Styringomyia youngi, Ribeiro, Guilherme Cunha, 2003

Ribeiro, Guilherme Cunha, 2003, Systematics of the Neotropical species of Styringomyia Loew (Diptera: Tipulomorpha: Limoniidae), Zootaxa 253, pp. 1-35 : 16-17

Styringomyia youngi sp. n.

MATERIAL EXAMINED. Holotype. Male, Ecuador: Zamora­Chinchipe, 84 km NW Zamora, mouth Rio Sabanilla (ca. 4º05S 79º01W), 1420m, 1 November 1987, C. Young, R. Davidson, J. Rawlins ( CMNH). Pinned specimen, with dissected terminalia inside microvial with glycerin pinned with the specimen. Paratypes. 4 males and 3 females, same data as holotype ( CMNH).

ETYMOLOGY. This species is named after Dr. Chen Young (Carnegie Museum of Natural History, Pittsburgh, USA), one of the collectors of the type specimens, and the person who made the Styringomyia specimens of CMNH collection available for this study.

DESCRIPTION. Dimensions. See table I. Morphology. Ninth sternite ( Fig. 28 ): narrowing gradually toward tip. Tenth tergite ( Fig. 19 ): posterior margin rounded. Gonocoxite ( Fig. 28 ): cylindrical proximally; distal part enlarged, bifurcated; dorsal branch with ca. five long and stout hairs along most distal parts of dorsal margin to apex; ventral branch with a ventral protuberance baring a usually short, curved and stout hair, and two long and stout hairs at apical margin; other hairs long and slender. Gonostylus ( Figs. 11 , 28 ): with three extensions; extension I weakly sclerotized, curved, narrowing gradually toward tip, bearing long and stout spine­like hair at its base; extension II ( Fig. 11 , II) weakly sclerotized, shorter than the others, bearing long and stout spine­like hair at its apex, extension III ( Fig. 11 , III) more sclerotized than the others extensions, curved, narrowing gradually toward tip. Aedeagal sheath ( Fig. 28 ): a pair of large lateral lobes present; dorsal crest three­pointed; medial point bidentate, posterior in relation to the others; ventral branches long, narrowing gradually toward tip. Female cercus: narrowing abruptly toward tip; ventral margin gently curved, not constricted.

Figures

FIGURE 28. Styringomyia youngi sp. n., holotype. Three­dimensional structure of terminalia, dorsolateral view. The arrow indicates the short and curved hair at the small protuberance near apex of ventral margin of gonocoxite. Abbreviations: aed, aedeagus; aed sh, aedeagal sheath; goncx, gonocoxite; gonst, gonostylus; S 9, ninth sternite, vb, ventral branches of aedeagal sheath.

FIGURES 18 ­ 25. Tenth tergite (male) of Neotropical Styringomyia species. 18. S. mystica, specimen from Peru (Madre de Dios). 19. S. youngi sp. n., holotype. 20. S. atlantica sp. n., paratype. 21. S. paulista, holotype (modified from Alexander, 1946). 22 S. simplex, specimen from Brazil (Mato Grosso, Diamantino). 23. S. maya sp. n., paratype. 24. S. amazonica sp. n., holotype. 25. S. manauara sp. n., paratype. Abbreviations: T 9, ninth tergite; T 10, tenth tergite.

FIGURES 10 ­ 13. Gonostylus of Neotropical Styringomyia species. Lateral and medial faces, respectively, on left and right sides of each figure. 10. S. mystica, holotype. 11. S. youngi sp. n., paratype. 12. S. atlantica sp. n., holotype. 13. S. paulista, holotype. The numbers refers to the homology system applied to the extensions of the gonostylus.