Protoribates cattienensis, Ermilov & Anichkin, 2011

Ermilov, S. G. & Anichkin, A. E., 2011, THREE NEW SPECIES OF HAPLOZETIDAE (ACARI: ORIBATIDA) FROM VIETNAM Sergey G. E and Alexander E. A, Acarologia 51 (1), pp. 43-59 : 49-53

Protoribates cattienensis n. sp.

( Figures 4 – 6 )

With characters of Protoribates as summarized by Weigmann et al. (1993). The diagnostic characters of the genus Protoribates are: sensilli setiform or with a dilated head; notogaster with 10 or 11 pairs of short notogastral setae or vestigial; four pairs of areae porosae; lamellae well-developed, but mostly narrow, no true translamella and prolamellae are present; sublamellae present; tutorium present; dorsosejugal suture complete; pteromorphae movable; discidia well-developed; five pairs of genital setae, one pair of aggenital setae.

Diagnosis

Protoribates cattienensis n. sp. is distinguished by the following combination of character states. Body size 315 – 348 x 140 – 166; surface of body punctate (visible under high magnification); rostrum rounded or slightly truncate; rostral setae setiform, smooth; lamellar setae short, thin, smooth; interlamellar setae setiform, thicker and slightly longer than rostral setae, barbed; sensilli setiform, thickened, with cilia on outer margin; dorsosejugal suture convex; ten pairs of short, setiform, straight, smooth notogastral setae, three pairs of small areae porosae present; epimeral and anogenital setae setiform, smooth (except anteriormost pair of genital setae barbed).

Description

Measurements — Body length 348 (holotype), 315 – 348 (mean 333, 10 paratypes); body width 149 (holotype), 140 – 166 (mean 149, 10 paratypes). Males and females similar in size.

Integument — Body color light brown to brown. Surface punctate (visible under high magnification).

Prodorsum — ( Figure 4A ; Figure 5A–E ). Rostrum rounded or slightly truncate. Lamellae located dorsolaterally, slightly longer than half of prodorsum. Rostral setae 20 – 24, setiform, smooth, located on tubercles. Lamellar setae short (6 – 8), setiform, thin, smooth, inserted medially from lamellar tips. Interlamellar setae thicker and slightly longer than rostral setae, 28 – 32, setiform, barbed. Exobothridial setae minute (1 – 2). Sensilli (57 – 65) setiform, thickened, with 21 – 25 cilia on outer margin. Prodorsum laterally with short tutorium. Sublamellar lines well-developed. Sublamellar areae porosae absent. Raised line between rostral setae and acetabulum I present (visible in lateral view). Pedotecta I and II small.

Notogaster — ( Figure 4A ). Dorsosejugal suture convex. Pteromorphae short, movable. Ten pairs of short (6 – 8), setiform, straight, smooth notogastral setae. Three pairs of small circular areae porosae: Aa 6, A1 4, A2 4. Areae porosae A3 absent. Opisthonotal gland opening and lyrifissures ia, im, ip, ih, ips developed in typical arrangement for genus. Discidia triangular.

Anogenital region — ( Figure 4B ; Figure 5F–H ). Two pairs anal (8), three pairs adanal (ad 1, ad 2 8, ad 3 6 – 8) and one pair aggenital (4) setae setiform, smooth. Five pairs of genital setae: g 1 (8 – 10) setiform, barbed, others shorter and smooth (4 – 6). Lyrifissures iad in typical position for genus. Ovipositor elongate, narrow (102 – 110 x 16); length of lobes 49 – 53, length of cylindrical distal part 53 – 57. Lobes with 12 pairs thin, smooth setae: ψ 1 ≈ τ 1 (16) longer than ψ 2 ≈ τa ≈ τb ≈ τc (8 – 10). Coronal setae k absent.

Epimeral region — ( Figure 4B ). Apodemes 1, 2, sejugal, 3 and circumpedal carina well-developed. Epimeral setal formula 3-1-3-3. All setae differ little in length, short (4 – 6), setiform, thin, smooth. Setae 3c and 4c visible only in lateral view.

Gnathosoma — ( Figure 5I–K ). Subcapitulum longer than wide: 86 – 94 x 57 – 65. Hypostomal setae setiform, a and h slightly barbed, m smooth; a (16) longer than h (8 – 12) and m (4). Lateral lips with two pairs of adoral setae (12), setiform, straight, with dense cilia. Palps (length 49 – 57) with setation 0-2-1-3-9(+1ω). All setae (except some on tarsi) with cilia (ventral seta on femora and tibiae) or barbs (others). Chelicerae (length 94 – 98) chelate-dentate;

Ermilov S. G. and Anichkin A. E.

cheliceral setae setiform, barbed, cha (32 – 36) longer than chb (12 – 16).

Legs — ( Figure 6 ). All legs with one simple claw. Formulae of leg setation and solenidia: I (1- 5-3-4-20) [1-2-2], II (1-5-3-4-15) [1-1-2], III (2-2-1-3- 15) [1-1-0], IV (1-2-1-3-12) [0-1-0]; homology of setae and solenidia indicated in Table 2. Setae setiform, barbed (except p), some ventral setae of tarsi and tibiae with long spines. Famulus short, straight, blunt-ended. Solenidia ω 1 on tarsi I, ω 1 and ω 2 on tarsi II, σ on genua III thickened, rod-shaped; other solenidia setiform.

Material examined — Holotype (male), paratypes (10 specimens: four males and six females) were obtained from Cat Tien National Park , in southern Vietnam, 11°25’ N, 107°25’ E, 149 m above sea level, in dark loamy soil of Lagerstroemia forest, February-March 2009, collected by A.E. Anichkin.

Type deposition — The holotype is deposited in the collection of the Zoological Institute of the Russian Academy of Sciences, St. Petersburg, Russia ; all paratypes are deposited in the collection of the Siberian Zoological Museum , Novosibirsk, Russia .

Etymology — The specific name " cattienensis " refers to Cat Tien National Park.

Distribution — At present, this species is only

Ermilov S. G. and Anichkin A. E.

known from Cat Tien National Park, in southern Vietnam.

Remarks — Protoribates cattienensis n. sp. is similar to the following species in having short lamellar setae and monodactylous legs: P. brevisetosus ( Fujita, 1989) from Japan, P. capucinus Berlese, 1908 with cosmopolitan distribution, P. geonjiensis Choi, 1994 from Korea, P. paracapucinus (Mahunka, 1988) from Oriental region. It differs from these species by the setiform sensilli (with well-developed head in the other species).

The new species differs from: P. brevisetosus by the smooth epimeral setae 1c (barbed in P. brevisetosus ); from P. capucinus by the rostral setae being considerably longer than lamellar setae (little difference in length in P. capucinus ); from P. geonjiensis by the smaller body (315 – 348 vs. 404 – 430 in P. geonjiensis ); and from P. paracapucinus by the shorter interlamellar setae (longer in P. paracapucinus ).

Weigmann and Monson (2004) consider that the insertion of lamellar setae is among the diagnostic characters distinguishing between Protoribates and Octodurozetes Mahunka, 1993 (inserted on tips of lamellae in Protoribates ; inserted medial to lamellar tips in Octodurozetes ). Protoribates cattienensis n. sp. has these setae inserted medial to the lamellar tips, therefore in this character it is similar to O. berndhauseri Mahunka, 1993 from Switzerland, which is the only known species of Octodurozetes . In our opinion, this character does not distinguish the genera, because several species of Protoribates (for example, P. bayanicus Bayartogtokh, 2000 from Mongolia, P. brevisetosus , P. geonjiensis , P. kumayaensis Nakamura, Fukumori and Fujikawa, 2010 from Japan, P. nagaroensis ( Fujita, 1989) from Japan, P. paracapucinus and some others) have lamellar setae inserted medial to the lamellar tips. Octodurozetes can be clearly distinguished from Protoribates only by the presence of prolamellae (absent in Protoribates ).

Figures

FIGURE 4: Protoribates cattienensis n. sp. A – dorsal view, legs palps and setae of subcapitulum not shown; B – ventral view, legs not shown. Scale bar (A + B) 100 µm.

FIGURE 5: Protoribates cattienensis n. sp. A – lateral view of prodorsum, legs, gnathosoma and epimeral setae not shown; B – rostral setae; C – lamellar seta; D – interlamellar seta; E – sensillus; F – genital plate, left; G – anal plate, left; H – ovipositor; I – subcapitulum; J – palp; K – chelicera. Scale bars (A, H, I, K) 50 µm, scale bars (E – G, J) 20 µm, scale bar (B + C + D) 10 µm.

FIGURE 6: Protoribates cattienensis n. sp. A – leg I, right, paraxial view; B – leg II, right, without trochanter, paraxial view; C – leg III, right, without trochanter, paraxial view; D – leg IV, right, paraxial view. Scale bar (A + B + C + D) 20 µm.