Mortoniella pumila, Blahnik & Holzenthal, 2011

Blahnik, Roger J. & Holzenthal, Ralph W., 2011, Revision of the austral South American species of Mortoniella (Trichoptera: Glossosomatidae: Protoptilinae) 2851, Zootaxa 2851 (1), pp. 1-75 : 41-43

Mortoniella pumila , new species

Fig. 20

This is a distinctive species, similar only to M. pusilla , n. sp. Both species have a distinctively shaped phallic spine, very broad in the middle as viewed laterally, and sharply upturned apically. Mortoniella pumila is most readily distinguished from M. pusilla by its longer paramere appendages. These are distinctly longer than the dorsal phallic spine in M. pumila , bowed upward, and distinctly shorter than the dorsal phallic spine in M. pusilla . Other differences include a shorter apicolateral, seta-bearing process on tergum X, a less pronounced mesal notch of tergum X, a dorsal process of the phallotheca that is more upright, and a longer and distinctly acute spine on the endophallic membrane. The dorsal phallic spine in M. pumila is also more distinctly upturned and its apical part narrower and more acuminate than M. pusilla (dorsal view). The latter character may be somewhat variable, but was especially evident in the site where the 2 species were found sympatrically.

Adult. Length of forewing: male 2.0– 2.8 mm, female 2.3–2.9 mm. Forewing with forks I, II, and III present, hind wing with fork II only. Spur formula 0:3:4. Overall color light brown. Legs light brown, apices of tarsi whitish, tibial spurs somewhat darker than legs, but not strongly contrasting in color. Antennae with apical part of basal segments whitish. Wing bar at anastamosis distinct, marked with whitish setae.

Male genitalia. Ventral process of segment VI laterally compressed, ventrally projecting, subtriangular, length greater than width at base, acute to subacute apically. Segment IX nearly evenly rounded anterolaterally, length greatest midlaterally, posterolateral margin convexly rounded, narrowing ventrally; segment deeply excised dorsomesally and ventromesally, forming lateral lobes, lobes separated dorsomesally by much less than 1/2 width of segment. Tergum X with mesal margin very shallowly, concavely incised, lateral lobes only weakly developed, apices broadly rounded in dorsal view, each with single, prominent ventrolateral seta. Inferior appendages without apicomesal projection; laterally, on each side, with short, setose, dorsally-directed lobes, apices of lobes subacute. Mesal pockets of fused inferior appendages with apical processes prominent, posteriorly curved, distinctly projecting beyond inferior appendages. Paramere appendages elongate (as long or longer than dorsal phallic spine), narrow, mesally curved, slightly widened preapically, apices acute; in dorsal view strongly mesally curved preapically. Dorsal phallic spine, as viewed laterally, distinctly upturned in apical 1/2, apex narrowed and acute, spine very distinctly, bulbously enlarged in middle. Phallicata short, tubular, with prominent, sclerotized, raised, anteriorlydirected, dorsomesal process subtending dorsal phallic spine; ventral margin weakly sclerotized, somewhat protruding. Endophallic membrane apparently short and simple in structure, with short, stout, curved ventromesal spine; phallotremal spines absent.

Holotype male: BRAZIL: Rio de Janeiro: Encontro dos Rios (Macaé/Bonito), 6 km S Lumiar , 22°23'29"S, 042°18'42"W, 600 m, 10.iii.2002, Holzenthal, Blahnik, Paprocki & Prather ( UMSP000088069 ) (pinned) ( MZUSP).

Paratypes: BRAZIL: Minas Gerais: Parque Estadual de São Gonçalo do Rio Preto, Córrego das Eguas , 18°08'43"S, 043°22'09"W, 891 m, 14.x.2000, Paprocki, Amarante & Isaac — 1 male (alcohol) ( UMSP) ; Rio Santo Antônio, downstream from Morro do Pilar , 19°08'08"S, 043°21'15"W, 530 m, 17.x.2000, Paprocki & Ferreira — 18 males, 74 females (alcohol) ( UMSP) ; Corrego Pitanga in Braúnas , 19°03'25"S, 042°43'05"W, 353 m, 18.x.2000, Paprocki & Ferreira — 1 male, 3 females ( UMSP) ; Corrego Pitanga, upstream of confl. with Rio Santo Antônio , 19°05'40"S, 042°39'54"W, 238 m, 19.x.2000, Paprocki & Ferreira — 15 males (alcohol) ( UMSP) ; Rio de Janeiro: same locality and date as holotype — 1 male, 5 females (pinned) 23 males, 54 females (alcohol) ( MZUSP, UMSP, NMNH) .

Etymology. This species is named M. pumila from the Latin word pumilis, meaning diminutive or little, and referring to the diminutive size of this species.

Figures

FIGURE 20. Mortoniella pumila, new species, male genitalia: A—lateral; B—segment IX and tergum X, dorsal; C—phallic ensemble, ventral.