A review of the Neotropical microcaddisfly genus Acostatrichia Mosely, 1939 with description of a new species from Brazil (Trichoptera: Hydroptilidae: Leucotrichiinae)
Author
Santos, Allan Paulo Moreira
text
Zootaxa
2020
2020-03-24
4755
2
201
230
journal article
10.11646/zootaxa.4755.2.1
dc3a4f00-2ae5-4844-a803-7d8dabd65435
1175-5334
3731414
urn:lsid:zoobank.org:pub:CAD4295B-2456-48EE-98F6-723FDEF5C0EB
Acostatrichia tuskera
Oláh & Flint 2012
Figs. 10
,
16
Acostatrichia tuskera
Oláh & Flint 2012: 157
, figs. 38–40, male;
type
locality:
Brazil
:
São Paulo State
, Piracicaba;
type
depository: NMNH (not found).
Redescription.
Length from front of head to tips of folded forewings
3 mm
(n = 3). General color, in alcohol, dark brown. Head unmodified. Ocelli 3. Antennae each 20-articulated; scape cylindrical, as long as wide, inner margin not produced; pedicel cylindrical; flagellomeres cylindrical, unmodified. Forewings each with costal vein bearing short basal bulla. Abdominal segment VII bearing very long ventromesal process, with capitate apex (
Figs. 10A, 10C
). Segment VIII shorter dorsally than ventrally (
Fig. 10C
); in ventral view, posterior margin of sternum truncate (
Fig. 10A
); with pair of ventrolateral processes with acute apices (
Figs. 10A, 10C
); tergum with transverse row of long setae (
Fig. 10B
). Segment IX mostly within segment VIII, ventrally open; without dorsolateral processes (
Figs. 10B, 10C
). Preanal processes globose and bearing very long setae (
Figs. 10B, 10C
). Inferior appendages fused with each other as plate with shallow U-shaped incision on posterior margin in ventral view (
Fig. 10A
); each with very long digitate lateral process rising from apex and bearing 3–4 subapical spine-like projections at midlength (
Fig. 10A
); in lateral view, upturned (
Fig. 10C
). Subgenital plate, in ventral view, broad, rounded and with small median triangular projection at apex (
Fig. 10A
); in lateral view, slightly downturned (
Fig. 10C
). Tergum X membranous, bilobed, both lobes rounded in dorsal view (
Fig. 10B
). Phallus tubular basally, bearing midlength complex, with dorsal window and basal loop shorter than basal portion of phallus (
Fig. 10D
); apical portion without conspicuous sclerites and with several internal spines (
Figs. 10D, 10E
).
FIGURE 10.
Acostatrichia tuskera
Oláh & Flint 2012
, paratype male, genitalia.
10A
, ventral;
10B
, dorsal;
10C
, left lateral;
10D
, phallus, dorsal;
10E
, phallus, left lateral. Scale bar = 0.1 mm.
Material examined.
PARATYPES
:
Brazil
,
Sao Paulo
,
Piracicaba
,
12.III.1965
,
C.A. Triplehorn
leg.,
3 males
(
NMNH
).
Remarks.
As mentioned before, within the
A
.
brevipenis
Group,
Acostatrichia brevipenis
and
A
.
tuskera
appear to be closely related to each other, sharing similarities in the general aspect of male genitalia. Both species have the ventrolateral processes of segment VIII short and acute (
Figs. 7C
,
10C
), whereas for the other species in the group those processes are much longer and not acute.
Acostatrichia tuskera
can be distinguished from
A
.
brevipenis
and other
Acostatrichia
species by the long apicolateral processes of the inferior appendages, which are curved inwards, in ventral view (
Fig. 10A
), and have 3 or 4 spines at midlength (
Figs. 10A, 10C
).
Distribution.
Brazil
(
Fig. 16
).