Cryptotendipes

Yan, Chuncai, Tang, Hongqu & Wang, Xinhua, 2005, A review of the genus Cryptotendipes Lenz (Diptera: Chironomidae) from China, Zootaxa 1086, pp. 1-24 : 15-17

Cryptotendipes sp. 3 ( Fig. 7 A–F)

Larva (only head capsule retained)

Material examined: 1 larva. China: Hebei Province, Chengde City, Kuancheng County, 21.IX.2001, leg. X. Wang.

Fourth­instar larva.

Coloration: Head capsule pale yellow with some teeth brown. Gula deep brown. Posterior occipital margin dark brown.

Antenna ( Fig. 7 A): Total length 55 µm long, 0.55 times as long as mandible. Antennal segment lengths (in µm): 30; 10; 2.5; 4; 2.5. AR = 1.2. Basal segment 12.5 µm wide. Antennal blade 20 µm long, reaching middle of fifth segment, accessory blade 115 µm long, reaching middle of fourth segment. Ring organ located at 0.5 of basal segment, 15 µm long from base. Lauterborn organ absent.

Labrum: Both SI and SII slender, slightly broadened proximally, SI slightly smaller than SII, 0.6–0.7 times of SII in length. SIVA consisting of 2 segments, basal segment 10 µm long, distal segment 5 µm long. Pecten epipharyngis ( Fig. 7 B) with 2 blunt teeth. Premandible with 2 pointed apical teeth, 60 µm long. Premandible brush present. Anterior margin of frontal apotome straight, with S3 located in each corner. SL1 and SL2 present. ( Fig. 7 C)

Mandible ( Fig. 7 D): Total length 100 µm long. Mandible teeth yellowish brown, other areas pale, 2 inner teeth, 1 apical tooth, third false tooth present on mola, apex of teeth somewhat flat. Seta subdentalis blade­like, relatively long, 30 µm long, extending length of inner tooth. Seta interna with 4 branches, most proximal branch apparently bifid, 30 µm long.

Mentum ( Fig. 7 E): Total length 100 µm, 50 µm high. Median teeth notched laterally, trifid, 25 µm wide. Outer 3 lateral teeth grouped into compound tooth, clearly set off from others. Ventromental plate 70 µm wide (w), 30 µm long (l), outer margin rugose. Separation between plates 47.5 µm. VmPR (w/l): 2.33; VmPSR(w/s): 1.47; mentum ratio (VmP/M): 0.70. Striae number 16. Setae submenti simple, distance between setae 65 µm. Postmentum 115 µm long.

Maxillary palp ( Fig. 7 F): Basal part 20 µm long, 15 µm wide, with ring organ 0.38 from base. Distal part with 4 blade­like and 1 two­segmented sensilla.

Remarks: The larva resembles that of C. holsatus described by Lenz (1959), Moller­ Pillot (1984, Netherlands), and Nocentini (1985, Italy). The larva differs from others in the genus by the two­toothed pecten epipharyngis and loosely arranged mental teeth. In the Chinese specimen, SI is a little smaller than SII, SI/SII = 0.6–0.7 in length, similar to the Netherlands specimen described by Moller­Pillot (1984), but not as small as in the original description by Lenz (1959). The pupa, male, and female have not been found in China, so we treat this larva as C. sp. 3.

Figures

FIGURE 7. Cryptotendipes sp. 3. Fourth­instar larva. A. Antenna. B. Pecten epipharyngis. C. Frontal apotome and sclerites. D. Mandible. E. Mentum. F. Maxillary palp.