Tarbagataya zaisanica Mikhaljova

Mikhaljova, Elena V., Burkitbaeva, Ulzhan D., Tuf, Ivan H. & Ulykpan, Kaman, 2013, The millipede order Chordeumatida (Diplopoda) in Kazakhstan, with descriptions of three new species, Zootaxa 3635 (5), pp. 533-544 : 538-542

Tarbagataya zaisanica Mikhaljova sp. nov.

Figs 10–23

Material examined. Holotype: 1 male (IBSS), Kazakhstan, Vostochno-Kazakhstanskaya Area, Zaisan District, 1662 m a.s.l., 12 July 2011, leg. K. Ulykpan and U.D. Burkitbaeva. Paratypes: 1 male, 2 juveniles (IBSS), Kazakhstan, Vostochno-Kazakhstanskaya Area, Zaisan District, 1755 m a.s.l., 6 July 2011; 2 males, 2 females, 1 juv. (IBSS), Kazakhstan, Vostochno-Kazakhstanskaya Area, Zaisan District, forest, 8 July 2011; 1 male, 2 females, 1 juvenile (IBSS), Kazakhstan, Vostochno-Kazakhstanskaya Area, Zaisan District, 1848 m a.s.l., 8 July 2011; 1 male, 1 female (ZMUM), Kazakhstan, Vostochno-Kazakhstanskaya Area, Zaisan District, 1793 m a.s.l., 9 July 2011; 1 female, 1 juvenile (IBSS), Kazakhstan, Vostochno-Kazakhstanskaya Area, Zaisan District, 1793 m a.s.l., 11 July 2011; 1 male, 3 females (IBSS), together with holotype, 12 July 2011; 1 male, 2 females, 1 juvenile (PU), Kazakhstan, Vostochno-Kazakhstanskaya Area, Zaisan District, 1680 m a.s.l., 13 July 2011; 2 males (IBSS), Kazakhstan, Vostochno-Kazakhstanskaya Area, Zaisan District, 1662 m a.s.l., 13 July 2011; 1 male, 11 females, 4 juveniles (IBSS), Kazakhstan, Vostochno-Kazakhstanskaya Area, Zaisan District, 1735 m a.s.l., 17 July 2011; all leg. K. Ulykpan and U.D. Burkitbaeva.

Diagnosis. Differs from its only congener Tarbagataya splendida Golovatch & Wytwer, 2003 mainly by the structure of the posterior gonopods, with the coxal process supplied with three teeth, the structure of leg pair 7 with tongue-shaped, long, apically bilobate sternal protuberance, the structure of the anterior gonopods as well as the presence of tarsal papillae in males.

Description. Male. Length 10–11 mm, width of midbody metazona 0.7–0.8 mm. Coloration in alcohol light brown or brown with marbled, annulated pattern due to pale stricture between pro- and metazona as well as with light marbled spots on sides; this spots gradually decrease towards the telson. Ventral side pale. Clypeolabral region of head with pattern of small light spots of different shapes. Antennae brown, marbled brown distally. Legs pale with marbled light brown distal portions. Ocellaria black.

Body with 28 segments. Head covered with short and relatively long setae. Clypeolabral region slightly convex. Eye patches triangular, each composed of at least 18 ocelli. Antennae in situ reaching to posterior margin of body segment 4. Collum semi-circular. Body juloid, subcylindrical, somewhat moniliform. Paraterga missing. Metazona of anterior body segments with low bulges laterally. Metazonital macrochaetae in a transverse row on somites 25–27, like an elongate (to different degrees) triangle on preceding somites. Numerous macrochaetae broken off, remaining ones middle length, pointed apically.

Leg pairs 3–6 slightly enlarged, with funnel-shaped tarsal papillae throughout ventrally; claw at base with two small additional claws dorsally and short setoid filament ventrally; coxae micropapillate ventrally. Postgonopodal legs (including leg pairs 10 and 11) with funnel-shaped tarsal papillae gradually missing toward end of body (tarsal papillae of leg pairs 10 and 11 occupying 2/3 length of tarsus i.e. space near claw free from papillae; tarsal papillae of midbody legs reaching to middle of tarsus i.e. distal part of tarsus free from papillae; hindmost legs without tarsal papillae); claw at base with two small additional claws dorsally and short setoid filament ventrally. In some individuals small dorsal additional claws on claws of hindmost legs missing. Claw of leg pairs 1 and 2 at base with two small additional claws dorsally and short setoid filament.

Leg 7 strongly modified ( Figs 10–11 , 17 ); each coxite ventrally elongated in tongue-shaped process covered with setae medially and papillae laterally; telopodites 2-segmented, setose ventrally; sternite with long protuberance bilobate apically.

Legs 10 with coxal glands but without other modifications. Legs 11 without coxal glands; coxae micropapillate ventrally.

Anterior gonopods ( Figs 12–13 , 19–21 ) with subtriangular, ventrally slightly bilobed sternite. Coxite with two branches. Mesal branch (mb) as numerous long filaments one or two of which longer than others. Lateral branch (lb) curved caudad, its mesal part thin fold covering mb frontally and enveloping mb mesodistally. Solenomere barely traceable on lateral branch. In posterior view ( Figs 13 , 20 ) anterior gonopods with pair of sacculiform structures (s) (modified coxal glands?).

Posterior gonopods ( Figs 14 , 18 ) reduced to a cupped coxosternum with normal tracheal apodemes. Coxal part with process supplied with three teeth. Sternal part with a high median process frontally.

Female. Body with 28 segments. Length 11–12 mm, width of midbody metazona 0.9–1.0 mm. Leg 2 typical, not reduced. Vulvae ( Figs 15–16 , 22–23 ) oblong with long setae ventrally. Operculum bilobate. Receptaculum seminis central in position. In some individuals small dorsal additional claws at base of claws of hindmost legs missing.

Name. The specific epithet refers to the type locality.

Remarks. Up to now Tarbagataya included only one species - T. splendida Golovatch & Wytwer, 2003 , described from East Kazakhstan (Golovatch & Wytwer 2003). T. zaisanica sp. nov. is the second species of this genus. One of the distinguishing characters of Tarbagataya is the absence of tarsal papillae in males because they are absent in the type species T. splendida . However because tarsal papillae are present in T. zaisanica sp. nov., the original diagnosis of the genus must be changed accordingly. Thus, tarsal papillae in the males of Tarbagataya species are absent or present.

Figures

FIGURES 10 – 14. Tarbagataya zaisanica sp. nov., male paratype. 10, leg pair 7, caudal view; 11, leg pair 7, front view; 12, anterior gonopods, front view; 13, anterior gonopods, caudal view; 14, posterior gonopods, front view; mb, mesal branch of coxite; lb, lateral branch of coxite; s, saculiform structure of anterior gonopod.

FIGURES 15 – 16. Tarbagataya zaisanica sp. nov., female paratype. 15, vulva, ventral view; 16, vulva, lateral view.

FIGURES 17 – 23. Tarbagataya zaisanica sp. nov., male paratype (17 – 21), female paratype (22 – 23). 17, leg pair 7, caudal view; 18, posterior gonopods, front view; 19, left anterior gonopod, lateral view; 20, anterior gonopods, caudal view; 21, anterior gonopods, front view; 22, left vulva, mesal view; 23, vulva, ventral view; mb, mesal branch of coxite; lb, lateral branch of coxite; s, saculiform structure of anterior gonopod. Scales in mm.