A new species of the genus Euxaldar Fennah, 1978 from China (Hemiptera, Fulgoroidea, Issidae)
A new species of the genus Euxaldar Fennah, 1978 from China (Hemiptera, Fulgoroidea, Issidae)
Zheng-Guang Zhang 0
Corresponding author: Xiang-Sheng Chen (chenxs
0 School of Life Sciences, Jinggangshan University , Ji'an, Jiangxi, 343009 , PR China 2 Institute of Entomology, Guizhou University , Guiyang, Guizhou Province 550025 , PR China
A new species Euxaldar guangxiensis sp. n. is described and illustrated from southeastern China. The generic characteristics are redefined. A checklist and key to the species of the genus Euxaldar are provided. The genus Euxaldar was erected by Fennah (1978) for a single species E. jehucal Fennah, 1978, described from Ninh Binh Province in Northern Vietnam (Fennah 1978). Recently this species was also recorded from Ha Noi, Vinh Phuc, Hoa Binh, and Haiphong Provinces; photos of the holotype of E. jehucal were provided (Gnezdilov and Constant 2012). The genus Euxaldar was previously placed in the tribe Issini Spinola, 1839 of the subfamily Issinae (Gnezdilov 2013). Recently, Wang et al. (2016) moved it to the tribe Hemisphaeriini Melichar, 1906 according to
eol>Fulgoromorpha; Guangxi Province; Hemisphaeriini; new species
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molecular phylogeny of Issidae.
Gnezdilov et al. (2017)
redescribed the type species
of the genus, E. jehucal, and described one more species, E. lenis Gnezdilov,
Bourgoin & Wang, 2017, from southern Vietnam. In this paper, one new species of the
genus Euxaldar is described and illustrated from southeastern China, the generic
characteristics are redefined and a checklist and key to the known species of the
genus are provided.
Materials and methods
The morphological terminology of the head and body follows Gnezdilov, Bourgoin
and Wang (2017), and the terminology of male genitalia follows
The genital segments of the examined specimens were macerated in 10% KOH and
drawn from preparations in glycerin jelly using a light microscope. Photographs of the
specimens were made using Zeiss stereo Discovery V8. Microscope with Zeiss Axio
Cam HRc camera, images were produced using the software Helicon Focus ver.6.7
and Photoshop CS4.0. The holotype of the new species is deposited in School of Life
Sciences, Jinggangshan University, China.
Type species. Euxaldar jehucal
, by monotypy.
Diagnosis. Body hemispherical, head including eyes wider than pronotum.
Metope flat and elongate. Coryphe transverse, 2-3 times as wide as long. Fore
wings elongate and wide, without hypocostal plate; venation poorly recognizable.
Hind wings one-lobed, rudimentary, much shorter than fore wings. Hind tibia
with two lateral spines. First metatarsomere with two latero-apical spines and 6-7
intermediate spines. Gonoplacs rounded. Phallobase asymmetrical, narrow, with
basal or subapical processes; ventral phalobase lobe shorter than the dorsal lobe.
Aedeagus without ventral hooks. Male anal tube enlarged apically or elongate (in
Distribution. China (Guangxi); Vietnam (Ninh Binh, Ha Noi, Vinh Phuc, Hoa
Binh, Haiphong and Lam Dong Provinces) (Figure 21).
List of Euxaldar species
(Vietnam: Ninh Binh, Ha Noi, Vinh Phuc, Hoa Binh and
E. lenis Gnezdilov, Bourgoin & Wang, 2017 (Vietnam: Lam Dong Provinces)
E. guangxiensis sp. n. (China: Guangxi Province)
Key to species of the genus Euxaldar modified from Gnezdilov et al. 2017
Metope smooth, without any pustules
(Gnezdilov et al. 2017: fig. 23)
........................................................E. lenis Gnezdilov, Bourgoin & Wang
Metope with row of distinct pustules along its lateral margins
Gnezdilov et al. 2017: fig. 20)
Metopoclypeal suture complete. Male anal tube deeply concave
posteromedially (in dorsal view)
(Gnezdilov et al. 2017: fig. 6)
...........E. jehucal Fennah
Metopoclypeal suture incomplete medially (Fig. 5). Male anal tube elongate,
wide at base, narrow at apical part, laterally with two triangular processes near
middle part (Figs 10, 12-13) ...................................... E. guangxiensis sp. n.
Euxaldar guangxiensis sp. n.
Type material. Holotype: 1 ♂, China: Guangxi, Nonggang National Nature Reserve
(E106°58'3", N22°28'37"), 163 m, 29 Oct. 2017, K.K. Liu
Description. Body length (from apex of vertex to tip of forewing): male 3.8mm;
Forewing: male 3.3mm
Coloration. Male: Coryphe (Figure 4) dark brown. Metope light brown
yellowish, with pale pustules along its lateral margins. Clypeus (Figure 5) pale brown with
dark brown band at base, rostrum and antenna dark brown (Figure 5). Pronotum and
mesonotum brown (Figure 4). Forewings (Figure 7) dark brown, each with wide black
band at midlength from costal margin to almost apex of clavus and with several light
yellow patches including large one in basal part of the wing. Hind wing (Figure 8) dark
brown. Legs (Figs 2–3) brown with dark brown markings. Abdomen (Figure 2) dark
brown, with margins rufous.
Head and thorax. Coryphe (Figure 4) transverse, approximately 3.0 times wider
than long, without carinae, anterior margin nearly straight, posterior margin slightly
angularly concave. Metope (Figure 5) flat, 1.1 times longer than widest, without a
median carina, with a row of distinct pustules along its lateral margins and rather weak
pustules inside. Metopoclypeal suture (Figure 5) incomplete medially. Postclypeus
with wide median carina. Pronotum (Figure 4) short, with keel-shaped margins.
Paradiscal fields very narrow behind the eyes. Mesonotum (Figure 4) 3.3 times longer than
pronotum in midline, with lateral carinae. Fore wings (Figure 7) oval, with smoothed,
poorly recognizable reticulate venation; CuP distinct. Hind wings (Figure 8)
rudimentary, 0.3 times as long as fore wings, veins obscure. Hind tibiae with 2 lateral teeth near
apex. Spinal formula of the hind leg 7-7-2.
Male genitalia. Anal tube (Figs 10, 12, 13) elongate, wide at base part and
narrow at apical part, slightly enlarged near apex, apical margin concave medially, laterally
with two triangular processes near its middle. Anal column (Figure 12) located near
base, 0.3 times as long as the anal tube in dorsal view. Pygofer (Figs 9, 14) in lateral
view, with posterior margin distinctly convex. Phallobase asymmetrical, dorsally with
three processes at base (Figure 18a, b), middle process of phallobase (Figs 15–16a, 18a)
wide, with two teeth apically, lateral processes of phallobase (Figs 15, 16b, 18b)
adjacent to middle process hook-shaped. Phallobase laterally with two processes near base,
one of them is long and directed caudally (Figure 15c), the other short and directed
cephalad (Figure 16d). Lateral phallobase lobes asymmetrical, narrowing apically, one
is short directed caudally (Figure 15e), the other is long and curved cephalically (Figs
15f, 16f ). Ventral phallobase lobe (Figure 17) not reaching the aedeagal apex,
apical margin nearly straight. Connective (Figure 19) in shape of long and narrow cup.
Gonostylus (Figure 20) triangular, with moderately convex hind margin, caudo-dorsal
angle widely rounded.
Etymology. The specific name refers to the locality, Guangxi province, China.
Host plant. Unknown.
Distribution. China (Guangxi province)
Remarks. This species resembles E. jehucal and E. lenis, but can be distinguished
from the latter in the following characteristics: Anal tube (Figs 10, 12–13) longer
than broad, narrowing from half to apex, slightly expanded near apex, apical margin
concave medially, laterally with triangular processes; phallobase (Figure 18) with
three processes at base in dorsal view, middle process wide (Figs. 15, 16a, 18a), with
two teeth apically, lateral processes (Figs 15, 16b, 18b) hook-shaped; phallobase
laterally with two processes (Figs 15c, 16d); lateral phallobase lobes asymmetrical,
narrowing apically, one is short (Figure 15e), the other is long and curved cephalad
(Figs 15f, 16f ).
The genus Euxaldar is similar to Neohemisphaerius Chen, Zhang & Chang, 2014, but
differs as follows: Posterior margin of coryphe slightly angularly concave (Figure 4);
Metope slightly longer in midline than widest, median carinae absent (Figure 5);
Metope and clypeus joint at nearly right angle (Figure 6); Clypeus without hump-like
processes (Figure 5); Aedeagus without ventral hooks (Figs 15, 16); Neohemisphaerius:
Posterior margin of coryphe obviously angularly concave
(see Chen et al. 2014: figs
2–35C, 2–36C; Zhang et al. 2016: fig. 1)
; Metope elongate, distinctly longer in
midline than widest, median carinae obviously present
(see Chen et al. 2014: figs 2–35E,
2–36E; Zhang et al. 2016: figs 3, 6)
; Metope and clypeus joint at nearly obtuse angle
(see Chen et al. 2014: figs 2–35D, 2–36D; Zhang et al. 2016: figs 2, 5)
; Clypeus with
a hump-like process medially
(see Chen et al. 2014: figs 2–35E, 2–36E; Zhang et al.
2016: figs 3, 6)
; Aedeagus with pair of ventral hooks
(see Chen et al. 2014: figs 2–35M,
2–36L; Zhang et al. 2016: fig. 9)
We are grateful to Mr. KeKe Liu (School of Life Sciences, Jinggangshan University) for
collecting valuable specimens. We thank Dr. Wilson and Dr. Gnezdilov for
proofreading. This work was supported by the Natural Science Foundation of China (31460157),
the Natural Science Foundation of Jiangxi Province, China (20171BAB204010),
Science Research Fund of Jiangxi Provincial Education Department (GJJ170639), the
Scientific Research Foundation for Doctors of Jinggangshan University (JZ10039) and
High Level Discipline of Biology, Jiangxi Province.
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