Endonura diminutichaeta, 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: 61-66

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Endonura diminutichaeta

sp. nov.

Endonura diminutichaeta  sp. nov.

Figs 41–48View FIGURES 41 – 47View FIGURE 48, Tab. 5

Type material. Holotype: adult male on slide, Russia, Caucasus , Krasnodarsky Krai , up from Krasnaya Polyana, Aibga Range (ropeway Gornaya Karusel), nothern slope, 2300 m alt., alpine zone, under Rhododendron caucasicum  , N43.64175 ˚, E40.26222 ˚, 29.VI.2014, leg. M. Potapov, N. Kuznetsova, A. Kremenitsa ( MSPU)GoogleMaps  . Paratypes: female and male on slides, same data as holotype ( DIBEC and MSPU)GoogleMaps  .

Other material. 2 females, male and 2 juveniles on slides, Russia, Caucasus , Krasnodarsky Krai, between Anapa and Novorossiysk, village Semigorsky, litter from broadleaved forest on canyon floor, N44.89285 ˚  , E37.61940 ˚, 5.VI.2013, leg. M. Potapov, A. Kremenitsa, M. Furgoł, Т. Maulana; male on slide, same data as holotypeGoogleMaps  ; 2 juveniles on slides, Russia, Caucasus , Krasnodarsky Krai , up from Krasnaya Polyana, Achishkho Range (road to Khmelevskiye Lakes), litter from beech forest, 1800 m alt., 30.VI.2014, leg. M. Potapov, N. Kuznetsova, A. Kremenitsa; ( DIBEC and MSPU). 

Etymology. The species name refers to notable morphological feature – unusual short chaeta Di1 on abd. IV.

Diagnosis. Habitus typical of the genus Endonura  . Dorsal tubercles present and well developed. Eyes 2+2, large and dark pigmented. Buccal cone long, labrum ogival. Head with chaetae A, B, O, C, D, E, F and G. Tubercles Cl and Af separate. Tubercles Dl and (L+So) on head with 4–5 and 10 chaetae respectively. Tubercles Di and De on th. I 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. Claw without inner tooth. Tibiotarsi with chaetae B4 and B5 relatively long.

Description. Habitus typical of the genus. Body length (without antennae): 0.57 (juvenile)– 1.9 mm (holotype: 1.4 mm). Colour of the body bluish grey. 2+2 large dark-pigmented eyes ( Fig. 43View FIGURES 41 – 47).

Types of dorsal ordinary chaetae. Macrochaetae Ml slightly thickened, relatively long, straight or rarely arclike, narrowly sheathed, feebly serrated, apically rounded or pointed ( Figs 43, 46View FIGURES 41 – 47); macrochaetae Mc and Mcc thickened, straight, pointed or apically rounded; mesochaetae and microchaetae short, thin and pointed.

Head. Buccal cone long. Labrum ogival, with ventral sclerifications as in Fig. 42View FIGURES 41 – 47. Labrum chaetotaxy 4/2, 4. Labium as Fig. 41View FIGURES 41 – 47. Maxilla styliform, mandible thin with two basal and two apical teeth. Chaetotaxy of antennae as in Figs 44, 45View FIGURES 41 – 47 and Tab. 5 c. Apical vesicle distinct, trilobed. S-chaetae of ant. IV of medium length and relatively thin ( Fig. 44View FIGURES 41 – 47). Chaetotaxy of head as in Tab. 5 a, b, and Fig. 43View FIGURES 41 – 47. Tubercle Af on head longer than tubercles Oc. Chaeta D free. Elementary tubercles CD and BE present ( Fig. 40View FIGURE 40). Chaeta A shorter than B.

Thorax, abdomen, legs. Body s-chaetae thin and smooth, shorter than nearby macrochaetae ( Fig. 46View FIGURES 41 – 47). Chaetotaxy of thorax and abdomen as in Tab. 5 d and in Figs 40View FIGURE 40, 45View FIGURES 41 – 47. Tubercles Di on th. I differentiated and fused with De ( Fig. 43View FIGURES 41 – 47). Chaetae De3 on th. III and abd. I –III as Mcc. Chaetae De2 on th. II –III and De3 on th. III free. Chaetae De3 on abd. I –III free ( Fig. 46View FIGURES 41 – 47). The line of chaetae De1-chaeta s parallel to the dorsomedian line on abd. I –III. Chaetae Di 1 on abd. III and IV notably short, at least four times shorter than Di1 of abd. V ( Fig. 46View FIGURES 41 – 47). Tubercles Di on abd. V fused, with chaetae Di3 as mi. Furca rudimentary without microchaetae. Chaetae Vl on abd. V present. Male without modified chaetae (“male ventral organ”). Cryptopygy slightly developed. Chaetotaxy of legs as in Fig. 47View FIGURES 41 – 47 and Tab. 5 d. Tibiotarsi with chaetae B4 and B5 relatively long. Claw without inner tooth ( Fig. 47View FIGURES 41 – 47).

Remarks. See remarks of E. alticola  and E. kremenitsai  sp. nov.

Variability. We observed two specimens, including holotype, with additional chaeta O ( Fig. 43View FIGURES 41 – 47). Ecological note. The type material of Endonura diminutichaeta  sp. nov. and Endonura aibgai  sp. nov. was collected within alpine zone, under Rhododendron caucasicum  ( Fig. 48View FIGURE 48). The species was also collected in lower elevations, in broadleaved forests.

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 3 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


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

abd. II 2 3+s 2 3 Ve: 5; chaeta Ve 1 present

abd. III 2 3+s 2 4 Vel: 3–5; Fu: 5–6 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: 13-14; An: 2mi

TABLE 5. Chaetotaxy of Endonura diminutichaeta sp. nov.: a) Cephalic chaetotaxy – dorsal side.

Tubercle Number of chaetae Types of chaetae