Origmatrachys peruensis, Kontschán, Jenő & Friedrich, Stefan, 2017

Kontschán, Jenő & Friedrich, Stefan, 2017, Contribution to the Uropodina mites of Peru (Acari: Mesostigmata), Zootaxa 4237 (2), pp. 359-370 : 361-369

Origmatrachys peruensis sp. nov.

( Figs 1–26 )

Material examined. Holotype. Female. Peru, Dept Huanuco, Yuyapichis, ACP Panguana , 9°37’S, 74°56W, 230 m, 20 September–7 October 2013, collected by S. Friedrich and F. Wachtel . Paratypes: 12 females, nine males, five deutonymphs, five protonymph and one larve. Locality and date as for holotype. Holotype and 15 paratypes (six females, four males, two deutonymphs, two protonymphs and one larva) are deposited in MUSM, 10 paratypes (three females, three males, two deutonymphs and two protonymphs) in ZSM, and 7 paratypes (three females, two males, one deutonymph and one protonymph) in NHMG.

Description. Female. Length of idiosoma 890–940, width 610–680 (n=13). Shape oval, posterior margin rounded.

Dorsal idiosoma ( Fig. 1 ). Marginal and dorsal shields fused anteriorly. Dorsal shield hypertrichous, most dorsal setae T-shaped with a long (ca 40–42) crossbar and a short base ( Fig. 2 ), two pairs of larger T-shaped setae (crossbar ca 45–48) situated at central part of dorsal shield. A pair of deep eye-like transverse furrows (ca 96–100 × 55–60) bordered with long setiform setae situated at level of coxae IV ( Fig. 3 ). Posterior to eye-like transverse furrows, some larger T-shaped setae (crossbar ca 45–48). Surface of dorsal shield covered by oval pits anterior to eye-like transverse furrows, posterior area of dorsal shield with smooth surface. One pair of strongly sclerotised cshaped grooves situated on anteriocentral area of dorsal shield, posterior to these grooves one pair large (ca 18–20 in diameter) unusual pore-like structures (or gland openings). Two pairs of similar but smaller (ca 8–10 in diameter) structures placed laterally to the larger pair ( Fig. 2 ). One pair of longitudinal grooves situated posterior to eye-like transverse furrows. Marginal shield without ornamentation, marginal setae similar in shape and length to dorsal setae.

Ventral idiosoma ( Fig. 4 ). Reticulate sculptural pattern visible close to anterior margin of sternal shield, other areas of sternal shield smooth. Sternal setae short and T-shaped (crossbar ca 24–35). Number of sternal setae 12. One pair of pores situated close to basal margin of genital shield. Two pairs of long, transverse and strongly sclerotised grooves covered by T-shaped setae situated on ventrianal shield. Irregular pits present between inner ends of second pair grooves. One pair of large T-shaped setae placed anterior and posterior to area of irregular pits. Anal area strongly sclerotised, wider than long (ca 80–84 long and ca 50–55 wide) and bearing two pairs of Tshaped setae, one pair of lyriform fissure and one pair of pores. Two pairs of pores situated on second strongly sclerotised ventral grooves and one pair on the smooth cuticle, close to T-shaped setae anterior to anal area. Numerous small T-shaped setae placed close to caudal margin. Genital shield linguliform (length 240–245, width 135–140), majority of its surface smooth, only some oval pits visible close to basal margin. Stigmata situated between coxae II and III, poststigmatid part of peritreme short, prestigmatid part long and formed two large loops. Pedofossae deep with smooth surface, an undulate line situated on pedofossae III, and the anterior margins of pedofossae IV undulate. Base of tritosternum narrow, tritosternal laciniae subdivided into four pilose branches, central ones shorter and more robust than lateral ones ( Fig. 8 ).

Gnathosoma ( Fig. 9 ). Corniculi horn-like, internal malae subdivided into several marginally pilose branches. Hypostomal setae h1 ca 33–35 long, smooth, situated near anterior margin of gnathosoma, h2 and h3 basally serrate, h2 (ca 36–40), h3 ca 20–22 and situated close to h2, h4 apically serrate and ca 21–24. Trochanter of palp with one short and smooth, and one long and serrate seta. Epistome subtriangular, with pilose margins ( Fig. 10 ). Chelicerae with one large tooth on each digit, internal sclerotised node present ( Fig. 11 ).

Legs ( Figs 12–15 ). Length of leg I 290–300, leg II 220–240, leg III 2 40 –260, leg IV 280–300. All legs bearing claws, but claws on tip of leg I shorter than the others. All femora bearing a large triangular ventral process. Setae on legs smooth and needle-like or marginally pilose.

Male. Length of idiosoma 850–930, width 580–660 (n=9). Shape of idiosoma, ornamentation and dorsal chaetotaxy as in female. Sternal shield covered by oval pits and bearing 12 pairs of T-shaped setae. Genital shield oval and situated between coxae III ( Fig. 7 ). Ventral setae, ornamentation and gnathosomal processes similar to those of female.

Deutonymph. Length of idiosoma 785–900, width 530–620 (n=5). Shape oval, posterior margin rounded.

Dorsal idiosoma ( Fig. 16 ). Dorsal shield oval (730–740 × 430–445) and separate, its surface covered by oval pits and bearing numerous T-shaped setae. One pair of large (160–170 × 115–120) and angular depressions situated close to caudal margin of dorsal shield, angular depressions with wide smooth anterior margin. One pair of marginally pilose setae (ca. 15–17) situated between these two dorsal depressions. Two rows of platelets bearing Tshaped setae situated laterally around dorsal idiosoma, the first two pairs of setae on dorsal idiosoma large and Tshaped.

Ventral idiosoma ( Fig. 17 ). Sternal shield vase-shaped, covered by irregular pits and bearing seven pairs of Tshaped setae. Surface of peritrematal, metapodal and anal shields with irregular pits. Anal shield triangular, bearing nine T-shaped setae. One pair of T-shaped setae situated on membranous cuticle anterior to anal shield. Poststigmatid part of peritreme short, prestigmatid part long with two small bends. Five pairs of T-shaped setae on small platelets situated on lateral area of ventral idiosoma, two pairs close to central part of peritreme, three pairs at level of anterior margin of metapodal shield. Base of tritosternum narrow, tritosternal laciniae subdivided into four apically pilose branches ( Fig. 18 ).

Gnathosoma ( Fig. 18 ). Corniculi horn-like, internal malae subdivided into several marginally pilose branches. Hypostomal setae h1 ca 30–32 long, smooth and situated near the anterior margin of gnathosoma, h2 smooth, h3 and h4 marginally serrate, h2 ca 70–75, h3 ca 25–27 and situated close to h2, h4 ca 30–35. Trochanter of palp with one short and smooth, and one long apically bifurcated seta. Epistome subtriangular, with pilose margins. Chelicera with one large tooth on each digit, internal sclerotised node present ( Fig. 19 ).

Protonymph. Length of idiosoma 610–710, width 430–500 (n = 5). Shape oval, posterior margin rounded.

Dorsal idiosoma ( Fig. 20 ). Dorsal shield oval (430–350 long and 280–290 wide), caudal margin convex, separated from other shields, its surface covered by oval pits and bearing 14 pairs of T-shaped setae. Pygidial shield wider than long (55–60 long, 155–160 wide), covered by oval pits and bearing one pair of marginally pilose setae (ca 23–25). One pair of row of platelets bearing T-shaped setae and one pair of row T-shaped setae situated at lateral area of dorsal idiosoma. First three pairs of setae on dorsal idiosoma large and T-shaped.

Ventral idiosoma ( Fig. 21 ). Sternal shield narrow, short, posterior end reaching to coxae III, covered by irregular pits and bearing three pairs of T-shaped setae. Surface of peritrematal, metapodal and anal shields with oval pits. Anal shield without setae, shape oval, wider than long. Two pairs of T-shaped setae situated on membranous cuticle anterior to anal shield. Poststigmatid part of peritreme absent, prestigmatid part long and straight. One pair of needle-like setae situated at level of anal opening on membranous cuticle. Base of tritosternum narrow, tritosternal laciniae subdivided into four apically pilose branches ( Fig. 22 ).

Gnathosoma ( Fig. 22 ). Corniculi horn-like, internal malae subdivided into several marginally pilose branches. Hypostomal setae h1 ca 30–32 long, smooth and situated near the anterior margin of gnathosoma, h2 with fine lateral serration, h3 and h4 marginally serrate, h2 ca 50–55, h3 ca 20–22 and situated close to h2, h4 ca 26–30. Trochanter of palp with short and smooth setae. Epistome subtriangular, with pilose margins. Chelicera with one large tooth on each digit, fixed digit with an apical sensory seta, internal sclerotised node present ( Fig. 23 ).

Larva. Length of idiosoma 460, width 310 (n=1). Shape oval, posterior margin rounded.

Dorsal idiosoma ( Fig. 24 ). Dorsal shield triangular (338 long and 270 wide) with two caudal incisions, its surface covered by irregular pits and bearing five pairs of T-shaped setae in central area, and two pairs of large Tshaped setae and two pairs of large spine-like setae (ca 110–115) on anterior and caudal margins. Three large shields (lateral ones 48 × 80, pygidial 53 × 118) situated posterior to dorsal shield, these shields not bearing setae and covered by irregular pits. One pair of marginally serrate setae situated between these shields. Opisthosoma with ten pairs of long (ca 43–45), robust and spine-like setae on small platelets situated on membranous cuticle at marginal and caudal areas of dorsal idiosoma.

Ventral idiosoma ( Fig. 25 ). Sternal shield wide, posterior end reaching coxae III, covered by irregular pits and bearing three pairs short and needle-like setae. Anal shield covered by irregular pits and bearing three short and needle-like setae around anal opening. One pair of short and needle-like and one pair of long and wide setae situated on membranous cuticle anterior to anal shield. Base of tritosternum narrow, tritosternal laciniae subdivided into four apically pilose branches ( Fig. 26 ).

Gnathosoma ( Fig. 26 ). Corniculi horn-like, internal malae subdivided into several marginally pilose branches. Two pairs of hypostomal setae present, anterior pair ca. 22–24 long, smooth and situated near the anterior margin of gnathosoma, posterior pair with some lateral spines and ca. 12–14.

Etymology. The name of the new species refers to the country where was collected.

Figures

FIGURES 1 – 3. Origmatrachys peruensis sp. nov. holotype, female. 1. Body in dorsal view. 2. Dorsal setae and ornamentation. 3. Transverse furrow and its region on dorsal shield.

FIGURES 4 – 7. Origmatrachys peruensis sp. nov. holotype, female. 4. Body in ventral view. 5. Caudal area. 6. Intercoxal area. 7. Intercoxal area of male paratype.

FIGURES 8 – 15. Origmatrachys peruensis sp. nov. holotype, female. 8. Tritosternum. 9. Ventral view of gnathosoma and first two segments of palp. 10. Epistome. 11. Lateral view of chelicera. 12. Leg I in ventral view. 13. Leg II in ventral view. 14. Leg III in lateral view. 15. Leg IV in lateral view.

FIGURES 16 – 19. Origmatrachys peruensis sp. nov. paratype, deutonymph. 16. Body in dorsal view. 17. Body in ventral view. 18. Ventral view of gnathosma, tritosternum, palp and first two segments of leg I. 19. Lateral view of chelicera.

FIGURES 20 – 23. Origmatrachys peruensis sp. nov. paratype, protonymph. 20. Body in dorsal view. 21. Body in ventral view. 22. Ventral view of gnathosma, tritosternum, palp and first two segments of leg I. 23. Lateral view of chelicera.

FIGURES 24 – 26. Origmatrachys peruensis sp. nov. paratype, larva. 24. Body in dorsal view. 25. Body in ventral view. 26. Ventral view of gnathosma, tritosternum, palp and first two segments of leg I.