Silvatares laetae Ngirinshuti, Tabaro, and Johanson 2019
- Dataset
- The Trichoptera diversity of Nyungwe National Park, Rwanda, with description of a new species in the family Pisuliidae
- Rank
- SPECIES
- Published in
- Ngirinshuti, Leonce, Tabaro, Simon Rukera, Johanson, Kjell Arne (2019): The Trichoptera diversity of Nyungwe National Park, Rwanda, with description of a new species in the family Pisuliidae. European Journal of Taxonomy 576: 1-11, DOI: 10.5852/ejt.2019.576
Classification
- kingdom
- Animalia
- phylum
- Arthropoda
- class
- Insecta
- order
- Trichoptera
- family
- Calamoceratidae
- genus
- Silvatares
- species
- Silvatares laetae
description
Description of holotype LENGTH AND COLOR. Forewing 10.5 mm, hind wing 8.7 mm. Head, thorax and abdomen yellowish-brown (Fig. 3). Antennae dark brown, almost black, slightly longer than forewings. Eyes setose, blackish. Legs brown at proximal segments, tibia and tarsus darker. Spur formula: 2: 4: 4. WINGS. Forewings with greyish brown membrane densely covered with dark brownish setae, slightly darker towards apex and anterior margin. Underside with long, thick and golden setae originating from an enlarged part of Cu 2 (Fig. 4). Forewing venation nearly similar to that of S. excelsus. Sc and R 1 separate basally, connected distally by crossvein. Fork 1 originating before fork 2, fork 4 absent, nygma present in fork 2 and in thyridial cell. Cu 1 b rudimentary, not reaching wing margin, leaving incomplete fork 5, A 1 and A 2 fusing near base. Cu 2 in right angle before fusing with A 1 + 2, crossvein present between Cu 2 and Cu 1 b. Hind wings greyish with dark setae. Long setae extending beyond the posterior margin near wing base. R 1 inconspicuous, terminating in cell between Sc and Rs. Discoidal cell large, nygma present in fork 2, forks 3, 4 and 5 absent. Cu 2 apparently forming distal fork, posterior margin straight behind Cu 1. ABDOMEN (male). Segment VII with small median tooth on sternite. Segment IX protruding into a pair of anteriorly rounded lateral lobes and undulating posterior margin; in dorsal view with deep V-shaped incision of anterior margin. Tergum X in lateral view large, downwardly curving along its length, with U-shaped incision at ventral part of apex; dorsal margin of apex with 3 – 4 sword-shaped megasetae; in dorsal view deeply divided into pair of posterad branches, division basally triangular. Pair of onesegmented inferior appendages curving mesally along their length, with two deeply incised separated branches. Upper branch with dilated apex, lower branch slender, almost thumb-shaped. Phallus stout and curved, with constriction leading to tapering tip in lateral view, equipped with pair of teeth-like structures standing erect in ventral view.
description
Figs 3 – 5
diagnosis
Diagnosis The genitalia of Silvatares laetae Ngirinshuti & Johanson sp. nov. resemble those of S. excelsus (Navás, 1931), particularly due to the presence of large median lobes of tergum X that are curved downwards, and the inferior appendages consisting of two prominent lobes which both curve inwards in ventral view. The new species is distinguished from S. excelsus by the presence of a wide mouth-like incision ventrally on the tip of the median lobes of tergum X, segment IX which is produced into a pair of triangular and posteriorly pointing lateral lobes, and the presence of a pair of longer needle-like processes originating from the apex of the phallus. In addition, S. laetae Ngirinshuti & Johanson sp. nov. has sword-shaped megasetae on tergum X that are absent in S. excelsus.
etymology
Etymology Laetae, named after Dr Laetitia Nyinawamwiza in recognition of her contribution to supporting young Rwandan academicians interested in research on aquatic biota.
materials_examined
Material examined Holotype RWANDA • 1 ♂ (in alcohol); Western Province, Nyamasheke District, Nyungwe National Park, locality Gisakura, Karamba river I; 2.479 ° S, 29.119 ° E; 1917 m a. s. l.; 18 Oct. 2018; K. A. Johanson, L. Ngirinshuti and P. Munyaneza leg.; light trap # 06 - 2018; DNA voucher LG 8; NHRS. Paratype RWANDA • 1 ♂ (in alcohol); Western Province, Nyamasheke District, Nyungwe National Park, Nyamirabyo River; 2.469 ° S, 29.108 ° E; 1905 m a. s. l.; 23 – 26 Oct. 2018; K. A. Johanson, L. Ngirinshuti and P. Munyaneza leg.; Malaise trap # 23 - 2018; DNA voucher LH 9; NHRS.