Sadocepheus donvictorianoensis Ermilov & Corpuz-Raros, 2017

Ermilov, Sergey G. & Corpuz-Raros, Leonila, 2017, To the knowledge of the genus Sadocepheus (Acari, Oribatida, Compactozetidae), Ecologica Montenegrina 11, pp. 28-36 : 29-34

Sadocepheus donvictorianoensis Ermilov & Corpuz-Raros sp. nov.

( Figs 1–10 )

Diagnosis. Body size: 747–780 × 630. Lamellae bifurcate distally, with long medial and short lateral teeth. Bothridial setae long, brush-shaped. Humeral regions of notogaster triangularly pointed. Notogastral setae smooth, p 2, p 3, h 1, p 1 short, other setae of medium size. Epimeral and anogenital setae setiform, smooth.

Adanal setae long, shorter than length of anal plates. Leg claws slightly barbed on dorsal side. Leg trochanters III, IV with strong tooth dorsoanteriorly.

Description. Measurements. Body length: 780 (holotype, female), 747, 780 (two paratypes, female and male, respectively); notogaster width: 630 (holotype and two paratypes).

Integument ( Figs 1 , 4 ). Body color light dark brown. Amorphous cerotegument well-developed. Body surface densely microfoveolate (visible under high magnification in dissected specimens). Lamellae indistinctly rugose. Subcapitular mentum with several ridges. Notogaster with granulate band (diameter of granules up to 4) posterolaterally, humeral regions also granulate.

Prodorsum ( Figs 1 , 3 , 5 ). Rostrum narrowly rounded. Lobe with large median inner rostral tooth. Lamellae bifurcate distally, with long medial and short lateral teeth and semi-oval indentation between them. Rostral setae (28–32) setiform, thin, smooth, pressed to surface of the prodorsum. Lamellar setae (86–94) setiform, thickened, barbed, directed medially. Interlamellar setae (32–41) setiform, smooth. Exobothridial setae and their alveoli absent. Bothridial setae (102–114) with long stalk and short, brush-like head. Exobothridial setae and their alveoli absent. Tutoria ridge-like.

Notogaster ( Figs 1 , 3, 4 ). Anterior margin of notogaster slightly developed, concave medially. Humeral regions triangularly pointed. Ten pairs of notogastral setae, setiform, smooth, inserted on the notogastral surface; p 2, p 3 (20–24), h 1, p 1 (28–32) shorter and thinner than others (65–69). Lyrifissures im, ip, ih, ips and opisthonotal gland openings well visible, ia not evident.

Gnathosoma ( Figs 2 , 6–8 ). Subcapitulum longer than wide (180–192 × 123–139). Subcapitular setae setiform, smooth, m (20–24) shorter and thinner than a and h (32). Adoral setae (16) setiform, smooth. Palps (82) with typical setation 0–2–1–3–9(+ω). Postpalpal setae (6) spiniform, smooth. Axillary saccules distinct, slightly elongated. Chelicerae (159–168) with two setiform, barbed setae (32). Trägårdh’s organ distinct, granulate.

Epimeral and lateral podosomal regions ( Figs 2 , 3 ). Apodemal border II and sejugal border complete, apodemal border III not visible. Epimeral setae setiform, smooth, 1a, 1b, 1c, 2a, 3a (16–20) shorter and thinner than 3b, 4a (45–53), 3c, 4a, 4c (57–65). Pedotecta I, II and discidia of typical morphology for the genus.

Anogenital region ( Figs 2 , 4 ). Six pairs of genital (16–20), one pair of aggenital (16–20), three pairs of adanal (ad 1, ad 2, 61–69, ad 3, 49–53) and two pairs of anal (10–12) setae setiform, smooth. Adanal lyrifissures located slightly inverse apoanal.

Legs ( Figs 9–10 . Claw of each leg slightly barbed on dorsal side. Trochanters III, IV with strong tooth dorsoanteriorly. Porose areas on femora I, II, femora III, IV and trochanters III, IV poorly visible. Formulas of leg setation and solenidia: I (1–4–3–4–19) [1–2–2], II (1–4–3–4–16) [1–1–2], III (2–3–1–3–15) [1–1–0], IV (1–2–2–2–12) [0–1–0]; homology of setae and solenidia indicated in Table 1 . Majority of solenidia were broken. Famuli short, erect, swollen and blunt distally, inserted lateral to solenidia ω 1. Setae setiform, smooth or slightly barbed.

Type deposition. The holotype (female) and two paratypes (female and male) are deposited (ethanol with drop of glycerol) in TSUMZ .

Etymology. The specific name “ donvictorianoensis ” refers to Don Victoriano, the Philippine municipality (in Misamis Occidental Province, Mindanao Island), where holotype and one paratype of the new species were discovered.

Remarks. Sadocepheus donvictorianoensis Ermilov & Corpuz-Raros sp. nov. is morphologically most similar to Sadocepheus elevatus Mahunka, 1987 from Borneo in having bifurcate lamellae and long adanal setae. However, the new species differs from the latter by the larger body size (747–780 × 630 versus 542–591 × 486–518), long medial and short lateral teeth of the lamellae (versus teeth similar in length) and setiform adanal setae shorter than length of anal plates (versus adanal setae flagellate, longer than length of anal plates.

Figures

Figure 1. Sadocepheus donvictorianoensis Ermilov & Corpuz-Raros sp. nov., adult: Dorsal view (legs not illustrated). Scale bar 100 μm.

Figure 2. Sadocepheus donvictorianoensis Ermilov & Corpuz-Raros sp. nov., adult: Ventral view (legs not illustrated). Scale bar 100 μm.

Figures 3–4. Sadocepheus donvictorianoensis Ermilov & Corpuz-Raros sp. nov., adult: 3 – anterior part of body, lateral view (legs, gnathosoma and epimeral region not illustrated); 4 – posterior view. Scale bar 100 μm.

Figures 5–10. Sadocepheus donvictorianoensis Ermilov & Corpuz-Raros sp. nov., adult: 5 – rostrum, anterior view; 6 – subcapitulum, ventral view; 7 – palptasus, left, paraxial view; 8 – chelicera, left, paraxial view; 9 – trochanter, femur and genu of leg III, left, antiaxial view; 10 – leg IV (tibial solenidion broken), left, antiaxial view. Scale bars 60 μm (5, 9, 10), 15 μm (6–8).