Smicridea (Smicridea) brevitruncata Desiderio, Pes & Hamada, 2021

Desiderio, Gleison Robson, Pes, Ana Maria, Andrade-Souza, Vanderly & Hamada, Neusa, 2021, The Smicridea (Smicridea) fasciatella species group (Trichoptera: Hydropsychidae) in Brazil: six new species and new distributional records, European Journal of Taxonomy 750 (1), pp. 156-196 : 164-168

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Smicridea (Smicridea) brevitruncata Desiderio, Pes & Hamada

sp. nov.

Smicridea (Smicridea) brevitruncata Desiderio, Pes & Hamada sp. nov.

Figs 3 View Fig , 4B View Fig , 5 – 6 View Fig View Fig


Smicridea brevitruncata sp. nov. belongs to the albosignata complex of Flint (1981). It is most similar to S. riita Flint, 1981 from Venezuela based on the obliquely truncated apex of tergite X in dorsal view. However, in S. brevitruncata sp. nov. the apical segment of the inferior appendage is thick and short, and the truncated apex has numerous medium-sized, acuminate setae on the mesal margin, whereas in S. riita it is long, slender, with an acute apex, bearing numerous short, thin setae. Furthermore, the new species can be diagnosed by the basal segment of the inferior appendage having four long, stout apical spine-like setae, two dorsal and two on the mesal margin, and by the shape of the phallotremal sclerite, mainly in dorsal view. Additionally, S. brevitruncata sp. nov. differs from all other species of S. ( Smicridea ) by the absence of the internal reticulate sacs on abdominal segments VI and VII.


The specific epithet is an allusion to the characteristics of the inferior appendages, which are short and apically truncated. Derived from the Latin words, ʻ brevi ʼ = ʻshortʼ and ʻ truncata ʼ = ʻpiece cut off, tip, endʼ.

Material examined

Holotype BRAZIL • ♂; Santa Catarina, Ponte Serrada , BR–282, Rio Irani , Parque dos Butieiros ; 26º55′49.2″ S, 51º52′29.3″ W; 1022 m a.s.l.; 5 Sep. 2009; N. Hamada, A.M.O. Pes and J.O. Silva leg.; white sheet with an LED light; INPA-TRI 000108 . GoogleMaps

Paratypes BRAZIL • 8 ♂♂; same collection data as for holotype; INPA-TRI 000109 GoogleMaps 2 ♂♂; same collection data as for holotype; DZUP GoogleMaps 2 ♂♂; same collection data as for holotype; DZRJ GoogleMaps 2 ♂♂; same collection data as for holotype; MZUSP GoogleMaps .


Adult male ( Figs 5–6 View Fig View Fig )

FOREWING LENGTH. 4.52–5.49 mm (mean = 4.75 mm, SD = 0.37, n = 5).

COLOR. General color dark brown (in alcohol) ( Fig. 5A View Fig ). Antennae brown ( Fig. 5A View Fig ). Head dark, with grayish to black setae on dorsum ( Fig. 5B–C View Fig ); dorsally with slightly pronounced median suture; with five setal warts; anteromesal wart small, rounded; anterolateral pair undivided, weakly delimited; posterolateral pair large, ovoid ( Fig. 5C View Fig ). Maxillary palp with segments 1–4 increasing gradually about 0.8× in size toward more apical segments, segment 5 long, about 1.2× as long as all previous segments combined ( Fig. 5B View Fig ). Thorax dark brown, covered with brown setae; legs brown, with mid-leg tarsi yellowish ( Fig. 5A View Fig ). Wing venation typical for subgenus ( Fig. 5D–E View Fig ). Forewings, in alcohol, uniformly fuscous, faintly marked with transverse band subapically on pterostigma reaching base of R4+5 and small spot on apex of Cu2 ( Fig. 5D View Fig ). Sternum V with anterolateral glandular processes slightly shorter than sternum. Abdominal segments VI and VII without pairs of internal reticulate sacs ( Fig. 5F View Fig ).

MALE GENITALIA ( Fig. 6 View Fig ). Segment IX in lateral view with anterolateral margin straight, strongly sclerotized ( Fig. 6A View Fig ); posterodorsal margin bearing small spicules, distributed in two subtriangular bands ( Fig. 6B View Fig ). Tergum X elongate; in lateral view, ventrolateral margin strongly sclerotized, with 10 to 12 short, stout setae on apical third; apex produced and upturned ( Fig. 6A View Fig ); in dorsal view, lateral margin slightly rounded; dorsomesal setose area bearing 10 medium-sized, thin setae; divided apicomesally by V-shaped incision about ⅓ its length; apex of tergite obliquely truncated, with about three short, thin setae ( Fig. 6B View Fig ). Inferior appendages 2-segmented; basal segment long, slightly inflated distally, covered with long, thin setae, with four long, stout apical spine-like setae, two dorsal and two on mesal margin; apical segment short, about ¼ as long as basal segment, thick, slightly curved medially, apex truncated with numerous medium-sized, acuminate setae on mesal margin ( Fig. 6B View Fig ). Phallic apparatus long and tubular; basal section, in lateral view, enlarged, 4× diameter of phallotheca at its narrowest point, forming an angle of about 113° with apical section; median section of phallotheca straight, without processes ( Fig. 6C View Fig ); apex enlarged, with pair of claw-shaped internal dorsolateral plates, longer than basal width, curved mesally and directed posterad; endothecal membranes without spines; phallotremal sclerite, in dorsal view, distinct, strongly sclerotized, proximal region with bifid base and pointed apex, distally with pair of subtriangular, toothlike structures, which are overlapped by pair of slender, curved mesad processes ( Fig. 6D–E View Fig ); in lateral view, proximal region with small middorsal lobe, distally directed downward ( Fig. 6C View Fig ). Ejaculatory duct of endophallus, in lateral view, distinct, slightly sclerotized ( Fig. 6C View Fig ).


This species was collected near a large fast-flowing river about 20 m wide, located at 1022 m a.s.l. in the southern part of the Brazilian Atlantic Forest ( Fig 4B View Fig ). In this region the predominant vegetation is Mixed Ombrophilous Forest composed mainly of Araucaria angustifolia (Bertol.) Kuntze ( Araucariaceae ), with intense agricultural and pasture activities.

Distribution ( Fig. 3 View Fig )

Brazil: Atlantic Forest (Santa Catarina).


Brazil, Parana, Curitiba, Universidade Federal do Parana, Museu de Entomologia Pe. Jesus Santiago Moure


Universidade Federal do Parana, Colecao de Entomologia Pe. Jesus Santiago Moure


Museu de Zoologia da Universidade de Sao Paulo