Yoshiobodes (Dongnaiobodes) hexasetosus, Ermilov, Sergey G., Shtanchaeva, Umukusum Ya., Subías, Luis S. & Anichkin, Alexander E., 2014

Ermilov, Sergey G., Shtanchaeva, Umukusum Ya., Subías, Luis S. & Anichkin, Alexander E., 2014, A new subgenus and three new species of oribatid mites of the genus Yoshiobodes (Acari, Oribatida, Carabodidae) from Vietnam, Zootaxa 3795 (4), pp. 401-420 : 403-413

Description of Yoshiobodes (Dongnaiobodes) hexasetosus sp. nov.

( Figures 1–4 )

Diagnosis. Body size: 315–348 × 166–199. Surface of centrodorsal part of prodorsum smooth, surface of notogaster tuberculate. Lamellae and prodorsum with two pairs of transverse ridges, separated medially. Sensilli with short stalk and large clavate head. Six pairs of genital setae present.

Description. Measurements. Body length: 348 (holotype), 315–340 (two paratypes); notogaster width: 199 (holotype), 166–199 (two paratypes).

Integument. Body brown, covered by microgranular cerotegument (diameter of granules less than 1). Surface of anterior and lateral parts of prodorsum, lamellae, subcapitular mentum and genital plates with small foveolae (diameter up to 6). Centrodorsal surface of prodorsum smooth. Surface of notogaster tuberculate; tubercles (diameter up to 8) forming a polygonal ornamentation. Surface of ventral side, femora and trochanters III, IV with large foveolae (diameter up to 16), forming a reticulate ornamentation.

Prodorsum. Rostrum rounded (visible in dorso-frontal and frontal view). Lamellae and prodorsum with one pair of well developed transverse ridges (r), separated medially, located anteriorly to interlamellar setae. A pair of additional ridges located posteriorly to interlamellar setae. Translamella distinct. Rostral setae (ro, 18–20) setiform, thin, smooth. Lamellar setae (le, 28–32) thickened, densely barbed. Interlamellar setae (in, 16–20) phylliform, with small barbs. Sensilli (ss, 36–45) with short stalk and large clavate head, having strong spines unilaterally. Exobothridial setae and their alveoli absent. Tutoria (tu) long, with knife-like cusp comprising about one-fifth of fused portion of tutorium.

Notogaster. Prodorsum and notogaster separated by well developed furrow. Anterior notogastral margin straight. Humeral regions each with a indistinct concavity. Fifteen pairs of notogastral setae (c 3, la, h 1, p 1– p 3, 16–20; c 1, c 2, da, dm, lm, dp, lp, h 2, h 3, 24–32) phylliform, with small barbs. Lyrifissures (except ih, ip) and opisthonotal gland openings not visible under the cerotegumental layer.

Gnathosoma . Subcapitulum longer than wide (73–77 × 57–61). Subcapitular setae setiform, thin, smooth; a (8–10) longer than h and m (both 4–6). Adoral setae absent. Palps (41–45) with setation 0–2–1–3–8(+ω). Solenidion long, thickened, blunt-ended, not attached to eupathidium, pressed to surface of palptarsus. Chelicerae (77–82) with two barbed setae; cha (26–28) longer than chb (12). Trägårdh’s organ (Tg) distinct.

Epimeral and lateral podosomal regions. Epimeral setal formula 3–1–2–2. Epimeral setae short (4–6), thin, smooth. Pedotecta I (Pd I) large, scale-like (in lateral view); pedotecta II (Pd II) widely triangular, rounded distally. Discidia (dis) triangular, blunt distally.

Anogenital region. Six pairs of genital (g 1– g 6), one pair of aggenital (ag) and two pairs of anal (an 1, an 2) setae similar in length (4–6), thin, smooth. Three pairs of adanal setae (ad 1– ad 3, 12–16) phylliform, barbed. Lyrifissures iad not visible under the cerotegumental layer.

Legs. Claw of each leg smooth. Formulas 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 indicated in 1. Famulus (e) short, setiform. Setae u spine-like; other setae setiform (except phylliform l'' on genua I, II), many of which are weakly barbed. Solenidia φ on tibia IV dilated in median part; other solenidia thickened, blunt or setiform.

FIGURE 3. Yoshiobodes (Dongnaiobodes) hexasetosus sp. nov.: A—frontal view of rostrum; B—sensillus; C—tuberculate ornamentation in middle part of notogaster; D—notogastral seta dm; E—ventral view of left half of subcapitulum; F—palp; G—chelicera; H—right genital plate; I—left anal plate and adanal setae ad 2, ad 3. Scale bars (A) 50 Μm, (B–D, F) 10 Μm, (E, G–I) 20 Μm.

Roman letters refer to normal setae (e to famulus), Greek letters to solenidia. Single prime (') marks setae on anterior and double prime (") setae on posterior side of the given leg segment. Parentheses refer to a pair of setae.

Material examined. Holotype (female): southern Vietnam, Dong Nai Province, Dong Nai Biosphere Reserve, 11°25' N, 107°25' E, Lagerstroemia forest, nest of Black-and-red Broadbill ( Cymbirhynchus macrorhynchos ), 3.VII.2013, collected by Alexander E. Anichkin and Igor V. Palko. Two paratypes (both females): southern Vietnam, Lam Dong Province, Bi Dup – Nui Ba National Park, 12°11' N, 108°40' E, low-stemmed deciduous forest, soil, 6–7.XII.2013, collected by Alexander E. Anichkin and Sergey G. Ermilov.

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 hexasetosus refers to the presence of six setae on each genital plate.

Remarks. Yoshiobodes (Dongnaiobodes) hexasetosus sp. nov. differs from Yoshiobodes (D.) biconcavus sp. nov. by the presence of short, clavate sensilli and the absence of two large concavities in the humeral regions of the notogaster (versus sensilli long, elongate, narrowly spindle-form, concavities well developed).

Description of Yoshiobodes (Dongnaiobodes) biconcavus sp. nov. ( Figures 5–8 )

Diagnosis. Body size: 364–431 × 221–249. Centrodorsal area of prodorsum smooth, notogaster tuberculate. Lamellae and prodorsum with one pair of transverse ridges, separated medially. Sensilli narrowly spindle-form, with strong spines unilaterally. Humeral regions of notogaster with one large concavity each. Five or six pairs of genital setae present.

Description. Measurements. Body length: 431 (holotype), 364 (paratype); notogaster width: 249 (holotype), 221 (paratype).

Integument. Body black-brownish, covered by microgranular cerotegument (diameter of granules less than 1). Surface of anterior and lateral parts of prodorsum, subcapitular mentum and genital plates with small foveolae (diameter up to 8). Centrodorsal surface of prodorsum smooth. Surface of notogaster tuberculate; tubercles (diameter up to 8) forming a polygonal ornamentation. Surface of ventral side and femora and trochanters III, IV with large foveolae (diameter up to 10).

Prodorsum. Rostrum rounded (visible in dorso-frontal and frontal view). Lamellae and prodorsum with one pair of well developed transverse ridges, separated medially, located anteriorly to interlamellar setae. Translamella weakly developed. Rostral setae (16–18) setiform, thin, smooth. Lamellar setae (36–45) thickened, densely barbed. Interlamellar setae (in, 16–20) phylliform, with small barbs. Sensilli (82–94) longest setae on prodorsum, narrowly spindle-form, with strong spines unilaterally. Exobothridial setae and their alveoli absent. Tutoria long, with knifelike cusp comprising about one-fifth of fused portion of tutorium.

Notogaster. Prodorsum and notogaster separated by well developed furrow. Anterior notogastral margin straight. Humeral regions each with one large concavity (con). Fifteen pairs of notogastral setae (16–24) phylliform, with small barbs. Lyrifissures and opisthonotal gland openings not visible under the cerotegumental layer.

FIGURE 7. Yoshiobodes (Dongnaiobodes) biconcavus sp. nov.: A—dorsofrontal view of rostrum; B—sensillus; C—tuberculate ornamentation in middle part of notogaster; D—notogastral seta lm; E—ventral view of right half of subcapitulum; F—palp; G—chelicera; H—right genital plate; I—right anal plate and adanal setae ad 2, ad 3. Scale bars (A) 50 Μm, (B, C, E, G–I) 20 Μm, (D, F) 10 Μm.

Gnathosoma . Subcapitulum longer than wide (90 × 69). Subcapitular setae setiform, thin, smooth; a (12) longer than h and m (both 6). Adoral setae absent. Palps (53) with setation 0–2–1–3–8(+ω). Solenidion long, thickened, blunt-ended, not attached to eupathidium, pressed to surface of palptarsus. Chelicerae (90) with two barbed setae; cha (32) longer than chb (16). Trägårdh’s organ distinct.

Epimeral and lateral podosomal regions. Epimeral setal formula 3–1–3–3. Epimeral setae short (6), thin, smooth. Pedotecta I large, scale-like (in lateral view); pedotecta II widely triangular, rounded distally. Discidia triangular, blunt distally.

Anogenital region. Five pairs of genital (six setae on right plate in holotype), one pair of aggenital and two pairs of anal (an 1, an 2) setae similar in length (6), thin, smooth. Three pairs of adanal setae (10) phylliform, barbed. Lyrifissures iad not visible under the cerotegumental layer.

Legs. Morphology and setation ( Table 1 ) similar to Yoshiobodes hexasetosus sp. nov., but solenidia φ on tibia IV thickened (not dilated in median part).

Material examined. Holotype and paratype (both males): southern Vietnam, Dong Nai Province, Dong Nai Culture and Nature Reserve, 11°18' N, 107°04' E, Dipterocarp forest, soil, 20.XII.2013, collected by Alexander E. Anichkin and Sergey G. Ermilov.

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

Etymology. The specific name biconcavus refers to the presence of two large concavities in the humeral regions of the notogaster.

Remarks. See Remarks section after description of Yoshiobodes (Dongnaiobodes) hexasetosus sp. nov.

Figures

FIGURE 1. Yoshiobodes (Dongnaiobodes) hexasetosus sp. nov.: A—dorsal view of body; B—lateral view of prodorsum and anterior part of notogaster (legs not illustrated); C—lateral view of posterior part of notogaster. Scale bar 100 Μm.

FIGURE 2. Yoshiobodes (Dongnaiobodes) hexasetosus sp. nov.: A—ventral view of body; B—posterior view of notogaster. Scale bar 100 Μm.

FIGURE 4. Yoshiobodes (Dongnaiobodes) hexasetosus sp. nov.: A—leg I, without trochanter, right, antiaxial view; B—leg IV, right, antiaxial view. Scale bar 20 Μm.

FIGURE 5. Yoshiobodes (Dongnaiobodes) biconcavus sp. nov.: A—dorsal view of body; B—lateral view of prodorsum and anterior part of notogaster (legs not illustrated); C—lateral view of posterior part of notogaster. Scale bar 100 Μm.

FIGURE 6. Yoshiobodes (Dongnaiobodes) biconcavus sp. nov.: A—ventral view of body; B—posterior view of notogaster. Scale bar 100 Μm.

FIGURE 8. Yoshiobodes (Dongnaiobodes) biconcavus sp. nov.: A—leg II, without trochanter, right, antiaxial view; B—leg IV, right, antiaxial view. Scale bar 20 Μm.

Tables

TABLE 1. Leg setation and solenidia of Yoshiobodes (Dongnaiobodes) hexasetosus sp. nov. (same data for Yoshiobodes (D.) biconcavus sp. nov. and Y. (Yoshiobodes) neotrichorostralis sp. nov.)

Leg	Trochanter	Femur	Genu	Tibia	Tarsus
I	v'	d, (l), bv''	(l), v', σ	(l), (v), φ1, φ2	(ft), (tc), (it), (p), (u), (a), s, (pv), e, ω1, ω2
II	v'	d, (l), bv''	(l), v', σ	l', (v), φ	(ft), (tc), (it), (p), (u), (a), s, (pv), ω1, ω2
III	l', v'	d, l', ev'	l', σ	(v), φ	(ft), (tc), (it), (p), (u), (a), s, (pv)
IV	v'	d, ev'	d, l'	(v), φ	ft'', (tc), (p), (u), (a), s, (pv)