Gephyrazetes umukusumae, Ermilov & Starý, 2018

Ermilov, Sergey G. & Starý, Josef, 2018, To the knowledge of the genus Gephyrazetes (Acari, Oribatida, Mochlozetidae), Ecologica Montenegrina 16, pp. 34-41 : 35-40

Gephyrazetes umukusumae sp. nov. ( Figs 1–11 )

https://zoobank.org/ urn:lsid:zoobank.org:act:540B3192-017E-408D-879A-F0546DC6BFFF

Diagnosis. Body size: 1045–1095 × 830–863. Lamellae with trapezoid cusps. Translamella present, thick. Rostral, lamellar and interlamellar setae setiform, sparsely barbed. Bothridial setae setiform, slightly barbed. Four pairs of porose areas very small, rounded. Notogastral setae of medium size, setiform, smooth. Custodia narrowly triangular. Discidia triangular. Circumpedal carinae connected to custodia. Epimeral and anogenital setae setiform, barbed. Adanal lyrifissure locate close and parallel to anal plates. Marginoventral porose area complete, band-like.

Description. Measurements. Body length: 1045 (holotype, female), 1095 (paratype, female); notogaster width: 863 (holotype), 830 (paratype).

Integument ( Fig. 3 ). Body color brown. Surface microporose, lateral sides of prodorsum close to lamellae densely tuberculate (diameter of tubercles up to 8).

Prodorsum ( Figs 1 , 3 ). Rostrum rounded dorsally, but distinctly projected in lateral view. Lamellae slightly shorter than half of prodorsum, with well developed trapezoid cusps. Translamella thick. Sublamellae longer than half of lamellae. Sublamellar porose areas absent. Tutoria short, ridge-like. Rostral (102–110), lamellar (118–127) and interlamellar (200–209) setae setiform, sparsely barbed. Exobothridial setae (45) setiform, thin, smooth. Bothridial setae (217–225) setiform, slightly barbed. Dorsophragma slightly elongated longitudinally. Dorsosejugal porose areas absent.

Notogaster ( Figs 1–4 ). Pteromorphs well developed, broadly rounded laterally. Four pairs of porose areas very small, rounded, similar in diameter (8), with distinct borders. Fourteen pairs of notogastral setae (c 2, la, 118–127; others, 77–86) setiform, thin, smooth. All lyrifissures and opisthonotal gland opening clearly visible, ips and ih slightly distanced from each other.

Gnathosoma ( Figs 5–7 ). Subcapitulum longer than wide (201–209 × 176–184). Three pairs of subcapitular setae setiform, h (61–65) and m (69–73) barbed, longer than a (36) shortly ciliated. Two pairs of adoral setae (16) slightly thickened, barbed. Palps with length of 127–131. Postpalpal setae (8) spiniform, smooth. Chelicerae (201–209) with two setiform setae, cha (53–57) ciliate, chb (41–45) barbed.

Epimeral and lateral podosomal regions ( Figs 2 , 3 ). Humeral porose areas Am and Ah fused, diffuse, poorly visible, elongate oval. Custodia present, strong, elongate and narrowly triangular. Discidia triangular. Circumpedal carinae connected to custodia. Epimeral setae setiform, slightly barbed, 3b, 3c, 4c (102–110) longer than 1b, 1c, 4a, 4b (61–65) and 1a, 2a, 3a (36–41).

Anogenital region ( Figs 2–4 ). Four pairs of genital (36–41), one pair of aggenital (36–41), two pairs of anal (57–61) and three pairs of adanal (57–65) setae setiform, thin, slightly barbed. Adanal lyrifissure locate close and parallel to anal plates. Setae ad 3 inserted anterior to iad. Marginoventral porose area complete, band-like.

Legs ( Figs 8–11 ). Median claw thicker than laterals, all barbed on dorsal side; lateral claws each with small tooth ventrodistally. Trochanters III and IV without teeth anterodorsally. Formulas of leg setation and solenidia: I (1–5–3–4–20) [1–2–2], II (1–5–3–4–15) [1–1–2], III (2–3–1–3–15) [1–1–0], IV (1–2–2–3–12) [0–1–0]; homology of setae and solenidia indicated in Table 1 . Solenidia ω 1 on tarsi I, ω 1 and ω 2 on tarsi II and σ on genua III bacilliform, other solenidia setiform. Famulus of tarsi I short, erect, dilated distally, inserted posterior to solenidion ω 2.

Type deposition. The holotype (in ethanol with drop of glycerol) is deposited in SMNH . The paratype (in ethanol with drop of glycerol) is deposited in TSUMZ .

Etymology. The species name is dedicated to the well-known acarologist Dr. Umukusum Ya. Shtanchaeva (Universidad Complutense de Madrid, Madrid, Spain), to acknowledge her extensive contributions to our knowledge of oribatid mites.

Remarks. The known species of Gephyrazetes – G. umukusumae sp. nov. and G. fasciatus Hirauchi, 1999 –can be distinguished by morphological traits listed in Table 2 .

Figures

Figure 1. Gephyrazetes umukusumae sp. nov., adult: Dorsal view (legs not illustrated). Scale bar 100 μm

Figure 2. Gephyrazetes umukusumae sp. nov., adult: Ventral view (gnathosoma and legs not illustrated). Scale bar 100 μm

Figures 3–7. Gephyrazetes umukusumae sp. nov., adult: 3 – anterior part of body, lateral view (gnathosoma and legs not illustrated); 4 – posterior part of body, lateral view; 5 – subcapitulum, ventral view; 6 – palp, right, antiaxial view; 7 – anterior part of chelicera, right, antiaxial view. Scale bars 100 μm (3, 4), 40 μm (5), 20 μm (6), 30 μm (7).

Figures 8–11. Gephyrazetes umukusumae sp. nov., adult: 8 – leg I, without trochanter and basal part of femur, right, antiaxial view 9 – femur (without basal part) and genu of leg II, right, antiaxial view; 10 – trochanter, femur and genu of leg III, left, antiaxial view; 11 – leg IV (tibial solenidion broken), left, antiaxial view. Scale bar 50 μm.