Paravietnura rostrata

Description. General. Body length (without antennae): holotype: 0.45 mm. Colour of the body bluish. 2 + 2 large black eyes, in a typical arrangement for the genus (Fig. 75). Chaetal morphology. Dorsal ordinary chaetae of five types: long macrochaetae (Ml), short macrochaetae (Mc), very short macrochaetae (Mcc), mesochaetae and microchaetae. Long macrochaetae thickened, arc-like, widely sheathed, strongly serrated, apically rounded (Figs 75, 79, 81). Macrochaetae Mc and Mcc morphologically similar to long macrochaetae, but much shorter (Figs 75, 79). Mesochaetae similar to ventral chaetae, thin, smooth and pointed. Microchaetae similar to mesochaetae, but clearly shorter (Figs 75, 79). S-chaetae of terga thin, smooth and short, shorter than nearby macrochaetae (Figs 75, 79, 82). Antennae. Typical of the genus. Dorsal and ventral chaetotaxy of Ant. III-IV as in Figs 72 - 74 and Table 20. S-chaetae of Ant. IV relatively short and thin (Fig. 72), sensillum sgd of medium size and straight (Fig. 73), sensillum sgv relatively long and slightly s-shaped (Fig. 74). Apical vesicle distinct, bilobate (Fig. 72). Mouthparts. Buccal cone extremely elongated with labral sclerifications ogival (Figs 76, 77). Labrum chaetotaxy: 0 / 2, 4, without prelabral chaetae (Fig. 76). Labium with three basal, three distal and two lateral chaetae, papillae x absent (Fig. 77). Maxilla styliform mandible thin and tridentate. Dorsal chaetotaxy and tubercles. Chaetotaxy of head as in Fig. 75 and Table 19. Chaetotaxy of Th. and Abd. As in Figs 75, 79 and Table 21. On Th. I, tubercle De with one chaeta (Fig. 75). On Th. II and III, chaetae Di 3 absent. Th. II and III with two chaetae De (Fig. 75). On Abd. IV, chaetae Di 1 distinctly longer than Abd. V (Fig. 79). On Abd. V, chaetae Di 2 and Di 3 absent. Tubercle Di of Abd. IV partially fused (Fig. 79). Cryptopygy present and strongly developed, Abd. VI invisible from above (Fig. 79). Ventral chaetotaxy. On head, groups Vea, Vem and Vep with 3, 2 and 4 chaetae, respectively. Group Vi on head with 5 chaetae (Fig. 77). On Abd. IV, furca rudimentary with 4 minute microchaetae and 4 mesochaetae (Fig. 78). On Abd. V, chaetae Vl present and L' absent. Legs. Chaetotaxy of legs as in Table 21. Claw without internal tooth (Fig. 80). On tibiotarsi, chaeta M present and chaetae B 4 and B 5 of medium size and pointed.

Diagnosis. Habitus typical of the genus Paravietnura with stumpy and short body. Macrochaetae long thick and widely sheathed. 2 + 2 large pigmented eyes. Buccal cone extremely long and narrow, labrum with ogival sclerifications. Tubercle (Af + 2 Oc) with chaetae B and Ocm, chaetae A and Ocp absent. Tubercle Cl without chaetae G. Tubercle (Dl + L + So) with 9 chaetae. Furca rudimentary with minute and difficult microchaetae, without chaetopores.

Etymology. The name of the new species referring to its exceptionally-long buccal cone.