Oecetis Martín, Gibon & Molina, 2011, n.sp.
Creators: name: Martín, Paola Rueda
name: Gibon, Francois-Marie
name: Molina, Carlos Israel
Publisher: name: Zenodo
Year: 2011
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Trichoptera
Leptoceridae
Oecetis

description: Key to the males of Oecetis species from Mexico, Central and South America
It is recommended that the user of this identification key refer to the original descriptions of species to corroborate species determinations. Because some species of Oecetis show variations, identifications may be difficult using only an identification key. For example, in the O. avara Group, differences among O. avara, O. metlacensis, O. marquesi, O. elata and O. inconspicua are subtle. Furthermore, the structure of membranous tergum X can be difficult to recognize. All characters in this identification key are visible in the lateral view of the male genitalia, except for O. amazonica and O. pseudoamazonica n.sp., in which case characters of wings are used. Oecetis haitises Flint & Sykora (2004), from Hispaniola (Dominican Republic), is known only from the female holotype.
1 Phallic apparatus spherical, not curved; paramere spine long, sinuous (Figs 1 E–F).................................. 2
1’ Phallic apparatus cylindrical and generally curved (Figs 2 E–F); paramere spine present or absent, but if present not long, sinu- ous (Figs 2 E–F)....................................................................................... 6
2(1) Tergum X slightly broader at base and narrower at tip in dorsal view (Figs 6 C, 7C); inferior appendages each broad at base with elongate apical process longer than width of appendage in lateral view (Figs 6 B, 7B) and usually with dorsal process slen- der and nearly parallel with apical process (Fig. 6 B).......................................................... 3
2’ Tergum X with same width from base to tip (Figs 1 C, 11C); inferior appendages each broad at base with apical process shorter than width of appendage and with dorsal process shorter than wide and in nearly 90° angle with apical process (Figs 1 B, 11B).................................................................................................... 5
3(2) Length of each inferior appendage more than 3 times maximum width (Bueno-Soria 1981, fig. 2).............................................................................................. O. pseudoinconspicua Bueno-Soria.
3’ Length of each inferior appendage no more than 2.5 two times maximum width (Figs 6 B, 7B)........................ 4
4(3’) Dorsal process of each inferior appendage slender, about as narrow as apical process in lateral view, projecting apicad (Fig. 6 B).................................................................................... O. excisa Ulmer.
4’ Dorsal process of each inferior appendage broader than apical process, not projecting (Fig. 7 B)... O. inconspicua (Walker).
5(2’) Each forewing with apical margin rounded, fork I petiolate, coloration pattern sharp, apically much darker than base (Fig. 1 A); acrotergite of segment IX clearly separated by well developed and straight antecosta from rest of segment IX (Fig. 1 C)........................................................................................ O. amazonica (Banks).
5’ Each forewing with apical margin acute, fork I sessile, coloration pattern with less contrast, apically darker than base but not contrasting as strongly (Fig. 11 A); acrotergite of segment IX forming anterior indentation in dorsum of segment IX behind weakly developed and curved antecosta (Fig. 11 C)................................ O. pseudoamazonica, new species.
6 (1’) Segment IX with lateral processes elongated (Fig. 13 B; Flint 1981, figs 148–149).................................. 7
6’ Segment IX lateral processes not elongated (Figs 2 B; Flint 1974, fig 273)........................................ 10
7(6) Segment IX with lateral processes as long as half of tergum X (Denning 1951, fig. 1A)............. O. arizonica Denning.
7’ Segment IX with lateral processes almost as long as tergum X, if not, longer than half as long as tergum X (Fig. 13 B)..... 8
8 (7’) Segment IX with lateral processes long, branched, arising more nearly dorsally from segment IX (Denning & Sykora 1966, fig. 10).................................................................................. O. falicia Denning.
8’ Segment IX with lateral process unbranched, arising laterally from segment IX (Fig. 13 B)........................... 9
9 (8’) Segment IX with lateral processes decurved at tip; tergum X with dorsal part long and slender, ventral part with broad base and narrow apex; inferior appendages narrow at base and slightly broader at tip (Flint 1981, fig. 148)....... O. prolongata Flint.
9’ Lateral processes of segment IX straight; tergum X with dorsal part short and ventral part broad and membranous; inferior appendages broad at base and narrowed at tip (Fig. 13 B).......................................... O. rafaeli Flint.
10(6’) Inferior appendages each with dorsal preapical lobe rounded or digitate (Figs 2 B, 4B, 8B).......................... 11
10’ Inferior appendages each with shallow dorsal preapical lobe or without dorsal preapical lobe (Figs 3 B, 5B)............. 25
11(10) Inferior appendages each with dorsal lobe bearing digitate projections in dorsal margin or with dorsal margin irregular with strong spines (Figs 4 B, 8B)............................................................................ 12
11’ Inferior appendages each with dorsal lobe without digitate projections in dorsal margin, dorsal margin smooth (Figs 2 B).. 15
12(11) Inferior appendages each with dorsal lobe curved, hook-shaped (Bueno-Soria 1981, figs 8–9)....... O. silviae Bueno-Soria.
12’ Inferior appendages each with dorsal lobe straight or rounded (Figs 4 B, 8B)...................................... 13
13(12) Inferior appendages each with apical process apparently absent in lateral view, reduced to a small setose process before mid- line in ventral view (Fig. 4 B)........................................................ O. chipiriri, new species.
13’ Inferior appendages each with apical process digitate in lateral view (Fig. 8 B)..................................... 14
14(13’) Inferior appendages each with dorsal process broadened, apically bearing digitate small subequal lobes; apical process curved (Chen 1992, fig. 7.32A)................................................................ O. punctata (Navás).
14’ Inferior appendages each with dorsal process regularly broad from base to apex, apically bearing digitate small and broader lobes; apical process straight (Fig. 8 B)........................................................ O. knutsoni Flint.
15(11’) Inferior appendages each with dorsal lobe high (Fig. 2 B)..................................................... 16
15’ Inferior appendages each with dorsal lobe short (Figs 9 B, 10B, 14B)........................................... 22
16(15) Tergum X with dorsal process digitate or absent, shorter than inferior appendages (Fig. 2 B).......................... 17
16’ Tergum X with dorsal process slender, longer than or as long as inferior appendages (Flint 1974, fig. 271).............. 21
17(16) Tergum X with dorsal process (Fig. 2 B)................................................................... 18
17’ Tergum X with dorsal process absent (Denning & Sykora 1966, figs 9, 9A)...................................... 20
18 (17) Tergum X with ventral lobe inconspicuous, rounded at apex in lateral view (Bueno-Soria 1981, fig. 5)...................
.............................................................................. O. metlacensis Bueno-Soria. 18’ Ventral lobe of tergum X subtriangular in lateral view (Figs 2 B, Smith & Lehmkuhl 1980, figs 1, 3)................... 19
19(18’) Inferior appendages each with apical process digitate (Figs 2 B; Smith & Lehmkuhl 1980, fig. 3)......... O. avara (Banks).
19’ Inferior appendages each with apical process absent (Smith & Lehmkuhl 1980, fig. 1).............. O. disjuncta (Banks).
20(17’) Inferior appendages each with apical process inconspicuous (Denning & Sykora 1966, figs 9, 9A).................................................................................................... O. elata Denning & Sykora.
20’ Inferior appendages each with apical process slender, digitate (Bueno-Soria 1981, fig. 7)........ O. marquesi Bueno-Soria.
21(16’) Inferior appendages each with dorsal process slender, apically blunt, curved; apical process arising ventrally and pointed cau- dad; basal area normal not inflated (Flint 1974, fig. 271)......................................... O. bilobosa Flint.
21’ Inferior appendages each with dorsal process shallow and rounded; apical process apparently absent; basal area broad and inflated (Flint 1974, fig. 272)................................................................ O. inflata Flint.
22(15’) Phallic apparatus elongated twice the length of inferior appendages (Flint 1974, fig. 273)............. O. doesburgi Flint.
22’ Phallic apparatus short as long or shorter than inferior appendages (Fig. 14 B)..................................... 23
23(22’) Tergum X with dorsal digitate lobe and ventral subtriangular lobe with ventroapical indentation (Fig. 14 B).................................................................................................. O. traini, new species.
23’ Tergum X with dorsal lobe absent, ventral lobe variable but without ventroapical indentation (Fig. 9 B, 10B)............ 24
24(23’) Tergum X triangular in lateral view; inferior appendages each with apical process curved; margin between apical process and dorsal preapical process rounded (Fig. 9 B)............................................ O. oberdorffi, new species.
24’ Tergum X suddenly narrowed from midlength to tip; inferior appendages each with apical process straight; margin between apical process and dorsal preapical process angulated (Fig. 10 B)................................. O. paranensis Flint.
25(10’) Tergum X divided into a dorsal unique lobe and paired ventral lobes (Fig. 3 B).................................... 26
25’ Tergum X constituted only by paired lobe (Figs 5 B, 12B).................................................... 31
26(25) Tergum X with ventral paired lobes subtriangular (Fig. 3 B)................................................... 27
26’ Tergum X with ventral paired lobes rounded or digitate (Flint, 1974, fig. 269)................................... 30
27(26) Inferior appendages subtriangular, broad at base and narrowed at tip, twice as long as wide (Botosaneanu 1977, fig. 108).................................................................................. O. maspeluda Botosaneanu.
27’ Inferior appendages elongated, slightly broad at base and narrowed at tip 3 or more times as long as wide (Fig. 3 B)...... 28
28(27’) Tergum X with dorsal process half as long as ventral paired lobe; inferior appendages each with truncated apex (Fig. 3 B)................................................................................ O. carlibanezae, new species.
28’ Tergum X with dorsal lobe as long as ventral paired lobe; inferior appendages with acute or rounded apex (Flint 1967a, figs 108, 109)........................................................................................... 29
29(28’) Dorsal lobe of tergum X slightly broader at apex; inferior appendages each with apical process slightly downcurved, narrowed at tip with acute apex (Flint 1967a, figs 108, 109)........................................... O. peruviana (Banks).
29’ Dorsal lobe of tergum X digitate; inferior appendages with apical process directed dorsally, not narrowed at tip with rounded apex (Denning 1947, fig. 1A).............................................................. O. pratti Denning.
30(26’) Ventral lobe(s) of tergum X rounded; inferior appendages narrowed at tip with rounded apex (Flint, 1974, fig. 269)................................................................................................ O. scoparia Flint.
30’ Ventral lobe of tergum X slender; inferior appendages narrowed at the tip with acute apex (Ross 1944, fig. 822A)........................................................................................... O. cinerascens (Hagen).
31(25’) Tergum X fused with preanal appendages (Flint 1974, fig. 267)................................... O. connata Flint.
31’ Tergum X not fused with preanal appendages (Figs 5 B, 12B).................................................. 32
32(31’) Inferior appendages each with same with from base to tip (Flint 1983, fig. 250)........................ O. iguazu Flint.
32’ Inferior appendages each broad at base and narrowed from midlength to tip (Figs 5 B, 12B).......................... 33
33(32’) Tergum X broad at base and narrowed at tip, with digitate apical areal en lateral view (Fig. 5 B). O. dominguezi, new species.
33’ Tergum X broad from base to tip with rounded apex (Fig. 12 B).............................. O. punctipennis (Ulmer).
description: Published as part of 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, pp. 19-38 in Zootaxa 2821 on pages 35-36, DOI: 10.5281/zenodo.277232