Holoparasitus floriformis, Ilinca Juvara-Bals, 2017

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 : 235-239

Holoparasitus floriformis sp. nov.

Figs 7- 8

Holotype: slide D768 in MHNG arthropoda collection; male; Spain, Roncesvalles, Prov. Navarra, road towards Burguete (the Pyrenees), litter of beech forest, alt. 949 m; 5.08.1955 (Sp. 429).

Paratypes: 4 females; same data as for holotype.

Diagnosis: Long corniculi of male reaching level of seta v2, movable digit of the chelicera stout and with an axe-shaped apex; femur of leg II with a long, curved femoral apophysis and with a big, oval axillary process. Presternal plate of female without denticles; epigynium very long h/b = 1; endogynium a sack with its opening surrounded with petal-like structures.

Etymology: The species names refers to the unique flower-shape (Latin: flos = flower) of the endogynium.

Description of male: Sclerocuticle of dorsal idiosoma with a simple reticulation, colour yellowish brown. Setae simple, their length on opisthonotum 12-15. Length of peritrematal shield 220.

Ventral idiosoma: Genital lamina with rounded angles; central prong absent ( Fig. 7D ). Sclerocuticle reticulated, without strongly procurved line or excipulum. All setae simple. Gland pore gv1 and gv2 simple. Eight pairs of setae on opisthogaster, their length about 24.

Gnathosoma: Gnathotectum trispinate ( Fig. 8H ). Corniculi straight and long (48 long), reaching setae v2, with a small protuberance at their base ( Fig. 7C ). Length of simple hypognathal setae: hyp.1 = 36, hyp.2 = 30, hyp.3 = 24, pc. = 42. Palptrochanter with pilose v2 and simple v1. Chelicera ( Fig. 7 A-B): movable digit large (84 long), its apex like a sharp axe and its inner margin denticulate; fixed digit with slightly curved apex and its inner margin with 1 denticle above pilus dentilis and 3 below it.

Legs: Armature of leg II as shown in Fig. 7 E-F: long, curved femoral apophysis and large, oval axillary process; rounded apophysis situated on distal margin of genual segment; tibia with two apophyses, one triangular the other elliptical, both situated medially. Measurements: tarsus I = 163; tarsus IV = 156.

Description of female: Idiosoma well sclerotized, colour yellowish brown. All setae simple, length of podonotal setae: j1 = 36, s1 = 18, others 24; length of

opisthonotal setae 12-18. Length of peritrematal shield about 230.

Ventral idiosoma: ( Fig. 8 A-B). Presternal plate ribbonlike, without denticles. Sternal shield reticulated; length of sternal setae: st1 = 48, st2 = 42, st3 = 54. Gland pore gv1 situated medially on posterior margin ( Fig. 8A ). Paragynial shield reticulated, stretched out around lateral margin of epigynium; posterior paragynial protrusion small and rounded; metagynial sclerite elliptical ( Fig. 8B ). Epigynium as long as its width at base. Apex elongated, anteriorly with a triangular apex and a slightly sclerotized subapical structure ( Fig. 8C ). Setae st5 short (20-24). Endogynium a big sack with its opening surrounded by structures shaped like petals, all covered by a thin membrane with a denticulate anterior margin ( Fig. 8 D- E). Gland pore gv2 simple. Opisthogaster with 8-9 pairs of setae, their length: ZV4 = 30, JV5 = 18, others 24-30. Measurements: distance between sternal setae: st1-st1’ = 72, st2-st2’ = 96, st3-st3’ = 110-132; height of sternal shield = 36; epigynium: height = 187- 192, basal width = 180-192, h/b = 1-1.10;

Gnathosoma: Gnathotectum trispinate ( Fig. 8G ). Corniculi conical. Hypognathal groove with 9-10 rows, most of them oligodent; hypostomatic setae simple, their length hyp.1, hyp.2 = 30; hyp.3 = 24; pc. = 42 ( Fig. 8F ). Movable and fixed digit of chelicera 84 long.

Legs: Coxa II with a ridge of 8 denticles ( Fig. 7G ). Length of tarsus I = 150-156 and tarsus IV = 156-161.

Remarks: The new species can be easily distinguished from all the known species of Holoparasitus by the particular characteristics of the endo- and epigynium of the female and by those of the chelicera of the male.

Figures

Fig 7. Holoparasitus floriformis sp. nov., male (A-F), female (G). (A-B) Chelicera. (C) Palptrochanter and corniculus. (D) Genital lamina. (E) Genual and tibial apophysis of leg II, anterolateral view. (F) Femur, genu, tibia, posterolateral view. (G) Denticulate ridge on coxa II.

Fig 8. Holoparasitus floriformis sp. nov., female (A-G), male (H). (A) Presternal plate and sternal shield. (B) Paragynia and epigynium. (C) Apex of epigynium. (D-E) Endogynium. (F) Gnathosoma and palptrochanter, ventral view. (G-H) Gnathotectum.