A taxonomic revision of the genus Scybalocanthon Martínez, 1948 (Coleoptera Scarabaeidae: Scarabaeinae: Deltochilini)
Author
Silva, Fernando A. B.
Universidade Federal do Pará, Instituto de Ciências Biológicas, setor de Zoologia, Campus Belém. Rua Augusto Corrêa, 01. Guamá. Belém PA 66075 - 110, Brazil. E-mail: fernandoabsilva @ yahoo. com. br
Author
Valois, Marcely
Programa de Pós-graduação em Zoologia, Universidade Federal do Pará / Museu Paraense Emílio Goeldi. Rua Augusto Corrêa, 01. Guamá. Belém PA 66075 - 110, Brazil.
text
Zootaxa
2019
2019-07-08
4629
3
301
341
journal article
21174
10.11646/zootaxa.4629.3.1
9419bc9b-dbe4-426c-a34e-f0034848ff99
1175-5326
3995508
1D47B452-0A40-4BC5-9BBA-C06DEB298C9A
Scybalocanthon federicoescobari
Silva & Valois
,
new species
(
Figs. 1I
,
4I
,
5H
,
6D
)
Etymology.
Named in honor of Federico Escobar, a scarab ecologist who was responsible for collecting the
type
specimens.
Diagnosis
. Specimens of
S. federicoescobari
are similar to those of
S. arnaudi
,
S. martinezi
,
S. papaxibe
,
S. pinopterus
, and
S. uniplagiatus
by having the pronotum uniformly colored, or with one elliptical spot on the central portion (
Figs. 1I
,
2A
,
1P
,
2K
,
1D, 1T
); femora almost completely yellow or brown, with black spots only on the tips (
Fig. 3G
); eighth elytral stria with thin carina on anterior portion (
Fig. 3D
); endophallus with bristles right beside the FLP sclerite (
Figs. 5H, R, N, W, D, Q
); and additional sclerite (
AS
) absent (
Figs. 5H, R, N, W, D, Q
). They can be distinguished from those of
S. pinopterus
and
S. arnaudi
by the strongly asymmetrical parameres; left paramere with acute projection on dorsal margin and bilobate excavation on ventral margin (
Fig. 4I
) (other species with slightly asymmetrical parameres, lacking acute projection and bilobate excavation on dorsal and ventral margins, respectively (
Figs. 4E, 4S
)); from those of
S. martinezi
,
S. papaxibe
, and
S. uniplagiatus
by the bilobate excavation of the ventral margin of the left paramere deeper than wide in lateral view, extending along one-fourth of the paramere margin (
Fig. 4I
) (in
S. martinezi
the bilobate excavation is wider and deeper, extending at least one-half of the paramere margin (
Fig. 4O
); in
S. uniplagiatus
its excavation extending along one-third of the paramere margin (
Fig. 4W
); in
S. papaxibe
its excavation is wider than deep in the lateral view (
Fig. 4R
)).
Description. Body.
Oval-elongate. Surface opaque, completely microgranulate.
Color
. Most of pronotum, hypomera, metaepisternae, metaventrite, abdominal ventrites, pygidium, and femora yellow or light brown. Head, elytra, prosternum, mesoventrite, mesoepisternae, trochanters, and tibiae dark brown.
Length.
7.8–9.5 mm
.
Thorax
. Pronotum with one brown rounded spot at the anterocentral portion. Spot elliptical in some specimens.Anterior angles of pronotum approximately 85°. Lateral margin regularly curved outward, not forming an angle at the middle portion.
Elytra
. Striae thin and shiny, punctures inconspicuous. Eighth stria with a thin carina at the anterior portion.
Aedeagus.
Parameres strongly asymmetrical (
Fig. 4I
). Dorsal margin of right paramere curved inward, apex obliquely truncate. Ventral margin of right paramere substraight, with a rounded excavation at the basal portion. Dorsal margin of left paramere curved inward from the basal to medial portions, apical portion with a short and pointed projection. Ventral margin of left paramere substraight, with a bilobate excavation at the basal portion, apical portion pointed. SRP circular, with rounded handle-shaped extension (
Fig. 5H
). FLP short, comma-shaped, with three sets of bristles right beside it (
Fig. 5H
). A+SA with two superposed and elongate sclerites (
Fig. 5H
).
Type material.
Holotype
.
COLOMBIA
:
GUAVIARE
,
Reserve Nukak
,
Cerro Moyano
(
71°10’58”W
,
02°10’35”N
),
II.1996
,
pitfall
human feces,
250 m
, F. Escobar—
1♂
(
CEMT
)
.
Paratype
.
COLOMBIA
:
GUAVI-
ARE
,
Reserve Nukak
,
Cerro Moyano
(
71°10’58”W
,
02°10’35”N
),
II.1996
,
pitfall
human feces,
250 m
, F. Esco-bar—
1♀
(
CEMT
)
.
Distribution.
Known from
Colombia
(
Fig. 6D
).
Endemism areas
:
Brazilian sub-region
: Boreal Brazilian dominion: Imeri province (see
Morrone 2014
; fig. 12).