Chironomid Exchange Forum

Yes surely; unfortunately the wings are not in good condition so it is not clear if Cu brings setae; median volsella lamellae are also difficult to analyze, but I cannot exclude that they are branched; body colour is very light suggesting T. heusdensis, because T. reei is described with darker vittae, only the enlarged digitus suggests T. reei; Molgora is a stream in lowland, the habitat is also compatible with T. heusdensis.
My conclusion is that the species is T.heusdensis, the presence of T.reei in Italy at present is not supported.

Not exactly as Bruno wrote. The structure of tibial cobms and spurs is rather weak character for separation the two genera - combs can be slightly separated and armed with a short spur in both Tanytarsus and Paratanytarsus.
Besides, I was able to see hypopygium only. The presence of spinulae (absent in Paratanytarsus) is the best key character in this case. The species fits the concept of the heusdensis group and should be compared with T. reei.

Looks similar to Tanytarsus reei Na et Bae, 2010 (Tanytarsus heusdensis group)

An important addition; I overlooked tibial combs, they are clearly separated, this character suggests Tanytarsus not Paratanytarsus as genus; I thanks Wojciech Gilka for the having put me on the advice

Yes Molgora is a stream running at East of Milano;
I suspected some similarity with P. corsicanus (publ. in Fauna Norvegica) but anal point in dorsal aspect seems different, and I have not the lateral aspect; digitus seems also different, only median volsella is similar

Dear Bruno,

In order to narrow down the range of references that may have to be consulted: Do I gather correctly that the source for your material is the Torrente Molgora, a (?fast-)running water East of Milano?

Best,

Martin Spies

2023

Bendt, T., Schiffels, S. (2023) Taxonomie für die Praxis. Bestimmungshilfen – Makrozoobenthos (4). Chironomidenlarven. Band 3 – Orthocladiinae. LANUV-Arbeitsblatt 50, Landesamt für Natur, Umwelt und Verbraucherschutz Nordrhein-Westfalen, Recklinghausen; 436 pp. [may be ordered via: https://www.lanuv.nrw.de/landesamt/veroeffentlichungen/publikationen/arbeitsblaetter; see also vol. 1 (Schiffels et al. 2021) and vol. 2 (Bendt & Schiffels 2022)]

Dantas, G. P. S., Siri, A., Hamada, N. (2023) A new species of Macropelopia Thienemann, 1916 (Diptera: Chironomidae) from southern Brazil. Zootaxa 5306(5): 551-562. [publd 23 June 2023]

Donato, M., Arpellino, J. P. Z., Siri, A. (2023) Revision of the species described in Metriocnemus van der Wulp (Diptera: Chironomidae) by Edwards (1931), with the description of two new species. J. nat. Hist. 57(13-16): 904-923. [publd online 21.vi.2023]

Ghaderi, E., Ibrahimi, H., Mohammadi, H., Namayandeh, A. (2023) Chironomidae (Diptera) of Shalmash Falls, West Azerbaijan, Iran, with the description of Paracricotopus davoodi sp. nov., a new Orthocladiinae. Zootaxa 5285(2): 381-388. [publd 16.v.2023]

Langton, P. H. (2023) A key to pupal exuviae of Nearctic Chironomidae based on the collections of William P. Coffman. Published by the author. Coleraine, Northern Ireland; [4] + 9 + 478 pp. [publd 20.ii.2023. ISBN 978-1-3999-4749-7]

Lencioni, V., Adler, P. H., Courtney, G. W. (2023) Order Diptera. Pp. 503-535 in: Maasri, A., Thorp, J. H. (eds), Identification and ecology of freshwater arthropods in the Mediterranean Basin. Elsevier, Amsterdam etc. [publd 27.x.2023. NOTE: subchapters 15.1 to 15.3 have different respective authorship]

Lencioni, V., Moubayed, J., Langton, P. H. (2023) [Chapter 15.2] Family Chironomidae. Pp. 553-602 in: Maasri, A., Thorp, J. H. (eds), Identification and ecology of freshwater arthropods in the Mediterranean Basin. Elsevier, Amsterdam etc. [publd 27.x.2023]

Liu, W.-B., Wang, Y., Zhao, K.-Zh., Wang, Ch.-Y., Zhang, J.-Y., Yan, Ch.-C, Lin, X.-L. (2023) New species, a new combination, and DNA barcodes of Parachironomus Lenz, 1921 (Diptera, Chironomidae). Zootaxa 5256(2): 121-140. [publd 16.iii.2023]

Makarchenko, E. A., Yavorskaya, N. M. (2023) Correction of mistakes. II. New taxonomic position of Chaetocladius (Amblycladius) amurensis Makarchenko et Makarchenko (Diptera: Chironomidae: Orthocladiinae) from the Russian Far East, with redescription of species. Zootaxa 5361(3): 444-448. [publd 2.xi.2023]

Moubayed, J., Mary, N. (2023a) On the genus Smittia Holmgren, 1869 from New Caledonia. I. Description of S. maryae sp. n. from riparian habitats located in the down basin of the River Coulée [Diptera, Chironomidae, Orthocladiinae]. (Sur le genre Smittia Holmgren, 1869 de Nouvelle-Calédonie. I. Description de S. maryae sp. n. d'habitats ripicoles du cours inférieur de la rivière Coulée [Diptera, Chironomidae, Orthocladiinae]). Ephemera 24(1): 23-30. [in English, with French abstract]

Moubayed, J., Mary, N. (2023c) On the genus Thienemanniella Kieffer, 1911 from New Caledonia. I. Description of T. neocaledonica, T. noumeana and T. sarrameana spp. n. [Diptera, Chironomidae, Orthocladiinae]. (Sur le genre Thienemanniella Kieffer, 1911 de Nouvelle-Calédonie. I. Description de T. neocaledonica, T. noumeana et T. sarrameana spp. n. [Diptera, Chironomidae, Orthocladiinae]. Ephemera 24(1): 39-53. [in English, with French abstract]

Mukherjee, B., Hazra, N. (2023) Taxonomic studies on Harnischia complex from India (Diptera: Chironomidae). Zootaxa 5278(2): 239-263. [publd 5.v.2023]

Mukherjee, B., Hui, P., Hazra, N. (2023) Two new species of the genus Paracladopelma Harnisch of Harnischia complex from India (Diptera: Chironomidae). Oriental Insects: 13 pp. [publd online 5.ii.2023]

Orel, O. V. (2023) Stempellinella Brundin, 1947 (Diptera: Chironomidae) from eastern Siberia and the Russian Far East, with the description of new species. Zootaxa 5380(4): 341-360. [publd 1.xii.2023]

Pinho, L. C., Andersen, T. (2023) The immature stages and female imago of Rheocricotopus (Psilocricotopus) sirventorum Andersen & Mendes, 2012, a Neotropical member of the chalybeatus species group (Diptera, Chironomidae, Orthocladiinae). Zootaxa 5375(4): 595-600. [publd 24.xi.2023]

Song, Ch., Wang, L., Lei, T., Qi, X. (2023) New color-patterned species of Microtendipes Kieffer, 1913 (Diptera: Chironomidae) and a deep intraspecific divergence of species by DNA barcodes. Insects [Basle] 14(3, paper 227): 27 pp. + online suppl. material. [publd online 24.ii.2023]

The species has a characteristic anal point a short median volsella and a superior volsella with a large digitus, can somebody help me in identification ?

Dear Bruno,

In my opinion you are right that the name Chironomus nuditarsis is nomenclaturally available from the Keyl (1961) work you refer to. The material had been generated by Strenzke, who apparently never got around to describing the species morphologically. However, in

Klötzli, A. M. (1974) Revision der Gattung Chironomus Meig. V. Chironomus nuditarsis Keyl. Morphologische Beschreibung und Vergleich mit ähnlichen Arten. Archiv Hydrobiol. 74(1): 68-81. [publd "August 1974"; in German, with English abstract]

the author reported on page 69 that Keyl had 'courteously made available for our morphological work the nuditarsis material collected by Strenzke'.

Thus, for morphology I would (first) consult Klötzli's work, even if some morphological data may be found in earlier publications. The publication sequence of morphological treatments of the species is nomenclaturally irrelevant, as the species name is available from Keyl (1961).

For all such cases involving names in Chironomus, please recall - among possible others - the following two highly useful sources of information.

Lindeberg, B., Wiederholm, T. (1979) Notes on the taxonomy of European species of Chironomus (Diptera: Chironomidae). In: Sæther, O. A. (ed.): Recent developments in chironomid studies (Diptera: Chironomidae). Ent. scand. Suppl. 10: 99-116.

Dr. Jon Martin's highly helpful webpages, e.g. https://www.chironomidae.net/Martin/JMRes.html, in the present case especially https://www.chironomidae.net/Martin/Chironfiles/Names.htm

Best regards,

Martin Spies (SNSB-ZSM, Munich)

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