Helicopsyche (Feropsyche) petri,

Dumas, Leandro Lourenço & Nessimian, Jorge Luiz, 2019, New species of Helicopsyche von Siebold 1856 (Trichoptera: Helicopsychidae) from Brazil, including the redescription of Helicopsyche (Feropsyche) planorboides Machado 1957, Zootaxa 4619 (2), pp. 231-250: 241

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Helicopsyche (Feropsyche) petri

new species

Helicopsyche (Feropsyche) petri  , new species

( Figures 5View FIGURE 5 A–5G)


Diagnosis. The new species is similar to Helicopsyche (F.) monda Flint 1983  and H. (F.) lambda Flint 1983  by the overall shape of the inferior appendages and their basomesal lobes in lateral view. It differs from both in that the inferior appendages are wider dorsally, each with its inner margin strongly projected mesad, forming a rounded large lobe, and the basomesal lobes are less trianguloid, bearing spine-like setae. Furthermore, H. (F.) petri  sp. nov. has tergum X without a mesal notch and is truncate apically, while in H. (F.) monda  and H. (F.) lambda  it has a shallow mesal notch and is more rounded apically.

Description. Adult. Similar to H. (F.) bendego  sp. nov. except as follows: Overall color (in alcohol) uniformly yellowish-brown; antennae, palps and legs pale yellow. Each foreleg anterior apical tibial spur about 3x longer than posterior spur. Male forewings each 3.2–3.9 mm long (n = 10; holotype male = 3.4 mm). Abdominal sternum VI ventral process long, about as long as segment VI, tubular along its length, oriented posteroventrad, slightly wider at base, curved slightly upward in lateral view, with microtrichiae along length, apex rounded, with lamellae apicoventrally ( Figs. 5F, 5GView FIGURE 5).

Male genitalia. Segment IX short ventrally; in lateral view with anteromesal margin well-developed, anterodorsal margin almost straight, and anteroventral margin concave; lateral apodeme well-developed, located midlaterally on segment ( Fig. 5AView FIGURE 5); in dorsal view horseshoe-like, with anterior margin strongly concave ( Fig. 5BView FIGURE 5); in ventral view with anteroventral and posteroventral sclerotized bars, lateral portions well-developed, anterolateral lobes projected anterad ( Fig. 5CView FIGURE 5). Segment X, in lateral view, short, triangular, tapering to apex from base ( Fig. 5AView FIGURE 5); in dorsal view subtrapezoidal, not surpassing apices of inferior appendages, mesodorsal borders well-marked, inverted Y-shaped, bearing sparse stout setae near middle of lateral margins and pair of apicolateral clusters of 4 stout setae, apex truncate, without mesal notch ( Fig. 5BView FIGURE 5). Superior appendages ovate in lateral view, clavate in dorsal view ( Figs. 5A, 5BView FIGURE 5). Basal plate of inferior appendages subtriangular in lateral and ventral views, almost reaching the anteroventral margin of segment IX as viewed laterally ( Figs. 5A, 5CView FIGURE 5); primary branches of inferior appendages each in lateral view nearly drop-like, broad, distal portion about 2x broader than its proximal portion, dorsal margin slightly convex, ventral margin sinuous, apicodorsal margin concave, undulating, with long, stout setae along apical margin, apex pointed ( Fig. 5AView FIGURE 5); in dorsal and ventral views broad, curved mesad, tapering apically ( Figs. 5B, 5CView FIGURE 5); in dorsal view with dorsal portion rounded, strongly projecting mesad (visible also in ventral view), with about 12–15 long, stout setae at inner margin, inner margin undulate, apex narrow, subacute, turned mesad, with an apical short, stout seta ( Fig. 5BView FIGURE 5); in ventral view with inner margin undulating, bearing several long, stout setae ( Fig. 5CView FIGURE 5); basomesal lobes of inferior appendages each short, slightly protruding beyond primary branch in lateral view ( Fig. 5AView FIGURE 5); in ventral view with right-angled median corner, bearing 5-6 short, dark spine-like setae ( Fig. 5CView FIGURE 5). Phallus tubular, moderately down-curved along its length; phallobase narrow, short, slightly inflated mesodorsally, its apicoventral margin elongate, rounded apically, apex semi-membranous; endotheca membranous lobe partially covering endophallus; phallotremal sclerite small, strongly C-shaped ( Figs. 5D, 5EView FIGURE 5).

Holotype male: BRAZIL: Rio de Janeiro: Rio das Ostras, Reserva Biológica União, Trilha Interpretativa do Pilão , riacho, 22°25’29.2” S, 42°02’21.2” W, 07.iii.2014, 42 m, FC Avelino & LS Barbosa leg. ( DZRJ).GoogleMaps 

Paratypes: BRAZIL: Rio de Janeiro: same data as holotype, 8 males ( DZRJ)GoogleMaps  ; same data as holotype, 2 males ( MZSP)GoogleMaps  ; Nova Iguaçu, Tinguá, Reserva Biológica do Tinguá , Rio Tinguá (atrás da brigada), 22°35’08.4” S, 43°26’14.4” W, 13.ix. 2016, 159 m, LL Dumas, JL Nessimian & JF Barbosa leg., 1 male ( DZRJ)GoogleMaps  ; Nova Iguaçu, Tinguá, Reserva Biológica do Tinguá , estrada de captação de água do Macuco , afluente do Rio Tinguá , 22°35’19.5” S, 43°26’27.9” W, 15.ix. 2016, 211 m, LL Dumas, JL Nessimian & JF Barbosa leg., 1 male ( DZRJ)GoogleMaps  ; Miguel Pereira, Vera Cruz, Reserva Biológica do Tinguá , Córrego Fazenda das Pedras , 22°31’16.9” S, 43°25’54.0” W, 10.xi. 2016, 754 m, LL Dumas, JL Nessimian, B Clarkson & JF Barbosa leg., 1 male ( DZRJ)GoogleMaps  .

Distribution. Brazil (Rio de Janeiro).

Etymology. This species is dedicated to the second and last Brazilian emperor Dom Pedro II ( Petrus  means Pedro in Latin), who was born in Rio de Janeiro in 1825 and died in 1891. The Imperial Palace (Paço de São Cristóvão) housed the Brazilian Imperial Family between 1822 and 1889, and also hosted the Republican Constituent Assembly from 1889 to 1891, before being assigned to the use of the National Museum in 1892. Dom Pedro II was considered a patron of arts and science and was an avid amateur scientist, playing a key role in advances in science, technology and education in Brazil. By the end of the 19th century, reflecting the personal preferences of Dom Pedro II, the National Museum started to invest in several scientific areas. The Emperor himself contributed with several of the collections artifacts, which he acquired during many of his trips abroad. In 1946, the Imperial Palace was incorporated into the Universidade Federal do Rio de Janeiro, hosting several researchers and six post-graduations courses, as Zoology, Botany and Anthropology. Unfortunately, the palace, which housed a large part of the 20 million objects in the museum’s collection, was engulfed by a fire on 2 September 2018.


Linnean Society of London


Sao Paulo, Museu de Zoologia da Universidade de Sao Paulo