Umashtanchaeviella plethotricha, Ermilov, Sergey G., Anichkin, Alexander E. & Tolstikov, Andrei V., 2014

Ermilov, Sergey G., Anichkin, Alexander E. & Tolstikov, Andrei V., 2014, Umashtanchaeviella plethotricha, a new genus and species of the family Tetracondylidae (Acari, Oribatida), ZooKeys 408, pp. 51-59 : 53-55

Umashtanchaeviella plethotricha sp. n. Figures 1-7

Diagnosis.

With character states of Umashtanchaeviella gen. n. as listed above. Body surface microfoveolate and microgranulate; surface of dorsal part of prodorsum, lateral sides of notogaster, anterior part of epimere I, anogenital region and anal plates tuberculate. Genital plates striate. Rostral, lamellar and interlamellar setae long, barbed. Bothridial setae with long stalk and short, weakly developed, lanceolate, head. Exobothridial setae short. Medial prodorsal and notogastral condyles absent; lateral prodorsal and notogastral condyles triangular. Ten pairs of notogastral setae setiform, barbed. More than 250 pairs of short, thin plethotrichial setae on notogaster. Epimeral and anogenital setae setiform, barbed. Adanal setae ad1 shorter than ad2, ad3. Lyrifissures iad located in paraanal position. Formula for leg setae u: L–S–S–S.

Description.

Measurements. Body length 614 (holotype), 630 (paratype); body width 348 (holotype), 365 (paratype).

Integument. Body color light brown. Body surface densely microfoveolate (diameter of foveolae less than 1) and microgranulate (granules elongate, length less than 1). Surface of dorsal part of prodorsum, lateral sides of notogaster, anterior part of epimere I, anogenital region and anal plates tuberculate (tub, diameter of tubercles up to 6). Genital plates with thin and numerous stria.

Prodorsum. Rostrum widely rounded. Costulae (cos) well developed, reaching the insertions of lamellar setae and protruding anteriad. Rostral (ro, 77-82), lamellar (le, 77-82) and interlamellar (in, 155-164) setae setiform, barbed. Bothridial setae (ss, 155-164) with long stalk and short, weakly developed, lanceolate, indistinctly barbed head. Exobothridial setae (ex) shortest (20), thin, slightly barbed. Medial prodorsal condyles absent. Lateral prodorsal condyles (co.pl) triangular, rounded distally.

Notogaster. Medial notogastral condyles absent. Lateral notogastral condyles (co.nl) large, triangular, rounded distally, connected to lateral prodorsal condyles. Notogaster has a normal complement of typical, identifiable setae, but with an underlying plethotrichy of minute setae. Ten pairs of notogastral setae well developed, setiform, barbed; medial setae la, lm shorter (73-86) and thinner than other setae (164-176). Distance between setae h1-p1 longer than p1-p2. Plethotrichial setae (ps, more 250 pairs) short (12), thin, straight, smooth, set on small tubercles (insertions of setae visible in high magnification). Lyrifissures ia, im and opisthonotal gland openings (gla) distinct; ip, ih, ips indistinctly developed.

Gnathosoma. Morphology of subcapitulum, palps and chelicerae typical for most Tetracondylidae (for example, see Ermilov et al. 2010; Ermilov and Kalúz 2013). Subcapitulum longer than wide (139 × 86). Subcapitular setae setiform, slightly barbed; a (20) shorter than m and h (both 36-41). Adoral setae and their alveoli absent. Palps (86) with setation 0 –2–1–3– 8(+ω). Solenidion pressed to the palptarsus surface in medio-basal part and distal seta in distal part. Chelicerae (139) with two barbed setae; cha (49) longer than chb (24). Trägårdh’s organ distinct.

Epimeral and lateral podosomal regions. All apodemes (1, 2, sejugal, 3) well visible, Apodemes 4 absent. Epimeral setae setiform, slightly barbed. Setae 1a, 2a, 3a, 4b shortest (16-20); 4c (36-41) and 1b, 1c, 3b, 3c (49) longer; 4a longest (65-69). Pedotecta I (Pd I) and II (Pd II) well developed. Discidia (dis) triangular, pointed anteriorly.

Anogenital region. Four pairs of genital (g1-g4, 20-24), one pair of aggenital (ag, 41-45), three pairs of adanal (ad1, 65; ad2, ad3, 90-94) and two pairs of anal (an1, an2, 49-57) setae setiform, barbed. Adanal setae ad1 located in postanal position, ad2, ad3 in adanal position. Distance between setae ad3-ad3 longer than ad2-ad2 and ad1-ad1. Lyrifissures iad short, located in paraanal position.

Legs. Claw of each tarsus smooth. Tarsi without teeth. Formulae of leg setation and solenidia: I (1 –4–3–4– 16) [1 –2– 2], II (1 –4–3–3– 15) [1 –1– 2], III (2 –3–1–2– 15) [1 –1– 0], IV (1 –2–2–2– 12) [0 –1– 0]; homology of setae and solenidia as indicated in Table 1. Morphology of leg segments, setae and solenidia typical for Tetracondylidae (for example see Ermilov et al. 2010; Ermilov and Kalúz 2013). Leg setae u setiform (L-type) on tarsi I and thorn-like on tarsi II–IV (S-type).

Type deposition.

The holotype is deposited in the collection of the Zoological Institute of the Russian Academy of Sciences, St. Petersburg, Russia; one paratype is in the collection of the Tyumen State University Museum of Zoology, Tyumen, Russia.

Etymology.

The specific name plethotricha refers to the presence of plethotrichial setae on notogaster.