Maietta squamigera Alexander, 1929

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 : 333-334

Maietta squamigera Alexander, 1929

( Figs 1a , 3 , 5a , 6a , 7a , 8a , 9a , 10a )

Maietta squamigera Alexander, 1929: p. 185 (description), fig. 104 (wing), fig. 233 (male terminalia), fig. 234 (female terminalia).

Material examined: Holotype. Maietta squamigera Al. Det. C. P. Alexander , male, Chile, Chiloé Is., Mechuque Is. [42° 18’ S, 73° 16’ W], 23-XII-1926, F. & M. Edwards , Holotype ( USNM). Part of specimen pinned and part in slide prepared by Charles Paul Alexander . Paratype. Specimen in slide prepared by Charles Paul Alexander: Maietta squamigera Al. Det. C. P. Alexander , male, Chile, Chiloé Is., Ancud [41° 52’ S, 73° 48’ W], 18-XII-1926, F. & M. Edwards , Paratype ( USNM) . Material identified by Charles Paul Alexander. Pinned specimens: Maietta squamigera Al. Det. C. P. Alexander , 2 males, Chile, Arauco, Nahuelbuta , Butamalal [37° 49’ S, 73° 14’ W], 1100–1400 m, 23/ 31-I-1954, Luis Peña ( USNM) ; Maietta squamigera Al. Det. C. P. Alexander , male, Chile, Arauco, Nahuelbuta, Pichinahuel [37° 48’ S, 73° 02’ W], 1100–1400 m, 23/ 31-I-1954, Luis Peña ( USNM) . Maietta squamigera Al. Det. C. P. Alexander , female, Chile, Chiloé Is., Aucar [42° 10’ S, 73° 30’ W], 6/ 15-I-1952, Luis Peña ( USNM) . Specimens in slides prepared by Charles Paul Alexander: Maietta squamigera Al. Det. C. P. Alexander , female, Chile, Arauco, Nahuelbuta , Butamalal [37° 49’ S, 73° 14’ W], 1100–1400 m, 23/ 31-I-1954, Luis Peña, Met. 129 ( USNM) ; Maietta trimedia Al. Det. C. P. Alexander , male, Chile, Arauco, Pillim Pilli [37° 46′ S, 73° 04′ W], 600-800 m, 15- I-1954, Peña ( USNM) ; Maietta squamigera Al. Det. C. P. Alexander , 1 female and 2 [sex unknown], Chile, Chiloé Is., Aucar [42° 10’ S, 73° 30’ W], 6/ 15-I-1952, Peña ( USNM) .

Diagnosis. Wing with only 2 medial veins. Pedicel as long as scape. Vein M 1+2 twice as longer as r-m.

Description. Head. Scape ca. 1.3 times longer than wide. Pedicel similar to scape in length (autapomorphic feature). Pedicel as long as first flagellomere. Penultimate flagellomere ca. 1.1 times longer than last one ( Fig. 5a ).

Thorax. Thoracic sclerites shown in Fig. 6a . Wing shown in Fig. 1a , Fig. 3a , and Fig. 7a . Vein Sc ending at level of R 2+3. Vein R 2 3 times longer than vein R 2+3. Length of vein R 2+3+4 2.3 times longer than vein R 2+3. First section of vein R 5 1.9 times longer than cross-vein r-m. First section of vein M 1+2 3.2 times longer than cross-vein r-m. Two medial veins present. Distance between M 1+2 and R 5 smaller than distance between M 3+4 and M 1+2.

Female terminalia. Female tergite X 1.6 times longer than wide. Dorsal margin of tergite X with a projection. Cercus tilted up, 1.8 times smaller than length of tergite X. Ventral margin of tergite IX 2.7 times longer than dorsal margin. Dorsal projection of sternite IX angulated. Posterior projection of sternite IX zigzagged. Hypogynial valves almost circular, 1.1 times longer than wide and less wide than sternite IX ( Fig. 8a ).

Male terminalia. Male terminalia illustrated in Fig. 9a (Details of chaetotaxy shown in Fig 10a ). Gonocoxite 1.6 times longer than lobe of gonostylus and 1.4 times longer than clasper of gonostylus. Parameres with concave anterior margin. Sheath of aedeagus with bifid projection with very small tips. Bridge between interbases as wide as aedeagus. Long tip of the bifid posterior projection of interbases four times longer than the short tip. Both projections of dorsal interbase pointing to the right.

Coloration. General coloration brown. Head: brown with few dark punctures. Rostrum brown, palpi brown. Antennae yellowish brown with outer segments light brown. Thorax: Pronotum yellowish brown, pleuron testaceous yellow. Halters pale yellow with base and knob copper. Wings hyaline, scales brown, veins nearly hyaline. Coxae and trochanters testaceous, femora pale with apices testaceous. Abdomen brown.

Remarks. One specimen of this species was misidentified by C. P. Alexander as M. trimedia Alexander.

Figures

FIGURE 1. Habitus of Maietta. All specimens male. a: Maietta squamigera Alexander, 1929; b: Maietta trimedia Alexander, 1967.

FIGURE 3. Wing of Maietta squamigera Alexander, 1929 (male). a: tip of the wing; b: scales in detailed view.

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.