taxonID	type	description	language	source
9DBE04B6C61E5F3384940DB6152EECF2.taxon	description	Fig. 2	en	Ramírez-Carmona, Mauricio, Barba-Alvarez, Rafael, Contreras-Ramos, Atilano, Thomson, Robin E. (2025): Microcaddisflies (Trichoptera, Hydroptilidae) of the Baja California peninsula, Mexico: checklist and description of two new species. ZooKeys 1263: 379-388, DOI: 10.3897/zookeys.1263.148086
9DBE04B6C61E5F3384940DB6152EECF2.taxon	diagnosis	Diagnosis. This species is placed in the canixa group based on the sclerotized horns of segment X, forked bracteoles, and bifid inferior appendages outlined in Keth et al. (2015). This species is most similar to Neotrichia canixa (Mosely, 1937). The phallus is very similar, bearing a long paramere, and ending in two sclerotized hooks (Fig. 2 D, E). However, the anterolateral margin of segment IX is convex (Fig. 2 A), while it is tapered in N. canixa; the apicolateral projection is serrate and digitate (Fig. 2 A, B), while it is setose in N. canixa; and the bracteole is sparsely setose, with only long apical seta in N. canixa. Also, the horns in segment X are wider and thicker than those of N. canixa (Fig. 2 B).	en	Ramírez-Carmona, Mauricio, Barba-Alvarez, Rafael, Contreras-Ramos, Atilano, Thomson, Robin E. (2025): Microcaddisflies (Trichoptera, Hydroptilidae) of the Baja California peninsula, Mexico: checklist and description of two new species. ZooKeys 1263: 379-388, DOI: 10.3897/zookeys.1263.148086
9DBE04B6C61E5F3384940DB6152EECF2.taxon	description	Description. Male. Forewing length 1.7 – 2.1 mm (N = 4). Head unmodified, with 3 ocelli; antennae unmodified. Tibial spur formula 0, 2, 3. Sternum VII and VIII unmodified, annular. Genitalia. Segment IX anterior margin convex, in lateral view, with prominent lateral seta, segment fused dorsally with tergum X; apicolateral projection digitate, serrate; bifid bracteole with upper and lower arms slender and digitate, upper arm sparsely setose with prominent apical seta in ventral view, lower arm sparsely setose with prominent apical seta (Fig. 2 A). Tergum X extended posteriorly, in dorsal view approximately pentagonal with apical emargination; robust sclerotized horns curving mesally (Fig. 2 B). Subgenital plate with hooked apex, dorsally with pair of preapical setae, in lateral view basally membranous (Fig. 2 A, B). Inferior appendage bifid, upper arm setose, lower arm with single apical seta (Fig. 2 C). Phallus tubular with medial constriction, elongate paramere arising from constriction and extending to apex; apex with pair of slightly sclerotized hooks (Fig. 2 D, E).	en	Ramírez-Carmona, Mauricio, Barba-Alvarez, Rafael, Contreras-Ramos, Atilano, Thomson, Robin E. (2025): Microcaddisflies (Trichoptera, Hydroptilidae) of the Baja California peninsula, Mexico: checklist and description of two new species. ZooKeys 1263: 379-388, DOI: 10.3897/zookeys.1263.148086
9DBE04B6C61E5F3384940DB6152EECF2.taxon	etymology	Etymology. Named for the Baja California peninsula, where the specimens were collected.	en	Ramírez-Carmona, Mauricio, Barba-Alvarez, Rafael, Contreras-Ramos, Atilano, Thomson, Robin E. (2025): Microcaddisflies (Trichoptera, Hydroptilidae) of the Baja California peninsula, Mexico: checklist and description of two new species. ZooKeys 1263: 379-388, DOI: 10.3897/zookeys.1263.148086
F70C9448C6DB5A33AE1AA461ECA5E73E.taxon	description	Fig. 3	en	Ramírez-Carmona, Mauricio, Barba-Alvarez, Rafael, Contreras-Ramos, Atilano, Thomson, Robin E. (2025): Microcaddisflies (Trichoptera, Hydroptilidae) of the Baja California peninsula, Mexico: checklist and description of two new species. ZooKeys 1263: 379-388, DOI: 10.3897/zookeys.1263.148086
F70C9448C6DB5A33AE1AA461ECA5E73E.taxon	diagnosis	Diagnosis. This species is most similar to Ochrotrichia aldama (Mosely, 1937). Both have a divided long tenth tergum and an inferior appendage bearing a peg-like setae at the apex. However, the 2 nd process of the tenth tergum of O. rivasi is not as long and shaped as the 1 st process (Fig. 3 B); also, peg-like setae are distributed on the apex and along the inferior appendage (Fig. 3 A, B), while O. aldama only bears peg-like setae at the apex.	en	Ramírez-Carmona, Mauricio, Barba-Alvarez, Rafael, Contreras-Ramos, Atilano, Thomson, Robin E. (2025): Microcaddisflies (Trichoptera, Hydroptilidae) of the Baja California peninsula, Mexico: checklist and description of two new species. ZooKeys 1263: 379-388, DOI: 10.3897/zookeys.1263.148086
F70C9448C6DB5A33AE1AA461ECA5E73E.taxon	description	Description. Male. Forewing length 3.0 mm (N = 3). Head unmodified, with 3 ocelli; antennae unmodified. Tibial spur formula 0, 3, 4. Sternum VII and VIII unmodified, annular. Genitalia. Abdomen sternum VII with very short, tapered mesoventral process (Fig. 3 A). Segment IX anterolateral margin convex (Fig. 3 A), in dorsal view posterior margin fused with tergum X (Fig. 3 B). Tergum X membranous basally, asymmetrical with two processes (Fig. 3 A); 1 st process elongate, with hooked projection near midlength, apex pointed and sclerotized; 2 nd process ¾ the length of 1 st process, margin irregular, with membranous pocket in lateral view (Fig. 3 A, B). Inferior appendage setose, length 3 times greater than width, with slight upward curve, apex rounded; inner surface bearing stout spines; inner surface of right appendage with hook-like basal process (Fig. 3 A, B, C). Phallus simple, elongate, threadlike (Fig. 3 D). Material examined. Holotype: Mexico • ♂; Baja California: Ensenada, Rancho Mike´s Sky; San Rafael River waterfall; 31 ° 05.649 ' N, 115 ° 37.436 ' W; el. 1232 m; 02. vii. 2022; A. Contreras, A. Gómez, Y. Marquez, A. Ramírez & M. Ramírez leg.; UV, White lights (in alcohol) (UMSP 000281127). Paratypes: Mexico • 2 ♂; Same data as holotype (in alcohol) (CNIN). Etymology. Named in honor of Dr Gerardo Rivas, an aquatic acarologist at Facultad de Ciencias of Universidad Nacional Autónoma de México, a friend and former advisor of the first author.	en	Ramírez-Carmona, Mauricio, Barba-Alvarez, Rafael, Contreras-Ramos, Atilano, Thomson, Robin E. (2025): Microcaddisflies (Trichoptera, Hydroptilidae) of the Baja California peninsula, Mexico: checklist and description of two new species. ZooKeys 1263: 379-388, DOI: 10.3897/zookeys.1263.148086
