Holoparasitus lawrencei Hyatt, 1987

Ilinca Juvara-Bals, 2017, New and rare species of Holoparasitus Oudemans, 1936 (Acari, Gamasida, Parasitidae) from the Athias-Henriot Collection, Revue suisse de Zoologie 124 (2), pp. 225-239 : 232-234

Holoparasitus lawrencei Hyatt, 1987 Figs 4 , 6E

Material examined: NHML 1984.12.4.-1; holotype; female; England, Cornwall-Hayle, from dry, light, leaf-litter; 24.5.1975; leg P. N. Lawrence. – NHML 1925.6.24.584; paratype; female; England, Lincolnshire, no locality, no habitat data, 1900, leg. C. F. George. ‒ NHML 1984.12.4.-3; paratype; male; United Kingdom, Isle of Wight, no habitat data; April 1948; leg T. A. Lloyd. – NHML 1984.12.4-2; paratype; male; Norfolk- Blackborough, with no habitat data; 25.2.1969; leg. A. Reeve.

Redescription of male: Length of idiosoma 780-840, width 550-610 ( Hyatt, 1987). Genital lamina with a triangular apex instead of a bifid one ( Fig. 4D ). Length of simple hypognathal setae: hyp.1, hyp.2 = 54-61, hyp.3 = 38; pc. pilose = 66. Trochanter of pedipalp with a small protuberance between v1 and v2 ( Fig. 4C ).

Armature of leg II shown in Fig. 4 A-B. Gland pore gv2 double, situated behind coxa IV. Measurements (of 2 specimens): tarsus I = 192-206; tarsus IV = 240-250.

Redescription of female: Endogynium formed by a very big, oval and denticulate sack. Ventrally a central protrusion flanked by two rounded sacks and covered by a wrinkled membrane on posterior margin. Dorsally two very big structures filled with prominent denticles ( Fig. 6E ). Measurements: epigynium: height = 184-192, basal width = 228; h/b = 0.82-0.84. Sternal shield: st1-st1’ = 62, st2-st2’ = 108, st3-st3’ = 139; st1 = 54, st2 = 60, st3 = 66. Tarsus I = 187-192; tarsus IV = 240.

Remarks: The holotype and the paratypes examined correspond well with the original description of Hyatt. I here illustrate the endogynium, the armature of leg II and add some measurements. In the original description ( Hyatt, 1987: fig. 11E) the movable digit of the female chelicera was drawn with 4-5 denticles, but in the holo- and paratypes studied I observed only 3 denticles. The other paratypes were not available in the NHML collection. Holoparasitus lawrencei was described by Hyatt (1987) from Great Britain; the type locality is Hayle in Cornwall. He identified specimens of this species from England (10 places), Scotland (2 localities), Wales and Ireland. All the specimens, except the holotype, were considered as paratypes (20 males, 15 females). Unfortunately not all of the paratypes are deposited in the collection of the NHML so that the variability of the morphological characters of this species cannot be evaluated.

Figures

Fig 4. Holoparasitus lawrencei Hyatt, 1987, male. (A-B) Genual and tibial apophysis of leg II, ventral and lateral view. (C) Palptrochanter. (D) Genital lamina. (E) Chelicera, paraxial view.

Fig 6. Holoparasitus paralawrencei sp. nov., female (A-D), male (F) and Holoparasitus lawrencei Hyatt, 1987, female (E). (A) Presternal plate and sternal shield. (B) Apex of epigynium and endogynium, ventral view. (B’) Apex of epigynium, dorsal view. (C-D) Endogynium, ventral and (E) dorsal view. (F) Sternal shield and genital lamina.