Micranurida Börner, 1901

Gao, Yan, Palacios-Vargas, José G., Arango, Angela & Bu, Yun, 2024, First records of Micranurida and Philotella (Collembola, Neanuridae, Pseudachorutinae) from China with the description of three new species, Zootaxa 5555 (1), pp. 116-124 : 117

Genus Micranurida Börner, 1901

Type species: Micranurida pygmaea Börner, 1901

Diagnosis. Body clothed sparely with short setae, sensorial setae thin and short, except for those on Th. II and Th. IV. Skin mostly coarsely granulated; sometimes on the head and tergites there are areas composed of larger granules than those of the neighborhood. With 2 + 2 eyes, 1 + 1 or none. PAO always present, in rosette shape, with 5–18 vesicles, in one row, usually simple oval peripheral tubercles, arranged in a circle or ellipse. Buccal cone moderately projected. Mandible without molar area apically with 2–3, rarely up to 5 teeth. Head of maxilla untoothed, strongly lengthened, styliform, needle-like, with two lamellae fused and ending in a hook. Labium without setae “L”. Antennae short conical or cylindrical. Ant. III and IV fused on dorsal surface, separated ventrally. Sensorial ogran of Ant. III with 2 subequal inner sensilla and two long guard sensilla, the ventral one of which usually S-shaped, ventral microsensillum also present. Five or six sensilla on Ant. IV spherical, flame- or hammer-like, and some of them fused in a few cases. Dorsolateral curved microsensillum, with or without tiny subspherical organite, apical bulb on Ant. IV simple or slightly trilobed. Each side of Th. II with one lateral microsensillum. Seta d0 present on head. Setae m1 are absent in Th. II, Th. III and Abd. IV. Ventral Abd. II and III usually with an unpair seta, which rarely absent. Each anal valve with 2–3 microsetae. There are no anal spines. Ventral tube with 4 + 4 setae. No furcula, furcal vestige with few microsetae. Tibiotarsi without tenent hairs. Unguis without teeth, no empodial appendix (modified from Deharveng 1982).