Smicridea (Rhyacophylax) dumasi, Santana & Desiderio & Hamada, 2021

Santana, Vitória, Desiderio, Gleison Robson & Hamada, Neusa, 2021, Two new species of Smicridea (Rhyacophylax) Müller 1879 (Trichoptera Hydropsychidae) from Atlantic Forest, Brazil, Zootaxa 4941 (1), pp. 115-126 : 120-124

Smicridea (Rhyacophylax) dumasi sp. nov. Santana, Desiderio & Hamada

Figs 3–5

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Diagnosis. Smicridea (Rhyacophylax) dumasi sp. nov. is similar to S. (Rhyacophylax) fogasa Oláh & Johanson 2012 ( Ecuador) , S. (Rhyacophylax) kampoka Oláh & Johanson 2012 ( Peru) , S. (Rhyacophylax) nemorosa Holzenthal & Blahnik 1995 ( Costa Rica), and S. (Rhyacophylax) salta Flint 1974 ( Mexico) based on the presence of a midlateral process on the ventrolateral margin of tergum X. However, in this region of the tergum, S. (R.) dumasi sp. nov. also has one small pointed, process subapically, which is absent in those species mentioned above. The new species has 11 medium-sized, ventral spines and three lateroventral spines on the middle and apex of the phallic apparatus, respectively, whereas S. (R.) fogasa , S. (R.) kampoka , S. (R.) nemorosa , and S. (R.) salta have processes or lobes in various other forms, number, and positions on the apex of the phallic apparatus.Additionally, S. (R.) dumasi sp. nov. can be recognized by six long, stout spines on the dorsal periphallic cap of the phallic apparatus.

Description. Adult male. Length of each forewing 7.56–8.40 mm (mean = 7.92 mm, SD = ±0.22, n = 5). General color pale brown (in alcohol) ( Fig. 4A ). Antennae pale brown ( Fig. 4A ). Head pale brown, with pale setae on dorsum ( Fig. 4C ); dorsally with well-pronounced coronal suture; with five setal warts; anteromesal wart small, rounded; anterolateral pair partially divided, weakly delimited; posterolateral pair large, ovoid ( Fig. 4C ). Eye width, in dorsal view, 1/2 that of interocular distance ( Fig. 4C ). Maxillary palp with segment 3 about 2X longer than segments 1 or 2 and about same length as segment 4, segment 5 about 1.2X longer than all previous segments combined ( Fig. 4B ). Thorax pale brown, covered with brown setae ( Fig. 4A ); legs pale brown, with tarsi of the fore- and midlegs yellowish ( Fig. 4A ). Wing venation typical for subgenus ( Figs 4D, 4E ). Forewings, in alcohol, pale yellow, with large, brown, transverse band subapically arising on R2+3 and reaching apex of Cu1a+b, and brown spots on crossveins and another along bases of C and Sc ( Fig. 4D ). Sternum V with pair of anterolateral glandular processes slightly shorter than sternum. Abdominal segments VI and VII without internal glands ( Fig. 4F ).

Male genitalia. Segment IX in lateral view with anterolateral margin nearly straight, weakly sclerotized ( Fig. 5A ); posterodorsal margin strongly produced, rounded, bearing small spicules ( Figs 5A, 5B ). Tergum X elongate; in lateral view, ventrolateral margin strongly sclerotized; in dorsal view, asymmetrical, with one medium-sized, pointed, midlateral process, curved mesad on insect’s right side, two on left side: larger process with apex bifid and curved mesad, smaller process halfway between larger process and tergum apex; apex of tergum produced and slightly upturned ( Fig. 5A ); lateral margins slightly sinuous beyond midlateral processes; dorsomesal setose area bearing six to seven medium-sized pairs of fine setae; divided apicomesally by V-shaped incision about 1/2 its length; apices of tergum obliquely truncate, each with about five short, fine setae ( Fig. 5B ). Inferior appendages each 2-segmented; basal segment long, slightly inflated distally, covered with medium-sized to long, thin setae, with three long, stout apical spine-like setae on internal margin; apical segment about 1/3 as long as basal segment, thick, covered with medium-sized, fine setae, curved mesad, apex rounded ( Figs 5A, 5B ). Phallic apparatus long and tubular; basal section, in lateral view, enlarged, 3X diameter of phallotheca at its narrowest portion, forming angle of about 83° with apical section; median section of phallotheca slightly curved ventrad with 8 to 11 mediumsized, ventral spines, and with dorsal periphallic cap sclerotized and bearing six long, stout spines ( Fig. 5C ); apex, in dorsal view, not enlarged ( Fig. 5D ); in lateral view, with three medium-sized, lateroventral spines, directed posterad ( Fig. 5C ); endothecal membranes, in dorsal view, without spines; phallotremal sclerite, in dorsal view, distinct, strongly sclerotized, divided into two slender, paired lobes with obliquely truncated apices ( Fig. 5D ); in lateral view, slender, upturned apically ( Fig. 5C ). Ejaculatory duct of endophallus, in lateral view, distinct, slightly sclerotized. When endothecal membranes everted, distinctly reticulated, wrapping around phallotremal sclerite, fully extended and shown in Figs 5E, 5F .

Female and immature stages. Unknown.

Material examined. Holotype male. BRAZIL: São Paulo: Salesópolis, Estaç „o Biológica de Boracéia , Casa Grande , Pedreira , 15.xi.1974; C.G. Froehlich leg., ( MZUSP).

Paratypes: same data as holotype, 4 males ( MZUSP) . Paraná: Guarapeçaba, RPPN Salto Morato, Rio Morato , near the dormitory, 25°10’58.3”S, 48°17’57.2”W, 8 m a.s.l., 4 males, 25.i.2011, L.L. Dumas & J.L. Nessimian legs., ( DZRJ) ; same data, except 4 males (INPA-TRI 000105), 4 males ( DZUP) .

Distribution. BRAZIL (Atlantic Forest: Paraná and S„o Paulo states) ( Fig. 3 ).

Etymology. This new species is named in honor of Dr. Leandro Lourenço Dumas (Universidade Federal do Rio de Janeiro, UFRJ, Brazil) in recognition of his contributions to the study of Brazilian caddisflies.

Figures

FIGURE 3. Geographical distributions of the two new species of Smicridea (Rhyacophylax) described in this study, in the Atlantic forest biome, S„o Paulo and Paraná states, Brazil.

FIGURE 4A–4F. Smicridea (Rhyacophylax) dumasi sp. nov., male. 4A, habitus, dorsal (in alcohol). 4B, head, right lateral. 4C, head, dorsal. 4D, right forewing, dorsal. 4E, right hind wing, dorsal. 4F, abdominal segments V–VIII, ventral. Scale bars in mm: 4A = 2; 4B, 4C = 0.5; 4D, 4E, 4F = 1.

FIGURE 5A–5F. Smicridea (Rhyacophylax) dumasi sp. nov., male genitalia. 5A, left lateral. 5B, dorsal. 5C, phallic apparatus, left lateral. 5D, apex of phallic apparatus, dorsal. 5E, apex of phallic apparatus, left lateral. 5F, apex of everted phallic apparatus, left lateral. Scale bar in mm: 5A, 5B = 0.2; 5C, 5D, 5E = 0.01; 5F = 0.05.