Lyroppia dongnaiensis, Ermilov & Anichkin, 2013

Ermilov, S. G. & Anichkin, A. E., 2013, Oribatid Mites (Acari, Oribatida) From Dipterocarp And Polydominant Forests Of The Dong Nai Culture And Nature Reserve (Southern Vietnam), With Description Of A New Species Of Lyroppia (Oppiidae), Acarologia 53 (1), pp. 101-109 : 104-108

Lyroppia dongnaiensis n. sp.

( Figures 1-3 )

Diagnosis — Body size 192 – 205 x 90 – 94. Rostral setae inserted laterally on prodorsum. Lamellar, interlamellar and exobothridial setae minute. Sensilli with long stalk and oblong, dilated, smooth head. Notogastral cristae ending between the insertions of notogastral setae la and lm. Lenticulus present, circular. Distance between notogastral setae c and la twice the length of distance between notogastral setae la and lm. Aggenital setae inserted laterally to genital plates. Lyrifissures iad shorter than half length of anal plates.

Measurements — Body length 192 (holotype), 205 (two paratypes); notogaster width 90 (holotype), 94 (two paratypes).

Integument — Body color light brown. Body surface smooth; leg trochanter and femora III and IV with stria.

Prodorsum — ( Figures 1A , C-E). Rostrum rounded in dorsal view. Costulae near half length of prodorsum, slightly converging. Translamella absent. Rostral setae (ro, 8-10) setiform, smooth, inserted laterally. Lamellar (le) and interlamellar (in) setae short (4), setiform, thin, smooth. Sensilli (ss, 49-53) with long stalk and oblong, dilated head. Sensillar head slightly pointed or rounded distally, smooth or with several indistinct barbs on dorsal side.

Notogaster — ( Figure 1A ). Anterior margin medially convex, with two divergent, sclerotized apophyses running to basal part of prodorsum. Notogastral cristae long, ended between the insertions of notogastral setae la and lm. Lenticulus (len) present, circular (diameter 28 – 32). Notogastral setae short (4 – 6), thin, smooth. Centrodorsal setae (c, la, lm, lp, h 1, h 2) inserted in one row. Distance between notogastral setae c and la twice length of distance between notogastral setae la and lm. Setae h 3, p 1 - p 3 inserted in postero-marginal position. Lyrifissures ia, im, ip and opisthonotal gland openings not evident.

Lateral part of body — ( Figures 1A, E ). Pedotecta I (Pt I) convex. Exobothridial setae (ex, 4) setiform, thin, smooth. Lyrifissures ih, ips not evident. Discidia (dis) rounded distally.

Gnathosoma — ( Figures 2 A-C). Subcapitulum longer than wide (45 – 49 x 32 – 36). Subcapitular setae setiform, slightly barbed; h and m (12 – 16) little longer than a (10 – 12). Adoral setae absent. Palps (28) with setation 0-2-1-3-8(+1ω). Solenidion not attached with eupathidium, pressed to the palptarsus surface. Chelicerae (49) with two barbed setae; cha (16 – 18) longer, than chb (10). Trägårdh’s organ (Tg) distinct.

Epimeral region — ( Figure 1B ). Epimeral border IV transverse, straight. Epimeral setal formula: 3-1- 3-3. Epimeral setae short (1c, 8; others, 4 – 6), setiform, thin, smooth.

Anogenital region — ( Figures 1B , 2D,E ). Six pairs of genital, one pair of aggenital (ag), two pairs of anal (an 1, an 2) and three pairs of adanal (ad 1 - ad 3) setae short, similar in length (4), setiform, thin, smooth. Aggenital setae inserted laterally to genital plates. Lyrifissures iad paraanal, shorter than half length of anal plates.

Legs — ( Figures 3A, B ). Tarsi with one claw, having a poorly visible barb on ventral side. Femora and trochanters III, IV with ventral ridge. Homology of setae and solenidia indicated in Table 1. Famulus setiform. Solenidia weakly thickened, bluntended.

Material examined — Holotype (male) and two paratypes (male and female) from Dip-1.

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 in the collection of the Siberian Zoological Museum , Novosibirsk, Russia ; one paratype is in the personal collection of the first author.

Etymology — The new species is named after Dong Nai Culture and Nature Reserve (Southern Vietnam), where the material was collected.

Remarks — Lyroppia dongnaiensis n. sp. can be distinguished from all known species of the genus Lyroppia by the key which is presented below.

Figures

FIGURE 1: Lyroppia dongnaiensis n. sp.: A – dorsal view; B – ventral view, legs, palps and subcapitular setae not shown; C – lateral view of rostrum and rostral seta; D – sensillus; E – exobothridial seta and medio-posterior part of bothridium (bo). Scale bar (A+B) 50 µm, scale bar (C+D+E) 10 µm.

FIGURE 2: Lyroppia dongnaiensis n. sp.: A – subcapitulum, left half; B – palp; C – chelicera; D – genital plate, left, and aggenital seta; E – anal plate, left, and adanal setae. Scale bar 10 µm.

FIGURE 3: Lyroppia dongnaiensis n. sp.: A – leg I, without trochanter, left, antiaxial view; B – leg IV, without trochanter, right, paraxial view. Scale bar 20 µm.