Brachioppiella (Brachioppiella) sanettiensis Ermilov, 2024

Brachioppiella (Brachioppiella) sanettiensis Ermilov n. sp.

Zoobank: A4524778-4801-4B0C-8C6C-F478BF96415E

( Figures 2 View Figure 2 , 3 View Figure 3 )

Type material — Holotype (male) and two paratypes (two males): Ethiopia, Oromia region, Bale Zone, Bale Mountains National Park , 06°46′17.2″N, 039°45′22.1″E, 3503 m a.s.l., GoogleMaps

Sanetti Plateau, bushes of Erica arborea , mosses Breutelia borbonica and litter, 6.XI.2023

(L.B. Rybalov).

The holotype is deposited in the collection of the Senckenberg Museum of Natural History, Görlitz, Germany ; two paratypes are in the collection of the Tyumen State University Museum of Zoology, Tyumen, Russia. All specimens are preserved in 70% solution of ethanol with a drop of glycerol.

Diagnosis — Body length: 405–420. Costular-transcostular complex absent. Rostral, lamellar and interlamellar setae setiform, slightly barbed; ro medium-sized, le and in short; bothridial seta long, with elongate, slightly unilaterally dilated head having five or six dorsal tines. Interbothridial region with two pairs of muscle sigillae. Notogastral seta c represented by microseta; other setae medium-sized, setiform, shortly and sparsely ciliate; la located posterolateral to lm. Subcapitular setae a, m as well as all genital, aggenital, anal setae and epimeral setae 1a, 1c, 2a, 3a, 4b roughened; subcapitular seta h as well as all adanal setae and epimeral setae 1b, 3b, 3c, 4a, 4c shortly and sparsely ciliate. Discidium rounded distally. Leg tarsus II with 17 setae including l″, v′.

Description — Measurements. Body length: 405 (holotype), 405, 420 (paratypes); body width: 195 (holotype), 195, 210 (paratypes).

Integument — Body color light brown. Body surface mostly indistinctly microfoveolate (visible under high magnification, × 1000); lateral side of body between bothridium and acetabula I–III densely tuberculate (diameter of tubercle up to 2).

Prodorsum ( Figs 2 View Figure 2 (a, d)) — Rostrum rounded. Costular-transcostular complex absent but two thin lineate longitudinal structures indistinctly observable instead costulae. Rostral (37–41), lamellar (15–19) and interlamellar (15–19) setae setiform, slightly barbed; exobothridial seta (9–11) setiform, roughened, inserted on small tubercle; bothridial seta (56–60) with long stalk and elongate, slightly unilaterally dilated head having five or six outer tines. Interbothridial tubercle absent; postbothridial tubercle slightly developed. Interbothridial region with two pairs of large muscle sigillae.

Notogaster ( Figs 2 View Figure 2 (a, c, d)) — Anterior notogastral margin convex medially. Notogastral seta c represented by microseta; other setae setae (30–34) setiform, shortly and sparsely ciliate;

la located posterolateral to lm. Opisthonotal gland opening and all lyrifissures distinct.

Gnathosoma ( Figs 3 View Figure 3 (a–c)) — Subcapitulum size: 94–101 × 71–79; subcapitular setae a (17–19) and m (17–19) setiform, roughened; subcapitular seta h (24–26) setiform, shortly and sparsely ciliate; both adoral setae (7) setiform, smooth. Palp length: 60–64; setation: 0–2–1–3–9(+ω); solenidion long (3/4 of tarsus), slightly thickened, rounded distally, pressed to surface; postpalpal seta (4) spiniform, smooth. Chelicera length: 94–101; seta cha (30–32) setiform, barbed; seta chb (13–15) setiform, slightly barbed.

Epimeral and lateral podosomal regions ( Figs 2 View Figure 2 (b, d)) — Epimeral setal formula: 3–1–3–3; setae 1a, 1c, 2a, 3a, 4b (15) setiform, roughened; 3c (39–41), 1b, 3b, 4a, 4c (30–34) setiform, shortly and sparsely ciliate. Discidium broadly triangular, rounded distally.

Anogenital region ( Figs 2 View Figure 2 (b–d)) — Anogenital formula: 5–1–2–3; genital (11), aggenital (15–19) and anal (15–19) setae setiform, roughened; adanal setae (30–34) setae setiform, shortly and sparsely ciliate. Adanal lyrifissure oblique (inverse apoanal).

Legs ( Figs 3 View Figure 3 (d–g)) — Claw of each leg smooth. Dorsoparaxial porose area on trochanters

III, IV and ventroparaxial porose area on femora I–IV present but slightly visible. Formulas of leg setation and solenidia: I (1–5–2–4–20) [1–2–2], II (1–5–2–4–17) [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 ; setae

p′ and p″ eupathidial on tarsus I versus spiniform (poorly observable) on tarsi II–IV; seta s eupathidial on tarsus I, located between paired setae u and a ; solenidia ω 1, ω 2 on tarsi I, II and

σ on genu III slightly thickened, rounded distally versus others solenidia rod-like.

– chelicera, right, antiaxial view; d – leg I, right, antiaxial view; e – leg II, right, antiaxial view; f – leg III, left, antiaxial view; g – leg IV, left, antiaxial view. Scale bars 10 μm (b), 20 μm (a, c), 50 μm (d–g).

Remarks — In having medium-sized body, slightly unilaterally dilated bothridial setal head bearing a few dorsal tines, the length of the prodorsal setae ro medium-sized (; le and in short; bs long) and in the absence of the costular-transcostular complex, B. (B.) sanettiensis Ermilov n. sp. is similar to B. (B.) biseriata (Balogh and Mahunka, 1975) from Australia and Vietnam. However, the new species can be distinguished from the latter by the location of the notogastral seta la (posterolateral to lm versus anterior to lm), the size and number of the interbothridial muscle sigillae (two pairs large versus three pairs small), and the morphology of the remaining notogastral setae (shortly and sparsely ciliate versus smooth).

Etymology — The species name sanettiensis refers to the place of origin, Sanetti Plateau.