Endonura dobrolyubovae, Smolis, Adrian & Kuznetsova, Nataliya, 2016

Smolis, Adrian & Kuznetsova, Nataliya, 2016, Remarkable diversity of the genus Endonura Cassagnau, 1979 (Collembola: Neanuridae: Neanurinae) in the Caucasus, Zootaxa 4200 (1), pp. 47-82 : 58-61

Endonura dobrolyubovae sp. nov.

Figs 25–40 , Tab. 4

Type material. Holotype: adult female on slide, Russia, Caucasus, Krasnodarsky Krai, Adygeya, Lagonaki Plateau ('Kamennoye More"), 1748 m alt., litter mountain coniferous forest ( Abies nordmanniana ), N44.08259 ˚, E40.00691 ˚, 5.VII.2014, leg. M. Potapov, N. Kuznetsova, A. Kremenitsa ( MSPU) . Paratypes: 2 males on slides, same data as holotype ( DIBEC and MSPU) .

Other material. Male on slide, Russia, Caucasus , Krasnodarsky Krai , up from Krasnaya Polyana, Aibga Range (ropeway Gornaya Karusel), northern slope, 2300 m alt., alpine zone, under Rhododendron caucasicum , N43.64175 ˚, E40.26222 ˚, 29.VI.2014, leg. M.Potapov, N. Kuznetsova, A. Kremenitsa ; female and juvenile on slides, Russia, Caucasus , Krasnodarsky Krai, road between Tuapse and Khadyzhensk, surroundings of Gothski pass, about 300 m alt., litter from beech forest ( Fagus orientalis ) on a slope, N44.26951 ˚, E39.27032 ˚, 7.VI.2013, leg. M. Potapov, A. Kremenitsa ; female on slide, Russia, Caucasus , Krasnodarsky Krai , up from Krasnaya Polyana , Achishkho Range, road to Khmelevskiye Lakes, beech forest, decaying bark on lying tree, N43.70180 ˚, E 40.23352 ˚, 30.VI.2014, leg. M. Potapov, N. Kuznetsova, A. Kremenitsa ; female on slide, Russia, Caucasus , Krasnodarsky Krai , up from Krasnaya Polyana , eastern spurs of Achishkho Range , Khmelevskiye Lakes, observation deck “ Far ”, under Rhododendron caucasicum, 1913 m alt., N43.72683 ˚, E40.17008 ˚, 30.VI.2014, leg. M. Potapov, N. Kuznetsova, A. Kremenitsa; (slides housed in MSPU and DIBEC).

Etymology. The new species is dedicated to our colleague Tatiana Dobrolyubova who has made a contribution to the study of Collembola of Caucasus.

Diagnosis. Habitus typical of the genus Endonura . Dorsal tubercles present and well developed. 2+2 eyes darkly pigmented. Buccal cone notably short, labrum nonogival. Head with chaetae A, B, O, C, D, F and G. Chaetae E absent. Tubercles Cl and Af separate. Tubercles Dl and (L+So) on head with 5 and 8 chaetae respectively. Tubercles Di and De on th. I not fused. Tubercles De on th. II and III with 3 and 4 chaetae respectively. Tubercles L on abd. III and IV with 4 and 7 chaetae respectively. Abd. IV and V with 8 and 3 tubercles respectively. “Male ventral organ” present. Claw with inner tooth. Tibiotarsi with chaetae B4 and B5 relatively short.

Description. Habitus typical of the genus. Body length (without antennae): 1.25 (juvenile)– 2.48 mm (holotype: 1.65 mm). Colour of the body bluish grey. 2+2 medium dark pigmented eyes ( Fig. 27 ).

b) Cephalic chaetotaxy–ventral side.

c) Chaetotaxy of antennae.

d) Postcephalic chaetotaxy.

Terga Legs

Di De Dl L Scx2 Cx Tr Fe T th. I 1 2 1 - 0 3 6 1 3 1 9 th. II 3 2+s 3+s+ms 3 2 7 6 12 19 th. III 3 3+s 3+s 3 2 8 6 1 1 1 8

Sterna

abd. I 2 3+s 2 3 VT: 4

abd. II 2 3+s 2 3 Ve: 4–5; chaeta Ve 1 present abd. III 2 3+s 2 4 Vel:5; Fu: 6–7 me, 0 mi

abd. IV 2 2+s 3 7 Vel: 4; Vec: 2; Vei: 2; Vl: 4

abd. V (3+3) 7+s Ag: 3; Vl: 1

abd. VI 7 Ve: 14; An: 2mi

Types of dorsal ordinary chaetae. Macrochaetae Ml relatively thin, long, straight or slightly arc–like, narrowly sheathed, feebly serrated, apically rounded or rarely pointed ( Figs 27, 31 , 38, 39 ); macrochaetae Mc and Mcc thin, straight, apically rounded or pointed; mesochaetae and microchaetae short, thin and pointed.

Head. Buccal cone notably short ( Fig. 25 ). Labrum rounded, with ventral sclerifications nonogival as in Fig. 26 . Labrum chaetotaxy 4/2, 4. Labium as Fig. 25 . Maxilla styliform ( Fig. 32 ), mandible thin with two basal and two apical teeth ( Fig. 33 ). Chaetotaxy of antennae as in Figs 28–30 and Tab. 4 c. Apical vesicle distinct trilobed ( Fig. 29 ). S-chaetae of ant. IV of medium length and thickness. Chaetotaxy of head as in Tab. 4 a, b, and Figs 25, 27 . Chaetae D free. Tubercle Af on head longer than tubercles Oc. Chaeta Ocp longer than A ( Fig. 27 ). Tubercle Dl with 5 chaetae, chaeta Dl3 absent. Tubercle (L+So) with 8 chaetae, chaetae So3 and L3 absent ( Fig. 27 ). Elementary tubercle BE present. Chaeta A shorter than B.

Thorax, abdomen, legs. Body s-chaetae fine and smooth, distinctly shorter than nearby macrochaetae ( Figs 31 , 39 ). Chaetotaxy of thorax and abdomen as in Tab. 4 d and in Figs 27, 31 , 34, 39 . Tubercles Di on th. I not differentiated ( Fig. 31 ). Chaetae De2 on th. II–III and De3 on th. III free. Chaetae De3 on abd. I–III free ( Fig.31 ).

The line of chaetae De1-chaeta s parallel to the dorsomedian line on abd. I–III. Furca rudimentary without microchaetae. Male with thick and forked chaetae (“male ventral organ”) on anal plates (abd. VI) and in groups: Ag (abd. V), Ve and Vl (abd. IV), Fu and Ve (abd. III, Figs 34, 37 ). Tubercles Di on abd. V fused, with chaetae Di2 as Mc and Di3 as mi ( Fig. 39 ). Chaetae Vl on abd. V present. Cryptopygy slightly developed. Chaetotaxy of legs as in Fig. 35 and Tab. 4 d. Claw with distinct inner tooth ( Figs 35, 36 ).

Remarks. E. dobrolyubovae sp. nov. is similar to E. persica Smolis et al., 2016 , by its short buccal cone and non ogival labrum, the same number of lateral chaetae Dl and (L+So) on head, the absence of chaeta O on head, the presence of the same free chaetae on dorsal side of th. and abd., and presence of toothed claws (Smolis et al. 2016). However, they are different in the length of chaeta Ocp (in dobrolyubovae distinctly longer than chaeta A, in persica slightly shorter than A), the presence/absence of elementary tubercles BE on head (in dobrolyubovae present, in persica absent), the presence/absence of chaetae E on head (in dobrolyubovae absent, in persica present) and the presence/absence of “male ventral organ” (in dobrolyubovae present, in persica absent).

Ecological note. The species was collected both in litter of different type of mountain forests ( Fig. 40 ), and in alpine zone under rhododendron’s shrubs.

Figures

FIGURE 40. Mountain coniferous forest (dominated by Caucasian fir Abies nordmanniana) at Lagonaki Plateau, type locality of Endonura dobrolyubovae sp. nov.

FIGURES 25 – 33. Endonura dobrolyubovae sp. nov.: 25, chaetotaxy of labium and group Vi; 26, ventral sclerifications of labrum; 27, dorsal chaetotaxy of head and th. I; 28, dorsal chaetotaxy of ant. III – IV; 29, apical bulb; 30, ventral chaetotaxy of ant. III – IV; 31, dorsal chaetotaxy of th. II – III and abd. I; 32, maxilla; 33, mandible.

FIGURES 34 – 39. Endonura dobrolyubovae sp. nov.: 34, ventral chaetotaxy of abd. III – V (adult male); 35, tibiotarsus and claw III, dorsolateral view; 36, claw III, lateral view; 37. chaetae of male ventral organ; 38, chaeta Di 1 of abd. V; 39, dorsal chaetotaxy of abd. IV – VI (holotype).

Tables

TABLE 4. Chaetotaxy of Endonura dobrolyubovae sp. nov.: a) Cephalic chaetotaxy – dorsal side.

Tubercle	Number of chaetae	Types of chaetae	Names of chaetae
Cl	4	Ml Mc	F G
Af	8	Ml Mc Mcc	B A C, D
Oc	3	Ml mi	Ocm, Ocp Oca
Di	2	Ml Mcc	Di1 Di2
De	2	Ml Mcc	De1 De2
Dl	5	Ml Mcc mi	Dl1, Dl5 Dl4 Dl2, Dl6
(L+So)	8	Ml Mcc me	L1, L4, So1 L2 So3–6