Maietta trimedia Alexander, 1967,

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: 335-337

publication ID

https://doi.org/10.11646/zootaxa.4695.4.2

publication LSID

lsid:zoobank.org:pub:71B14DB7-C986-4323-A963-B4CF64F03A9E

persistent identifier

http://treatment.plazi.org/id/126187F4-FFD2-FFA1-18AF-1108FAE2E115

treatment provided by

Plazi

scientific name

Maietta trimedia Alexander, 1967
status

 

Maietta trimedia Alexander, 1967 

( Figs 1bView FIGURE 1, 2View FIGURE 2, 4View FIGURE 4, 5bView FIGURE 5, 6bView FIGURE 6, 7bView FIGURE 7, 8bView FIGURE 8, 9bView FIGURE 9, 10bView FIGURE 10)

Maietta trimedia Alexander, 1967, p. 493  (description); Alexander, 1968 (fig. 19: wing, fig. 20: male terminalia).

Material examined: Holotype. Maietta trimedia Al. Det. C. P. Alexander  , male, Chile, Chiloé Is., Chepu [42° 02’ S, 74° 01’ W], 10/ 14-II-1952, Peña, Holotype 9618 ( USNM). Part of specimen pinned and part in slide prepared by Charles Paul Alexander. Paratypes. Pinned specimens: Maietta trimedia Al. Det. C. P. Alexander  , 1 male and 1 female, Chile, Arauco, Nahuelbuta [37° 46’ S, 72° 59’ W], 5/10/- I-1953, Luis E. Peña ( USNM). Allotype. Pinned specimen: Maietta trimedia Al. Det. C. P. Alexander  , female, Chile, Chiloé Is., Aucar [42° 10’ S, 73° 30’ W], 15-I- 1952, Luis Peña ( USNM). Material identified by Charles Paul Alexander. Pinned specimens: Maietta trimedia Al. Det. C. P. Alexander  , 3 male, 3 female and 3 [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  , 5 male and 1 [sex unknown], Chile, Arauco, Nahuelbuta, Pichinahuel [37° 48’ S, 73° 02’ W], 1100–1400 m, 23/ 31-I-1954, Luis Peña ( USNM); female, Chile, Chiloé Is., Aucar [42° 10’ S, 73° 30’ W], 6/ 15-I-1952, Peña ( USNM). Specimens in slides prepared by Charles Paul Alexander: 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 trimedia Al. Det. C. P. Alexander  , 1 male and 1 female, Chile, Arauco, Nahuelbuta, Butamalal [37° 49’ S, 73° 14’ W], 1100–1400 m, 23/ 31-I-1954, L. E. Peña ( USNM); Maietta trimedia Al. Det. C. P. Alexander  , male, Chile, Arauco, Caramavida [37° 40’ S, 73° 20’ W], 1100–1400 m, 23/ 31-I-1954, Peña ( USNM); Maietta trimedia Al. Det. C. P. Alexander  , female, Chile, Chiloé Is., Aucar [42° 10’ S, 73° 30’ W], 1100–1400 m, 23/ 31-I-1954, Peña ( USNM).

Diagnosis. Last flagellomere longer than the penultimate. Dorsal margin of female tergite IX as long as the ventral margin. Parameres divergent. In addition, this species has the largest anepisternum and the smallest laterotergite found in the genus.

Description. Head. Scape 1.7 times longer than wide. Pedicel almost circular, 1.2 times longer than wide. Scape as long as pedicel. Pedicel 2 times longer than first flagellomere. Last flagellomere 1.7 longer than penultimate flagellomere (autapomorphic feature) ( Fig. 5bView FIGURE 5).

Thorax. Thoracic sclerites shown in Fig. 6bView FIGURE 6. Wing shown in Fig. 7bView FIGURE 7. Vein Sc ending near the level R 2 branches from R 1. Vein R 2 4 times longer than vein R 2+3. Length of vein R 2+3+4 2.7 times longer than vein R 2+3. First section of vein R 5 1.5 times longer than cross-vein r-m. First section of vein M 1+2 1.9 times longer than cross-vein r-m. Three medial veins present. Vein M 3+4 1.1 times longer than M 4, 2 times the length of cross-vein m-cu. Distance between M 1+2 and R 5 shorter than distance between R 4 and R 5 and distance between M 3 and M 1+2.

Female terminalia. Female tergite X 1.6 times longer than wide. Dorsal margin of tergite X without projections. Cercus straight, 1.9 times shorter than length of tergite X. (A small cercus in this species is homoplastic with the clade 4 in Fig. 11View FIGURE 11). Ventral margin of tergite IX 1.1 times longer than dorsal margin. Dorsal projection of sternite IX angulated. Hypogynial valves almost circular, 1.1 times wider than long and as wide as sternite IX. Posterior projection of sternite IX stretched out ( Fig. 8bView FIGURE 8).

Male terminalia. Male terminalia illustrated in Fig. 9bView FIGURE 9 (details of chaetotaxy shown in Fig. 10bView FIGURE 10). Gonocoxite 1.9 times longer than lobe of gonostylus and 1.6 times longer than the clasper of gonostylus. Parameres with pointed lateral margin. Sheath of aedeagus with bifid projection with tips as long as the extremities. Bridge between interbases wider than aedeagus. Long tip of bifid posterior projection of interbases 2.3 times longer than the short tip. Projections of the interbase divergent, i.e. the left interbase pointed to the left and right interbase pointed to the right.

Coloration. General coloration dark brown. Head: dark brown. Rostrum dark brown, palpi dark brown. Antennae obscure yellow with outer segments darker. Thorax: dark brown, pleuron brown. Halters yellowish white. Coxae brown, trochanters obscure yellow, remainder of legs pale. Wings hyaline, scales light brown, veins nearly hyaline. Abdomen dark brown.

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

USNM

Smithsonian Institution, National Museum of Natural History

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Diptera

Family

Limoniidae

Genus

Maietta

Loc

Maietta trimedia Alexander, 1967

Santos, Daubian, Santos, Rodrigo Dos Reis & Ribeiro, Guilherme Cunha 2019
2019
Loc

Maietta trimedia Alexander, 1967 , p. 493

Alexander. Hitherto 1967: 493
1967