Oecetis pseudoamazonica, Martín, Paola Rueda, Gibon, Francois-Marie & Molina, Carlos Israel, 2011

Martín, Paola Rueda, Gibon, Francois-Marie & Molina, Carlos Israel, 2011, The genus Oecetis McLachlan in Bolivia and northwestern Argentina (Trichoptera: Leptoceridae), with new species and identification key for males of Oecetis species from Mexico, Central and South America, Zootaxa 2821, pp. 19-38 : 31

publication ID

https://doi.org/ 10.5281/zenodo.277232

DOI

https://doi.org/10.5281/zenodo.6186089

persistent identifier

https://treatment.plazi.org/id/03C687EA-FFA5-FFCB-FF40-AA92752DF9DB

treatment provided by

Plazi

scientific name

Oecetis pseudoamazonica
status

sp. nov.

Oecetis pseudoamazonica , new species

Fig. 11 View FIGURE 11

Oecetis pseudoamazonica n. sp. is closely related to O. amazonica ( Banks 1924) View in CoL . The male genitalia of the 2 species are almost identical, and there are only small differences in some genital characters and wing venation. There are differences in the anterior margins of segment IX, which are reinforced by a conspicuous antecosta in both species. In O. amazonica View in CoL this antecosta is continuous and it is not interrupted by its acrotergite ( Fig. 1 View FIGURE 1 C), whereas, in the new species, this antecosta is discontinuous at the acrotergite. In the genitalia, the posteroventral margin of segment IX is rounded in O. amazonica View in CoL in ventral view ( Fig. 1 View FIGURE 1 D), but clearly produced into a median process which is rounded at the tip in the new species ( Fig. 11 View FIGURE 11 D). The phallic apparatus shows a subtle difference in the length of the ventral process, which is longer in O. amazonica View in CoL . In O. amazonica View in CoL , the crossveins r–m and m–cu are almost in line, but, in the new species, they are clearly staggered. The difference in size is important, the length of a forewing of O. amazonica View in CoL is 10 mm (n = 16) while it is 6.1 mm (n = 5) in O. pseudoamazonica n. sp. The coloration pattern of wings is sharper and darker in O. amazonica View in CoL , paler in the new species. The apex of each forewing in O. amazonica View in CoL is obtuse, whereas it is acute in O. pseudoamazonica n. sp. Fork I in of O. amazonica View in CoL is petiolate, but sessile in O. pseudoamazonica n. sp.

Specific diagnosis. Oecetis pseudoamazonica n. sp. can be distinguished from other species by the fact that in each forewing, R2+3 is branched and without a petiole, the apex of each forewing is acute, the acrotergite of segment IX is not separated from the rest of dorsum IX by antecosta, the posteroventral margin of segment IX has a median process that is rounded at the apex, and the forewings are relatively short.

Adult. Length of each forewings: 6.1 mm. Forewings each with R2+3 branched at midpoint of stigma and without petiole. Hind wings each with R2+3 and M branched near margin of wing; Cu1 branched more deeply ( Fig. 11 View FIGURE 11 A).

Male genitalia. Segment IX annular with 2 dorsal knobs; anterolateral margins almost straight, posterior margin slightly angulate ( Fig. 11 View FIGURE 11 B). Posterior margin of segment IX reinforced with well developed antecosta, except with antecosta poorly developed, bent, and partially bordering acrotergite in dorsal view ( Fig. 11 View FIGURE 11 C). Posteroventral margin of segment IX produced into median rounded process in ventral view ( Fig. 11 View FIGURE 11 D). Preanal appendages rounded with broad bases in lateral view ( Fig. 11 View FIGURE 11 B); fused almost completely on midline with U–shaped median excision in dorsal view ( Fig. 11 View FIGURE 11 C). Tergum X membranous, digitate and slightly upcurved in lateral view ( Fig. 11 View FIGURE 11 B); broad at base and slightly narrowed at tip in dorsal view ( Fig. 11 View FIGURE 11 C). Inferior appendages broad, each with ventral margin curved with apex thin and rounded in lateral view ( Fig. 11 View FIGURE 11 B); base broad with curved external margin gradually narrowing distally, abruptly narrowed at tip in ventral view ( Fig. 11 View FIGURE 11 D). Phallic apparatus rounded, with sinuous paramere spine, C-shaped phallotremal sclerite, and acute ventral process in lateral view ( Figs. 11 View FIGURE 11 E– F).

Holotype male. BOLIVIA: Río Mocovi, near Trinidad, 14°44'27''S, 64°54'24''W, 12.11.2001, ( IML).

Paratypes. 2 males, same as holotype, ( IML). Río Itenez, Versalles, 12°39'42''S, 63°22'21''W, 04.v.2006, (CBF-UMSA) ― 1 male; Lake San Gregorio, near Reyes, ( IML) ― 1 male; Lake Granja, Bella Vista, 13°15'50''S, 63°42'33''W, 06.v.2006, ( IML) ― 1 male.

Etymology. This species is named O. pseudoamazonica because of its close relationship and appearance with O. amazonica .

IML

Instituto Miguel Lillo

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Trichoptera

Family

Leptoceridae

Genus

Oecetis

Loc

Oecetis pseudoamazonica

Martín, Paola Rueda, Gibon, Francois-Marie & Molina, Carlos Israel 2011
2011
Loc

O. amazonica (

Banks 1924
1924
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