Scheloribates (Topobates) panamaensis, Ermilov, 2020

Ermilov, S. G., 2020, A new species of the subgenus Scheloribates (Topobates) (Acari: Oribatida: Scheloribatidae) from Panama, Zoosystematica Rossica (China) 29 (2), pp. 278-283 : 279-283

Scheloribates (Topobates) panamaensis

sp. nov.

( Figs 1–10)

Holotype. Male (in ethanol with a drop of glycerol), Panama, Bocas del Toro, Cayo Agua I., leaf litter, July 2006, R. Saporito leg. ( USNM).

Paratypes. Two females (in ethanol with a drop of glycerol), same data as for holotype ( TSUMZ) .

Diagnosis. Body size: 929–1062 × 763–898. Prolamella, sublamella and lateral keel-shaped ridge present. Rostral, lamellar and interlamellar setae long, setiform; ro shortest, in longest. Bothridial seta long, spindle-form, with short, thin apex. Fourteen pairs of notogastral setae short, setiform, with short attenuate tip, thin, smooth. Epimeral and anogenital setae short, setiform, thin, roughened. Leg femora II–IV with triangular process ventrodistally; trochanter III with triangular process posteriorly.

Description. Measurements. Body length: 929 (holotype, male), 1045, 1062 (two paratypes, two females); notogaster width: 763 (holotype), 879, 898 (two paratypes).

Integument. Body color brown to dark brown. Cuticle densely microporose (visible under high magnification, ×1000). Lateral side of body partially with microgranulate cerotegument.

Note. Roman letters refer to normal setae, Greek letters to solenidia (except ɛ = famulus). Single quotation mark (’) designates setae on the anterior and double quotation mark (”) setae on the posterior side of a given leg segment. Parentheses refer to a pair of setae.

Prodorsum. Rostrum narrowly rounded. Lamella about 1/2 length of prodorsum, simple. Prolamella linear, reaching insertion of rostral seta. Sublamella linear, similar to lamella in length. Sublamellar porose area (20–24 × 16) oval, partially covered by sublamella. Lateral keel-shaped ridge distinct. Rostral seta (94–102) setiform, distinctly barbed. Lamellar (184–205) and interlamellar (246–258) setae setiform, slightly barbed. Exobothridial seta (61–65) setiform, roughened. Bothridial seta (135–139) with long stalk and shorter, spindle-form, slightly barbed head having short, thin apex. Bothridium cuplike. Dorsosejugal porose area (32–41 × 8–10) elongate oval. Dorsophragma slightly elongate.

Notogaster. Fourteen pairs of notogastral setae (36–49) setiform, with short attenuate tip, thin, smooth, often broken. Four pairs of sacculi droplike. Opisthonotal gland opening, circumgastric sigillar band and all lyrifissures distinct.

Gnathosoma. Subcapitulum longer than wide (188–205 × 155–164). All subcapitular setae setiform, slightly barbed; h (57–61) longer than m (20) and a (36–41); m thinnest. Adoral seta (20) setiform, barbed. Palp (114–123) with typical setation 0-2-1-3-9 (+ω). Postpalpal seta (8) spiniform, smooth. Chelicera (205–225) with two setiform, barbed setae (cha: 57–65; chb: 36–45). Trägårdh’s organ elongate triangular.

Epimeral and lateral podosomal regions. With typical epimeral formula (3-1-3-3). All epimeral setae (1a, 2a, 3a, 4b: 32–41; 1c, 3b, 4a: 45–53; 1b, 3c, 4c: 61–69) setiform, thin, roughened. Humeral porose areas Am and Ah elongate oval, poorly visible. Pedotecta I and II represented by small lamina. Discidium broadly rounded. Circumpedal carina comparatively very short.

Anogenital region. Four pairs of genital (g 1: 41–53; others: 32–41), one pair of aggenital (32– 41), two pairs of anal (45–53) and three pairs of adanal (45–53) setae setiform, thin, roughened. Adanal lyrifissure distinct. Marginal porose area band-like, complete. Preanal organ goblet-like. Ovipositor elongate (323 × 94), blade (118) short- er than length of distal section (beyond middle fold; 205). Each of the three blades with four smooth setae, ψ 1 ≈ τ 1 (69) setiform, ψ 2 ≈ τ a ≈ τ b ≈ τ c (32) narrowly thorn-like. Six coronal setae (4) spiniform.

Leg. Median claw distinctly thicker than lateral claws, all barbed on dorsal side. Lateral claw with minute tubercle ventrodistally. Tibiae I and II with slightly developed tubercle ventroproximally. Femora II–IV with triangular process ventrodistally. Trochanter III with triangular process posteriorly. Typical ventroproximal and ventrodistal porose area well visible on each tarsus and each tibia, respectively. All femora with dorsoparaxial porose area. Formulas of leg setation and solenidia: I (1-5-3-4-19) [1-2-2], II (1-5-2-4-15) [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. Famulus of tarsus I short, erect, slightly dilated and blunt distally, inserted posterior to solenidion ω 2. Solenidion ω 1 on tarsus I, ω 1 and ω 2 on tarsus II and σ on genu III slightly bacilliform, other solenidia setiform.

Comparison. Scheloribates (Topobates) panamaensis sp. nov. is morphologically most similar to S. (T.) tanzanicus ( Mahunka, 1993) from Tanzania (see Mahunka, 1993) and S. (T.) ultraforaminosus ( Lee & Pajak, 1988) from Australia (see Lee & Pajak, 1988) in having spindle-form bothridial seta and 14 pairs of short notogastral setae. However, the new species differs from its related species by the presence of very large body length (929–1062 versus 452–512 in S. (T.) tanzanicus and 515–586 in S. (T.) ultraforaminosus ) and strong ventrodistal process on leg femora II– IV (versus femoral process absent in S. (T.) tanzanicus and S. (T.) ultraforaminosus ).

Etymology. The species name panamaensis refers to the country, Panama, where the new species was collected.