Oecetis chipiriri Martín, Gibon & Molina, 2011, new species

Oecetis chipiriri, new species

Fig. 4

This species is most similar to O. knutsoni Flint (1981). The pattern of forewing spots is similar in the 2 species, but the total size of the wings is different. Segment IX is narrow in both species, but tergum X is more developed in the new species. The structure of the inferior appendages is similar in the 2 species but in the new species the dorsal process of each inferior appendage is rounded and bears spines arising from small projections of dorsal margin whereas in O. knutsoni the apical area of the dorsal process bears digitate projections.

Specific diagnosis. The new species is characterized firstly by the mesoventral lobe of the inferior appendage, which is rounded and bearing strong spines, and secondly by a well-developed segment X.

Adult. Length of each forewing: 7 mm. Forewing with R2+3 without petiole. Forewings with black spots in membrane at forks, junctions, and at apical ends of veins. Forewing broadest toward rounded apex (Fig. 4 A).

Male genitalia. Segment IX annular and narrow, slightly broadly produced anteromesolaterally, with pair of mesodorsal knobs present in lateral view. Preanal appendages with subacute apices. Tergum X broad at base and narrowed at tip, with rounded extremity bearing setae in lateral view (Fig. 4 B); divided into 2 structures: Dorsal paired short portion and ventral subtriangular portion with broad medial V–shaped excision in dorsal view (Fig. 4 C). Inferior appendages short, each with quadrangular base and lateral lobe with rounded setose apex in lateral view (Fig. 4 B); curved and concave with apical lobe broadened at tip and bearing strong setae, posterior margin with small setose process before midline in ventral view (Fig. 4 D). Phallic apparatus short, curved, with phallotremal sclerite in dorsal fold near apical extremity in lateral view (Fig. 4 E); apex crenellated with medial V–excision and with phallotremal sclerite subtriangular in dorsal view (Fig. 4 F).

Holotype male. BOLIVIA: Cochabamba: Small tributary of the Río Espiritu Santo, Chipiriri, near Villa Tunari, 16°50'45''S, 65°25'33''W, 25.ix.2003, (IML).

Paratypes. same data as holotype, (CBF-UMSA) ― 23 males, 27 females.

Etymology. The name of this species refers to the type locality.