Deutonura breviseta

Description. General. Body length (without antennae): 0.7 (juvenile) to 1.7 mm (holotype: 0.85 mm). Colour of the body white. 2 + 2 large black eyes, in a typical arrangement for the genus (Figs 42, 43). Chaetal morphology. Dorsal ordinary chaetae of five types: long macrochaetae (Ml), short macrochaetae (Mc), very short macrochaetae (Mcc), mesochaetae and microchaetae. Long macrochaetae thickened, slightly arc-like or straight, narrowly sheathed, serrated, apically rounded and extended at apex (Figs 42, 43, 50, 52). Macrochaetae Mc and Mcc morphologically similar to long macrochaetae, but much shorter (Figs 42, 43, 50). Mesochaetae similar to ventral chaetae, thin, smooth and pointed. Microchaetae similar to mesochaetae, but clearly shorter (Figs 42, 43). S-chaetae of terga thin, smooth and short, notably shorter than nearby macrochaetae (Figs 42, 50, 51). Antennae. Typical of the genus. Dorsal chaetotaxy of Ant. III-IV as in Fig. 46 and Table 11. S-chaetae of Ant. IV of medium length and relatively thin, sensillum sgd short and straight (Fig. 46). Apical vesicle distinct, trilobate (Figs 44, 45). Ventral chaetotaxy of Ant. III as in Fig. 47 and Table 11, ventral chaetotaxy of Ant. IV as Table 11. Mouthparts. Buccal cone relatively short and wide, labral sclerifications nonogival (Fig. 42). Labrum chaetotaxy: 2 / 2, 4. Labium with four basal, three distal and four lateral chaetae, papillae x absent. Maxilla styliform mandible thin and tridentate. Dorsal chaetotaxy and tubercles. Head without granular area between chaetae A and B. Elementary tubercles DE and EE on head absent (Fig. 42). Head without chaetae E, O and L 3, chaeta D free (Figs 42, 43). Chaetae Ocm and Ocp of nearly equal length. Chaetae De 2 on head usually as Mcc, rarely as mi (Fig. 42). Chaeta Dl 6 on head as Mccormi. Th. I with tubercles Di and De not fused. Chaetae Di 3 on Th. II-III free. On Th. III, chaetae De 2 slightly shorter than De 3 (Fig. 42). On Abd. I-III, chaetae De 2 distinctly shorter than De 3 (Fig. 50). Cryptopygy absent, Abd. VI well visible from above. Ventral chaetotaxy. On head, groups Vea, Vem and Vep with 3, 4 and 4 chaetae, respectively. Group Vi on head with 6 chaetae. On Abd. IV, furca rudimentary without microchaetae. Male with thick and forked chaetae (male ventral organ) around genital aperture (Abd. V). On Abd. V, chaetae Vl and L' present (Fig. 48). Legs. Chaetotaxy of legs as in Table 12. Claw without internal tooth (Fig. 49). On tibiotarsi, chaeta M present and chaetae B 4 and B 5 relatively long and pointed.

Diagnosis. Habitus typical of the genus Deutonura. Dorsal tubercles present and well developed. 2 + 2 large pigmented eyes. Buccal cone relatively long and wide, labrum without ogival sclerifications. Head without chaetae E, O and L 3. Tubercles Cl and Af separate. No granular area between chaetae A and B on head. Tubercles De on Th. II and III with 3 and 4 chaetae, respectively. Tubercles Di on Abd. V not bilobed. Cryptopygy not developed. Male ventral organ present.

Etymology. The name of the new species is referring to its exceptionally short macrochaetae Ml.

Other material. Iran, female on slide, Gilan Province, Asalem (37 ° 45 ' N, 48 ° 57 ' E), leaves and tree holes, sifting, 11. VI. 1975, leg. A. Senglet, 7519; female, male and 2 juveniles on slide, Gilan Province, Paresar, tree holes, leaves, sifting, 2. VII. 1973, leg. A. Senglet, 7310; male on slide, Mazandaran Province, Nashtarud, forest, reserve, sifting, 10. VII. 1973, leg. A. Senglet, 7318; female and 3 males on slide, Mazandaran Province, near Amol, forest, sifting, 18. VII. 1973, leg. A. Senglet, 7329 b; 4 females, 3 males and juvenile on slide, Mazandaran Province, Aliabad, 30. VII. 1974, leg. A. Senglet, 7475; female on slide, Gilan Province, road to Dyavaherdeh, 1100 - 1300 m a. s. l., 7. VIII. 1974, leg. A. Senglet, 7484.