Pseudodiamesa nivosa, Goetgehebuer, 1928

Chamutiová, Tímea, Hamerlík, Ladislav & Bitušík, Peter, 2020, Subfossil chironomids (Diptera, Chironomidae) of lakes in the Tatra Mountains an illustrated guide, Zootaxa 4819 (2), pp. 216-264 : 223

publication ID	https://doi.org/10.11646/zootaxa.4819.2.2
publication LSID	lsid:zoobank.org:pub:2459A542-6CF2-4545-9E6F-262C68838D99
DOI	https://doi.org/10.5281/zenodo.4442623
persistent identifier	https://treatment.plazi.org/id/03F487F1-FFBA-FFA3-FF22-FA63AF1CF81C
treatment provided by	Plazi (2020-12-29 00:20:21, last updated 2024-11-25 23:27:53)
scientific name	Pseudodiamesa nivosa
status

Treatment

Pseudodiamesa nivosa View in CoL - type ( Figs 17–19 View FIGURES 15–22 )

This is a new morphotype, not listed in Brooks et al. (2007).

Antennal ratio ≥ 2.5 ( Fig. 17A View FIGURES 15–22 ). Pecten epipharyngis is characterized by even number (3–4 pairs) strongly sclerotized scales. Labral lamellae present between bases of SI setae. Premandible with more than 10 teeth ( Fig. 19 View FIGURES 15–22 ). Mandibular seta interna consists of 14–24 branches ( Fig. 18 View FIGURES 15–22 ).

Mentum with a lighter median tooth compared to the black lateral teeth; outermost lateral teeth are more visible in unflatten mentum ( Fig. 17 View FIGURES 15–22 ). However, be aware of the fact that first and second instar larvae of both morphotypes has broad median mental tooth that is lighter than the blackish lateral teeth ( Figs 20, 21 View FIGURES 15–22 ), thus young instars are not sufficient for morphotype identification.

Remarks: This morphotype was the most frequent Diamesinae remain in surface sediments of the Tatra Mts. lakes. Its distribution is consistent with the knowledge of the ecology of the nivosa species group. It is more coldadapted than the P. branickii group, which occurs under more moderate conditions ( Ilyashuk et al. 2010; Hamerlík et al. 2017). One species of the species group, P. nivosa Goetgehebuer, 1928 , was recorded in the Tatra Mts. ( Novikmec et al. 2015).

References

Brooks, S. J., Langdon, P. G. & Heiri, O. (2007) The Identification and Use of Palaearctic Chironomidae Larvae in Palaeoecology. QRA Technical Guide No. 10. QRA, London, 276 pp.

Hamerlik, L., Svitok, M., Novikmec, M., Veselska, M. & Bitusik, P. (2017) Weak altitudinal pattern of overall chironomid richness is a result of contrasting trends of subfamilies in high-altitude ponds. Hydrobiologia, 793 (1), 67 - 81. https: // doi. org / 10.1007 / s 10750 - 016 - 2992 - 3

Ilyashuk, B. P., Ilyashuk, E. A., Makarchenko, E. A. & Heiri, O. (2010) Midges of the genus Pseudodiamesa Goetghebuer (Diptera, Chironomidae): current knowledge and palaeoecological perspective. Journal of Paleolimnology, 44 (2), 667 - 676. https: // doi. org / 10.1007 / s 10933 - 010 - 9446 - 0

Novikmec, M., Veselska, M., Bitusik, P., Hamerlik, L., Matusova, Z., Klementova, B. R. & Svitok, M. (2015) Checklist of ben- thic macroinvertebrates of high altitude ponds of the Tatra Mountains (Central Europe) with new records of two species for Slovakia. Check List, 11 (1), 1522. https: // doi. org / 10.15560 / 11.1.1522

Figures

FIGURES 15–22. Pseudodiamesa branickii-type: 15— mandible (arrow indicates branches of seta interna). P. branickii-type: 16—detail of pecten epipharyngis and premandible (arrows indicate seven scales of pecten epipharyngis and 8–9 teeth of the premandible). Pseudodiamesa nivosa-type: 17—head capsule, A—antenna. P. nivosa-type: 18—mandible (arrow indicates branches of seta interna). P. nivosa-type: 19—detail of pecten epipharyngis and premandible (arrows indicate premandible teeth, SI setae and detail of labral lamellae). Pseudodiamesa: 20—young instar head capsule. Pseudodiamesa: 21—detail of mentum. Pseudokiefferiella parva: 22—head capsule.