Ocreatomurus Yu, 2023

Subgenus Ocreatomurus Yu, 2023 View in CoL in Yu et al. 2023

Common characters shared by the new species: 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 four papillae ending in curved spines. Mentum with five chaetae, submentum with numerous chaetae. Mandibular head asymmetrical, the left side with four teeth and the right side with five teeth, left molar plate distally with a tapered tooth. Maxillary lamella 5 without beard-like appendage. Maxillary outer lobe with trifurcate palp, one basal chaeta and four sublobal hairs. Both dorsal and ventral sides of Ant. I and Ant. II scaled, Ant. IV unscaled. Cephalic dorsal macrochaetotaxy: anterior area: 2 (A2), 4 (A3, A5); interocular area: 2 (M2), 7 (S0, S2, S5, S6); postocular area: 2+2 (Pa5, Pa6); posterior area: 3+3 (Pa2, Pp3, Pe5).

Macrochaetae densely arranged along anterior margin of Th. II and sparsely on each tergum, most mesochaetae present 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) on Th. II–III/Abd. I–V respectively. Th. II behind anterior marginal macrochaetae cluster with a file of macrochaetae, including a3, a4, and a4ae; central macrochaetae a2, a5, m1, m2 and m3 arranged approximately in triangle, m4 lateral to m2. Th. III with anterior macrochaeta a4; Abd. III with two anterior macrochaetae m3 and m6; Abd. IV with antero-lateral macrochaeta m6. Bothriotricha 2 (a6, m6), 1 (m6)/ 0, 0, 1 (a5), 2 (a2, a5), 0, 0 on Th. II–III/ Abd. I–VI. Tergal pseudopores 1, 1/1, 1, 1, 1, 0, 0 from Th. II–III/Abd. I–VI near body axis.

Trochantero-femoral organ with 1, 1 slender chaetae. Each tibiotarsus with distal whorl of 11 chaetae, among which the six ventral (inner) chaetae as ordinary chaetae, the five dorsal (outer) chaetae modified into a central clavate tenent hair, a pair of short accessory chaetae and a pair of slender guard chaetae. Unguis slender, with basointernal ridges about 1/4–1/3 distant from base; lateral teeth pointed, of moderate size. Inner edge of unguis with basal tooth and 4–6 more distal teeth, sub-basal tooth subequal to others or slightly larger. Unguiculus lanceolate. Rami of tenaculum with 4 + 4 teeth. Manubrium ventrally scaled without chaetae; laterally with large round scales and a row of strong chaetae; dorsally with two longitudinal strips of chaetae, including 2 + 2 pointed prominent chaetae at 1/3–2/5 and 3/4–4/5 the length of manubrium from base, respectively. Inner edge of each dorsal chaetal strip with a narrow strip of scales. Dens basally with a pointed prominent dorsal chaeta, without modified outer strong chaetae of Plutomurus - type or differentiated inner large scales of Pogonognathellus - type. Dental spines compound, with numerous small denticles on surface. Distal end of dental spine array with a single large spine. Dens dorsally with ordinary chaetae and plumose chaetae, ventrally with dense scales and several apical chaetae. Mucro elongated, with numerous chaetae; apical tooth subequal to or slightly larger than subapical tooth; two dorsal lamellae running from proximal edge of subapical tooth, outer lamella ending in distal edge of inner basal tooth, inner lamella ending at the base of mucro, intermediate teeth located on outer lamella; both basal teeth with proximal lamellae, outer basal tooth with a toothlet.