Smicridea (Smicridea) ipiranga 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 : 172-175

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

urn:lsid:zoobank.org:act:1E07D339-6A5A-4E95-A76D-A94339AD91AC

Figs 3 , 4E , 9 – 10

Diagnosis

This new species can be assigned to the fasciatella complex. Smicridea ipiranga sp. nov. is similar to S. varia (Banks, 1913) , S. lacanha Bueno-Soria & Hamilton, 1986 , and S. catherinae Blahnik, 1995 based on the shape of the apical segment of the inferior appendage, which is slender, strongly curved medially and has a pointed apex. These four species also have a single long, stout apical spine-like seta on the internal margin of the basal segment of the inferior appendage. However, S. ipiranga sp. nov. can be distinguished from its congeners by its diminutive size (on average 3.55 mm); the most similar species in the complex are twice its size on average: S. catherinae (about 6.0 mm), S. lacanha (about 7.9 mm), and S. varia (about 6.15 mm). Additionally, the new species has the phallotremal sclerite with the distal region M-shaped in dorsal view, while in S. catherinae , S. lacanha , and S. varia , this sclerite is Y-shaped.

Etymology

The specific epithet is a reference to the Ipiranga Stream, located in the Reserva Florestal Adolpho Ducke, where the type specimen was collected. This name is used in apposition.

Material examined

Holotype BRAZIL • ♂; Amazonas , Manaus , Reserva Florestal Adolpho Ducke, Igarapé Ipiranga; 02°58′53.6″ S, 59°54′24.4″ W; 95 m a.s.l.; 30 Jun.–2 Jul. 2015; A.M.O. Pes, G.R. Desiderio, P. Barcelos-Silva and W. Xavier leg.; Pennsylvania trap; INPA-TRI 000112 .

Paratypes BRAZIL • 2 ♂♂; same locality as for holotype; 9 Aug. 2013; A.M.O. Pes and P. Barcelos-Silva leg.; white sheet with an LED light; INPA-TRI 000113 • 3 ♂♂; same collection data as for holotype; Malaise trap; INPA-TRI 000114 • 5 ♂♂; same collection data as for holotype; Malaise trap; MZUSP • 108 ♂♂; same collection data as for holotype; INPA-TRI 000115 • 1 ♂; Presidente Figueiredo , AM–240, Km 13, Corredeira da Dona Maroca ; 02°02′00.1″ S, 59°51′45.1″ W; 19 Apr. 2008; U.G. Neiss leg.; white sheet with an LED light; DZUP • 6 ♂♂; Presidente Figueiredo , Balneário Sossego da Pantera, Igarapé da Onça; 02°05′57″ S, 60°01′02″ W; 92 m a.s.l.; 23 Aug. 2012; A.M.O. Pes leg.; white sheet with an LED light; DZRJ .

Description

Adult male ( Figs 9–10 )

FOREWING LENGTH. 3.40–3.62 mm (mean = 3.55, SD = 0.07, n = 6).

COLOR. General color dark brown (in alcohol) or black (pinned) ( Fig. 9A ). Antennae yellowish brown ( Fig. 9A ). Head dark, with white setae on dorsum ( Fig. 9B–C ); dorsally with weakly-pronounced median suture; with five setal warts; anteromesal wart small, rounded; anterolateral pair undivided, weakly delimited; posterolateral pair large, ovoid ( Fig. 9C ). 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. 9B ). Thorax dark brown, covered with pale brown setae; legs dark brown, with mid-leg tarsi pale yellowish ( Fig. 9A ). Wing venation typical for subgenus ( Fig. 9D–E ). Forewings, in alcohol, brown, with white transverse band subapically on pterostigma reaching base of R4+5 and small white spot on apex of Cu2 ( Fig. 9D ); pinned specimens with 2 transversal bands of white setae, one continuous band in proximal portion reaching from base of subcostal vein to apex of 1A, the other band discontinuous in distal portion reaching from pterostigma to apex of Cu1; apex of wing with fringe of white setae ( Fig. 9A ). Sternum V with anterolateral glandular processes slightly shorter than sternum. Abdominal segments VI and VII with 2 pairs of internal glands, both pairs longer than their containing segments ( Fig. 9F ).

MALE GENITALIA ( Fig. 10 ). Segment IX in lateral view with anterolateral margin straight, strongly sclerotized ( Fig. 10A ); posterodorsal margin bearing small spicules, distributed in two subquadrate bands ( Fig. 10B ). Tergum X elongate; in lateral view, ventrolateral margin strongly sclerotized, with small subapical lobe; apex produced and upturned ( Fig. 10A ); in dorsal view, lateral margin slightly sinuous; dorsomesal setose area bearing five medium-sized, thin setae; divided apicomesally by V-shaped incision about ¼ its length; apex of tergite rounded, with large globose lobe and about eight short, stout setae ( Fig. 10B ). Inferior appendages 2-segmented; basal segment long, slightly inflated distally, covered with long, thin setae, with one long, stout apical spine-like seta on mesal margin; apical segment short, about ⅓ as long as basal segment, slender, strongly curved medially, apex acute with numerous short, thin setae on mesal margin ( Fig. 10B ). Phallic apparatus long and tubular; basal section, in lateral view, enlarged, 2× diameter of phallotheca at its narrowest point, forming an angle of about 116° with apical section; median section of phallotheca straight, without processes ( Fig. 10C ); apex slightly enlarged, without processes or plates; endothecal membranes without spines; phallotremal sclerite, in dorsal view, distinct, strongly sclerotized, proximal region enlarged and narrowing mesally, distal region M-shaped ( Fig. 10D–E ); in lateral view, aciculate ( Fig. 10C ). Ejaculatory duct of endophallus, in lateral view, distinct, slightly sclerotized ( Fig. 10C ). When endothecal membranes are everted, phallotremal sclerite divided into two disconnected parts, one long, apicomesal, rod-like, and the other with a pair of comma-shaped sclerites, distally slightly curved ( Fig. 10F ).

Bionomics

The males of S. ipiranga sp. nov. were collected near streams in the central Amazon, mainly in a 2 nd order stream (Igarapé Ipiranga) located in the Reserva Florestal Adolpho Ducke, an area of primary Amazon rainforest of about 100 km 2 that is under the protection of the Instituto Nacional de Pesquisas da Amazônia (INPA). The riparian vegetation along this stream is about 2.4 m wide and 0.29 m deep, with a sandy bottom, and a medium-speed water flow ( Fig 4E ). Its water is clear and acidic (pH 5.1), oxygen solubility levels are high (6.9 mgL), electrical conductivity is low (8.5 µScm-1), and the average temperature is 25.6°C. Specimens of S. ipiranga sp. nov. were also collected in medium-sized streams in the municipality of Presidente Figueiredo (Corredeira da Dona Maroca and Igarapé da Onça), 3.5–12.5 m in width, 0.19–0.44 m deep, with fast-flowing water. These streams were used for recreation (swimming and camping), with rocky bottoms characterized by black and acidic water (pH 4.2–4.8), low electrical conductivity (10.9 µScm-1), and a water temperature of 25ºC.

Distribution ( Fig. 3 )

Brazil: Amazon (Amazonas).

Figures

Fig. 3. Geographical distribution map for the new species of Smicridea McLachlan, 1871 treated in this study.

Fig. 4. Habitats of the new species of Smicridea McLachlan, 1871 treated in this study: A. First-order stream, Amazonas, Brazil, collection site of Smicridea (Smicridea) blahniki Desiderio, Pes & Hamada sp. nov. B. Rio Irani, Santa Catarina, Brazil, collection site of S. (S.) brevitruncata Desiderio, Pes & Hamada sp. nov. C. Arroio Lajeado, Rio Grande do Sul, Brazil, collection site of S. (S.) caaguara Desiderio, Pes & Hamada sp. nov. holotype. D. Cascata Raddatz, Arroio Teotônica, Rio Grande do Sul, Brazil, collection site of S. (S.) caaguara sp. nov. paratype. E. Igarapé Ipiranga, Amazonas, Brazil, collection site of S. (S.) ipiranga Desiderio, Pes & Hamada sp. nov. F. Balneário Km 18.5, Amazonas, Brazil, collection site of S. (S.) polyacantha Desiderio, Pes & Hamada sp. nov.

Fig. 9. Smicridea (Smicridea) ipiranga Desiderio, Pes & Hamada sp. nov., holotype, ♂ (INPA-TRI 000112). A. Lateral habitus (in alcohol). B. Head, right lateral view. C. Head, dorsal view. D. Forewing, right dorsal view. E. Hind wing, right dorsal view. F. Abdomen, ventral view. Scale bars in mm: A = 2; B–C = 0.5; D–F = 1.

Fig. 10. Smicridea (Smicridea) ipiranga Desiderio, Pes & Hamada sp. nov., male terminalia. – A–E. Holotype (INPA-TRI 000112). A. Terga IX, X and inferior appendages, lateral view. B. Same, dorsal view. C. Phallic apparatus, lateral view. D. Apex of phallic apparatus, dorsal view. E. Apex of phallic apparatus (photograph). –F. Paratype (INPA-TRI 0115), apex of everted phallic apparatus (photograph), dorsal view. Scale bars in mm: A–C = 0.1; D–F = 0.05.