Holoparasitus madridensis, 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 : 226-228

Holoparasitus madridensis sp. nov.

Fig. 1

Holotype: Male; Spain, El Prado, surroundings of Madrid, sifting leaf litter under Quercus ilex L.; 5.02.1951 (Sp. 13).

Paratypes: 2 males and 5 females; with the same data as for the holotype.

Other material examined: 4 males, 4 females, 1DN; Spain, El Prado, surrounding of Madrid, sifting leaf litter under bushes of Quercus ilex L.; 0 5.02.1951 (Sp. 8). – 1 male, 14 females; Spain, El Prado, surrounding of Madrid, swampy soil near a spring, sifting litter of Scirpus sp.; 0 5.02. 1951 (Sp. 11). ‒ 3 males, 3 females; Spain, surrounding of Torrelodones, north of Madrid, forest soil under Quercus ilex L.; 0 6.07.1952 (Sp. 93).

Diagnosis: Male palptrochanter with sharp protuberance situated between slightly pilose seta v1 and thicker pilose seta v2; this character associated with elongated corniculi carrying a small protuberance in their distal part. Female endogynium cup-shaped, with two short protrusions on posterior margin; epigynium with ovoidal, subapical structure and with sharp triangular apex.

Etymology: The species name, a Latinized adjective, refers to the city of Madrid in the surroundings of which the species was sampled.

Description of male: Idiosoma well sclerotized, yellow-brown-colored; its length 648-672, width 388- 456. Dimensions of setae: on podonotum j1 = 36, r5 = 48, others about 24; opisthonotal setae short 12-18. Length of peritrematal shield 197-205.

Ventral idiosoma: Genital lamina in a shallow concavity; anterior margin of genital lamina with truncated central prong and two lateral triangular extensions, microsclerite trapezoidal ( Fig. 1B ). Sternogenital shield reticulated, gland pore gv1 present, length of sternal setae 42 to 48; gland pore gv2 simple; 8-9 pairs of opisthogastric setae, their length 36 to 42.

Gnathosoma: Gnathotectum trispinate, with large median prong and tiny lateral ones ( Fig. 1E ). Corniculi elongated, with small protuberance in their distal third ( Fig. 1D ). Hypognathal groove with 8-10 slightly denticulate rows; length of simple setae: hyp.1 = 36, hyp.2 = 43, hyp.3 = 24, pc. = 42-48. Palptrochanter with setae v1 slightly pilose, v2 barbed and with a small, sharp protuberance located between these setae ( Fig. 1C ). Chelicera ( Fig. 1F ): fixed digit straight, with 2-3 small denticles above and under pilus dentilis; movable digit 78 long, with 4-5 denticles on inner margin; spermatodactyl slightly arched; arthrodial brush small.

Legs: Coxa II with a group of six denticles and an isolated basal one ( Fig. 1L ). Spurs of legs II illustrated in Fig. 1A : short rounded apophysis and axillary process, ellipsoidal apophysis located on anterior margin of genual segment, tibial apophysis rectangular, its anterior margin indented. Measurements: tarsus I = 156-168; tarsus IV = 170-180.

Description of female: Idiosoma well sclerotized, yellow-brown-colored; its length 648-672 and its width 432-456. Dimensions of some podonotal setae: j1 = 38, r5 = 54; opisthonotal setae 12. Length of peritrematal shield 206-209.

Ventral idiosoma: Presternal plate ribbon-like, serrated, with median constriction; sternal shield reticulated, gv1 situated near setae st3, sternal setae simple, their length ranging from 42 to 48. ( Fig. 1G ). Paragynial shield with rounded posterolateral protrusions, metagynial shield ellipsoidal ( Fig. 1I ). Epigynium with sharp triangular apex, its length 48-54; subapical structure discoidal ( Fig. 1H ).

Endogynium cup-like, with two conical protrusions on its posterior margin; their height 24-30 and their basal distance 4-5 ( Fig. 1 J-K). Gland pore gv2 simple. Eight pairs of simple opisthogastric setae, their length 24 to 30. Adanal and postanal setae simple and short (12 long). Measurements: Sternal shield: st1-st1’ = 50-60, st2-st2’ = 80-96, st3-st3’ = 108-117. Epigynium: height = 144- 156, basal width = 168-180, h/b = 0.85-0.86.

Gnathosoma: Gnathotectum trispinate, its central prong sharply pointed ( Fig. 1N ). Corniculi conical, hypognathal groove with 8 rows of denticles, last 3 oligodenticulated. Hypostomatic setae simple, palpcoxal setae pilose; their length hyp.1 = 36, hyp.2 =30, hyp.3 = 24, pc. = 48. Length of movable digit of chelicera 84. Palptrochanter with small protuberances between pilose seta v2 and simple seta v1.

Legs: Coxa II with a group of six short denticles ( Fig. 1M ). Tarsus I = 163-168; tarsus IV = 180-205.

Remarks: Holoparasitus madridensis sp. nov. is most closely related to the species in which males are characterized by a trispinate gnathotectum with a slender prong and two similar short lateral spines, and by a chelicera having denticles on the inner margin of both digits and a slightly curved spermatodactyl. These are: H. mallorcae Juvara-Bals, 1975 and H. vaucheri Juvara-Bals, 2008 from Algeria and H. mahnerti Juvara-Bals, 2008 from Morocco. The new species is distinguished by the shape of its corniculus, the sharp protuberance, between setae v1 and v2 on palptrochanter and the slightly arched spermatodactyl. Females differ from other species with two protrusions on the posterior margin of the endogynium ( H. mallorcae , H. vaucheri , H. gibber Juvara-Bals & Witalinski, 2000 ) by the two protrusions being short and straight, the endogynial sac without denticles and the subapical epigynial structure formed like an ovoid disc.

Figures

Fig 1. Holoparasitus madridensis sp. nov., male (A-F, M), female (G-L, N). (A) Femur, genu, tibia of leg II. (B) Genital lamina. (C) Palptrochanter. (D) Corniculus. (E-N) Gnathotectum. (F) Chelicera, antiaxial view. (G) Presternal plate and sternal shield. (H) Epigynium. (I) Paragynium. (J-K) Endogynium. (L-M) Group of denticles on coxa II.