Brighton, Weymouth, Downderry (Cornwall), Bracelet Bay (Gower Peninsula), Dale (Pembrokeshire) [ UK]. Azores [ Portugal].

References. André (1946), Bartsch (1975, 1977b, 1979a, e, 1989b, 2020), Bartsch & Smit (2006), Gadeau de Kerville (1894, 1898, 1901), Green & Macquitty (1987), Lohmann (1901, 1907b), Riesgo et al. (2010), Somerfield (1988, 1991), Somerfield & Jeal (1995), Trouessart (1899, 1900), Trouessart & Neumann (1894b, 1898, 1901), Viets (1927a, 1940, 1950a).

Depository. MNHNP.