Diplobodes parakanekoi, Ermilov & Khaustov, 2020

Ermilov, Sergey G. & Khaustov, Alexander A., 2020, New Species Of The Genera Diplobodes And Machadocepheus (Acari, Oribatida, Carabodidae) From Thailand, With Remarks On Some Related Genera, Acta Zoologica Academiae Scientiarum Hungaricae 66 (1), pp. 1-15 : 2-6

Diplobodes parakanekoi sp. n.

( Figs 1A–C , 2A–D , 5A–C )

Diagnosis. Body size 581–630 × 282–332. Notogaster foveolate. Translamella present. Rostral setae thick, spinose. Lamellar and interlamellar setae setiform, roughened. Bothridial setae with slightly developed lanceolate head, heavily barbed. Notogaster with 12 or 13 (one pair of setae c present or absent) pairs of notogastral setae of medium size, setiform, roughened; da, dm, dp, la, lm and lp, h 1 (together) located on the six pairs of large tubercles. Five pairs of notogastral setae (p 1 – p 3, h 2 and h 3) in posterolateral position. Epimeral setation 3–1–3–3; 1a, 1c, 2a and 3a minute, 1b, 3b, 3c, 4a, 4b and 4b of medium size, setiform, roughened. Anogenital region with specific system of anogenital depressions. Anal setae short, spiniform, other anogenital setae of medium size, setiform, roughened.

Description. Measurements. Body length 630 (holotype: male), 581, 614 (two paratypes: males); notogaster width 332 (holotype), 282, 298 (two paratypes).

Integument ( Figs 1A–C , 2A–D ). Body color brown. Body covered by thick layer of gel-like cerotegument. Body surface (including subcapitular mentum and genae, genital and anal plates) microgranulate (diameter of tubercles less than 1). Notogaster, circummarginal region of ventral plate and antiaxial part of all leg femora and trochanters III, IV sparsely foveolate (diameter of foveoles up to 10). Projecting parts of lamellae foveate.

Prodorsum ( Figs 1A–C ). Rostrum broadly rounded. Lamellae long (slightly shorter than prodorsum), slightly divided mediodistally by transverse ridge into two parts, distally with triangular projection. Translamella broad. Tutoria long, strong, ridge-like, not reaching lateral margins of prodorsum. With depressions between lamellae, tutoria and pedotecta I ( Fig. 1C ). Region between lamellae slightly depressed. Interbothridial region with indistinct longitudinal wrinkles. Rostral setae (45–49) thick, with numerous spines. Lamellar and interlamellar setae similar in length (41–45), setiform, roughened; le located on lamellae, in located in interlamellar region. Bothridial setae (53–61) with slightly developed lanceolate head, heavily barbed, curved semiovally in mediodistal part. Bothridia interrupted ventrally, with small ventroposterior tooth. Exobothridial setae and their alveoli not observed.

Notogaster ( Figs 1A, 1C , 5A, 5C ). Narrow furrow between prodorsum and notogaster present. Anterior notogastral margin almost straight, posterior notogastral margin broadly rounded. Posterolateral part of notogaster with indistinct longitudinal wrinkles. Notogaster with six pairs of tubercles and 12 or 13 (one pair of setae c present or absent) pairs of notogastral setae (36–45) setiform, roughened; of these, da, dm, dp, la and lm located on five pairs of separated tubercles, lp and h 1 located on the sixth pair of tubercles, and setae p 1 – p 3, h 2 and h 3 in posterolateral position. Anterior part of notogaster with or without one pair of medial setae (c), humeral shoulders always without setae. Posterior notogastral and circumlateral depressions well developed. Lyrifissures ia not observed, other lyrifissures and opisthonotal gland openings well visible; im and gla close and lateral to lateral tubercles bearing setae la, ip between p 1 and p 2, ips and ih on lateral sides of notogaster.

Gnathosoma ( Figs 1B, 1C ). Typical for Carabodidae (ERMILOV & CORPUZ- RAROS 2016, ERMILOV & STARÝ 2018, Ermilov et al. 2019). Subcapitulum longer than wide (139–147 × 94–102). Subcapitular setae (a 16; m 16; h 14) setiform, similar in thickness, roughened. Postpalpal setae (8) spiniform. Palps (77–82) with setation 0–2–1–3–9(+ω). Solenidion of palptarsi long, bacilliform. Chelicerae (139–147) with two setiform, barbed setae, cha (41) longer than chb (16). Trägårdh’s organ of chelicerae elongate triangular.

Epimeral and lateral podosomal regions ( Figs 1B, 1C , 5B, 5C ). Epimeral setation 3–1– 3–3. Epimeral setae 1a, 1c, 2a and 3a minute (4), spiniform, 1b, 3b, 3c, 4a, 4b and 4b (32–36) setiform, roughened. Sternal region depressed. Pedotecta II rounded in ventral view. Discidia triangular, rounded distally. With one small depression behind acetabula IV and with one large elongate depression on lateral sides of body (between acetabula IV and notogastral margin).

Anogenital region ( Figs 1B, 1C , 5B ). With specific system of anogenital depressions ( Fig. 1B ): one large depression between genital and anal apertures, partially divided longitudinal median border; one pair of depressions close and lateral to genital aperture; one pair of depressions bearing aggenital setae; one pair of depressions bearing adanal setae ad 3; one pair of depressions lateral to the former and latter depressions. Usually with slightly visible, thin, diagonal furrows lateral to genital aperture. Four pairs of genital (20–28), one pair of aggenital (32–36) and three pairs of adanal (32–36) setae setiform, roughened. Two pairs of anal setae (12) spiniform. Adanal lyrifissures removed from anal aperture and located close to ad 3. Circumventral ridge visible.

Legs ( Figs 2A–D ). Claw of each leg strong, sparsely barbed dorsally and with one tooth ventrobasally. Porose area on all femora visible; porose area on trochanters not observed. Formulas of leg setation and solenidia: I (1–4–2–4–16) [1–2–2], II (1–4–2–3–15) [1–1–2], III (2–3–1–2–15) [1–1–0], IV (1–2–2–2–11) [0–1–0]; homology of setae and solenidia indicated in Table 1 . Famulus of tarsi I short, erect, blunt-ended, inserted posterior to solenidion ω 1. Solenidion Φ 1 on tibiae I very long, setiform; ω 1 and ω 2 on tarsi I, Φ 2 on tibiae I and σ on genua I, II of medium size, slightly thickened, blunt-ended; other solenidia short, bacilliform. Dorsoanterior apophysis of tibiae I (bearing Φ 1) developed.

Material examined. Holotype (male) and two paratypes (two males): southwest Thailand, Phuket Province, close to Karon Beach , 7°49’32.8”N 98°17’46.5”E, litter in forest vegetation, 4.04.2017 (A. A. Khaustov) .

Type deposition. The holotype is deposited in the collection of the Senckenberg Museum of Natural History, Görlitz, Germany. Two paratypes are deposited in the collection of the Tyumen State University Museum of Zoology, Tyumen, Russia. All in ethanol with a drop of glycerol.

Etymology. The species name parakanekoi refers to the similarity between the new species and Diplobodes kanekoi Aoki, 1958 .

Remarks. Diplobodes parakanekoi sp. n. differs from the other representatives of the genus Diplobodes by one important morphological trait: notogaster with 12 or 13 pairs of setae (without or with one pair of setae c) versus 14 or 15 pairs (with two or three pairs of setae c). However, the general morphology of the new species corresponds well to the generic diagnosis of Diplobodes ( ERMILOV et al. 2013) in other morphological traits therefore, we included this species into the genus Diplobodes .

Diplobodes parakanekoi sp. n. is morphologically most similar to Diplobodes kanekoi Aoki, 1958 from Japan and the Oriental region (see AOKI 1958, ERMILOV et al. 2013), D. africanus Mahunka, 1987 from Kenya (see MAHUNKA 1987, FERNANDEZ et al. 2019) and D. aokii Mahunka, 1989 from Kenya (see MAHUNKA 1989) in having several large notogastral tubercles bearing the notogastral setae and a foveolate notogaster. However, the new species differs from D. kanekoi by fewer notogastral setae of the c -row (one pair or without them versus two or three pairs), the absence of notogastral tubercles in position of setae c -row (versus one pair of tubercles present), setae c (if developed) inserted on notogastral surface (versus setae c 1 inserted on tubercles) and the localization of notogastral setae la and lm on separate tubercles (versus tubercles bearing la and lm connected). The new species differs from D. africanus and D. aokii by fewer notogastral setae of the c -row (one pair or without them versus two pairs), the presence of a translamella (versus absent), and the localization of notogastral setae lp and h 1 on one tubercle on either side (versus lp and h 1 inserted on separate tubercles).

Figures

Fig. 1. Diplobodes parakanekoi sp. n., adult:A = dorsal view, B = ventral view (legs not shown), C = lateral view (legs not shown). Scale bar: 100 µm

Fig. 2. Diplobodes parakanekoi sp. n., adult: A = leg I, without trochanter, right, antiaxial view, B = leg II, without trochanter and tarsus, left, antiaxial view, C = leg III, without tar- sus, left, antiaxial view, D = leg IV, left, antiaxial view. Scale bar: 20 µm

Fig. 5. Diplobodes parakanekoi sp. n. (A–C) and Machadocepheus pararachii sp. n. (D–F), adult, microscope images: A, D = dorsolateral view; B, E = ventral view; C, F = lateral view