A new species of Polynoncus Burmeister, 1876 from Brazil (Coleoptera: Trogidae)
Author
Huchet, Jean-Bernard
Author
Costa-Silva, Vinicius Da
text
Zootaxa
2018
2018-11-26
4524
5
553
566
journal article
27910
10.11646/zootaxa.4524.5.3
875593a5-0add-4d4f-9317-b0e444c93deb
1175-5326
2610746
8B069290-C9B6-4289-AB91-DD11B9E3812C
Reinstatement of
Omorgus
(
Omorgus
)
triestinae
Pittino, 1987
(
Figs. 14–18
)
Type material examined.
HOLOTYPE
♂
and seven
paratypes
: “Muséum Paris,
Brésil
, Minas-Geraes, de Castelnau 1847 / 7/47” (
MNHN
).
Other specimens examined.
102
specimens
. “
BOLIVIA
:
Santa Cruz
,
Chiquitos
, 1,6 km ESSE
Santiago de Chiquitos
,
622m
,
18°12'04”S
,
59°21'00”W
,
XI.2008
, carcass,
W.D. Edmonds
leg.” (
5♂
,
5♀
CEMT).
“
BRAZIL
:
Distrito Federal
,
Planaltina
,
ESEC
Águas Emendadas
,
15°32'31”S
,
47°36'49”W
,
16-31.XI.2009
,
M.R. Frizzas
leg.” (
6♂
,
1♀
CEMT
)
;
“
Planaltina
,
ESEC
Águas Emendadas
,
15°32'31”S
,
47°36'49”W
,
1-15.XI.2009
,
M.R. Frizzas
leg.” (
8♂
,
4♀
CEMT
)
;
“
Planaltina
,
ESEC
Águas Emendadas
,
15°32'31”S
,
47°36'49”W
,
16-31.
XII
.2009
,
M.R. Frizzas
leg.” (
2♀
CEMT
)
;
“
Planaltina
,
ESEC
Águas Emendadas
,
15°32'31”S
,
47°36'49”W
,
16-31.X.2009
,
M.R. Frizzas
leg.” (
1♂
,
4♀
CEMT
)
;
“
Planaltina
,
ESEC
Águas Emendadas
,
15°32'31”S
,
47°36'49”W
,
1-15.I.2010
,
M.R. Frizzaz
leg.” (
1♂
CEMT
)
;
“
Planaltina
,
ESEC
Águas Emendadas
,
15°32'31”S
,
47°36'49”W
,
I.2011
,
M.R. Frizzas
leg.” (
5♂
,
4♀
CEMT
)
;
“
Brasília
,
Parque Nacional de Brasília
,
15°43'46”S
,
47°57'23”W
,
24.XI.2016
, Interceptação de voo,
M.V.C. Rocha
leg.” (
1♂
CEMT
)
;
“
Brasília
,
Parque Nacional de Brasilia
,
15°51'22”S
,
47°48'48”W
,
21.
XII
.2015
,
N.H.D. Silva
leg.” (
1♂
,
1♀
CEMT
)
;
“
Brasília
,
Parque Nacional de Brasilia
,
12.I.2016
,
N.H.D. Silva
leg.” (
1♂
CEMT
)
.
“
Goias
,
Parque Nacional
das
Emas
, [
18°7'20”S
,
52°54'30”W
], 1999,
G. Machado
leg.” (
2♂
,
1♀
CEMT
)
;
“
Jataí
,
Fazenda Nova Orlândia
,
I.1964
, Martins, Morgate &
Silva
leg.” (1
MZSP
)
.
“
São Paulo
,
Itirapina
,
Estação Ecológica de Itirapina
,
735m
,
22°13'56”S
,
47°52'58”W
,
30.I.2009
,
Fernando Silva
leg.” (
1♂
CEMT
)
;
“
Itirapina
,
Estação Ecológica de Itirapina
,
735m
,
22°13'56”S
,
47°52'58”W
,
2.
II.2000
,
G. Machado
leg.” (
1♂
CEMT
)
;
“
Itirapina
,
Estação Ecológica de Itirapina
,
22°15’S
,
47°49’W
,
14.V.2001
à
15.I.2002
,
Equipe Biota
leg.” (16
MZSP
)
;
“
Marília
,
I.1948
” (1
MZSP
)
;
“
Ribeirão Preto
,
Fac. Medicina
,
XI.1954
,
M.P. Barretto
leg.” (
4♀
MZSP
)
;
“
Ribeirão Preto
,
Fac. Medicina
,
I.1955
,
M.P. Barretto
leg.” (
1♂
,
1♀
, 4 unsexed
MZSP
)
;
“
Itu
,
Faz. Pau d’Alho
,
II. 1959
,
U. Martins
leg.” (
1♂
MZSP
)
;
“
Pirassununga
,
18.XI.1940
,
Schubart
leg.” (1
MZSP
)
;
“
Pirassununga
,
27.X.1945
,
Schubart
leg.” (1
MZSP
)
;
“
Pirassununga
,
6.I.1946
,
Schubart
leg.” (1
MZSP
)
;
“
Pirassununga
,
3.
III
.1945
,
Schubart
leg.” (1
MZSP
)
;
“
Anhembi
,
XI.1957
,
E. Dente
leg.” (1
MZSP
)
;
“
Botucatu
,
22.II.1955
,
Werner
leg.” (
1♀
, 1 unsexed
MZSP
)
.
“
Ibirá
,
X.1953
,
Dirings
leg.” (
1♀
MZSP
)
.
“
Mato Grosso do Sul
,
Porto Murtinho
,
I.1930
,
R. Spitz
leg.” (1
MZSP
)
;
“
Porto Murtinho
,
XI.1929
,
R. Spitz
leg.” (1
MZSP
)
.
“
Minas Gerais
,
Uberlândia
,
Campus
UFU [=
Universidade Federal de Uberlândia
], [
18°55'06”S
,
48°15'28”W
],
11.II.2006
,
J. Mendes
leg.” (
1♀
CEMT
)
.
“
PARAGUAY
:
Concepcíon
,
Zanja Moroti
,
30.I.2005
,
P. Gandini
leg." (
3♂
,
CJBH
)
.
Species validation.
Omorgus
(
Omorgus
)
triestinae
was described by
Pittino (1987)
based upon a series of
12 specimens
from Minas-Geraes (
Brazil
) curated at the MNHN, Paris (
France
). In all likelihood, all the specimens from the
type
series were collected by F. Laporte de Castelnau himself during his expedition in South America (
1843–1847
), the results of which were subsequently published in several volumes (
Laporte
1850
–1861).
According to
Pittino (1987)
, this new species is closely allied to
O.
(
Omorgus
)
suberosus
(
Fabricius, 1775
)
and
O.
(
Omorgus
)
howelli
(Howden & Vaurie, 1957)
, but can be distinguished from both species by the presence of well-developed elytral tubercles (barely raised or obsolete in
O. suberosus
and
O. howelli
) as well as the characteristic and very distinctive shape of the aedeagus with parameres spaced basally, widely exposing median lobe (
Figs. 15–16
), and finally by the presence of a sclerotized piece within the endophallus (
Fig. 18
).
In his revision of the
Trogidae
of South America,
Scholtz (1990
: 1407), after having examined the
holotype
and three
paratypes
of Pittino's species, considered that this species corresponds, “
without doubt”
, to
O. suberosus
and placed consequently
O. triestinae
in synonymy with
O. suberosus
.
In this regard, Scholtz mentioned: “
The
holotype
is a somewhat unusual form with tomentose elytral costae (…). The male genitalia, claimed by the author to be quite different from those of
suberosus
, merely have the paramere apices far apart (probably an artefact of the dissection to remove them), and the internal sac armature, which was also claimed to be unique, varies greatly within the species.
FIGURES 14–18
.
Omorgus triestinae
Pittino, 1987
, male. 14, habitus, dorsal view (red arrows indicate discontinuous yellow tomentosity and white arrows indicate median-basal and lateral-basal tubercles of pronotum); 15, aedeagus, dorsal view; 16, aedeagus, with parameres intentionally spread out to show the shape of the median lobe; 17, aedeagus, lateral view; 18, sclerotized piece of the endophallus (Drawings courtesy (figs. 15 and 18): R. Pittino).
The recent study of more than five hundred South American trogid specimens related to “
O. suberosus
” from different institutions (CEMT, CJBH, MNHN, MZSP, and ZUEC), complemented by the examination of the
type
series of
O. triestinae
provides clear evidence that the morphological characteristics mentioned by
Pittino (1987)
in his diagnosis are perfectly applicable and constant within many specimens of the studied material. Moreover, as clearly illustrated here (
Figs. 15-18
), the male genitalia are specific and distinct from those of
O. suberosus
(
Figs. 20–22
), indicating that we are not observing the expression of a clinal morphological variation of a polymorphous species within its geographical area.
Omorgus triestinae
is restricted to central South America, to the Cerrado and Pantanal biomes, as well as an area of transition between the Cerrado and Atlantic Forest. Both biomes present little anthropic disturbance when compared to other biomes of South America. Thus, it appears that
Omorgus triestinae
is sensitive to anthropic actions, also differing from the widespread
Omorgus suberosus
. These morphologic features lead us to propose herein the restoration of
O. triestinae
as valid species. The main diagnostic morphological differences between both species are summarized in
Table 1
.
Remark
.
Vaurie (1962: 145)
suspected that some “unusual” specimens of
O. suberosus
from
Bolivia
,
Brazil
, and
Paraguay
could belong to a different species based on the shape of the tubercles and distinctly elevated costae. She stated: “
Three or four specimens from Santa Cruz,
Bolivia
, some from
Paraguay
, and one from Batataes,
Brazil
, have the tubercles of at least the two inner principal rows of each elytron much more elevated than usual
and with a heavier tomentosity; the males have slightly different genitalia. Possibly these represent another species, but I believe that they are variants of
suberosus
.“
Distribution
(
Fig. 23
). Central part of South America.