A Revision of the New World Genera Brachylinga Irwin and Lyneborg and Lysilinga Irwin and Lyneborg (Diptera: Therevidae: Therevinae) with the Description of a New Genus, Elcaribe Webb
Author
Webb, Donald W.
Author
Metz, Mark A.
text
Zootaxa
2006
2006-08-14
1288
1288
1
241
journal article
11755334
FAA70D1F-49C8-40FC-9D96-CCF8C017E6BB
Brachylinga attenuata
Webb
spec. nov.
(
Figs. 4
,
27
,
50
,
73
,
96
,
119
,
142
,
165
)
Etymology
Attenuatus
(Latin) = drawn out, tapered. This name is used as an adjective and refers to the narrowed, extended gonocoxite, lateral view (
Fig. 73
).
Diagnosis
Brachylinga attenuata
is taxonomically associated with
B. clausa
in possessing setae on the katepisternum; in having the halter knob yellow; and in having the gonocoxite attenuate in ventral (
Fig. 27
) and lateral views (
Fig. 73
). It differs from
B. clausa
in having the posterior margin of the hypoproct rounded (
Fig. 4
); the apex of the distiphallus (
Fig. 119
) tapered to a point; the ventral apodeme (
Fig. 142
) of the male aedeagus extending to anterior margin of dorsal apodeme; and the distiphallus in lateral view (
Fig. 165
) recurved anteroventrally.
Description of
holotype
male (MEI 046047)
Body length
5.5 mm
.
Head.
Length
0.78 mm
. Ommatidia smaller ventrally and laterally. Frons pruinescence gray, brownish gray dorsally; setae dark brown on dorsal half. Antenna/head length 0.60; scape and pedicel dark reddish brown, pruinescence gray, first flagellomere dark yellow, second and third flagellomeres dark brown; scape length
0.12 mm
, width
0.10 mm
, length/width 1.2, scape/pedicel length 1.7, scape/flagellum width 0.77, setae yellow, short; pedicel length
0.07 mm
, length/width 0.7; flagellum length
0.28 mm
, width
0.13 mm
, length/width 2.2, flagellum/scape width 2.3. Parafacial pruinescence white. Maxillary palpus dark yellow; length
0.30 mm
, length/width 5.0; setae pale yellow, elongate. Genal setae white. Occipital setae white becoming lanceolate, appressed dorsally. Postocular macrosetae dark reddish brown.
Thorax.
Macrosetae dark reddish brown, 3 np, 2 sa, 1 pa, 2 dc, 2 sc. Mesonotum dark brown pruinescence brownish gray; setae dark brown, short intermixed with white, lanceolate, appressed setae. Pleuron and scutellum dark reddish brown, pruinescence white; setae white on propleuron, anepisternum, katepisternum, metanepisternum, laterotergite, and scutellum.
Wing.
Membrane pale gray, veins brown, pale yellow anteriorly; length
4.2 mm
, length/width 3.2; pterostigma dark yellow; cell m
3
closed, petiolate. Halter pale yellow.
Legs.
Coxa setae white, present on posterior surface of midcoxa; macrosetae dark reddish brown. Fore and midfemora reddish brown, midfemur dark yellow apically, hindfemur dark yellowish brown, apex brown; ventral setae white on fore and midfemora; av 0:0:4, pv 0:0:2. Tibiae dark yellow, apex dark reddish brown. Tarsomeres 1–2 dark yellow, apex dark reddish brown; 3–5 pale brown.
Abdomen.
Pale reddish brown, pruinescence white; dorsal setae white, appressed; lateral setae white.
Terminalia
. Reddish brown. Tergite 8 (
Fig. 4
), narrow medially (
0.02 mm
); setae dark yellow, absent medially on posterior margin. Sternite 8 (
Fig. 27
) quadrate, sides rounded, posterior margin emarginate. Epandrium (
Fig. 4
), sides rounded; setae dark yellow. Cercus (
Fig. 4
) ending basal to apex of hypoproct. Hypoproct (
Fig. 4
), posterior margin rounded, ending distal to apex of cercus. Gonocoxite ventral view (
Fig. 27
) broad anteriorly becoming attenuate apically; setae dark yellow, apical macrosetae black; dorsal view (
Fig. 50
), posteromedial lobe and gonocoxal bridge absent; lateral view (
Fig. 73
) attenuate, apex curved ventrally; ventral lobe (
Fig. 27
) with ventral spines. Gonostylus (
Fig. 96
), basodorsal lobe large, rounded; ventral margin curved ventrally, setae dark yellow, not directed apically in distinct tuft; fine, short spines absent laterally. Aedeagus with dorsal apodeme (
Fig. 119
) oval, posterolateral margin rounded; ventral apodeme (
Fig. 142
) tapered anteriorly, extending to anterior margin of dorsal apodeme; distiphallus (
Fig. 119
) tapered apically with narrow dorsal carina, lateral view (
Fig. 165
) recurved anteroventrally, lacking apicolateral spines; ejaculatory apodeme (
Fig. 119
), anterior margin slightly emarginate.
Female
Unknown.
Distribution
The
holotype
of
Brachylinga attenuata
was collected in
Ceara
Mirim,
Brazil
.
Habitats and phenology
Brachylinga attenuata
was handnetted in October.
Specimen examined
The
holotype
male of
Brachylinga attenuata
is labeled “
Ceara
Mirim, R.G. do Norte,
Brazil
, Outubro, 1940,
D. C. Alves
” and is deposited in the USNM
.