Maietta edwardsi, Santos & Santos & Ribeiro, 2019

Santos, Daubian, Santos, Rodrigo Dos Reis & Ribeiro, Guilherme Cunha, 2019, Systematics of the genus Maietta Alexander with description of three new species (Diptera: Tipulomorpha: Limoniidae), Zootaxa 4695 (4), pp. 331-350 : 339

Maietta edwardsi sp. n.

( Figs 5d , 6d , 7d , 8d , 9d , 10d )

Material examined. Holotype. Pinned specimen, male. Chile, Arauco, Pichinahuel [37° 48’ S, 73° 02’ W], 1100– 1400 m, 23/ 31-I-1954, Peña ( USNM) (The specimen designated here as the holotype of this new species was misidentified by Charles Paul Alexander as Maietta squamigera Alexander. Material identified by Charles Paul Alexander . Pinned specimens: Maietta squamigera Al. Det. C. P. Alexander , male, Chile, Arauco, Nahuelbuta, Butamalal [37° 49’ S, 73° 14’ W], 1100–1400 m, 23/ 31-I-1954, Peña ( USNM) ; Maietta trimedia Al. Det. C. P. Alexander , 2 male and 1 [sex unknown], Chile, Arauco, Nahuelbuta, Butamalal [37° 49’ S, 73° 14’ W], 1100–1400 m, 23/ 31-I-1954, Peña ( USNM) ; Maietta trimedia Al. Det. C. P. Alexander , 1 male and 1 [sex unknown], Chile, Arauco, Nahuelbuta [37° 46’ S, 72° 59’ W], 5/ 10-II-1953, Luis E. Peña ( USNM) ; Maietta squamigera Al. Det. C. P. Alexander , [sex unknown], Chile, Arauco, Nahuelbuta, Pichinahuel [37° 48’ S, 73° 02’ W], 1100–1400 m, 23/ 31-I-1954, Luis Peña ( USNM) . Specimens in slides prepared by Charles Paul Alexander: Maietta squamigera Al. Det. C. P. Alexander , male, Chile, Arauco, Nahuelbuta, Butamalal [37° 49’ S, 73° 14’ W], 1100–1400 m, 23/ 31- I-1954, Peña ( USNM) ; Maietta trimedia Al. Det. C. P. Alexander , 2 male and 1 female, Chile, Arauco, Nahuelbuta, Butamalal [37° 49’ S, 73° 14’ W], 1100–1400 m, 23/ 31-I-1954, Peña ( USNM) ; Maietta trimedia Al. Det. C. P. Alexander , female, Chile, Arauco, Pillim Pilli [37° 46′ S, 73° 04′ W], 500–800 m, 15-I-1954, Peña ( USNM) ; Maietta trimedia Al. Det. C. P. Alexander , 1 female and 1 male, Chile, Chiloé Is., Aucar [42° 10’ S, 73° 30’ W], 6/ 15-I-1952, Peña ( USNM) ; Maietta trimedia Al. Det. C. P. Alexander , male, Chile, Arauco, Nahuelbuta, Pichinahuel [37° 48’ S, 73° 02’ W], 1100–1400 m, 29/ 31-I-1959, Luis Peña ( USNM).

Etymology. The species is named after Frederick Wallace Edwards, an important entomologist that studied crane flies and others insects. The genus Maietta was named in honor of his wife, Florence Mary (“May”) Edwards.

Diagnosis. Vein Sc ending proximal to the first section of r-m. Subalar sclerite with a medial projection. Interbases convergent.

Description. Head. Scape more cylindrical, 3.6 times longer than wide. Pedicel with a distal constriction, as long as wide. Scape 2.2 times longer than pedicel. Pedicel 1.3 times longer than first flagellomere. Penultimate flagellomere 1.1 longer than last one. Antennae 2.8 times longer than palpi ( Fig. 5d ).

Thorax. Thoracic sclerites shown in Fig. 6d . Wing shown in Fig. 7d . Vein Sc ending proximal to R 2+3 and on the same level as the end of CuP. Vein R 2 angulated and approximately 2.7 times longer than vein R 2+3. Vein R 2+3+4 2.7 times longer than vein R 2+3. Cross-vein r-m 2.3 times longer than first section of vein R 5. First section of vein M 1+2 1.4 times longer than cross-vein r-m. Three medial veins present. Vein M 3+4 longer than M 4, 3.5 times the length to cross-vein m-cu. Distance between M 1+2 and R 5 bigger than distance between R 4 and R 5 whose distance is bigger than distance between M 3 and M 1+2.

Female terminalia. Female tergite X 2 times longer than wide. Dorsal margin of tergite X with no projections. Cercus a little inclined downward and almost half the length of tergite X. Ventral margin of tergite IX 2.4 times longer than dorsal margin. Dorsal projection of sternite IX straight. Hypogynial valves almost circular, 1.1 times longer than wide, and less wide than sternite IX. Posterior projection of sternite IX more stretched out ( Fig. 8d ).

Male terminalia. Male terminalia illustrated in Fig. 9d (Details of chaetotaxy shown in Fig. 10d ). Gonocoxite 1.6 times longer than lobe and the clasper of gonostylus, which are similar in length. Parameres with a concave lateral margin. Sheath of aedeagus with a bifid projection. Size of its 2 tips is 2.4 times smaller than the size of projection. Bridge between interbases wider than aedeagus. Long tip of bifid posterior projection of interbases almost 2 times longer than the short tip. Both projections of the interbase pointed to the center in a convergent pattern, i.e. the right interbase pointing to the left and the left interbase pointing to the right ( Fig. 12 ).

Coloration. General coloration reddish brown. Head: dark brown. Rostrum dark brown, palpi dark brown. Antennae brown. Thorax: reddish brown, pleuron testaceous. Halters brownish yellow. Coxae and trochanters yellowish brown, remainder of legs light brown Wings hyaline, scales light brown, veins nearly hyaline. Abdomen reddish brown.

Remarks. Some specimens of this new species were misidentified by C. P. Alexander as M. trimedia Alexan- der, and as M. squamigera Alexander.

Figures

FIGURE 5. Head of Maietta (frontal view). All specimens male. a: Maietta squamigera Alexander, 1929; b: Maietta trimedia Alexander, 1967; c: Maietta dextra sp. n.; d: Maietta edwardsi sp. n.; e: Maietta sinistra sp. n. Abbreviations: ant, antenna; ped, pedicel; plp, palpus; scp, scape.

FIGURE 6. Thorax of Maietta (lateral view). All specimens male. a: Maietta squamigera Alexander, 1929; b: Maietta trimedia Alexander, 1967; c: Maietta dextra sp. n.; d: Maietta edwardsi sp. n.; e: Maietta sinistra sp. n. Abbreviations: anepm, anepimeron; anepst, anepisternum; aprn, anteropronotum; cerv scl, cervical sclerite; cx, coxa; hlt, halter; kepm, katepimeron; kepst, katepisternum; mr, meron; mtanepst, metanepisternum; mtepm, metepimeron; mtg, mediotergite; mtn, metanotum; p bas, posterior basalare; patg, paratergite; pprn, pospronotum; presct, prescutum; s scl, subalar sclerite; sct, scutum; sctl, scutellum.

FIGURE 7. Wing of Maietta (lateral view). All specimens male. a: Maietta squamigera Alexander, 1929; b: Maietta trimedia Alexander, 1967; c: Maietta dextra sp. n.; d: Maietta edwardsi sp. n.; e: Maietta sinistra sp. n.

FIGURE 8. Female terminalia of Maietta (lateral view). a: Maietta squamigera Alexander, 1929; b: Maietta trimedia Alexan- der, 1967; c: Maietta dextra sp. n.; d: Maietta edwardsi sp. n.; e: Maietta sinistra sp. n. Abbreviations: dp, dorsal projection; cer, cercus; hyp val, hypogynial valve; pp, posterior projection; st, sternite; tg, tergite.

FIGURE 9. Line drawings of the male terminalia of Maietta (dorsal view). a: Maietta squamigera Alexander, 1929; b: Maietta trimedia Alexander, 1967; c: Maietta dextra sp. n.; d: Maietta edwardsi sp. n.; e: Maietta sinistra sp. n. Abbreviations: aed, aedeagus; c gonst, clasper of gonostylus; goncx, gonocoxite; int, interbase; l gonst, lobe of gonostylus; prm, paramere; sh aed, sheath of aedeagus.

FIGURE 10. Photographs of the male terminalia of Maietta (dorsal view). a: Maietta squamigera Alexander, 1929; b: Maietta trimedia Alexander, 1967; c: Maietta dextra sp. n.; d: Maietta edwardsi sp. n.; e: Maietta sinistra sp. n.

FIGURE 12. Scheme of the evolution of the interbases. The two quarter circles represent the shape patterns of the interbases throughout the evolution of the genus. Letters in the figure correspond to the recovered clades as in Fig. 11. Illustrations of the interbases are placed above the corresponding species name.