Mortoniella (Mortoniella) bulbosa, Blahnik & Holzenthal, 2017

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 : 17-18

Mortoniella (Mortoniella) bulbosa , new species

Fig. 4

Mortoniella n. sp. 1: Flint 1996: 383.

This species can be distinguished from others in the bilineata subgroup by the distinctive form of the inferior appendages, which have a bulbous, microsetose, ventromesal projection, which forks apically into 2 narrow, hooked processes, each with 1 or 2 branches. The females listed as additional examined material closely resemble the associated female of M. bulbosa , but are not included in the paratype material, since they were collected from different localities. The female genitalia generally resemble other examined females in the bilineata subgroup, except that the anterior extension of tergum IX is somewhat shorter and pheromone sacks are absent on both terga VI and VII.

Adult — Length of forewing: male 3.4 mm; females 5.7-6.8. Forewing with forks I, II, and III present, hind wing with forks II, III, and V. Spur formula 0:4:4. Overall color (in alcohol) yellowishbrown. Tibial spurs darker, contrasting with legs. Forewing of male without evident wing bars (in alcohol), but anastomosis evident due to unpigmented crossveins. Pinned females dark brown with 2 evident white wing bars.

Male genitalia —Ventral process of segment VI prominent, posteriorly projecting, narrow basally, length about 3 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, margins rounded laterally, subparallel in demarcated dorsal region, laterally with acute, finger-like, lateral lobes, each with prominent apical seta and one or more preapical setae; apex of tergum distinctly sclerotized, bluntly rounded apically, with ventrolateral margins incurved and converging mesally to form linear “seam,” apicodorsally with lightly sclerotized connection near apex (mesal notch very narrow and shallow); tergum ventromesally with paired, rounded, lightly sclerotized, ventromesal lobes in basal half, each with short setae. Inferior appendages with short, upright, dorsolateral lobes and bulbous ventromesal lobe with minute microsetae, lobe divided apically to form pair of narrow processes (forked or unforked). Mesal pockets of inferior appendage with moderately elongate, sinuous, posteriorly-directed, spinelike apicoventral projections. Paramere appendage short, narrow, nearly uniform in width, apex acute, extending slightly more than ½ length of 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, apex of spine rounded; base of spine narrow, curved and stalk-like, abruptly and strongly widened on ventral margin at midlength, forming acute ventral projection; spine, as viewed dorsally, nearly uniformly narrow in width (very slightly widened at apical inflection). Phallicata with sclerotized basodorsal projection, articulating with angular ventral projection of dorsal phallic spine, phallicata ventrally with paired sclerotized lobes, extending about same length as apical inflection of dorsal phallic spine, lobes very broadly rounded basally; as viewed ventrally, narrowed and rounded apically. Endophallic membrane simple in structure, with only weakly developed, membranous, lateral lobes; phallotremal spines absent.

Holotype male (alcohol)— PERU: Madre de Dios: Manu, Erika (near Salvación), 550 m, 4- 6.ix.1988, O Flint and N Adams ( UMSP000097104 ) ( MJP).

Paratypes — PERU: Madre de Dios: same data as Holotype – 1 female (pinned) ( NMNH).

Additional material examined — PERU: Cuzco: Paucartambo, Puente San Pedro , ca. 50 km NS Pilcopata, 1600 m, 2-3.ix.1988, O Flint and N Adams– 1 female (pinned) ( NMNH) ; Paucartambo, Quinta Calzon, ca. 30 km NW Pilcopata, Km 164, 13.15000° S, 71.36667° W, 1030 m, 1-2.ix.1989, N Adams, et al.– 1 female (pinned) ( NMNH) .

Etymology— This species is named M. bulbosa for the bulbous ventromesal lobe of the inferior appendage, which character easily distinguishes it from closely related species.

Figures

Figure 4. Mortoniella (Mortoniella) bulbosa, new species, 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.