Albanura secunda, Smolis, Adrian & Kuznetsova, Nataliya, 2018

Smolis, Adrian & Kuznetsova, Nataliya, 2018, The genera Albanura Deharveng, 1982 and Persanura Mayvan et al., 2015 are no longer monotypic: description of new species from the Caucasus (Collembola, Neanuridae, Neanurinae, Neanurini), ZooKeys 737, pp. 1-12 : 2

Albanura secunda sp. n. Figs 1-13, Tables 1, 2, 3

Type material.

Holotype: male on slide, Russia, Caucasus,Karachaevo-Cherkessiya, Teberdinsky Reserve, spruce forest, litter, Oct.1978, leg. E. Dobrolyubova (DIBEC). Paratype: female on slide, same data as for holotype.

Etymology.

The name secunda refers to the fact that the new species is the second member of the genus.

Diagnosis.

Habitus similar to that of Albanura nana . Dorsal tubercles present and well developed. Buccal cone long, labrum ogival. Head with chaetae A, B, C, D and E. Chaeta O absent. Tubercles Dl and (L+So) on head with six and nine chaetae respectively. Tubercles De on Th. II and III with three and four chaetae respectively. Tubercles De on Abd. I–III with four chaetae. Tubercles L on Abd. III and IV with four and seven chaetae respectively. Abd. IV and V with seven and three tubercles respectively. Abd. V with 3+3 chaetae Di.

Description.

General. Body length (without antennae): 0.8 mm (holotype), 0.9 mm (paratype). Colour of the body white. 2+2 rather large black eyes, in a typical arrangement for the genus (one anterior and one posterior, Fig. 1).

Chaetal morphology. Dorsal ordinary chaetae of five types: long macrochaetae, short macrochaetae, very short macrochaetae, mesochaetae and microchaetae. Long macrochaetae relatively thick and short, straight, narrowly sheathed, feebly serrated, apically arc-like or rounded (Figs 1, 9, 12). Macrochaetae Mc and Mcc morphologically similar to long macrochaetae, but much shorter. Mesochaetae similar to ventral chaetae, thin, smooth and pointed. Microchaetae similar to mesochaetae, but shorter. S-chaetae of tergites thin, smooth and short, distinctly shorter than nearby macrochaetae (Figs 1, 9, 11).

Antennae. Typical of the genus. Dorsal chaetotaxy of Ant. III–IV as in Fig. 7 and Table 2. S-chaetae of Ant. IV of medium length and moderately thickened (Fig. 7). Apical vesicle distinct and trilobed (Fig. 6). Ventral chaetotaxy of Ant. III–IV as in Fig. 8 and Table 2.

Mouthparts. Buccal cone long with labral sclerifications ogival. Labrum chaetotaxy: 4/2, 4 (Fig. 5). Labium with four basal, three distal and four lateral chaetae, papillae x absent. Maxilla styliform, mandible thin and tridentate (Figs 3, 4).

Dorsal chaetotaxy and tubercles. Chaetotaxy of head as in Figs 1, 2 and Table 1. Chaetotaxy of thorax and abdomen as in Figs 3, 4 and Table 3. Th. III with chaetae De3 free (Fig. 1). On Abd. I–III, the line of chaetae De1-chaeta s is not perpendicular to the dorsomedian line. No cryptopygy, Abd. VI well visible from above (Fig. 9).

Ventral chaetotaxy. On head, groups Vea, Vem and Vep with 3, 3, 4 chaetae respectively. Group Vi on head with 6 chaetae. Group L on Abd. IV with 7 chaetae (Fig. 10). On Abd. IV, furca rudimentary with 8 microchaetae (Fig. 13). On Abd. V, chaetae Vl and L’ present.

Legs. Chaetotaxy of legs as in Table 3. Claw without internal tooth. On tibiotarsus, chaeta M present and chaetae B4 and B5 relatively short and pointed.

Remarks.

Albanura secunda sp. n is easily distinguished from A. nana Cassagnau & Péja, 1979, the only other known species in the genus, by its dorsal chaetotaxy: presence/absence of chaeta O on the head (absent in secunda ; present in nana ), presence/ absence of chaetae E on the head (present in secunda ; absent in nana ), number of chaetae Dl on the head (six in secunda ; five in nana ), number of ordinary chaetae De on Th. III (three in secunda ; two in nana ), number of ordinary chaetae De on Abd. I–III (three in secunda ; two in nana ), number of chaetae L on Abd. IV (seven in secunda ; five in nana ), and number of chaetae Di on Abd. V (3+3 in secunda ; 2+2 in nana ).