Mortoniella ormina ( Mosely, 1939 )

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 : 53

Mortoniella ormina ( Mosely, 1939)

Fig. 26

Mexitrichia ormina Mosely, 1939: 222 .

Mortoniella ormina (Mosely) ; Blahnik & Holzenthal 2008; 70 [ M. ormina species group].

This species most closely resembles M. alicula , n. sp., particularly in the structure of its dorsal phallic spine, which has it apex distinctively narrowed, upturned and posteriorly curved. However, among other differences, in M. ormina , the phallic spine is not nearly so widely explanate preapically and the paramere appendages are much shorter.

Adult. Length of forewing: male 1.8-2.0 mm, female 2.1-2.5. Forewing with forks I, II, and III present, hind wing with fork II only. Spur formula 0:3:4. Overall color (in alcohol) pale yellowish-brown, appendages pale, without pigmentation. Wing bar at anastamosis evident in some specimens.

Male genitalia: Ventral process of segment VI posteriorly projecting, elongate, narrow, length more than 2 times width at base, apex acute ( Fig. 26D ). Segment IX rounded anterolaterally, length greatest in ventral 1/2, posterolateral margin weakly, convexly rounded in dorsal 1/2, narrowing ventrally; segment deeply excised dorsomesally and ventromesally, forming lateral lobes, lobes separated dorsomesally by 1/2 or more width of segment. Tergum X moderately elongate, simple in structure, with very deep, narrow, V-shaped mesal excision; apical lobes rounded, as viewed both laterally and dorsally. Inferior appendages very small, inconspicuous, with acute posterior projection. Mesal pockets of fused inferior appendages with apical processes short, posterodorsally curved, extending beyond inferior appendages. Paramere appendages moderate in length, extending about as far as dorsal phallic spine, uniformly narrow in width, acute apically. Dorsal phallic spine of distinctive structure, somewhat widened at middle, strongly dorsally curved in apical 1/4th, apex abruptly narrowed and posteriorly recurved. Phallicata bulbous, lightly sclerotized, dorsally with mesal, posteriorly-directed, spine-like process. Endophallic membrane short, simple in structure, with lightly sclerotized, rounded to subquadrate lateral processes; ventral spine and phallotremal spines absent.

Material examined. BRAZIL: Santa Catarina: Nova Teutonia , 27°03'S, 052°24'W, i.1964, F Plaumann — 12 males, 35 females (alcohol) ( NMNH, UMSP) .

Distribution. Brazil.

Figures

FIGURE 26. Mortoniella ormina (Mosely), male genitalia: A—lateral; B—segment IX and tergum X, dorsal; C—dorsal phallic spine, dorsal; D—ventral process of segment VI, lateral.