Two new Xestia Hübner, 1818 species from China (Lepidoptera, Noctuidae)
Author
Gyulai, P.
H- 3530 Miskolc, Mélyvölgy 13 / A, Hungary. E-mail: gyulainegarai. adrienne @ upcmail. hu
Author
Ronkay, L.
Department of Zoology, Hungarian Natural History Museum, H- 1088 Budapest, Baross u. 13, Hungary.
Author
Saldaitis, A.
Nature Research Centre, Akademijos str. 2, LT- 08412 Vilnius- 21, Lithuania. E-mail: saldrasa @ gmail. com
text
Zootaxa
2013
2013-11-04
3734
1
96
100
journal article
10.11646/zootaxa.3734.1.12
1175-5326
5268855
28CCA1C9-D85D-45F1-B9D5-14A8094F9236
Xestia rimas
Gyulai, Ronkay & Saldaitis
sp. n.
(
Figs. 4
,
12–15
)
Type material
.
Holotype
:
Male
,
China
, N-Sichuan, road
Songpan - Jiuzhaigou
,
3000 m
, 3308.770’N, 10343.624’E,
23.vii.2011
, leg.
A. Floriani
&
A. Saldaitis
, slide
No
PGY
3213m
(coll.
Peter Gyulai
, later in
Hungarian Natural History Museum
,
Budapest
,
Hungary
)
.
Paratypes
:
5 males
, with the same data as the holotype, colls
Peter Gyulai
,
Alessandro Floriani
(
Milan
,
Italy
) and
Gintaras Rimas
(
Bendoreliai
,
Lithuania
)
Slide No
PGY
2893m
.
FIGURES 12–15.
Xestia
ssp. males
genitalia. 12.
X. rimas
sp. n.
,
holotype, capsule, prep. PGy3213; 13.
X. rimas
sp. n.
, holotype, aedeagus, prep. PGy3213; 14.
X. rimas
sp. n.
, paratype, capsule, prep. PGy2893; 15.
X. rimas
sp. n.
, paratype, aedeagus, prep. PGy2893.
Diagnosis and Description.
Wingspan
36–38 mm
. The new species with its prominent morphological autapomorphies represents a unique lineage within the entire Holarctic genus
Xestia
s. l.
Externally it slightly resembles
Rhyacia mirabilis
Boursin, 1954
and
R. admiranda
Gyulai & Ronkay, 2001
, but has a less robust body and broader trigonical forewings with a short apex and straight outer margin. The dark bluish-ashy grey forewing ground colour distinguishes it from the two bright greenish
Rhyacia
species
; the orbicular and reniform stigmata are lighter than the ground colour, but not so dark as those of
R. mirabilis
and
R. admiranda
.
Xestia rimas
(
Fig. 3
) is also somewhat similar to certain other Holarctic larger, greyish coloured members of the subgenus
Pachnobia
Guenée, 1852
(formerly
Anomogyna
Staudinger, 1871
; was synonymised with
Pachnobia
,
Lafontaine, 1998
) but is easily separable by the almost unicolorous dark bluish ashy grey forewing ground colour, the unusual light ochreous suffusion of the basal field, the large, regular, light ochreous-grey filled orbicular stigma and the conspicuous small, dark ochreous spot in the indistinct, darkened reniform stigma. Antennae filiform; legs blackish; hindlegs with a single long and two shorter spines; head, thoracic pubescence and palpi light ashy grey; palpi with black underside; abdomen light brown; antemedial line double, wavy; postmedial line simple, arcuate and serrated; both crosslines diffuse, blackish-grey; subterminal line obsolescent, with blackish trigonical costal patch and black arrowheads at inner side; hindwing brownish-grey, with darker cellular discal spot and wavy medial line; cilia of both wings ashy grey. The male genitalia (
Figs. 12–15
) are typical of the subgenus
Pachnobia
but the distal part of the valva is more elongated, terminally bifurcate, and resembles those of some species of the subgenus
Raddea
Alpheraky, 1892
(formerly
Erebophasma
Boursin, 1963
; was synonymised with
Raddea,
Lafontaine 1998
and
Kononenko et al. 2012
), especially
Raddea hirsuta
(
Chen, 1985
)
. The specific features of the male genitalia of
X. rimas
are the large, broadly calyciform juxta, with deep, laterally sinuous V-shaped dorso-medial incision; particularly distally elongated, terminally asymmetrically bifurcate, pointed valva; medium-large, thick and basally strongly curved, apically acutely pointed harpe; large knot-shaped carinal plate, appearing rather like a basal cornutus; the dorsally recurved, ample vesica with sclerotised, slightly serrated subbasal plate. Female unknown.
Bionomics and Distribution.
The
six males
were collected at ultraviolet light on
23 July
2011
in
Sichuan Province
in a remote area located at the southern end of the Minshan mountain range (
Fig. 5
). The collecting area is near Jiuzhaigou National Park. The climate in the valley is cool, with a mean annual temperature of 7.2 degrees C and total annual rainfall of
661 mm
(80% of which occurs between May and October). Jiuzhaigou's ecosystem is classified as temperate broad-leaved forest and woodlands, with mixed mountain and highland systems. Among other summer noctuid species collected at the time were
Haderonia albirena
(Draudt, 1950)
,
Diphtherocome pallida
(Moore, 1867)
,
Xestia morandinii
Gyulai, Ronkay & Saldaitis, 2011
,
Papestra florianii
Gyulai, Ronkay & Saldaitis, 2011
.
Etymology.
Dedicated to Mr. Gintaras Rimas (Bendorėliai,
Lithuania
) for his special interest in
Xestia
.