Myiomystax trilineata Curler 2020, n. gen., n. sp.
Creators: name: Curler, Gregory
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Psychodidae
Myiomystax
Myiomystax trilineata

description: Myiomystax trilineata n. gen., n. sp.
(Figs 3; 4; 5B)
urn:lsid:zoobank.org:act: 4BF6B1A7-8DED-4AFA-9184-A51145B25143
TYPE LOCALITY. — Guyane, Mitaraka.
TYPE MATERIAL. — Holotype. French Guiana • ♂; Mitaraka, site MIT-C-RBF2; 02°14’03.4”N, 54°26’53.0”W; 29 m a.s.l.; lowland rainforest; 27.II-6.III.2015; YPT; Marc Pollet leg. (sample code: MITARAKA/125); specimen dissected, mounted on slide; MNHN. Paratypes. French Guiana • 1 ♀; site MIT-C-RBF2; 02°14’03.4”N, 54°26’53.0”W; 29 m a.s.l.; lowland rainforest; 27.II.2015; Marc Pollet leg. (sample code: MITARAKA/018); SW; LACM 340595 • 4 ♂, 2 ♀; same data as holotype; YPT; MNHN (2 ♂, 1 ♀), LACM (2 ♂ LACM 340603-340604, 1 ♀ LACM 340605) • 1 ♂, 2 ♀; site MIT-C-RBF1; 02°14’10.8”N, 54°26’49.5”W; 25 m a.s.l.; lowland rainforest; 27.II-8.III.2015; Marc Pollet leg. (sample code: MITARAKA/133); YPT; MNHN (♂, 1 ♀), LACM (1 ♀ LACM 340606) • 9 ♂, 5 ♀; site MIT-C-RBF2; 02°14’03.4”N, 54°26’53.0”W; 29 m a.s.l.; lowland rainforest; 6-10. III.2015; Marc Pollet leg. (sample code: MITARAKA/136); YPT; MNHN (4 ♂, 3 ♀), LACM (5 ♂ LACM 340607-340611, 2 ♀ LACM 340612-340613) • 1 ♀; site MIT-C-RBF2; 02°14’03.4”N, 54°26’53.0”W; 29 m a.s.l.; tropical wet forest (bas fond); 27.II-2. III.2015; Marc Pollet leg. (sample code: MITARAKA/184); SLAM; MNHN • 1 ♀; site different sites near base camp and along trails; 14.III.2015; Julien Touroult & Eddy Poirier leg. (sample code: MITARAKA/191); SLAM; MNHN.
ETYMOLOGY. — The specific epithet is derived form the Latin word “linea”, meaning line, in reference to the three darkly pigmented wing veins present in this species.
DIAGNOSIS. — See above, Myiomystax n. gen.
DISTRIBUTION. — Currently known from multiple localities in the Mitaraka range of French Guiana.
HABITAT. — Little information regarding specific habitat is available; however, all specimens were collected in lowland rainforest.
DESCRIPTION
Male
Measurements, (N = 4) head width 0.41 mm (0.38-0.44), head height 0.47 mm (0.44-0.48), wing length 2.17 mm (2.08- 2.24), wing width 0.54 mm (0.52-0.56). Head with vertex extended slightly posteriorly, eyebridge comprised of 3 facet rows, contiguous but strongly constricted at median. Frons and clypeus distinctly divided; frontal scar patch bilobed posteriorly, contiguous medially; clypeus elongated laterally, with lateral margins overlapping medial margins of eyes. Antennae: scape cylindrical, about 2.5 times longer than wide; pedicel globular; flagellomeres 1-5 elongate, cylindrical; flagellomeres 6-11 fusiform; flagellomeres 12-14 reduced, bead-like; flagellomere 14 with apical process digitiform, setose, approximately as long as node; all flagellomeres lacking ascoids. Mouthparts extending slightly beyond base of palp segment 1; labellum about as wide as anterior margin of clypeus; palpi conspicuously elongate, with segment 1 hook-like; segment 2 clavate, inflating from base to apex; segment 3 elongate, inflated at midlength; segment 4 inflated apically, capitate; palp segments with clusters of spatulate setae inserted dorsally and ventrally; palps folded behind head at rest. Wing: strongly lanceolate; radial fork positioned slightly distal to apex of CuA; medial fork positioned at the level of apex of CuA; R 5 terminating in C posterior to wing apex; wing veins R 1, R 5 and M 4 pigmented brown, appearing more heavily sclerotized than other wing veins (Fig. 5B); costal vein with light pigment between apices of R 1 and R 3, M 1 and M 4; pigmented veins contrasting against other lightly colored wing veins. Male terminalia: bilaterally symmetrical; hypandrium flat, band-like, arched posteriorly, fused with gonocoxites laterally; intersegmental membrane connecting between anterior margin of hypandrium and posterior margin of abdominal segment 8, covering base of ejaculatory apodeme; ejaculatory apodeme dorsoventrally compressed anterolaterally, dome-like at center, articulating ventrally with gonocoxal apodemes, posteriorly with aedeagal sclerites; aedeagus comprised of paired, laterally compressed sclerites, spatulate in lateral view; spatulate sclerites enveloped by tubular membrane; parameres not differentiated from aedeagus; gonostyli tapered, sinuous from base to apex (Fig. 3D), digitiform apically, setose, with paired, elongate setae inserted medially near apex (Figs 3D; 4A); gonocoxites glabrous, without setae alveoli (Figs 3D; 4A), cylindrical, about two times as long as wide; gonocoxal apodemes inflated, rounded in dorsoventral view, bulbous in lateral view, linked to subepandrial sclerite anteromedially; subepandrial sclerite narrow, divided medially, with puckered seam at median, with posterolateral arms ribbon-like, linked to base of epandrial claspers; epandrium rectangular along posterior half in dorsoventral view, anterior half narrowing abruptly; epandrial claspers elongate, tapered, curved dorsally from base to apex, with single, spatulate tenaculum inserted dorsoapically.
Female
Measurements, (N = 4) head width 0.44 mm (0.42-0.46), head height 0.41 mm (0.40-0.42), wing length 2.16 mm (2.04-2.36), wing width 0.53 mm (0.52-0.56). Head mostly as in male. Antennae with flagellomeres 1 and 2 elongate, cylindrical, shorter than in male; apical flagellomeres missing in specimens observed. Mouthparts as in male; maxillary palpi more typical of Psychodinae, segments not elongated; palp segment proportions: 1, 1.30, 1, 2.30. Wing venation as in male. Terminalia: cerci conical in ventral view, with ventral surface covered by setulae, numerous setae inserted laterally and ventrally; posterior margin of sternum 8 trilobed, with median lobe wider than flanking lobes; oviduct with microtrichia internally on membrane.
description: Published as part of Curler, Gregory, 2020, Descriptions of two new genera of Maruinini (Diptera, Psychodidae, Psychodinae) from the Mitaraka range of French Guiana, pp. 139-149 in Zoosystema 42 (10) on pages 147-148, DOI: 10.5252/zoosystema2020v42a10, http://zenodo.org/record/3743146