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Issue: Vol. 5793 No. 2: 16 Apr. 2026
Type: Article
Published: 2026-04-16
DOI: 10.11646/zootaxa.5793.2.2
Page range: 345-391
Abstract views: 91
PDF downloaded: 3

Sixteen new orthoclads (Chironomidae: Diptera) and new faunistic records from a patch of cloud forest in Zurquí de Moravia, Costa Rica

Department of Environmental and Life Sciences; Trent University; 1600 West Bank Drive; Peterborough; ON; Canada.
Diptera ZADBI Costa Rica DipteraChironomidae Orthocladiinae New Species

Abstract

This study is part of the Zurquí All Diptera Biodiversity Inventory, an effort to estimate the richness of the megadiverse order Diptera from Costa Rica. In this study, 16 new Orthocladiinae (Chironomidae) species are described. Bryophaenocladius borkenti sp. nov., Bryophaenocladius browni sp. nov., Bryophaenocladius epleri sp. nov., Bryophaenocladius porrasae sp. nov., Bryophaenocladius ulateae sp. nov., and Bryophaenocladius zumbadoi sp. nov., are distinguished by a well-reduced anal point and gonostylus with a dorsobasal ridge. Colosmittia elviae sp. nov. has a gonostylus with a trifid mega seta. Ionthosmittia lepizae sp. nov., a new faunistic record for the Neotropics, is distinguished from its congeners by the contrasting coloration of its tergites, low antennal ratio, and shape of its anal point and inferior volsella. Metriocnemus hernandezae sp. nov. is characterised by a virga with three compacted spines surrounded by a hyaline lamella on both sides, a long gonostylus with a slightly expanded apex, and a developed crista dorsalis, stretching over the anterior 1/3rd of the gonostylus. Metriocnemus picadoae sp. nov. is characterised by an inferior volsella posteriorly located and expanded on the gonocoxite. Parametriocnemus avilae sp. nov., Parametriocnemus lizanoi sp. nov., Parametriocnemus moragai sp. nov., and Parametriocnemus viquesi sp. nov. are distinguished from their congeners by a low antennal ratio, eyes with squared dorsomedial extension, and the antennal ultimate flagellomere with numerous long, curved sensilla chaetica, and well-sclerotized aedeagal lobes. Pseudorthocladius (Pseudorthocladius) edrisghaderii sp. nov., a new faunistic record for the Neotropics, is characterized by a circular-shaped anal point with a wide and round apex, covering most of tergite IX, inferior volsella well-reduced and rounded, and gonostylus bearing a large preapical spine and smaller spines on the dorsal surface. Titimbera holdenae sp. nov. is uniquely placed in its genus, and it is distinguished by its gonostylus shape and acrostichals placement on the scutum. Its scalpellate acrostichals and extremely extended costa of the wing place it in Titimbera.

 

References

  1. Andersen, T., Mendes, H.F. & Hagenlund, L.K. (2011) A new species of Colosmittia Andersen et Sæther from Costa Rica (Chironomidae: Orthocladiinae). Biota Neotropica, 11, 211–213. https://doi.org/10.1590/S1676-06032011000300019
  2. Andersen, T., Pinho, L.C. & Mendes, H.F. (2015) Titimbera, a new genus of Orthocladiinae from South and Central America (Diptera: Chironomidae). Studies on Neotropical Fauna and Environment, 50 (2), 96–106. https://doi.org/10.1080/01650521.2015.1050903
  3. Andersen, T. & Sæther, O.A. (1993) Colosmittia clavata gen. n., sp. n., a new orthoclad from the West Usambara Mountains, Tanzania (Diptera: Chironomidae). Journal of the Kansas Entomological Society, 439–443.
  4. Andersen, T. & Sanz-la Parra, A.M. (2023) A new species of Riethia Kieffer, 1917 from Zurquí, Costa Rica (Chironomidae, Chironominae, Pseudochironomini). Norwegian Journal of Entomology, 70 (1), 29–33.
  5. Borkent, A. & Brown, B.V. (2015) How to inventory tropical flies (Diptera)-One of the megadiverse orders of insects. Zootaxa, 3949 (3), 301–322. https://doi.org/10.11646/zootaxa.3949.3.1
  6. Borkent, A., Spinelli, G.R., Diaz, F., Steinke, D., Perez, K.H., Stur, E., Hallwachs, W. & Janzen, D.H. (2024) Looking into the abyss—how many species of biting midges (Diptera: Ceratopogonidae) are there? Their remarkable diversity in Costa Rica and elsewhere. 5555 (3), 331–384. https://doi.org/10.11646/zootaxa.5555.3.3
  7. Borkent, A., Brown, B.V., Adler, P.H., Amorim, D., Barber, K., Bickel, D., Boucher, S., Brooks, S., Burger, J., Burington, Z.L., Capellari, R.S., Costa, D.N.R., Cumming, J., Curler, G., Dick, C.W., Epler, J.H., Fisher, E., Gaimari, S., Gelhaus, J., Grimaldi, D., Hash, J., Hauser, M., Hippa, H., Ibáñez-Bernal, S., Jaschhof, M., Kameneva, E.P., Kerr, P., Korneyev, V., Korytkowski, C.A., Kung, G.-A., Kvifte, G.M., Lonsdale, O., Marshall, S.A., Mathis, W.N., Michelsen, V., Naglis, S., Norrbom, A.L., Paiero, S., Pape, T., Pereira-Colavite, A., Pollet, M., Rochefort, S., Rung, A., Runyon, J.B., Savage, J., Silva, V.C., Sinclair, B.J., Skevington, J.H., Stireman, J.O., Swann, J., Vilkamaa, P., Wheeler, T., Whitworth, T., Wong, M., Wood, D.M., Woodley, N., Yau, T. & Zumbado, M.A. (2018) Remarkable fly (Diptera) diversity in a patch of Costa Rican cloud forest: Why inventory is a vital science. Zootaxa, 4402 (1), 53–90. https://doi.org/10.11646/zootaxa.4402.1.3
  8. Boucher, S., Borkent, A. & Brown, B.V. (2025) The leaf-miner flies (Diptera: Agromyzidae) of Costa Rican cloud forests. Zootaxa, 5633 (2), 251–287. https://doi.org/10.11646/zootaxa.5633.2.3
  9. Brodin, Y., Widmann, C. & Marle, P. (2026) Global view of Parametriocnemus (Diptera, Chironomidae), including species key to the adult males. CHIRONOMUS Journal of Chironomidae Research, 41, 4–25. https://doi.org/10.5324/cjcr.v0i41.6379
  10. Brown, B.V., Borkent, A., Adler, P.H., Amorim, D. de S., Barber, K., Bickel, D., Boucher, S., Brooks, S.E., Burger, J. & Burington, Z.L. (2018) Comprehensive inventory of true flies (Diptera) at a tropical site. Communications biology, 1 (1), 21. https://doi.org/10.1038/s42003-018-0022-x
  11. Cranston, P.S., Oliver, D.R. & Sæther, O.A. (1989) The adult male of Orthocladiinae (Diptera: Chironomidae) of the Holarctic region-Keys and diagnoses. In: Wiederholm, T. (Ed.), Chironomidae of the Holarctic Region Keys and diagnoses. Part 3. Adult Males. Entomologica Scandinavica Supplement. Vol. 34. Societas Entomologica Scandinavica, Lund, pp. 165–352.
  12. Dexter, E., Rollwagen-Bollens, G. & Bollens, S.M. (2018) The trouble with stress: A flexible method for the evaluation of nonmetric multidimensional scaling. Limnology and Oceanography Methods, 16, 434–443. https://doi.org/10.1002/lom3.10257
  13. Donato, M., Mauad, M. & Siri, A. (2024) New species of Bryophaenocladius Thienemann, 1934 (Diptera: Chironomidae) from Argentina. Zootaxa, 5448 (2), 283–291. https://doi.org/10.11646/zootaxa.5448.2.8
  14. Donato, M. & Paggi, A.C. (2005) A new Neotropical species of the genus Metriocnemus van der Wulp (Chironomidae: Orthocladiinae) from Eryngium L. (Apiaceae) phytotelmata. Zootaxa, 1050 (1), 1–14. https://doi.org/10.11646/zootaxa.1050.1.1
  15. Donato, M. & Siri, A. (2010) A new species of Metriocnemus van der Wulp (Diptera: Chironomidae) with a tentative phylogeny of the genus. Neotropical Entomology, 39 (1), 50–60. https://doi.org/10.1590/S1519-566X2010000100008
  16. Donato, M., Zanotto Arpellino, J.P. & 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. Journal of Natural History, 57 (13–16), 904–923. https://doi.org/10.1080/00222933.2023.2215952
  17. Epler, J.H. (2012) A brachypterous Bryophaenocladius (Diptera: Chironomidae: Orthocladiinae) with hypopygium inversum from Heggie’s Rock, Georgia, USA. Zootaxa, 3355 (1), 51–61. https://doi.org/10.11646/zootaxa.3355.1.3
  18. Epler, J.H. (2017) An annotated preliminary list of the Chironomidae (Diptera) of Zurquí, Costa Rica. CHIRONOMUS Journal of Chironomidae Research, 30, 4–18. https://doi.org/10.5324/cjcr.v0i30.2240
  19. Gaimari, S.D. (2025) The Endemic Costa Rican Genus Freyia Malloch (Diptera: Lauxaniidae). Proceedings of the Entomological Society of Washington, 127 (3), 434–457. https://doi.org/10.4289/0013-8797.127.3.434
  20. Grimaldi, D.A. & Richenbacher, C. (2023) Exceptional species diversity of Drosophilidae (Diptera) in a Neotropical forest. American Museum Novitates, 2023 (3997), 1–28. https://doi.org/10.1206/3997.1
  21. Hammer, Ø., Harper, D.A.T. & Ryan, P.D. (2001) PAST 2.17c. Paleontological Statistics Software Package for Education and Data Analysis. Palaeontologia Electronica, 4, 1–9.
  22. Helicon Soft Ltd. (2024) Helicon Focus (Lite, Pro, Premium). Version 8.3.0. (2024). Available from: https://www.heliconsoft.com (accessed 3 March 2026)
  23. Inkscape Project (2022) Inkscape. Version 1.2.2. Available from: https://inkscape.org (accessed 3 March 2026)
  24. Makarchenko, E.A. & Makarchenko, M.A. (2009) New records of chironomids (Diptera, Chironomidae, Orthocladiinae) in Far East and bordering territories. VII. Bryophaenocladius Thienemann. Eurasian Entomological Journal, 8 (Supplement 1), 51–63.
  25. Mendes, H.F. & Andersen, T. (2009) First record of the genus Colosmittia Andersen & Sæther (Chironomidae: Orthocladiinae) from the Neotropical region. Neotropical Entomology, 38, 649–652. https://doi.org/10.1590/S1519-566X2009000500014
  26. Ospina-Torres, R., Riss, W. & Ruiz, J.L. (1999) Guía para la identificatión genérica de larvas de quironomidos (Diptera: Chironomidae: Orthocladiinae) de la Sabana de Bogotá. I. Subfamilia Orthocladiinae. In: Amat-G., G., Andrade-C., M.G. & Fernández, F. (Eds.), Insectos de Colombia II. Academia Colombiana de Ciencias Exactas, Físicas y Naturales [ACCEFYN] in collaboration with the Universidad Nacional de Colombi, Bogotá, D.C., pp. 363–384.
  27. Roback, S.S. & Coffman, W.P. (1983) Results of the Catherwood Bolivian-Peruvian Altiplano Expedition Part II. Aquatic Diptera including Montane Diamesinae and Orthocladiinae (Chironomidae) from Venezuela. In: Proceedings of the Academy of Natural Sciences of Philadelphia. The Academy of Natural Sciences of Philadelphia, Philadelphia, Pennsylvania, pp. 9–79.
  28. Sæther, O.A. (1969) Some Nearctic Podonominae, Diamesinae, and Orthocladiinae (Diptera: Chironomidae). Bulletin of the Fisheries Research Board of Canada, 170, 1–154.
  29. Sæther, O.A. (1981) Orthocladiinae (Diptera: Chironomidae) from the British West Indies, with descriptions of Antillocladius n. gen., Lipurometriocnemus n. gen., Compterosmittia n. gen. and Diplosmittia n. gen. Entomologica Scandinavica Supplement, 16, 1–46.
  30. Sæther, O.A. & Andersen, T. (1995) Ionthosmittia caudiga n. gen. n. sp., a new orthoclad from the Usambara Mts, Tanzania (Diptera Chironomidae). Tropical Zoology, 8 (1), 197–202. https://doi.org/10.1080/03946975.1995.10539279
  31. Sæther, O.A. & Sublette, J.E. (1983) A review of the Genera Doithrix n. gen., Georthocladius Strenzke, Parachaetocladius Wülker and Pseudorthocladius Goetghebuer (Diptera: Chironomidae, Orthocladiinae). Entomologica Scandinavica Supplement, 20, 1–100.
  32. Sasa, M. (1996) Seasonal distribution of the Chironomid species collected with light traps at the side of two lakes in the Toyama City Family Park. In: Some Characters of Water Quality and Aquatic Organism in the Chief Lakes in Toyama Prefecture (Lake Arimine, Kaniichigawa Reservoir). Toyama Prefecture Environmental Science Research Center, Toyama City, Toyama Prefecture, pp. 16–78.
  33. Sasa, M. & Okazawa, T. (1994) Part 2. Additional information on the Chironomidae of the Kokuriku Region. In: Some Characters of Water Quality and Aquatic Organism in the Chief Lakes in Toyama Prefecture (Konadegawa Reservoir). Toyama Prefecture Environmental Science Research Center, Toyama City, Toyama Prefecture, pp. 68–87.
  34. Sublette, J.E. & Sasa, M. (1994) Chironomidae collected in Onchocerciasis endemic areas of Guatemala (Insecta, Diptera). Spixiana Supplement, 20, 1–60.
  35. Trivinho-Strixino, S. (2011) Larvas de Chironomidae. Guia de identificação. Laboratório de Entomologia Aquática, Departamento Hidrobiologia, Universidade Federal de São Carlos, São Carlos, São Paulo, 371 pp.
  36. Wang, X., Andersen, T. & Sæther, O.A. (2006) Neotropical Bryophaenocladius Thienemann, 1934 (Diptera: Chironomidae). Studies on Neotropical Fauna and Environment, 41 (1), 19–32. https://doi.org/10.1080/01650520500228406
  37. Watson, C.N. Jr. & Heyn, M.W. (1993) A preliminary survey of the Chironomidae (Diptera) of Costa Rica, with emphasis on the lotic Fauna. In: Bund, W.J. van de & Kraak, M.H.S. (Eds,), Proceedings of the 11th International Symposium on Chironomidae, Amsterdam, 12–14 August 1991. Netherlands Journal of Aquatic Ecology, 26, pp. 257–262. https://doi.org/10.1007/BF02255249
  38. Widmann, C., Marle, P. & Brodin, Y. (2025) A new species of Parametriocnemus Goetghebuer, 1931 (Diptera: Chironomidae: Orthocladiinae) from Switzerland and elevation of P. stylatus adzharicus Kownacki & Zosidze, 1973 to full species. CHIRONOMUS Journal of Chironomidae Research, 39, 4–12. https://doi.org/10.5324/cjcr.v0i39.6282
  39. Yamamoto, M., Yamamoto, N. & Kimura, M. (2015) Taxonomic notes on Chironomidae (Diptera) from Okinawa Island, Japan, with the description of three new species. European Journal of Environmental Sciences, 5 (1), 101–115. https://doi.org/10.14712/23361964.2015.83

How to Cite

Namayandeh, A. (2026) Sixteen new orthoclads (Chironomidae: Diptera) and new faunistic records from a patch of cloud forest in Zurquí de Moravia, Costa Rica. Zootaxa, 5793 (2), 345–391. https://doi.org/10.11646/zootaxa.5793.2.2