Labiotermes

Constantino, Reginaldo, Acioli, Agno N. S., Schmidt, Karen, Cuezzo, Carolina, Carvalho, Sérgio H. C. & Vasconcellos, Alexandre, 2006, A taxonomic revision of the Neotropical termite genera Labiotermes Holmgren and Paracornitermes Emerson (Isoptera: Termitidae: Nasutitermitinae), Zootaxa 1340, pp. 1-44 : 7-8

Key to the workers of Labiotermes

Workers of Labiotermes can be readily identified by the presence of a row of short spines on lateral margins of meso­ and metanotum ( Fig. 4 C) and the enlarged abdomen. Identification to species level usually requires examination of the enteric valve armature ( Fig. 16 ).

1. Front coxae rounded, without any projection near base ( Figs. 3 J, 4D, 8J) ................. 2

­ Front coxae with a rounded or conical projection near base ( Figs. 1 G, 7F) ................ 4

2. Enteric valve with 3 large and one small ridge covered with short spines ( Fig. 16 D) ... ....................................................................................................................... L. labralis

­ Enteric valve with 3 or 6 ridges partially covered with dense, long hairs ( Figs 16 C, 16H) ............................................................................................................................. 3

3. Head with very few hairs ( Fig. 3 G); enteric valve with 6 distinct ridges ( Fig. 16 C) ..... ..................................................................................................... L. guasu , new species

­ Head with numerous hairs ( Fig. 8 G); enteric valve with 3 distinct ridges of unequal and 3 vestigial ridges ( Fig. 16 H) .......................................... L. oreadicus , new species

4. Projection on front coxae conical, with a sharp point ( Fig. 1 G) ................................. 5

­ Projection on front coxae without a sharp point ( Fig. 2 O, 6F) ................................... 6

5. Enteric valve with a single ridge covered with very short spines ( Fig. 16 A); width of head 0.95–1.2mm .................................................................................... L. brevilabius

­ Enteric valve with 6 distinct ridges of irregular shape, covered with long, fine and straight spines ( Fig. 16 I); width of head 1.25–1.7mm ....................... L. orthocephalus

6. Head and body densely covered with fine, long hairs ( Fig. 10 ); enteric valve with 6 ridges covered with long and curved spines ( Fig. 16 J) ............................... L. pelliceus

­ Head with numerous short hairs ( Figs. 2 L, 5M); enteric valve with 4–6 ridges covered with straight spines ( Fig. 16 B, E–G) ........................................................................... 7

7. Mandibles with very large apical teeth; left mandible index ca. 1.4; enteric valve with 5 elongate ridges ( Fig. 16 F) ...................................................................... L. leptothrix

­ Left mandible index less than 1.1; enteric valve with 4–6 ridges ............................... 8

8. Front and middle trocanters with small spines; enteric valve with 6 finger­like ridges ( Fig. 16 G) ................................................................................................ L. longilabius

­ Front and middle trocanters without small spines; enteric valve with 4–6 ridges (usually 4) .......................................................................................................................... 9

9. Posterior margin of mesonotum with only a few lateral hairs ( Fig. 2 M); head and postclypeus with sparse hairs ( Fig. 2 L); length of hind tibia 1.2–1.5mm ........ L. emersoni

­ Posterior margin of mesonotum with a line of 8 or more hairs ( Fig. 5 N); head and postclypeus with dense hairs ( Fig. 5 M); length of hind tibia 1.5–1.7mm ... L. laticephalus

Figures

FIGURES 1. Labiotermes brevilabius. Soldier: A, head in dorsal view; B, thorax; C, head in profile. Worker: D, head in dorsal view; E, thorax; F, head in profile; G, right front leg. Scale bars = 1.0 mm.

FIGURES 2. Labiotermes emersoni. Soldier from Minas Gerais: A, head in dorsal view; B, pronotum in dorsal view; C, head in profile; D, pronotum in posterior view; E, right front leg; F, postmentum. Soldier from Rondonia: G, head in profile. Imago: H, head in dorsal view; I, pronotum; J, head in profile; K, antenna. Worker: L, head in dorsal view; M, thorax; N, head in profile; O, right front leg. Scale bars = 1.0 mm.

FIGURES 3. Labiotermes guasu, new species. Soldier: A, head in dorsal view; B, pronotum in dorsal view; C, pronotum in posterior view; D, head in profile; E, postmentum; F, right front leg. Worker: G, head in dorsal view; H, thorax; I, head in profile; J, right front leg. Scale bars = 1.0 mm.

FIGURES 4. Labiotermes labralis. Soldier: A, head in dorsal view; B, head in profile. Worker: C, head in dorsal view; C, thorax; D, head in profile; E, right front leg. Scale bar = 1.0 mm.

FIGURES 5. Labiotermes laticephalus. Large soldier: A, head in dorsal view; B, pronotum in dorsal view; C, pronotum in posterior view; D, postmentum; E, head in profile; F, right front leg. Small soldier: G, head in dorsal view; H, pronotum in dorsal view; I, pronotum in posterior view; J, head in profile; K, postmentum. Worker: L, right front leg; M, head in dorsal view; N, thorax; O,

FIGURES 8. Labiotermes oreadicus, new species. Soldier: A, head in dorsal view; B, pronotum in dorsal view; C, pronotum in posterior view; D, head in profile; E, right front leg; F, postmentum. Worker: G, head in dorsal view; H, thorax; I, head in profile; J, right front leg. Scale bars = 1.0 mm.

FIGURES 10. Labiotermes pelliceus. Soldier: A, head in dorsal view; B, head in profile. Worker: C, head in dorsal view; D, thorax; E, head in profile; F, right front leg. Scale bar = 1.0 mm.

FIGURES 16. Enteric valve armature of workers. A, Labiotermes brevilabius; B, L. emersoni; C, L. guasu, new species; D, L. labralis; E, L. laticephalus; F, L. leptothrix; G, L. longilabius; H, L. oreadicus, new species; I, L. orthocephalus; J, L. pelliceus.