Lineoppia microseta, Ermilov & Anichkin, 2011

Ermilov, S. G. & Anichkin, A. E., 2011, New Oribatid Mites Of The Genera Pulchroppia And Lineoppia (Acari: Oribatida: Oppiidae) From Cat Tien National Park In Southern Vietnam, Acarologia 51 (1), pp. 31-42 : 36-41

Lineoppia microseta n. sp.

( Figures 4 – 6 )

Diagnosis

The new species is characterized by the size of body, 180 – 200 x 90 – 98; surface of anogenital

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

region and epimeres 3+4 with long longitudinal striae; costular lines short and thin; interlamellar setae minute; apodemes 4 fused posterior to genital plates, straight; lyrifissures iad located in direct apoanal position; tibiae of leg II with anterio-ventral projection, having fusiform seta v”.

Description

Measurements — Body length 180 (holotype), 196 – 200 (mean 198, two paratypes); body width 90 (holotype), 94 – 98 (mean 96, two paratypes).

Female slightly larger than males: body length of female (paratype) 200, body width 98; body length of males (holotype and one paratype) 180 – 196 (mean 188), body width 90 – 94 (mean 92).

Integument — Body color light brown. Surfaces of prodorsum and notogaster smooth; surface of anogenital region and epimeres 3+4 with welldeveloped long longitudinal striae. Epimeral region with muscle sigillae.

Prodorsum — ( Figure 4A, C ; Figure 5A ). Rostrum rounded. Costular lines short and thin. Lateral striae long. Interbothridial region with one pair of small median tubercles and two pairs of muscle sigilla. Postbothridial region with one pair of tubercles directed towards dorsosejugal suture. Rostral setae 10 – 14, setiform, slightly barbed (barbs visible only under high magnification). Lamellar and exobothridial setae (both 8) setiform, smooth. Interlamellar setae minute (1 – 2). Sensillus 53 – 61, setiform, thickened, curved, with barbs unilaterally.

Notogaster and lateral part of body — ( Figure 4A, C ). Slightly convex anteriorly. Anterior margin with one pair of robust humeral tubercles directed to postbothridial tubercles. Ten pairs of notogastral setae similar in length (8 – 12), setiform, thin, smooth. Setae c, p 1 and p 2 little shorter than others. Lyrifissures (ia, im, ip, ih, ips) well-developed, elongate. Opisthosomal gland opening indistinct. Discidia elongate.

Anogenital region — ( Figure 4B ; Figure 5B, C ). All apodemes well-developed. Apodemes 4 fused posterior to genital plates, straight. Two pairs anal, three pairs adanal, one pair aggenital and five pairs genital setae similar in length (4 – 6), setiform, smooth. Lyrifissures iad conspicuously long, located in direct apoanal position. Ovipositor ( Figure 5D ) elongate, narrow (77 x 12); length of lobes 28, length of cylindrical distal part 49. Lobes with 12 pairs thin, smooth setae; ψ 1 ≈ τ 1 (18) longer than ψ 2 ≈ τa ≈ τb ≈ τc (12). Setae k absent.

Epimeral region — ( Figure 4B ).Setae similar in length (8-12), setiform, thin, smooth. Setae 3c set on small apophyses laterally.

Gnathosoma — ( Figure 5E–G ). Subcapitulum longer than wide: 45 x 36. Hypostomal setae similar in length (8 – 10), setiform, smooth. Adoral setae absent. Palps (length 32) with setation 0-2-1-3- 9(+1ω). All setae (except on tarsi) slightly barbed. Palptarsal solenidion long. Chelicerae (length 49) chelate-dentate. Cheliceral setae setiform, barbed, cha (12 – 14) longer than chb (8).

Legs — ( Figure 6 ). All legs with one simple claw each. Formulae of leg setation and solenidia: I (1- 5-2-4-20) [1-2-2], II (1-5-2-4-13) [1-1-2], III (2-3-1-3- 13) [1-1-0], IV (1-2-2-3-10) [0-1-0]; homology of setae and solenidia indicated in Table 2. Many setae slightly barbed. Tibiae II with anterio-ventral projection, having fusiform seta v”. Setae p on tarsi II – IV absent. Famulus minute. Solenidia ω 2 on tarsi I and φ 1 on tibiae I setiform; others solenidia thickened, blunt-ended. Solenidia of genua pressed to segments, curved.

Material examined — Holotype (male) and two paratypes (male and female) were obtained from 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 ; one paratype is deposited in the collection of Siberian Zoological Museum , Novosibirsk, Russia ; one paratype is in the personal collection of the first author.

Etymology — The name " microseta " refers to the very short interlamellar setae.

Distribution — At present, this species is only known from Cat Tien National Park of southern Vietnam.

Remarks — Lineoppia microseta n. sp. is similar in having a lineate anogenital region to Lineoppia frouini Balogh and Balogh, 1983 from New Caledonia. The anogenital region is not lineate in the other known species of the genus Lineoppia mastax ( Balogh and Mahunka, 1977) from Neotropical region and Lineoppia tuberosa ( Mahunka, 2009) from Madagascar). The new species differs from Lineoppia frouini by the smaller body length (180- 200 in new species; 287 in Lineoppia frouini ), very short costular lines (costular lines longer in Lineoppia frouini ), the morphology of interlamellar setae (minute in the new species; absent, only alveoli present, in Lineoppia frouini ), absence of integumental lines on notogaster (lines well-developed in Lineoppia frouini ), position of notogastral setae la and lm (on one horizontal line in new species; la considerably anterior to lm in Lineoppia frouini ), position of lyrifissures iad (direct apoanal in new species; inverse apoanal in Lineoppia frouini ), position of apodemes 4 (straight in new species; inclined in Lineoppia frouini ).

Figures

FIGURE 4: Lineoppia microseta n. sp. A – dorsal view, legs removed; B – ventral view, legs partly removed, gnathosoma removed; C – lateral view, legs gnathosoma and epimeral setae removed. Scale bars (A + B, C) 50 µm.

FIGURE 5: Lineoppia microseta n. sp. A – sensillus; B – genital plate, left; C – anal plate, left and adanal setae; D – ovipositor; E – subcapitulum; F – palp; G – chelicera. Scale bars (A – E, G) 20 µm, scale bar (F) 10 µm.

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