Thienemanniella medialis Sublette & Sasa

Wiedenbrug, Sofia, Lamas, Carlos E. & Trivinho-Strixino, Susana, 2013, A review of Neotropical species in Thienemanniella Kieffer (Diptera, Chironomidae), Zootaxa 3670 (2), pp. 215-237 : 220-221

Thienemanniella medialis Sublette & Sasa

( Fig. 3 )

Thienemanniella medialis Sublette & Sasa, 1994: 1 pharate male, 1 female. Type locality Guatemala.

Material examined. Holotype pharate male with pupal exuviae, described by Sublette and Sasa (1994) as “Rincon, leaf litter at small waterfall C, no. I-100” on a single slide with two pupal exuviae of Onconeura semifimbriata , and one male and one female of Corynoneura spp. (not C. ferelobata , see Wiedenbrug et al. 2012). According to Sublette and Sasa (1994, page 28) the allotype of T. medialis is on slide number I-3, specimen number 4, together with the holotype, allotype and paratypes of C. hirvenojai . However, the slide with the holotype of C. hirvenojai Sublette & Sasa is number I-43 and has only one specimen. Sublette and Sasa (1994, page 12) mention that slide number I-39 holds several specimens, including the holotype, allotype and paratypes of C. ferelobata Sublette & Sasa , and that specimen number 4 is the allotype of T. medialis . We have examined this specimen, but since there is no corresponding pupa, that female should be considered as merely tentatively associated only.

Diagnostic characters. Male antenna with 9 flagellomeres; pupa with tergal conjunctive III/IV carrying strong hooklets; segments III-VIII with 3 taeniate lateral setae; L2 longer and broader than L1 and L3; anal lobe with fringe reduced to about 10 taeniate setae shorter than the anal macrosetae.

Additions to previous description. Male (n = 1). Head. According to Sublette and Sasa (1994) the antenna has 10 flagellomeres, but we find the terminal two to be incompletely divided, thus count only 9 flagellomeres.

Legs. Dorsal keel of fore leg trochanter resembles that in T. sancticaroli sp. n. (see Fig. 5 A).

Tergites. TI with 4 setae; TII-III impossible to observe; TIV-VI with 3; TVII-VIII with 2 setae. Sternites III- VIII with one seta

Hypopygium. ( Fig. 3 A) Laterosternite with 1 seta. Superior volsella difficult to define due to bad condition of pharate material. Sternapodeme and phallapodeme as figured.

Pupa (n = 1). Abdomen ( Fig. 5 B–C). TI-II apparently with few posterior shagreen points; TIII-IX with homogeneous shagreen of elongated spinules. Sternites III-VIII with sparse shagreen of short points. Segments III- VIII with 3 taeniate L-setae; L2 broader and longer than the other two. Anal lobe rounded ( Fig. 3 C), with incomplete fringe of setae shorter than macrosetae and 3 cylindrical, apically hooked macrosetae on strong bases; medial setae taeniate and short.

For measurements, see Table 3 .

Remarks. Fu et al. (2010b) included T. medialis in their key, and accordingly the inferior volsella is present and the superior volsella partly fused with the gonocoxite. More material is necessary to better define the hypopygium of this species.

A very similar pupal exuviae was found in Peru, deposited in the ZSM as Thienemanniella sp. A2, sample P18, leg. E.J. Fittkau.

Figures

FIGURE 3. Thienemanniella medialis Sublette & Sasa. A. Adult male, hypopygium. B – C. Pupa. B. Tergites III – IV. C. Tergites VIII – IX, anal lobes.

FIGURE 5. Thienemanniella sancticaroli sp. n., adult male. A. Fore trochanter. B. Hind trochanter. C – D. Apex of hind tibia in posterior (C) and anterior view (D). E. Wing. F – G. Hypopygium. F. Tergite IX (part) and gonostylus. G. Tergite IX and gonostyli removed, internal sclerites hatched; left: ventral view, right: dorsal view.