Achipteria coleoptrata ( Linnaeus, 1758 )

Bayartogtokh, B. & Ryabinin, N. A., 2012, The Soil Mite Family Achipteriidae (Acari: Oribatida) In Mongolia And The Russian Far East, Acarologia 52 (2), pp. 135-156 : 136-140

Achipteria coleoptrata ( Linnaeus, 1758)

( Figs. 1 and 2 )

Acarus coleoptratus: Linnaeus, 1758: 616 .

Oribata ovalis: Nicolet, 1855: 438 , pl. 4, fig. 5.

Oribates nicoletii: Berlese, 1883 : fasc. 3(3).

Oribata intermedia: Michael, 1898: 21 .

Oribates redux: Hull, 1914: 219 .

Notaspis coleoptratus: Oudemans, 1914: 37 , pl. 17, figs. 11-15; 1927: 124; Sellnick, 1928: 7, fig. 7; 1931: 699, figs. 4, 5; Willmann, 1931: 183, figs. 322-324; Balogh, 1943: 97, taf. 17, fig. 10.

Achipteria coleoptrata: van der Hammen, 1952: 112 , fig. 11d, g, i; Hammer, 1952: 64, fig. 102; Schweizer, 1956: 336, abb. 300; Bulanova-Zachvatkina, 1967: 217, fig. 294; PØrez-Iaeigo, 1972: 269, fig. 18; 1980: 229; 1992: 365; 1993: 129, fig. 48C; Moskacheva, 1973: 278, fig. 1; Shaldybina, 1975: 344, fig. 866; Seniczak, 1977: 740, figs. 1A, 2A, 3A; 1978: 90, figs. 1-7, 10, 12, 13; Moraza et al., 1980: 21, fig. 54; Marshall et al., 1987: 323; Chistyakov, 1988: 2, figs. 2- 10; Beck and Woas, 1991: 78 ; Maruyama, 2003: 25, figs. 1-6; Subías, 2004: 167; Weigmann, 2006: 351 , fig. 187D & E; Bayartogtokh, 2007: 354, fig. 280; 2010: 326: fig. 83E-J.

Diagnosis — With character states of Achipteria (see Balogh and Balogh, 1992 and Weigmann, 2006 for generic diagnosis); total length 530 – 650 µm, dorsal and ventral plates with minute granular cerotegument; lamellae fused medially, but lamellar cusps well separated from each other; lateral dens large, projected; sensillus with slightly expanded fusiform or elongate-oval head, smooth or finely barbed; notogastral setae minute or represented by their alveoli; coxisternal setal formula 3-1-3-2(3); tutorium narrow, slightly widening anteriorly in long cusp pointed distally; pedotectum I without anterior tooth.

Measurements — Body length: 573 – 620 (604) µm, length of notogaster 520 – 533 (525) µm, width of notogaster 403 – 468 (430) µm.

Integument — Body color dark brown, heavily sclerotized species with minute microtubercles on lateral part of podosoma, exobothridial and lenticular regions. Granular cerotegument clearly evident at base of prodorsum and on mentum.

Dorsal aspect — Rostrum rounded in dorsal view, but curved and distinctly pointed ventrally in lateral aspect. Rostral seta (ro) long, barbed, curving medially, and extending well beyond tip of rostrum ( Figs. 1E and 2A ). Lamellae fused medially, lamellar cusp with large, sharp dens laterally; medial dens absent. Lamellar seta (le) shorter than ro, thin, smooth or finely barbed, inserted medially on ventral side of lamellar cusp ( Figs. 1B and 2A ). Interlamellar seta (in) long, lightly barbed, extending anteriorly beyond tip of lamella. Exobothridial seta (ex) short, thin, finely barbed, hardly discernable. Sensillus or bothridial seta with slightly expanded fusiform or elongate-oval head about onethirds to two-thirds total length ( Figs. 1A and 2A ). Notogaster longer than wide, ratio 1.2:1; anterior and posterior margins broadly rounded. Lenticular region subtriangular with diffuse margins, but weakly visible and lacking true lenticulus. Notogastral setae represented only by their alveoli. Sacculi small, but clearly visible; lyrifissures not evident. Pteromorph with large knife-like process, tip of which reaches level of rostrum ( Figs. 1C , 2A and C ).

Lateral aspect — Tutorium narrow, appearing pointed in dorsal aspect, but slightly widening anteriorly in distinct cusp ending with one or two small teeth ( Fig. 1D ). Genal tooth rounded to sharply pointed distally, with genal notch extending posterior to insertion of seta ro. Pedotectum I well developed, fully covering acetabulum I; pedotectum II small, ear-shaped, covering less than a quarter of acetabulum II. Lateral edge of pteromorph with longitudinal striations ( Fig. 2C ).

Ventral aspect — Subcapitular mentum without tectum, relatively smooth throughout; setae h, m and a medium long, smooth. Chelicera chelatedentate, cheliceral setae long, setiform, barbed, seta cha longer than chb. Palp typical for family, formula of setation: 0-2-1-3-10 including solenidion ω on tarsus; axillary saccule absent from base of palp. Epimeral setae relatively long, thin, apparently smooth, formula 3-1-3-2, insertions of setae 3b and 3c closely adjacent, seta 4c not evident. Six pairs of genital, one pair of aggenital, two pairs of anal and three pairs of adanal setae thin, smooth (one specimen from Russian Far East showed only five pairs of genital setae). Lyrifissure iad adjacent and parallel to anal aperture ( Figs. 1C and 2B ).

Legs — Each tarsus with large empodial claw and thin lateral claws. Setation of legs typical for family as in Anachipteria deficiens (see below). Most of setae finely barbed, except few distal or ventral setae on tarsi, femur and trochanter. Formula of setation, including famulus: I (1-5-3-4-20), II (1-5- 3-4-15), III (2-3-1-3-15), IV (1-2-2-3-12), formula of solenidia I (1-2-2), II (1-1-2), III (1-1-0), IV (0-1-0). Homology of leg setae and solenidia showed in Table 1.

Material examined — Ten specimens (six males and four females): Close to village Plastun , District Ternei , Primorsk Krai, Russian Far East, oak forest litter, 15 June 2005, Col. A. Zaytsev ; two specimens (females): Gurvan Golyn Belchir area , District Sumber, Province Dornod, Mongolia, southern slope of the hill, litter and soils under shrubs, 46 o 57’N, 119 o 30’E, 972 m. a.s.l., 27 May 2003, Col. B. Bayartogtokh.

Remarks — The character states of specimens examined here accord well with those studied by PØrez-Iaeigo (1972, 1993), Shaldybina (1975), Seniczak (1977, 1978), Chistyakov (1988), Weigmann (2006) from Europe, and by Maruyama (2003) from Asia. Seniczak (1978) showed three pairs of setae on epimere IV in tritonymph of this species, but we observed only two pairs of setae. Chistyakov (1988) provided the epimeral setal formulas as 3-1-3-3 for tritonymph, but 2-1-2-3 for adult of this species.

Figures

FIGURE 1: Achipteria coleoptrata (Linnaeus, 1758): A – Dorsal view of idiosoma, legs omitted; B – Dorso-frontal view of lamellar cusps; C – Ventral view of idiosoma, legs omitted; D – Tutorium, right, lateral view; E – Rostral seta, right.

FIGURE 2: Achipteria coleoptrata (Linnaeus, 1758): A – Part of prodorsum and anterior part of notogaster; B – Ano-genital region; C – Pteromorph, dorsal view, after dissection.