Amphineurus (Rhamphoneurus) rutristylus Alexander, 1968

Santos, Daubian, Santos, Rodrigo dos Reis & Ribeiro, Guilherme Cunha, 2022, Systematics of Amphineurus (Rhamphoneurus Alexander) (Diptera: Tipuloidea: Limoniidae), Arthropod Systematics & amp; Phylogeny 80, pp. 439-494 : 439

3.3.22. Amphineurus (Rhamphoneurus) rutristylus Alexander, 1968

Amphineurus (Rhamphoneurus) rutristylus Alexander, 1968: 30 (description, fig. 18: male terminalia).

Material examined.

Holotype: ♂, Chile, Valdivia, Enco [39°53′S 72°8′W], 1400-1600 m, 6-III-1955, Peña, Holotype 12226 (USNM) [part of specimen pinned and part in slide prepared by C.P. Alexander]. - Additional material: CHILE. 1 ♂ and 1 [sex unknown], Arauco, Nahuelbuta [37°46′S 72°59′W], 13/ 20-II-1958, Peña (USNM); 1 [sex unknown], Caramavida [37°40′S 73°20′W], 1000-1300 m, 1/ 6-I-1954, Peña (USNM); 1 [sex unknown], Lonquimay West, Cordillera las Raices [38°31′S 71°28′W], 1500 m, 25-XII-1968, Peña (USNM) ; 1 ♂, Lonquimay West, Cordillera las Raices [38°31′S 71°28′W], 1500 m, 25-XII-1968, Peña (USNM) *.

Diagnosis.

This species is distinguished by a dark spot near R2 and m-cu inserted at fork of bM. Furthermore this species is distinguished by the male terminalia with the lobule with two rounded margins forming heart shape, sheath of aedeagus is straight but without spurs and the mesal lobes are symmetrical, with slender, bare and slightly curved tips.

Redescription.

Wing length 6.87 mm, width 2.00 mm. - Coloration: General coloration dark brown. Rostrum and palpus dark brown. First segment of antenna light yellow, remainding segments dark yellow. Head brown. Eyes black. Thorax yellowish-brown, pleura light brown. Scutum without stripes. Halter brownish-yellow. Coxae brownish yellow and legs dark brown. Abdomen dark brown. - Head (Fig. 27A ): Rostrum bifurcated with long appendices; first palpal segment slightly shorter than terminal segment; scape thicker than pedicel, terminal flagellomere as long as penultimate, antenna with numerous setae. - Thorax (lateral view Fig. 27D , dorsal view Fig. 27E ): Thorax with several long setae. Anatergite taller than katatergite. Halter with dilated knob. Wing (Fig. 27C ) almost clear of markings, except for marking covering R2; veins near bM (Fig. 27B ) faded; m-cu inserted at fork of bM; M1+2 shorter than basal deflection of M1; R2+3+4 longer than R2+3. - Male terminalia (Fig. 27F ): Male tergite IX faintly darkened at posterior margin, with wide V-shaped median notch; posterolateral lobes nearly triangular; ventral branch slender, with concentration of setae on distal tip. Dorsal branch of gonocoxite shorter than half length of ventral branch. Lobe of gonostylus with heart-shaped lobule, more than twice as wide as lobe of gonostylus. Clasper of gonostylus with differently shaped branches: lateral branch straight; medial branch curved, oblong-shaped. Mesal lobes of gonocoxite symmetrical, both with narrow, elongate, straight extremity. Sheath of aedeagus straight, slightly bent near tip, darkened at distal one-third.

Remarks.

Some specimens of this species were misidentified by C.P. Alexander as A. (R.) insanus Alexander. This species resembles A. (R.) glabristylatus Alexander but differs mainly in the attachment of m-cu, wing markings, shape of male tergite IX and mesal lobe.

Figures

Figure 27. Amphineurus (Rhamphoneurus) rutristylus Alexander. A head (dorsal view); B detail of wing; C wing; D thorax (lateral view); E thorax (dorsal view); F male tergite IX (dorsal view) and remainder of male terminalia (lateral view). - Abbreviations: aed sh, sheath of aedeagus; anatg, anatergite; anepm, anepimeron; anepst, anepisternum; aprn, anteropronotum; cgonst, clasper of gonostylus; cx, coxa; goncx, gonocoxite; hlt, halter; k, knob of halter; kepm, katepimeron; kepst, katepisternum; ktg, katatergite; l ms, left mesal lobe of gonocoxite; lgonst; lobe of gonostylus; mr, meron; mtanepst, metanepisternum; mtepm, metepimeron; mtg, mediotergite; mtkepst, metakatepisternum; mtn, metanotum; p, posterior basalare; patg, paratergite; pprn, postpronotum; presct, prescutum; r ms, right mesal lobe of gonocoxite; sct, scutum; sctl, scutellum; t 9, male tergite IX.