Gnaptorina brucei Blair, 1923

Ji, Bao-Yue, Guo, Tong-Yang, Gu, Mei-Chang, Ren, Guo-Dong & Li, Xiu-Min, 2024, Description of five larvae of the genus Gnaptorina Reitter, 1887 from Xizang, China (Coleoptera, Tenebrionidae, Blaptinae), with molecular species delimitation and diagnoses, ZooKeys 1209, pp. 295-314 : 295-314

Gnaptorina brucei Blair, 1923

Examined materials.

Larvae. 2 exx. ( MHBU): Rongxar Township , Tingri County, Xizang / 28 ° 10.92 ′ N, 86 ° 29.25 ′ E / Alt. 4820 m / 2014 - VII- 28 / Guo-Dong Ren, Xing-Long Bai, Jun-Sheng Shan leg.

Description.

Body (Fig. 5 A – C ). Larvae length 24.5–25.5 mm, width 2.2–2.5 mm, comparatively thin. Body yellowish brown, shiny, body wall ossified; median line obvious on thorax dorsally and abdominal tergite I.

Head (Fig. 5 B, D – H ). Labrum transverse; apical part with six setae; anterior margin with two discal and six slender lateral marginal setae; epipharynx with sparse setae on lateral margin, with two basal spines on central area, between the basal spines with four mastoids, with six mastoids above the basal spines (Fig. 5 H ); mandible left-right unsymmetrical, membranous elevation with two setae (Fig. 5 D, E ). Epicranial stem Y-shaped; frons convex, frons with densely long setae on lateral margins, with four pairs of setae at apex (a pair on anterior margin, a pair on mid-anterior margin, two pairs on mid-posterior margin) (Fig. 5 D ). Ocelli inconspicuous (Fig. 5 B ). Maxillary palpi (Fig. 5 E ) three-segmented, cylindrical, and conical at apex; I widest, II longest. Labial palps two-segmented, short; II conical; prementum with two setae on anterior margin, apex with two long setae, lateral sides with four long setae; mentum convex, hexagonal; mentum more slender than prementum, lateral margin with five or six long setae, posterior margin with one long setae; submentum with eight setae on posterior margin. Antennae three-segmented, cylindrical at apex; I longest and widest; III shortest and narrowest.

Thorax (Fig. 5 A ). Each thoracic tergum with two pairs of elongate setae on anterior and posterior margin. Anterior and posterior borders of pronotum with brown longitudinal stripes; posterior border of mesonotum and metanotum with a brown longitudinal stripe. Pronotum longest, 1.70 × as long as mesonotum, 1.45 × as long as metanotum, mesonotum shortest.

Legs (Fig. 5 I ). Protarsungulus with a strong, long seta on inner side and a strong, short spine on outer side at base. Profemora and protibiae gradually narrowing towards apex; inner margin setal formula of prothoracic leg 5 (3): 6–7 (4): 2 (2); outer margin of tibiae with one short seta and one strong, short spine; outer margin of femora with two setae; trochanter with three setae. Mesotarsus with a strong, long seta on inner side and a strong, short spine on outer side at base; inner margin setal formula of mesothoracic leg 3 (3): 5 (3): 2 (2); outer margin of tibiae with two spines; outer margin of femora with two spines; outer margin of trochanters with one spine and two setae. Metatarsus with a strong, long seta on inner side and a strong, short spine on outer side at base; inner margin setal formula of metathoracic leg 3 (2): 5–6 (3): 2 (2), outer margin of tibiae with two spines, outer margin of femora with two spines, outer margin of trochanters with one spine and two setae.

Abdomen (Fig. 5 A, C ). Constricted between VIII and IX segments. Approximately 3.54 × as long as thorax; abdominal segments I – VIII subcylindrical, with transverses plicae; ventral side of abdominal segment I with sparse setae on anterior and lateral margins, with two setae on posterior margin; ventral side of abdominal segments II – VIII with two pairs of setae on lateral margin. Last segment conical, 0.79 × as long as VIII, distinctly narrower than VIII; last segment surface of convex disc with sparse long setae in ventral view, with a row of short spines on each side (four spines on left, six spines on right); urogomphi inconspicuous and upturned slightly, with two short spines (Fig. 5 J – L ).

Spiracles (Fig. 5 C ). Lateral margins of abdominal segments I – VIII and mesothorax each with a pair of oval spiracles, mesothoracic spiracles largest, abdominal segments I – VIII spiracles gradually shrinking.

Figures

Figure 5. Larva of Gnaptorina brucei Blair, 1923 A habitus, dorsal view B habitus, lateral view C habitus, ventral view D head, dorsal view E head, ventral view F, G head, vertex view H epipharynx I legs J pygopods, dorsal view K pygopods, ventral view L pygopods, lateral view. Scale bars: 2 mm (A – C); 1 mm (D – G, I – L); 0.5 mm (H).