Haplozetes bayartogtokhi, Ermilov & Sandmann & Scheu, 2019

Ermilov, Sergey G., Sandmann, Dorothee & Scheu, Stefan, 2019, New and interesting species of sacculonotic Haplozetidae (Acari, Oribatida, Haplozetidae) from Indonesia, Zootaxa 4656 (3), pp. 459-474 : 460-464

Haplozetes bayartogtokhi sp. nov.

( Figs 1–3 )

Material examined. Holotype (male) and five paratypes (two females and three males) : Indonesia, Sumatra, Bukit Duabelas landscape, secondary tropical rainforest, research site BF1a, 01°59’42.5’’S, 102°45’08.1’’E, litter, November 2013 (B. Klarner).

Type deposition. The holotype is deposited in the collection of LIPI (Indonesian Institute of Science) Cibinong, Indonesia; five paratypes are deposited in the collection of the Tyumen State University Museum of Zoology, Tyumen, Russia. All in ethanol with a drop of glycerol.

Diagnosis. Body size: 232–249 × 132–166. Anterior part of notogaster foveolate and with transverse row of semi-oval depressions. Rostrum rounded. Prolamellae present, reaching the rostrum. Rostral and lamellar setae of medium size, setiform, barbed. Interlamellar setae minute. Bothridial setae long, spindle-form, barbed. Notogastral, epimeral, genital and anogenital anal setae minute. Four pairs of sacculi with slightly elongated channels. Circumpedal carinae directed to pedotecta II. Five pairs of genital setae. Adanal lyrifissures in preanal position. Leg tarsi with two claws.

Description. Measurements. Body length: 232 (holotype: male), 232–249 (five paratypes: two female and three males); notogaster width: 149 (holotype), 132–166 (five paratypes). Females larger than males: 249 × 166 versus 232 × 132–149.

Integument ( Fig. 1A ). Body color light brown. Body surface (including subcapitular mentum and genae, genital and anal plates, legs) punctate (visible under high magnification, × 1000). Lateral parts of prodorsum between bothridia and acetabula I, II slightly microgranulate. Anterior part of notogaster with transverse row of semi-oval depressions. Region between anterior margin of notogaster and row depressions foveolate (diameter of foveoles up to 4).

Prodorsum ( Figs 1A, 1C ). Rostrum rounded. Lamellae well-developed, located dorsolaterally, longer than half of prodorsum (measured in lateral view). Sublamellae short, poorly visible. Sublamellar porose areas oval (6–8 × 4). Prolamellae thin, reaching the rostrum. Tutoria of medium size, ridge-like. Lateral carinae of prodorsum straight, located close to prodorsal margins. Rostral (20–24) and lamellar (20–24) setae setiform, barbed; ro inserted on lateral sides of rostrum and removed from tutorial ends, le on the lamellar ends. Interlamellar (2–4) and exobothridial (2–4) setae setiform, thin, smooth. Bothridial setae (61–65) spindle-form, barbed, with long stalk and short head. Dorsosejugal porose areas poorly visible, oval (6 × 2), located posterior to interlamellar setae. Dorsophragmata distinctly elongate.

Notogaster ( Figs 1 A–1C, 2B). Anterior notogastral margin convex medially. Ten pairs of notogastral setae, short (2–4), setiform, thin, smooth. Four pairs of sacculi with small openings and slightly elongated channels. Distance S1–S1 approximately equal to S2–S2. All lyrifissures and opisthonotal gland openings distinct. Circumgastric scissure and circumgastric sigillar band well visible.

Gnathosoma ( Figs 2 C–2E). Subcapitulum longer than wide (51–53 × 41–43). Subcapitular setae (a, 10–12; m, 14–16; h, 10–12) setiform, similar in thickness, roughened. Adoral setae (6) setiform, heavily barbed. Palps (length 34–36) with setation 0-2-1-3-9(+ω). Solenidion and seta acm of tarsi connected, straight. Postpalpal setae (4) spiniform, smooth. Chelicerae (length 55–57) with two setiform, barbed setae (cha, 18–20; chb, 12). Trägårdh’s organ of chelicerae elongate triangular.

Epimeral and lateral podosomal regions ( Figs 1C , 2A ). Epimeral setal formula: 3-1-3-3. Epimeral setae (3c, 8; 4c, 6; others 4) setiform, thin, smooth. Pedotecta II rounded in ventral view. Discidia roundly triangular. Humeral porose areas (Am, Ah) not observed. Circumpedal carinae long, directed to pedotecta II.

Anogenital region ( Figs 1B, 1C , 2A, 2B ). Five pairs of genital (g 1, 6–8; others 4), one pair of aggenital (4), two pairs of anal (4) and three pairs of adanal (4) setae setiform, thin, smooth. Adanal lyrifissures located close and anterior to anal aperture. Adanal setae ad 1 posterior, ad 2 posterolateral, ad 3 anterior to anal aperture. Marginal porose area long, band-like. Preanal organ goblet-like.

Legs ( Figs 3 A–3D). All legs bidactylous. One claw thick, the other claw (paraxial on tarsi I, II, antiaxial on tarsi III, IV) thin, with small tooth ventrodistally; both barbed on dorsal side. Femora I-IV and trochanters III, IV with distinctly developed dorsoparaxial porose area. Ventroproximal porose area on tarsi and ventrodistal porose area on tibiae not observed. Tibiae I, II with slightly developed ventroproximal tubercle. Tibiae II with dorsodistal tooth. Formulas of leg setation and solenidia: I (1-5-3-4-19) [1-2-2], II (1-5-3-4-15) [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 tarsi I located posterior to solenidion ω 2. Solenidion φ 2 of tibiae I located on small dorsodistal apophysis. Seta pl’ located dorsally on tarsi I, posterior to seta ft”.

Etymology. The species name is dedicated to our colleague, the well-known acarologist Prof. Dr. Badamdorj Bayartogtokh (National University of Mongolia, Ulaanbaatar, Mongolia), for his extensive contributions to our knowledge of oribatid mites.

Remarks. Haplozetes bayartogtokhi sp. nov. is morphologically most similar to Haplozetes biheterodactylus Ermilov & Tolstikov, 2015 from Brazil in having small body size, bidactylous legs and spindle-form bothridial setae, but differs from the latter by the presence of minute interlamellar setae (versus long), foveolate anterior part of notogaster (versus not foveolate) and five pairs of genital setae (versus four pairs) and the localization of adanal lyrifissures in preanal position (versus paraanal position).

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

*—seta v’ on genua II and seta l’ on trochanters III absent in M. leonilae sp. nov. (versus present in H. bayartogtokhi sp. nov. and I. hauseri ).

Figures

FIGURE 1. Haplozetes bayartogtokhi sp. nov., adult:A—dorsal view (legs not shown); B—posterior part of body, lateral view; C—anterior part of body, lateral view (gnathosoma and legs not shown). Scale bar 50 μm.

FIGURE 2. Haplozetes bayartogtokhi sp. nov., adult: A—ventral view (gnathosoma and legs not shown); B—posterior view; C—subcapitulum, ventral view; D—palp, right, antiaxial view; E—chelicera, left, paraxial view. Scale bar 50 μm (A, B), 20 μm (C, E), 10 μm (D).

FIGURES 3. Haplozetes bayartogtokhi sp. nov., adult: A—leg I, without trochanter, left, paraxial view; B—femur, genu and tibia of leg II, right, antiaxial view; C—trochanter, femur and genu of leg III, left, antiaxial view; D—leg IV, left, antiaxial view. Scale bar 20 μm.

Tables

TABLE 1. Leg setation and solenidia of adult Haplozetes bayartogtokhi sp. nov., Magyaria leonilae sp. nov. and Indoribates hauseri (Mahunka, 1997)

Leg	Tr		Fe	Ge	Ti		Ta
I	v’	d,	(l), bv”, v”	(l), v’, σ	(l), (v), φ1, φ2	(ft), (tc), (it), ɛ, ω1, ω2	(p), (u), (a),	s, (pv),	(pl), v’,
II	v’	d,	(l), bv”, v”	(l), v’*, σ	(l), (v), φ	(ft), (tc), (it),	(p), (u), (a),	s, (pv),	ω1, ω2
III	l’*, v’	d,	l’, ev’	l’, σ	l’, (v), φ	(ft), (tc), (it),	(p), (u), (a),	s, (pv)
IV	v’	d,	ev’	d, l’	l’, (v), φ	ft”, (tc), (p), (u), (a), s, (pv)