Hendrik Freitag

Hendrik Freitag, German entomologist

• Ateneo de Manila University, Department of Biology, Biodiversity Laboratory, Loyola Heights, Quezon City 1108, , Philippines.
• E-mail: hfreitag@ateneo.edu

(List may be incomplete)

• 60 taxon names authored by Hendrik Freitag

(List may be incomplete)

• Lee, C.-F., Freitag, H. & Jäch, M.A. 2005. Water Penny beetles of Palawan, Philippines, with descriptions of two new species and one new subspecies (Coleoptera: Psephenidae). Aquatic Insects 27(3): 179–191. DOI: 10.1080/01650420500294161 .

• Freitag, H. & Jäch, M.A. 2007. Revision of the species of Hydraena Kugelann (Coleoptera: Hydraenidae) from Palawan and Busuanga, with descriptions of eleven new species, and redescription of Hydraena (Hydraenopsis) scabra d’Orchymont, 1925. Zootaxa 1431: 1–44. Abstract & excerpt. . Reference page. 

• Braasch, D. Freitag, H. 2008. Palawaneuria, a new subgenus of Compsoneuria and new species of Compsoneuria and Afronurus (Ephemeroptera, Heptageniidae) from Palawan, Philippines. Deutsche Entomologische Zeitschrift 55(1): 117–128. DOI: 10.1002/mmnd.200800009 Reference page. 

• Freitag, H. & Balke, M. 2011. Larvae and a new species of Ancyronyx Erichson, 1847 (Insecta, Coleoptera, Elmidae) from Palawan, Philippines, using DNA sequences for the assignment of the developmental stages. ZooKeys 136: 47–82. DOI: 10.3897/zookeys.136.1914 . Reference page. 

• Freitag, H. 2012: Ancyronyx jaechi sp.n. from Sri Lanka, the first record of the genus Ancyronyx Erichson, 1847 (Insecta: Coleoptera: Elmidae) from the Indian Subcontinent, and a world checklist of species. Zootaxa 3382: 59–65. Preview. . Reference page. 
• Zettel, H., Lane, D.J.W., Pangantihon, C.V. & Freitag, H. 2012. Notes on Notonectidae (Hemiptera: Heteroptera) from southeastern Asia, mostly from Brunei and the Philippines. Acta Entomologica Musei Nationalis Pragae 52(1): 29–48. PDF Reference page. 

• Komarek, A. & Freitag, H. 2014: Revision of Anacaena THOMSON, 1859 XI. Republic of the Philippines (Coleoptera: Hydrophilidae). Koleopterologische rundschau 84: 235–276. Full article (PDF) on ResearchGate Reference page. 

• Manuel-Santos, M., Ng, P.K.L. & Freitag, H. 2016. Two new species of Geosesarma De Man, 1892 (Crustacea: Brachyura: Sesarmidae) from Palawan, the Philippines. Raffles Bulletin of Zoology 64: 335-342. PDF. ResearchGate Reference page. 

• Freitag, H. & Kodada, J. 2017. Larvae of Ancyronyx Erichson, 1847 (Insecta: Coleoptera: Elmidae) from Sulawesi, using DNA sequences for the assignment of the larval stages. Zootaxa 4299(1): 121–130. DOI: 10.11646/zootaxa.4299.1.6. Reference page. 
• Freitag, H. & Kodada, J. 2017a. A taxonomic review of the genus Ancyronyx Erichson, 1847 from Sulawesi (Insecta: Coleoptera: Elmidae). Journal of Natural History 51(9-10): 561–606. DOI: 10.1080/00222933.2017.1285447. . Reference page. 
• Kodada, J., Sangpradub, N., Somnark, R., Gruľa, D., Žiak, D. & Freitag, H. 2017. Vietelmis jablonskii, a new species of riffle beetle from Laos and Thailand and new faunistic records on Vietelmis Delève, 1968 from Malaysia (Coleoptera: Elmidae). Zootaxa 4268(1): 131–140. DOI: 10.11646/zootaxa.4268.1.8. Reference page. 
• Vidal, A.R., Go, K.C.T.S. & Freitag, H. 2017. Hydraenidae (Insecta: Coleoptera) of Mindoro, Philippines. I: Hydraena Kugelann, 1794 of the Baroc River basin, Roxas, Oriental Mindoro with description of three new species. Aquatic Insects 38(1-2): 1-20. DOI: 10.1080/01650424.2017.1303517. . Reference page. 

• Freitag, H., Pangantihon, C.V. & Njunjić, I. 2018. Three new species of Grouvellinus Champion, 1923 from Maliau Basin, Sabah, Borneo, discovered by citizen scientists during the first Taxon Expedition (Insecta, Coleoptera, Elmidae). ZooKeys 754: 1–21. DOI: 10.3897/zookeys.754.24276. Reference page. 
• Garces, J.M., Bauernfeind, E. & Freitag, H. 2018. Sparsorythus sescarorum, new species from Mindoro, Philippines (Ephemeroptera, Tricorythidae). ZooKeys 795: 13–30. DOI: 10.3897/zookeys.795.28412 Reference page. 

• Delocado, E.D. & Freitag, H. 2021. Two new species of Byrrhinus Motschulsky, 1858 (Coleoptera, Limnichidae, Limnichinae) from Negros, Philippines. Zookeys 1070ː 51–72. DOI: 10.3897/zookeys.1070.70531 Reference page. 
• Garces, J.M., Sartori, M. & Freitag, H. 2020. Integrative taxonomy of the genus Dudgeodes Sartori, 2008 (Insecta, Ephemeroptera, Teloganodidae) from the Philippines with description of new species and supplementary descriptions of Southeast Asian species. Zookeys, 910: 93–129. DOI: 10.3897/zookeys.910.48659 Reference page. 
• Kodada, J., Jäch, M.A., Freitag, H., Čiamporová-Zaťovičová, Z., Goffová, K., Selnekovič, D. & Čiampor Jr, F. 2020. Ancyronyx clisteri, a new spider riffle beetle species from Borneo, redescription of A. sarawacensis Jäch including a description of the larva and new distribution data for A. procerus Jäch using DNA barcodes (Coleoptera, Elmidae). ZooKeys 912: 25-64. DOI: 10.3897/zookeys.912.47796 Reference page. 
• Kodada, J., Jäch, M.A., Freitag, H., Čiamporová-Zaťovičová, Z., Goffová, K., Selnekovič, D. & Čiampor, F. Jr. 2020. Ancyronyx lianlabangorum sp. nov., a new spider riffle beetle from Sarawak, and new distribution records for A. pulcherrimus Kodada, Jäch & Čiampor based on DNA barcodes (Coleoptera, Elmidae). ZooKeys, 1003: 31–55. DOI: 10.3897/zookeys.1003.55541 Reference page. 
• Komarek, A. & Freitag, H. 2020. Taxonomic revision of Agraphydrus RÉGIMBART, 1903 V. Philippine species and their first DNA barcodes (Coleoptera: Hydrophilidae: Acidocerinae). Koleopterologische Rundschau 90: 201–242. Full article (PDF). Reference page. 
• Pelingen, A.L. & Freitag, H. 2020. Description of Neoperla mindoroensis sp. nov., the first record of a stonefly from Mindoro, Philippines (Plecoptera, Perlidae), and identification of its life stages using COI barcodes. ZooKeys, 954: 47–63. DOI: 10.3897/zookeys.954.53746 Reference page. 

• Frietag, H., de Vries, R., Paterno, M., Maestri, S., Delledonne, M., Thompson, C.G., Lamed, H., Lambert, R., Fox, M.F., Gonzalez, M.C., Delocado, E.D., Sabordo, M.R., Pangantihon, C.V. & Njunjić, I. 2021. Hydraena (s.str.) dinarica, new species (Coleoptera: Hydraenidae) along with further records of Hydraena spp. from Durmitor National Park, Montenegro and comments on the DNA barcoding problem with the genus. Biodiversity Data Journal 9: DOI: 10.3897/BDJ.9.e59892. . Reference page. 
• Freitag, H. & Hornyák, M. 2021. Additional records and new species of Hydraena Kugelann, 1794 (Insecta: Coleoptera: Hydraenidae) from Balabac and Palawan, Philippines. Tijdschrift voor Entomologie 164(1-3): 1–24. Reference page. 

• Sanchez, E.G.S., Delocado, E.D. & Freitag, H. 2022. Two new species of Anacaena Thomson, 1859 (Coleoptera, Hydrophilidae) from Northern Luzon, Philippines. Zookeys, 1112ː 11–25. DOI: 10.3897/zookeys.1112.85752 Reference page. 

• Seno, C.B.N. & Freitag, H. 2023. Ancyronyx jhoanae sp. nov. (Coleoptera: Elmidae), A New Spider Riffle Beetle Species from Luzon, Philippines, and New Records for A. tamaraw Freitag, 2013. Taxonomy 3(1): 85–94. DOI: 10.3390/taxonomy3010008 . Reference page.