Silvatares holzenthali, Rázuri-Gonzales & Ngera & Pauls, 2022

Razuri-Gonzales, Ernesto, Ngera, M. Francois & Pauls, Steffen U., 2022, A new species of Silvatares (Trichoptera, Pisuliidae) from the Democratic Republic of the Congo, ZooKeys 1111, pp. 371-380 : 371

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Silvatares holzenthali

sp. nov.

Silvatares holzenthali sp. nov.

Figs 1 View Figure 1 , 2 View Figure 2 , 3 View Figure 3


Democratic Republic Of The Congo • ♂; Sud-Kivu, Kahuzi-Biega National Park, Tshibati-Kakezi (up waterfalls); 2.21691°S, 28.77328° Е, 2,120 m a.s.l.; 23 Aug. 2017; Mwangi leg (SMF) [SMFTRI00018633].


Silvatares holzenthali sp. nov. is a member of the Silvatares thrymmifer group of Stoltze (1989) due to the presence of a pair of apical spines on the endotheca. The new species is closest to S. excelsus and S. laetae based on the presence of inferior appendages with a long, secondary basodorsal lobe. The apex of this lobe in S. holzenthali is slightly subtriangular in lateral view, while in S. laetae and S. excelsus it is slightly capitate. Additionally, tergum X in S. holzenthali is broad basally and tapers to a digitate apex while in S. laetae and S. excelsus , tergum X is broad throughout its length.


Adult male. Overall color pale brown (in alcohol). Antennae pale brown with short, whitish setae; antennal segments cylindrical with secondary constriction subapically on each segment; antennae broken. Head and thorax with brown (especially dorsally) and pale brown setae, infraocular wart narrow and long with dark brown setae. Palpi pale brown with brown (especially on apical segment) and pale brown setae. Legs pale brown with short and long dark brown setae. Forewing length ~ 11.7 mm (n = 1; forewing apex damaged). Forewing membrane pale brown, except for a whitish mark on apicodorsal corner of thrydial cell, with short brown setae. Forewing (Fig. 2A View Figure 2 ) with forks I, II, and III present; discoidal cell closed; thrydium present; A2 complete, reaching wing margin; A3 incomplete and ending before reaching wing margin. Hindwing (Fig. 2B View Figure 2 ) with forks II and III present; discoidal cell closed; base of Cu2 fused to base of A1. Segment V with elongate sternal glands, slightly broader apically, globose; segment VII with short ventromesal process.

Male genitalia. Segment IX (Fig. 3A View Figure 3 ) in lateral view widest midlaterally, anterior margin produced into broadly rounded lobe, posterior margin very slightly sinuous, dorsal margin longer than ventral margin, setae on ventral and posterodorsal surfaces. Segment IX (Fig. 3B View Figure 3 ) in dorsal view with posterior margin produced sublaterally and concave mesally, anterior margin broadly concave; in ventral view (Fig. 3C View Figure 3 ), anterior and posterior margins broadly concave. Tergum X (Fig. 3A View Figure 3 ) in lateral view broad basally, tapering into digitate process, apex rounded, concave ventrally, down-turned; in dorsal view (Fig. 3B View Figure 3 ) divided by deep mesal cleft into two setose tergites, setae on lateral and apical margins; mesal margins angulate basally and subapically, lateral margins angulate mesally. Inferior appendages (Fig. 3A View Figure 3 ) with a dorsal lobe arising basally from dorsal surface. Basal segment long, ventral margin slightly concave basally, rounded apically. Dorsal segment longer than ventral segment, somewhat capitate apically. Phallic apparatus (Fig. 3D View Figure 3 ) short and stout, endothecal membrane expanded, with a pair of slender, sharply bent, acute endothecal spines apicodorsally, and a slender, Y-shaped sclerite apicoventrally (Fig. 3E View Figure 3 ; apex of phallic sclerite in dorsal view).

Female. Unknown.

Larva. Unknown.


It is with great pleasure that we name this species after Dr. Ralph W. Holzenthal for his life-long contributions to Trichoptera taxonomy and systematics, especially in the Neotropics. Ralph has not only been an inspiration for Trichoptera researchers across the world but has been a very important mentor for the authors, and most importantly, a very dear friend, encouraging us throughout our careers. We thank Ralph for great craft beer tastings, memorable garden barbecues, fascinating field trips, and woodworking workshops.


Democratic Republic of the Congo (Sud-Kivu Province) (Fig. 1 View Figure 1 ).


The generated sequence was 658 bp in length and only had 0.2% of ambiguous sites. Using BOLD’s tree-based identification tool, the sequence was sister to all available Pisuliidae sequences on the platform. Additionally, the sequence was most similar to an unidentified male adult from the Eastern Cape Province of South Africa, with an 89.14% similarity. However, the South African sequence was only 621 bp long.