Endonura transcaucasica Stach 1951
Creators: name: Smolis, Adrian
Publisher: name: Zenodo
Year: 2016
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Entognatha
Collembola
Neanuridae
Endonura
Endonura transcaucasica

description: Endonura transcaucasica (Stach, 1951)
Figs 1–7, Tab. 1
Biloba transcaucasica: Stach 1951: 34.
Type material. Lectotype by present designation: adult female on slide, Georgia, Caucasus, Tbilisi, 21.IV.1918, leg. Roszkowski, coll. J. Stach (ISEA).
Diagnosis. Habitus typical of the genus Endonura. Dorsal tubercles present and well developed. 2+2 pigmented eyes. Buccal cone short, labrum nonogival. Head with chaetae A, B, D, E, F and G. Chaetae O and C absent. Tubercles Cl and Af separate. Chaetae D free. Tubercles Dl and (L+So) on head with 6 and 7 chaetae respectively. Tubercles Di and De on th. I present and separate. Tubercles De on th. II and III with 3 and 4 chaetae respectively. Tubercles L on abd. III and IV with 3 and 6 chaetae respectively. Abd. IV and V with 8 and 3 tubercles respectively. Claw without inner tooth. Tibiotarsi with chaetae B4 and B5 short.
Redescription. Habitus typical of the genus. Body length of lectotype (without antennae): 1.65 mm. Colour of the body white. 2+2 large pigmented eyes (Fig. 1).
Types of dorsal ordinary chaetae. Macrochaetae Ml relatively long, strongly thickened, almost cylindrical, arclike or straight, narrowly sheathed, densely serrated, apically rounded (Figs 1, 5–7); macrochaetae Mc and Mcc thickened, straight and rounded at apex or pointed; mesochaetae and microchaetae short, thin, feebly serrated and pointed.
Head. Buccal cone short. Labrum nonogival, with ventral sclerifications as in Fig. 2. Labrum chaetotaxy 2/2, 4. Labium with four basal, three distal and four lateral chaetae, papillae x absent. Maxilla and mandible as in Figs 3, 4. Antennal segments I and II with 7 and 11 chaetae respectively. Chaetotaxy of antennal segments III and IV impossible to recognize. Apical vesicle poorly visible, trilobed. Chaetotaxy of head as in Tab. 1 a, b, and Fig. 1. Head with chaetae A, B, D, E, F and G. Chaetae O and C absent. Tubercles Cl and Af separate. Chaeta D free. Tubercle Dl with 6 chaetae, chaeta Dl3 present. Tubercle (L+So) with 7 chaetae, chaetae So2, So5 and L3 absent (Fig. 1). Elementary tubercles BE and CD present. Chaeta E connected with tubercle Af. Chaeta A shorter than B. Tubercle Oc with two chaetae, chaeta Oca absent (Fig. 1). Chaetae Ocp longer than A. Chaeta De2 as mesochaeta.
Thorax, abdomen, legs. Body s–chaeta thin and smooth, distinctly shorter than nearby macrochaetae (Fig. 5). Chaetotaxy of th. and abd. as in Tab. 1 d and in Figs 1, 5–7. Tubercles Di on th.I well differentiated and not fused with De. Tubercles De on th. II and III with 3 and 4 chaetae respectively. Chaetae De2 on th. II–III and De3 on th. III connected with tubercle De. Chaetae De3 on abd. I–III connected with tubercle De (Fig. 5). Chaetae De3 on Th. III and abd. I-III slightly longer than De2. The line of chaetae De1–chaeta s perpendicular to the dorsomedian line on abd. I–III (Fig. 5). Furca rudiment without microchaetae. Abd. IV and V with 8 and 3 tubercles respectively, tubercles Di on abd. V fused (Fig. 6). Tubercle L on abd. IV with 6 chaetae (Fig. 7). Chaetae L' and Vl on abd. V present. No cryptopygy. Chaetotaxy of legs as in Tab. 1 d.. Claw without inner tooth. Tibiotarsi with chaetae B4 and B5 short.
a) Cephalic chaetotaxy––dorsal side.
b) Cephalic chaetotaxy––ventral side.
c) Postcephalic chaetotaxy.
Terga Legs
Di De Dl L Scx2 Cx Tr Fe T th. I 1 2 1 - 0 3 6 1 2 1 9 th. II 3 2+s 3+s+ms 3 2 7 6 11 19 th. III 3 3+s 3+s 3 2 8 6 1 0 1 8
Sterna
abd. I 2 3+s 2 3 VT: 4
abd. II 2 3+s 2 3 Ve: 5 Ve1 - present
abd. III 2 3+ s 2 3 Vel:4 Fu: 5–6 me 0 mi abd. IV 2 2+ s 3 6 Vel: 3 Vec: 2 Vei: 2 Vl: 4 abd. V (3+3) 5+s Ag: 3 Vl: 1 L': 1 abd. VI 7 Ve:13-14 An: 2mi Discussion. Because of the absence of chaetae C and O on head, feature generally very rarely observed within Endonura, E. transcaucasica resembles E. baculifer Deharveng, 1979 described from Portugal. However, both species differ in a few characters, important from Neanurinae taxonomy point of view: presence/absence of chaetae E on head (in transcaucasica present, in baculifer absent) number of chaetae Dl on head (in transcaucasica 6, in baculifer 5) and number of chaetae (L+So) on head (in transcaucasica 8, in baculifer 7–9). In addition, the scientific name of Portugal species was derived from an unusual shape of its macrochaetae Di 1 of abdomen V which are extremely thickened and blunt at apex (Deharveng 1979: Figs 9 B, C).
description: Published as part of Smolis, Adrian, 2016, On the identity of some poorly known species of the genus Endonura Cassagnau, 1979 (Collembola, Neanuridae, Neanurinae), pp. 237-250 in Zootaxa 4173 (3) on pages 238-239, DOI: 10.11646/zootaxa.4173.3.3, http://zenodo.org/record/159328