Tomocerus Nicolet, 1842

Yu, Daoyuan, Yang, Xiaodong & Liu, Manqiang, 2018, Three new species of Tomocerus from tropical zone of China (Collembola, Tomoceridae), Zootaxa 4508 (2), pp. 225-236 : 226

Genus Tomocerus Nicolet, 1842

Common characters for three new species. PAO absent. Eyes 6+6. Both dorsal and ventral sides of head scaled. Mouthparts normal for Tomocerus . Labral formula 4/5, 5, 4, distal edge of labrum with 4 curved spine-like papillae. Maxillary lamella 5 without beard-like appendage. Both dorsal and ventral sides of Ant. I and Ant. II scaled, Ant. III unscaled or occasionally with 1–2 basal scales, Ant. IV unscaled. Macrochaetae densely arranged along anterior margin of Th. II and sparsely on each terga, most mesochaetae laterally and posteriorly on terga. Number of macrochaetae or large mesochaetae in posterior row as 3 (p2, p3, p4), 3 (p1, p3, p5)/ 3 (m2, m3, m4), 3 (m2, m3, m4), 4 (p1, p3, p6, p7), 2 (p6, p7), 4 (m2, m3, m5, m6) from Th. II to Abd. V. Th. III with anterior macrochaeta a4; Abd. III with two anterior macrochaetae m3 and m6; Abd. IV with antero-lateral macrochaeta m6; Abd. VI with numerous chaetae of different sizes. Bothriotricha 2 (a6, m6), 1 (m6)/ 0, 0, 1 (a5), 2 (a2, a5), 0, 0 on Th. II—Abd. VI. Tergal pseudopores 1, 1/ 1, 1, 1, 1, 0, 0 from Th. II to Abd. VI near body axis. Each tibiotarsus with distal whorl of 11 chaetae, ventral 6 as ordinary chaetae, dorsal 5 modified as a central clavate tenent hair, a pair of short accessory chaetae and a pair of slender guard chaetae. Dens basally without outer strong chaetae as Plutomurus or inner large differentiated scales as Pogonognathellus . Dental spines compound, with numerous secondary denticles on surface. Dens dorsally with ordinary chaetae and plumose chaetae, ventrally with dense scales and several apical chaetae. Mucro elongated, bearing numerous chaetae with elongated sockets (not shown in figures); apical tooth subequal to or slightly longer than subapical tooth; two dorsal lamellae running from proximal edges of subapical tooth, outer lamella ending in distal edge of inner basal tooth, inner lamella ending freely at base of mucro, intermediate teeth located on outer lamella; both basal teeth with proximal lamellae, outer basal tooth with toothlet.