Mortoniella brachyrhachos, Blahnik & Holzenthal, 2008

Blahnik, Roger J. & Holzenthal, Ralph W., 2008, Revision of the Mexican and Central American species of Mortoniella (Trichoptera: Glossosomatidae: Protoptilinae), Zootaxa 1711 (1), pp. 1-72 : 18-19

Mortoniella brachyrhachos , new species

Fig. 6

Mortoniella brachyrachos is perhaps most similar to M. florica (Flint) , resembling that species in possessing upright dorsolateral processes on the dorsal margin of the phallicata and in having a short inferior appendage without elongate apicolateral or apicomesal processes. It is distinguished from M. florica , and all other species, by its short, spinose paramere appendages.

Adult. Length of forewing: male 3.0– 3.2 mm. Forewing with forks I, II, and III, hind wing with forks II and III. Overall color (in glycerin) light brown. Ventral process of abdominal segment VI (male) short, ventrally oriented, subtriangular, subacute apically, length slightly greater than width at base, slightly constricted basally.

Male genitalia. Segment IX nearly evenly rounded anterolaterally, length greatest midlaterally, posterolateral margin forming rounded projection in dorsal half, narrowing ventrally; segment deeply mesally excised dorsally and ventrally, dorsal excision narrow, much less than half width of segment. Tergum X with prominent, acute mesal projection and short, angularly truncate lateral lobes, subequal in length to mesal projection, lateral lobes with apices distinctly sclerotized, dorsoventrally flattened and slightly mesally curved. Inferior appendage with weakly developed, acute apicomesal projection and short, rounded basolateral projections on each side; mesal pockets of inferior appendage with apical processes short, dorsally curved. Paramere appendages very short, dorsally curved and densely covered in apical half with short, thick spines. Dorsal phallic spine slightly enlarged basoventrally and with relatively weak apicodorsal inflection, distinctly dorsoventrally flattened; as viewed dorsally, with apex rounded. Phallicata relatively short, dorsally with explanate lateral projection on either side, each rounded and slightly elevated basally, tapering apically. Endophallic membrane with single prominent, stout, curved spine.

Holotype male: MEXICO: Oaxaca: Loxicha, Pluma Hidalgo, 450 m, 20.x.1982, J. Bueno-Soria ( UMSP000118956 ) (in microvial of glycerin, on pin) ( IBUNAM).

Paratypes: MEXICO: Oaxaca: same locality and date as holotype, 1 male (in microvial of glycerin, on pin) ( IBUNAM) .

Etymology. This species is named M. brachyrhachos , as a noun in apposition, from Greek words for short stem, referring to the short setose paramere appendages of this species.

Figures

FIGURE 6. Mortoniella brachyrhachos, new species. Male genitalia: A—lateral; B—segment IX and tergum X, dorsal; C—phallic ensemble, ventral; D—dorsal phallic spine and parameres, dorsal; E—ventral process of sternum VI, lateral.