Mortoniella (Mortoniella) bilineata Ulmer, 1906

Blahnik, Roger J. & Holzenthal, Ralph W., 2017, Revision of the northern South American species of Mortoniella Ulmer 1906 (Trichoptera: Glossosomatidae: Protoptilinae) *, Insecta Mundi 2017 (602), pp. 1-251 : 16-17

Mortoniella (Mortoniella) bilineata Ulmer, 1906

Fig. 3 , 105

Mortoniella bilineata Ulmer 1906: 97 ; Flint 1963: 466 [illustration]; Flint 1991: 22 [illustration, distribution]; Sykora 1999: 386 [member of bilineata subgroup]; Blahnik and Holzenthal 2008: 70 [member of bilineata group]; Blahnik and Holzenthal 2011: 62 [female genitalia (in error, actually M. hamata , n. sp.)].

This species is most similar to, and probably most closely related to M. paralineata Sykora. Both of these species have elongate ventral sclerites on the phallicata and inferior appendages with a short unbranched mesal projection. Mortoniella bilineata can be distinguished in that the sclerites of the phallicata are very elongate and project apically, and the ventral projection of the inferior appendage forms a sharply upturned, trianguloid process, as viewed laterally. The illustration of the female ( Fig. 105 ) is meant to replace the illustration provided in Blahnik and Holzenthal 2011, which is actually M. hamata , n. sp. The genitalia are very similar, but the ventrolateral processes of M. bilineata are perhaps slightly wider.

Adult —Length of forewing: male 4.5-4.8 mm; female 5.2 mm. Forewing with forks I, II, and III present, hind wing with forks II, III, and V. Spur formula 0:4:4. Overall color dark brown. Legs same color, tibial spurs darker, contrasting with legs. Palps and basal segments of antenna blackish-brown, base of antenna contrasting with subsequent whitish or light brown segments, apex of antenna dark brown (like wings). Forewing with 2 distinct white wing bars, 1 at anastomosis and 1 on proximal part of wing, approximately midway between base and anastomosis.

Male genitalia —Ventral process of segment VI posteriorly projecting, prominent, narrow basally, length about 2½ times width at base. Tergum VIII relatively narrow, subtending ventral margin of segment IX, membranous connection to tergum IX elongate. Segment IX with anterolateral margin rounded and produced in ventral half, posterolateral margin with distinctly angular projection in dorsal half; segment deeply mesally excised dorsally and ventrally, forming lateral lobes, separated dorsomesally by more than ½ width of segment. Tergum X elongate, lateral margins subparallel, laterally with acute, finger-like, lateral lobes, each with prominent apical seta; apex of tergum distinctly sclerotized, subtruncate, with ventrolateral margins incurved and converging mesally to form linear “seam,” apicodorsally with lightly sclerotized connection near apex (mesal notch nearly absent); tergum ventromesally with paired, rounded, lightly sclerotized, ventromesal lobes in basal half, each with short setae. Inferior appendages with short upright dorsolateral lobes, and single tapering ventromesal lobe; mesal lobe, as viewed laterally, short and strongly flexed at base, apex widened and subtruncate. Mesal pockets of inferior appendage with moderately elongate, sinuous, posteriorly-directed, spinelike, apicoventral projections. Paramere appendage elongate, narrow, nearly uniform in width, apex acute, extending about same length as dorsal phallic spine; basal segment of appendage articulating near base of dorsal phallic spine. Phallobase with evident rounded, laterally compressed, dorsomesal apodeme. Dorsal phallic spine, as viewed laterally, with dorsal margin strongly curved and arched from base, sinuously and nearly rectilinearly upturned in apical 1/4 or 1/5, apex of spine rounded; base of spine narrow, curved and stalk-like, abruptly and strongly widened on ventral margin at about basal 1/3, forming acute ventral projection, narrowing apically from projection; spine, as viewed dorsally, nearly uniformly narrow in width throughout length. Phallicata with sclerotized basodorsal projection, articulating with angular ventral projection of dorsal phallic spine, basodorsal projection with lateral margins forming short rounded lobes; phallicata ventrally with very elongate, narrow, projecting, sclerotized lobes, extending about same length as paramere appendages. Endophallic membrane simple in structure, with only weakly developed membranous lateral lobes; phallotremal spines absent.

Material examined — COLOMBIA: Antioquia: Quebrada El Aguelo, 2 km E El Retiro , 8.ii.1983, OS Flint, Jr– 1 male (pinned) ( NMNH) ; Km 50 Río Aurra , E San Jeronimo, 22.ii.1984, OS Flint, Jr – 1 female (pinned) ( NMNH) ; ECUADOR: El Oro: Pinas / Zaruma, Río La Calera , 19-20.viii.1977, LE Peña G – 1 male (pinned) ( NMNH) .

Distribution — Colombia, Ecuador.

Figures

Figure 3. Mortoniella (Mortoniella) bilineata Ulmer, male genitalia. A—lateral; B—segment IX and tergum X, dorsal; C—phallic ensemble, ventral; D—dorsal phallic spine, dorsal; E—ventral process of segment VI, lateral.

Figure 105. Mortoniella (M.) bilineata Ulmer, female genitalia. A—lateral; B—dorsal; C—ventral; D—glands of terga VI and VII.