Review of the Inca irroratus species group with description of two new species of Inca LePeletier & Serville, 1828 (Coleoptera, Scarabaeidae, Cetoniinae)
Author
Sousa, Rafael
3A67BC42-1B90-4D6C-A1EA-EB40FA131EA6
Museu de Zoologia da Universidade de São Paulo, Avenida Nazaré 481, Ipiranga, 04263 - 000 São Paulo, São Paulo, Brazil.
rafael.souza1988@gmail.com
Author
Seidel, Matthias
4DD9F954-99BB-49E9-AF45-D35E6D8903E3
Centrum für Naturkunde, University of Hamburg, Martin-Luther-King-Platz 3, 20146, Hamburg, Germany.
matthias.seidel@uni-hamburg.de
text
European Journal of Taxonomy
2021
2021-04-30
748
1
15
35
http://dx.doi.org/10.5852/ejt.2021.748.1335
journal article
7100
10.5852/ejt.2021.748.1335
04bf840b-8ba9-4059-8190-f2454630a714
2118-9773
4736129
AB54CD6A-B757-4E5A-8EB3-B9B466B74639
Inca irroratus
Chevrolat, 1833
Figs 1K–O, R
,
2I–L, O
,
3C, F
,
5
Ynca irrorata
Chevrolat, 1833
: unpaginated
.
Inca irroratus
Burmeister & Schaum, 1840: 380
.
Inca burmeisteri
Burmeister, 1847: 568
.
Syn. nov.
Differential diagnosis
Inca irroratus
can be distinguished from the other two species of the group by: females with clypeus bearing a medial rounded fovea (fovea absent in
I
.
axeli
sp. nov.
and
I
.
neglectus
sp. nov.
); medial tooth well developed (almost indistinct in
I
.
neglectus
sp. nov.
); clypeal horns in males with dorsolateral tooth short and rounded (long and acute in
I
.
axeli
sp. nov.
and
I
.
irroratus
); pronotum with posterior angles rounded (acute in
I. axeli
sp. nov.
and
I
.
neglectus
sp. nov.
) and lateral margin slightly sinuous and deeply crenulated (strongly sinuous and shallowly crenulated in
I
.
axeli
sp. nov.
and
I
.
neglectus
sp. nov.
); posterior tooth of protibia short and rounded (long and acute in
I
.
axeli
sp. nov.
and
I
.
neglectus
sp. nov.
); epipleuron with irregular and rounded marks on median area (indistinct marks in
I
.
axeli
sp. nov.
and
I
.
neglectus
sp. nov.
); outer distal process of parameres short and slightly rounded (long and acuminated in
I
.
axeli
sp. nov.
; long and rounded in
I
.
neglectus
sp. nov.
) (see
Table 2
).
Material examined
Neotype
of
Inca irroratus
(here designated)
BRAZIL
–
Rio de Janeiro
•
1 ♂
; “Rio. Jan. [Rio de Janeiro], Fry; 7517, Fry Coll. 1905-100.”;
BMNH
.
Lectotype
of
Inca burmeisteri
(here designated)
BRAZIL
–
Rio de Janeiro
•
1 ♂
; “Bras. [Brasil], Bske [Bescke] leg.,
Burmeisteri
*, Besck,
LECTOTYPE
,
Inca burmeisteri
,
Burmeister, 1847
, des. Sousa & Seidel 2020”;
MLUH
.
Paralectotypes
of
Inca burmeisteri
BRAZIL
–
Rio de Janeiro
•
1 ♂
,
2 ♀♀
; same collection data as for
I. burmeisteri
lectotype
;
MLUH
.
Additional material
BRAZIL
–
Rio de Janeiro
•
1 ♀
;
Nova Friburgo
,
Mury
;
1200 m
a.s.l.
;
Apr. 1999
;
R. Rajs
coll., “Coleção E & P. Grossi”;
UFRPE
•
1 ♂
; “Rio. Jan. [
Rio de Janeiro
], Fry,
Ynca burmeisteri
Burm
,
irroratus
(Oliv) Burm
; Brasilia, Fry Coll. 1905-100”;
BMNH
.
Type locality
Rio de Janeiro
,
Brazil
.
Redescription
Male
BODY (
Fig. 1K–M
). Total length including clypeal horns
43–47 mm
(
neotype
:
44 mm
); width across humeri
18–19 mm
(
neotype
:
18 mm
).
COLOUR. Reddish brown; dorsal surface with metallic reflections; legs and meso- and metathoraX with reddish brown bright colour (
Fig. 1K–M, R
).
HEAD. Surface of frons with reddish brown waxy secretion; clypeal horns with inner dorsal carina weak, anterior area gradually interrupted at apex; dorsolateral tooth short and rounded (
Fig. 1R
).
THORAX. Lateral margin of pronotum slightly sinuous and deeply crenulated; lateromedial area with grooved fovea; longitudinal groove shallow; posterior angles rounded (
Fig. 1K–M
); anterior prosternal process evenly rounded, projected and densely setose in median area. Scutellar shield punctate in anterolateral area. Elytra with light yellow waxy maculae covering all surface; epipleuron with irregular and rounded marks on median area (
Fig. 3F
).
LEGS. Posterior tooth of protibia short and rounded (
Fig. 3C
). Mesempodium with 2 setae.
ABDOMEN. Fovea of sternite VII slightly marked. Disc of pygidium densely punctate, lateral area with well-defined punctures.
TERMINALIA. Aedeagus: outer distal process of parameres short and slightly rounded (
Fig. 1N–O
).
Female
BODY (
Fig. 2I–K
). Length 44.0–
48.5 mm
; width across humeri 18.0–
19.5 mm
. Disc of clypeus with large and rounded fovea below process of posteromedian area (
Fig. 2O
).
Distribution
Brazil
:
Rio de Janeiro State
(Nova Friburgo) (
Fig. 5
).
Fig. 5.
Distribution map of species of the
Inca irroratus
group.
Remarks
The
holotype
of
I. irroratus
cannot be found in the Muséum national d’histoire naturelle (Paris,
France
) or in the Natural History Museum (BMNH, London,
United Kingdom
) and we therefore consider it lost. The description by Chevrolat is rather general and does not allow to precisely identify the species. According to Chevrolat, the species is “bearing a very short median horn preceded by the transverse carina”, a combination of characters none of the two species in question possess. Females exhibit an elevated carina on the head only in one species (
Fig. 2O
), whereas the other (
Fig. 2N
) only possesses a cone-shaped tubercle. None of the species have a horn. Additionally, based on the illustration of the type of
I. irroratus
by
Gory & Percheron (1833)
, which lacks carina and horn, the female has a strongly crenulated pronotal margin and a medial tooth in the clypeal margin. To fiX the identity of
I. irroratus
, we designate a male
neotype
(conspecific with females possessing the aforementioned characters) from BMNH (
Fig. 1K–O, R
) from the type locality (Rio de Janeiro).
Not knowing the exact number of
syntypes
and their depositories and to guarantee nomenclatural stability, we designate a male
lectotype
for
I. burmeisteri
from the
syntype
series deposited in MLUH. The
lectotype
of
I. burmeisteri
is conspecific with
I. irroratus
, and therefore
I. burmeisteri
becomes a junior synonym. For
I. irroratus
sensu
Burmeister (1847)
, see the description of
I. neglectus
sp. nov.