Fissicepheus striganovae, Ermilov, Sergey G. & Anichkin, Alexander E., 2014

Ermilov, Sergey G. & Anichkin, Alexander E., 2014, Taxonomic study of oribatid mites (Acari, Oribatida) of Bi Dup — Nui Ba National Park (southern Vietnam), Zootaxa 3834 (1), pp. 1-86 : 36

Fissicepheus striganovae sp. nov.

( Figures 22–24 )

With characters of the genus Fissicepheus Balogh & Mahunka, 1967 as summarized by Balogh & Mahunka (1967), Aoki (1967).

Diagnosis. Body size 481–581 × 182–232. Tip of costulae simple. Rostral and lamellar setae setiform, indistinctly serrate. Interlamellar, notogastral and ano-adanal setae dilated in medial part, barbed. All medial and lateral condyles present, triangular. Epimeral setal formula: 2–0–2–3. Genital plates with some longitudinal stria. Adanal setae ad 3 in paraanal position. Lyrifissures iad in lateral position. Leg setae u setiform on all tarsi.

Description. Measurements. Body length 564 (holotype: female), 481, 581 (two paratypes: female and male); body width 215 (holotype), 182, 232 (two paratypes).

Integument. Body color yellow-brownish. Body surface densely microfoveolate (diameter of foveolae less than 1) and with larger sparse foveolae (their diameter up to 4), but foveolae visible only at high magnification in dissected specimens. Genital plates with some longitudinal stria.

Prodorsum. Rostrum widely rounded. Rostral (49–61) and lamellar (65–73) setae setiform, indistinctly serrate (visible under high magnification). Interlamellar setae (20–28) dilated in medial part, barbed, inserted dorsomedially to bothridial openings. Bothridial setae (57–65) with long stalk and small, barbed, distally rounded head. Exobothridial setae (6–8) setiform, smooth. Medial and lateral prodorsal condyles triangular, rounded distally, located separately.

Notogaster. Anterior notogastral margin straight, well developed. Medial and lateral notogastral condyles triangular, rounded distally. Ten pairs of short (24–32), dilated in medial part, barbed notogastral setae present. Lyrifissures im and opisthonotal gland openings located postero-laterally to la.

Gnathosoma. Subcapitulum longer than wide (102–110 × 90). Subcapitular setae setiform, indistinctly serrate; m (36–41) longer than a and h (both 28–32). Adoral setae absent. Palps (73) with setation 0–2–1–3–8(+ω). Solenidion longer than half of palptarsus length, straight, thickened, pressed to the surface of palptarsus, distal part attached to distal seta. Chelicerae (123–135) each with one barbed seta cha (41–45); chb and their alveoli absent. Trägårdh’s organ distinct.

Epimeral and lateral podosomal regions. Apodemes (1, 2, sejugal, 3, 4) well visible. Anterior epimeral condyles triangular, posterior epimeral condyles elongate, rounded distally. Epimeral setal formula: 2–0–2–3. All setae setiform, thin, slightly barbed. Setae 1a, 2a, 3a and their alveoli absent. Setae 4a, 4b, 4c (16–20) shorter than others (28–36). Setae 3c inserted on pedotecta II; 4c inserted close to discidia. Discidia triangular, blunted.

Anogenital region. Four pairs of genital (8–10) and one pair of aggenital (6–8) setae setiform, smooth. Two pairs of anal (16–20) and three pairs of adanal (20–28) setae dilated in medial part, barbed. Adanal setae ad 3 located in paraanal position. Lyrifissures iad short, located in lateral position, antero-laterally to setae ad 3.

Legs. Monodactylous; claws 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]; homologies of setae and solenidia indicated in Table 7 . Leg setae u setiform (L-type) on all tarsi.

Type material. Collection data for holotype (female): locality 2 (litter); collection data for two paratypes (one female and one male): locality 2 (litter).

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 deposited in the collection of the Siberian Zoological Museum, Novosibirsk, Russia; one paratype is deposited in the collection of the Tyumen State University Museum of Zoology, Tyumen, Russia.

Etymology. The specific name is dedicated to our colleague, the soil zoologist, Dr. Bella R. Striganova (A.N. Severtsov Institute of Problems of Ecology and Evolution, Russian Academy of Sciences, Moscow, Russia).

Remarks. The genus Fissicepheus comprises 18 species and two subspecies, which are distributed in the Palaearctic and Oriental regions (data summarized by Subías 2004, updated 2014).

In combination of interlamellar and notogastral setae dilated in medial part, presence of 10 pairs of notogastral setae and all prodorsal and notogastral condyles, Fissicepheus striganovae sp. nov. is similar to Fissicepheus coronarius coronarius Aoki, 1967 from the Palaearctic region and Taiwan. However, it clearly differs from the latter by the costulae with rounded tip (versus with dentate expansion in F. coronarius coronarius ), ano-adanal setae dilated in medial part (versus simple in F. coronarius coronarius ) and striate genital plates (versus smooth in F. coronarius coronarius ).

Figures

FIGURE 22. Fissicepheus striganovae sp. nov., adult: A—dorsal view; B—ventral view (gnathosoma and legs except trochanters III, IV not illustrated); C—lateral view of prodorsum and anterior part of notogaster (gnathosoma and legs I, II not illustrated). Scale bar 100 Μm.

FIGURE 23. Fissicepheus striganovae sp. nov., adult: A—lamellar seta; B—interlamellar seta; C—bothridial seta; D—prodorsal and notogastral condyles; E—notogastral seta p 1; F—subcapitulum, left half, ventral view; G—palp; H—chelicera; I—pedotectum II, discidium, epimeral condyles and epimeral setae 3 c, 4 a; J—genital plate, left; K—anal plate, left, and adanal setae. Scale bar 20 Μm.

FIGURE 24. Fissicepheus striganovae sp. nov., adult: A—leg I, left, antiaxial view; B—leg IV, left, antiaxial view. Scale bar 50 Μm.