Mucrobates venezuelaensis Ermilov, 2024, sp. nov.
Creators: name: Ermilov, Sergey G.
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Sarcoptiformes
Hemileiidae
Mucrobates
Mucrobates venezuelaensis

description: Mucrobates venezuelaensis sp. nov. (Figs. 11–20)
http://zoobank.org/ urn:lsid:zoobank.org:act: 33A2B863-A9F2-4524-A3EC-E0C176F88FFE
Type material
Holotype (male) and two paratypes (two females): Western Venezuela, Merida State, 2300 m a.s.l., 10 km E Tabay, sweeping in the cloud forest, 28.IV.1981 (L. Masner and Marsh).
Type deposition
The holotype is deposited in the collection of the Senckenberg Museum of Natural History, Görlitz, Germany; two paratypes are deposited in the collection of the University of Tyumen, Museum of Zoology, Tyumen, Russia. All specimens are preserved in 70% solution of ethanol with a drop of glycerol.
Diagnosis
Body length: 600–690. Prolamella not complete (distal part not observable), directed slightly laterally to insertion of rostral seta; translamella absent; keel-shaped ridge present. Rostral, lamellar and interlamellar setae setiform, barbed; in˃le˃ro; bothridial seta short, clavate, barbed; exobothridial seta well developed. Notogastral setae p 2, p 3 short, setiform, slightly roughened; other setae vestigial. Epimeral and anogenital setae setiform, slightly roughened. Pedotectum II present. Adanal seta ad 1 located behind anal aperture. Seta v’ on leg genu II developed.
Description
Measurements – Body length: 600 (holotype), 675, 690 (paratypes); notogaster width: 375 (holotype), 405, 420 (paratypes).
Integument – Body color brown. Cuticle densely microporose (visible under high magnification, × 1000); lateral side of body partially densely microgranulate.
Prodorsum – Rostrum rounded. Lamella slightly shorter than half of prodorsum; prolamella not complete (distal part not observable), directed slightly laterally to insertion of rostral seta; translamella absent; sublamella absent; sublamellar porose area (4) rounded; keel-shaped ridge slightly developed, small. Rostral (94–105), lamellar (131–150) and interlamellar (217–225) setae setiform, barbed; bothridial seta (49–52) clavate, barbed, with head slightly longer than stalk; exobothridial seta (37–41) setiform, slightly roughened. Dorsosejugal porose area (8 × 4) oval. Dorsophragma slightly elongated.
Notogaster – Posterior notogastral setae p 2, p 3 (11–15) setiform, slightly roughened; other setae (1) vestigial. Four pairs of saccules drop-like. Opisthonotal gland opening and all lyrifissures distinct.
Gnathosoma – Subcapitulum size: 135–146 × 94–97; subcapitular seta a (19–22) setiform, shortly ciliated distally; m (19–22) setiform, slightly roughened; h (36–41) setiform, barbed; m thinnest; both adoral setae (19–22) setiform, barbed. Palp length: 94–97; setation: 0–2–1–3–9(+ω); postpalpal seta (11) spiniform, roughened. Chelicera length: 135–146; both cheliceral setae (cha: 37– 41; chb: 26) setiform, barbed.
Epimeral and lateral podosomal regions – Epimeral setal formula: 3–1–3–3; all setae (1a, 2a, 3a: 26–30; 3c, 4c: 49–55; others: 37–41) setiform, slightly roughened; 3c on carina located perpendicularly to pedotectum II; 4c on discidium. Humeral porose areas Am and Ah fused into single elongate oval area. Pedotectum II developed, small. Discidium broadly triangular, with rounded top.
Anogenital region – Anogenital formula: 4–1–2–3; genital (22–30), aggenital (22–30), anal (22– 30), and adanal (36–41) setae setiform, slightly roughened; ad 1 posteriorly to anal aperture. Adanal lyrifissure located close and parallel to anterior half of genital plate. Marginal porose area represented by some elongate oval areas.
Legs – Median claw distinctly thicker than lateral claws; all claws slightly barbed on dorsal side; lateral claw with minute tubercle ventrodistally. Anterodorsal process on tibiae III and IV well developed. Porose area on tarsi I–IV, tibiae I–IV, femora I–IV, and trochanters III, IV well observable. The extreme proximoventral region of femora I–IV contains a well-circumscribed, discrete globule that is resistant to lactic-acid treatment; each globule contains a cluster of 15–20 minute, discrete granules that are similarly resistant. Formulas of leg setation and solenidia: I (1–5– 3–4–19) [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 2; setae p’, p” on tarsus I eupathidial; seta s on tarsus I setiform, barbed (not eupathidial).
Note: See Table for explanations.
Comparison
Mucrobates venezuelaensis sp. nov. is morphologically similar to M. cayoaguaensis Ermilov & Kontschán, 2021 from Panama in having clavate bothridial seta. However, the new species is distinguished from the latter by larger body size (length: 600–690 versus 423–481), short bothridial seta (versus comparatively long), well developed exobothridial seta (versus minute), the presence (versus absence) of the pedotectum II, keel-shaped ridge and seta v’ on the leg genu II, and the location of the adanal seta ad 1 (posteriorly to anal aperture versus laterally to anal aperture).
Etymology The species name venezuelaensis refers to the place of origin, Venezuela.
description: Published as part of Ermilov, Sergey G., 2024, New species of oribatid mites (Acari, Oribatida) from Western Venezuela, pp. 745-755 in Persian Journal of Acarology 13 on pages 749-753, DOI: 10.22073/pja.v13i4.86025, http://zenodo.org/record/14668604