Alterosa bilanceolata, Dumas, Leandro Lourenço & Nessimian, Jorge Luiz, 2013

Dumas, Leandro Lourenço & Nessimian, Jorge Luiz, 2013, New species of the caddisfly genus Alterosa Blahnik 2005 (Trichoptera: Philopotamidae: Philopotaminae) from Brazil, Zootaxa 3609 (1) : -

publication ID

https://doi.org/ 10.11646/zootaxa.3609.1.2

publication LSID

lsid:zoobank.org:pub:E54579E3-2376-43E4-9A6B-CB766E6B1226

DOI

https://doi.org/10.5281/zenodo.6151313

persistent identifier

https://treatment.plazi.org/id/83684560-FF9D-FFE7-14F4-FDDD0C6DE901

treatment provided by

Plazi

scientific name

Alterosa bilanceolata
status

sp. nov.

Alterosa bilanceolata , new species

Figs. 3 View FIGURE 3 A–E

Alterosa bilanceolata sp. nov. cannot be placed in any of the species groups defined by Blahnik (2005). The new species is easily diagnosed by the shape of the preanal appendages, which are knife-like and bear long setae as viewed laterally. Additionally, the greatly modified structure of the phallobase is also a useful diagnostic character for this species.

Adult. Color (in alcohol) dark brown; legs, palps, and antennae light brown, wing pattern not discernible. Male forewings each 5.8 mm (n=1).

Male genitalia. Tergum VIII with posteromesal margin scarcely or not emarginate. Sternum IX with anterolateral margins forming rounded projection on each side in dorsal half; posteroventral margin produced, forming broadly rounded expansion ( Fig. 3 View FIGURE 3 A). Tergum IX greatly reduced, membranous or fused to base of tergum X ( Fig. 3 View FIGURE 3 B). Tergum X in dorsal view narrow, enlarged at base, with margins weakly protruding, subparallel; apex sensillate, subtruncate in dorsal view, rounded and slightly enlarged in lateral view ( Figs. 3 View FIGURE 3 A, 3B). Intermediate appendages heavily sclerotized, elongate, extending past preanal appendages, rod-like, rounded apically, covered by short, small setae ( Figs. 3 View FIGURE 3 A, 3B). Preanal appendages enlarged, each with row of long setae on external margin, enlarged at basal third as viewed dorsally, knife-like in lateral view; apex subacute ( Figs. 3 View FIGURE 3 A, 3B). Inferior appendages elongate, setose; each with 1st article, in lateral view, approximately 2 times as long as wide, slightly wider at base; 2nd article shorter than 1st article, relatively wide, base nearly as wide as apex of 1st article, narrowed subapically; apex rounded, with small pad of short, stiff apicomesal setae ( Figs. 3 View FIGURE 3 A, 3C). Phallobase tubular, relatively short, very slightly curved, enlarged from midlength to apex as viewed dorsally, greatly modified; posteroventral margins with 2 long spear-like projections, acute apically; posterodorsal margin greatly emarginate, with V-shaped emargination and paired stout spines as viewed dorsally; endotheca without evident spines or phallotremal sclerites ( Figs. 3 View FIGURE 3 D, 3E).

Holotype male: BRAZIL: Paraná: Guaraqueçaba, Ribeirão do Engenho, 25°10’31.0”S, 48°22’16.2”W, el. 25 m, 25.i.2011, JL Nessimian & LL Dumas leg. (DZRJ 3481).

Distribution: Brazil (Paraná state).

Etymology: The epithet of the specific name, bilanceolata , is from the Latin word lanceola (small spear) and the prefix bi- (two, paired), referring to the greatly modified phallobase, which bears paired, apically spear-like projections on the posteroventral margin.

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Trichoptera

Family

Philopotamidae

Genus

Alterosa

GBIF Dataset (for parent article) Darwin Core Archive (for parent article) View in SIBiLS Plain XML RDF