Hydrosmittia sp.

Ferrington Jr, Leonard C. & Saether, Ole A., 2011, A revision of the genera Pseudosmittia Edwards, 1932, Allocladius Kieffer, 1913, and Hydrosmittia gen. n. (Diptera: Chironomidae, Orthocladiinae) 2849, Zootaxa 2849 (1), pp. 1-314 : 140

Hydrosmittia sp. “ Northwest Territories ”

( Fig. 51 )

Material examined: CANADA: Northwest Territories, Martin River , 1 larva, 23.v.1972, Freshwater Institute Pipeline Project, ( CNC) .

Diagnostic characters: This larva differs from all other known members of the Pseudosmittia complex in having no larger claws on the anterior parapods combined with 11 claws on the posterior parapods, mandible with 4 inner teeth and mentum with 4 pairs of lateral teeth.

Fourth instar larva (n = 1)

Total length 6.21 mm. Head capsule length 0.34 mm. Head capsule brownish black.

Head. Antenna as in Fig. 51 A . Length of antennal segments (in µm): 18, 6.5, 3, 2. AR 1.60. Basal antennal segment 34 µm wide, blade 32 µm long, accessory blade 6 µm long, sensilla basiconica 5.5 µm long. Subapical style of second segment 6.5 µm long. Premandible ( Fig. 51 B ) 69 µm long. Mandible ( Fig. 51 C ) 128 µm long, with 4 inner teeth, seta subdentalis 5.5 µm long, seta interna well developed, with 6 blades. Mentum as in Fig. 46 D , with 5 pairs of lateral teeth, median tooth about 18 µm wide. Postmentum 137 µm long.

Abdomen. Anterior parapods fully fused, without longer claws. Posterior parapods with 11 claws, all about 53 µm long.

Remarks.

The species appears not likely to belong to any species described as an adult.

Figures

FIGURE 46. Hydrosmittia ruttneri (Strenzke et Thienemann) comb. n., male. A—wing; B—head; C—third palpomere; D—cibarial pump and stipes; E—virga; F—hypopygium, left dorsal aspect, right ventral aspect.

FIGURE 51. Hydrosmittia sp. “Northwest Territories”, larva. A—antenna; B—premandible; C—mandible; D—mentum.