Leucotrichia ruiteri, Thomson & Armitage & Harris, 2022

Thomson, Robin E., Armitage, Brian J. & Harris, Steven C., 2022, The Trichoptera of Panama. XIX. Additions to and a review of the genus Leucotrichia (Trichoptera, Hydroptilidae) in Panama, ZooKeys 1111, pp. 425-466 : 425

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scientific name

Leucotrichia ruiteri

sp. nov.

Leucotrichia ruiteri sp. nov.

Figs 2A View Figure 2 , 14 View Figure 14

Type locality.

Panama: Chiriqui Province: Cuenca 108; Boquete District; Quebrada Jaramillo, Finca Monterey; 8.7632°N, 82.41383°W; 1,214 m a.s.l.

Type material.

Holotype: male, Panama: Chiriqui Province: Cuenca 108; Boquete District; Quebrada Jaramillo, Finca Monterey; 8.7632°N, 82.41383°W; 1,214 m a.s.l.; 8-12 Jun. 2018, K. Collier, leg.; Malaise trap; in alcohol; MIUP-004-T-2021. Paratype: same data as for holotype; 1 male; UMSP.

Other material examined.

Panama: Chiriqui Province • 1 male; Cuenca 102, Renacimiento District; La Amistad International Park , Rio Candela , Finca Felix , PSPSCB-PILA-C102-2017-021; 8.90614°N, 82.72882°W; 1,799 m a.s.l., 1-5 Sep. 2017; E. Álvarez, T. Ríos, E. Pérez, leg.; Malaise trap; in alcohol; COZEM GoogleMaps . Veraguas Province • 1 male; Cuenca 132, Santa Fe National Park, Rio Mulaba , 2do Brazo , PSPSCB-NPSF-C-097-2017-007; 8.52577°N, 81.13045°W; 623 m a.s.l.; 19-23 Apr. 2017; A. Cornejo, T. Ríos, E. Álvarez, C. Nieto, leg.; Malaise trap; in alcohol; MUPADI GoogleMaps .


Leucotrichia ruiteri sp. nov. is most similar to L. hispida , as both species bear prominent setae on the posteroventral production of sternum VIII, a bilobed phallus apex, and a similar shaped inferior appendage. Leucotrichia ruiteri can be separated by the single, elongate seta on sternum VIII compared to the cluster of setae present on L. hispida . Additionally, the forewings of L. ruiteri are modified with a large setae-filled pocket, while those of L. hispida are unmodified.


Male. Length of forewing 2.0-2.1 mm (n = 4). Forewing with large pocket filled with scales (Fig. 2A View Figure 2 ); hindwing unmodified. Head unmodified, with three ocelli; antennae unmodified. Tibial spur count 1, 3, 4. Color in alcohol brown. Genitalia. Abdominal sternum VII slender, elongate (Fig. 14A, D View Figure 14 ). Sternum VIII with posteroventral production bearing prominent apical seta (Fig. 14A View Figure 14 ); in ventral view posterior margin concave (Fig. 14D View Figure 14 ). Segment IX anterolateral margin convex, posterolateral margin straight with slight irregularity (Fig. 14B View Figure 14 ); dorsally, anterior margin concave, posterior margin broadly convex (Fig. 14C View Figure 14 ). Tergum X with dorsal sclerite with irregular dorsal margin; ventral sclerite semi-elliptic with knoblike projection mesally on posterior margin; membranous apex subquadrate (Fig. 14B, C View Figure 14 ). Subgenital plate with dorsal arm simple, with slight preapical emargination on dorsal margin, apex truncate (Fig. 14B View Figure 14 ); ventral arm narrowing apically, ventral margin slightly sinuate, in ventral view subovate with narrow basal projection and small rounded apical emargination (Fig. 14B, D View Figure 14 ). Inferior appendage broadest mesally, with small dorsal subapical peg-like seta, apex rounded (Fig. 14B View Figure 14 ); ventrally slender, with digitate basal projections, apex slightly hooked on inner margin (Fig. 14D View Figure 14 ). Phallus tubular basally, constricted at midlength with typical median complex bearing basal loop and pair of spherical “windows”; apex membranous with internal sclerotized structures and two apical lobes extending dorsad (Fig. 14E, F View Figure 14 ).




This species is named in honor and memory of Dave Ruiter, a passionate and enthusiastic caddisfly researcher and good friend, who recently passed away.