Journal ArticleMicrocaddisflies (Trichoptera, Hydroptilidae) of the Baja California peninsula, Mexico: checklist and description of two new speciesRamírez-Carmona, Mauricio [University of Minnesota, St. Paul, United States of America] (ORCID:0009000612165947); Barba-Alvarez, Rafael [Universidad Nacional Autónoma de México, Ciudad de México, Mexico] (ORCID:0000000300496862); Contreras-Ramos, Atilano [Universidad Nacional Autónoma de México, Ciudad de México, Mexico] (ORCID:0000000180441348); Thomson, Robin E [University of Minnesota, St. Paul, United States of America] (ORCID:0000000258832040)<p>Two new species of Hydroptilidae,<italic>Neotrichia baja</italic><bold>sp. nov.</bold>and<italic>Ochrotrichia rivasi</italic><bold>sp. nov.</bold>, are described from the Baja California peninsula, Mexico. New country records for Mexico of four species are provided:<italic>Leucotrichia mutica</italic>Flint, 1991,<italic>Neotrichia kimi</italic>Keth, 2015,<italic>Neotrichia sepulga</italic>Harris, 1991, and<italic>Ochrotrichia lucia</italic>Denning & Blickle, 1972. In this study, 16 Hydroptilidae species were recorded in the peninsula, and nine were new records for the Baja California and Baja California Sur states. This study represents the first microcaddisfly (Hydroptilidae) diversity assessment of the Baja California peninsula.</p>Proceedings of the 18th International Symposium on Trichoptera2025-12-1010666288ZooKeys1263379 to 3881313-2989https://doi.org/10.3897/zookeys.1263.1480862143776National Science Foundation