Mortoniella (Nanotrichia) paucispina, 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 : 99-100

Mortoniella (Nanotrichia) paucispina , new species

Fig. 84

This species is very similar to Mortoniella aries (Flint) , especially in the shape of the dorsal phallic spine, which is strongly reflexed apically and has subquadrate lateral wings. It can be distinguished by lacking the spiral processes present on the endophallic membrane in M. aries ; instead, it has a few scattered spines.

Adult —Length of forewing: male 2.6 mm. Forewing with forks I, II, and III present, fork II with short stalk, hind wing with fork II only; both wings narrow, acute apically. Spur formula 0:3:4. Tibial spurs short. Overall color (in alcohol) yellowish-brown (specimen faded and partially rubbed, wing bar not evident). Fore- and hind wings of male with scale-like setae paralleling major veins (except apically).

Male genitalia — Ventral process of segment VI posteriorly projecting, narrow basally, length about 2½ times width at base. Segment IX with anterolateral margin rounded and produced in ventral ½, posterolateral margin nearly straight; segment deeply mesally excised dorsally and ventrally, forming lateral lobes, separated dorsomesally by about ½ width of segment. Tergum X moderate in length, lateral margins subparallel; apex of tergum with deep U-shaped emargination, extending more than ½ length of tergum; apicolateral lobes not evident as such, formed by mesal invagination, apicolateral margin subtruncate; tergum, in lateral view, with ventrolateral lobes more or less continuous with apicolateral margin, not distinctly defined. Inferior appendages with short setose dorsolateral projections. Mesal pockets of inferior appendage with moderately elongate, posterodorsally curved, spine-like, apicoventral projections. Paramere appendage moderately elongate, narrow, nearly uniform in width, apex acute, extending slightly beyond apical inflection of dorsal phallic spine; basal segment of paramere rounded, with short spine-like projection from posterior margin. Phallobase with short ventral rod-like projections, not flared apically. Dorsal phallic spine, as viewed laterally, short, strongly upturned in about apical 1/3, apex subacute in lateral view, rounded in dorsal view; as viewed dorsally, with distinct lateral, wing-like, appendages in basal ½. Phallicata scarcely evident, very short and weakly sclerotized. Endophallic membrane with a couple of clusters of needle-like spines on either side (mostly in pairs); phallotremal spines absent.

Holotype male (alcohol)— PERU: Huánuco: 16.ix.1954, EL Schlinger and ES Ross ( UMSP000130031 ) ( CAS).

Etymology —The species is named M. paucispina, Latin for few-spined, in reference to the scattered (and generally paired) spines on the endophallic membrane of this species.

Figures

Figure 84. Mortoniella (Nanotrichia) paucispina, new species, male genitalia. A—lateral; B—segment IX and tergum X, dorsal; C—phallic ensemble, ventral; D—dorsal phallic spine and phallobase, dorsal; E—ventral process of segment VI, lateral.