Research Article |
Corresponding author: Qiaoqiao Ji ( cannalove@163.com ) Academic editor: Warren Steiner
© 2019 Qiaoqiao Ji, Guodong Ren.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Ji Q, Ren G (2019) Two new species of the genus Cyanopenthe Nikitsky, 1998 (Coleoptera, Tetratomidae) from southwest China. ZooKeys 874: 19-30. https://doi.org/10.3897/zookeys.874.34724
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The genus Cyanopenthe Nikitsky, 1998 is first recorded from mainland China. Two new species, C. granulata sp. nov. and C. hirtiscutellara sp. nov., are described and illustrated. This genus is redefined, and an updated key to the known species is presented.
polypore fungus beetles, taxonomy, Xizang, Yunnan
The family Tetratomidae Billberg, 1820 within the superfamily Tenebrionoidea Latreille, 1802 consists of approximately 150 extant species belonging to 13 genera of five subfamilies (
The genus Cyanopenthe Nikitsky, 1998 belongs to the subfamily Penthinae Lacordaire, 1859 and contains only four described species in the world (
The specimens were examined and dissected under a Nikon SMZ800 microscope. Photographs of adult habitus were taken with a Canon EOS 5D Mark III connected to a Canon MP-E 65 mm macro lens. Photographs of other morphological details were taken using a Leica M205A stereomicroscope. Adobe Photoshop 7.0 software was used in image processing. The aedeagus and ovipositor were detached from the body with insect needles, then glued to separate cards and pinned under the specimens. Specimens examined in this study are deposited in MHBU (Museum of Hebei University, Baoding, China) and IZCAS (Institute of Zoology, Chinese Academy of Sciences, Beijing, China). A double slash (//) separates data of different labels.
Body length was measured from the anterior margin of the clypeus to elytral apex; the terminology of the ovipositor follows
1 | Pronotum sparsely and finely punctured; scutellum black, transverse, apex rounded, with distinct, dark rounded impression in middle | 2 |
– | Pronotum densely and coarsely punctured or densely granulate; scutellum yellow, bronzed or reddish bronzed triangular, without impression | 4 |
2 | Antennomeres III–V somewhat slender, projections of antennomeres VIII–IX longer than that of antennomere X; paraproct of ovipositor shorter, 1.2 times as long as wide | C. thailandica Nikitsky, 1998 |
– | Antennomeres III–V slightly thicker, projections of antennomeres VIII–IX as long as or shorter than that of antennomere X; paraproct of ovipositor longer, 1.4–1.6 times as long as wide | 3 |
3 | Elytra and abdomen more rounded; anterolateral margin of pronotum more rounded; lateral margins of parameres of tegmen slightly convergent distally; proctiger of ovipositor slightly wider in ventral view | C. taiwana Hsiao et al., 2015 |
– | Elytra and abdomen more elongate; anterolateral margin of pronotum less rounded; lateral margins of parameres of tegmen subparallel to slightly divergent distally; proctiger of ovipositor slightly slender in ventral view | C. leei Hsiao et al., 2015 |
4 | Pronotum either densely and coarsely punctured throughout or granulate posteriorly with coarse punctures on anterior half of pronotal disc; antennomere V evidently longer than VI in female (Fig. |
5 |
– | Pronotum densely granulate throughout; antennomere V nearly as long as VI in female (Fig. |
C. granulata sp. nov. |
5 | Dorsal side of body blue-violet; pronotum densely granulate, except coarsely punctured in anterior half of disc; scutellum yellow; lateral margins of paraproct of ovipositor somewhat straighter, proctiger almost as long as gonocoxites, gonostylus with long setae (Figs |
C. hirtiscutellara sp. nov. |
– | Dorsal side of body blue; pronotum densely and coarsely punctured; scutellum bronzed or reddish bronzed; lateral margins of paraproct of ovipositor more sinuate, proctiger longer than gonocoxites, gonostylus without setae ( |
C. metallica (Champion, 1916) |
Cyanopenthe
Nikitsky, 1998: 29; 2005: 20; 2008: 63;
Penthe metallica Champion, 1916 (by original designation).
Body black, shining, with dark metallic blue or green-blue, covered with dense and black erect pubescence. Head small, dorsal surface with narrow, longitudinal median depression. Eyes lateral, large and protruding. Antennae long, antennomeres VIII–XI (♂) or VII–XI (♀) strongly broadened into a pectinate club. Pronotum transverse, disc weakly convex, flattened laterally with pair of large impressions near base. Prosternal process strongly broadened posteriorly and somewhat roundly truncate apically, slightly exceeding the posterior margin of prothoracic coxae. Scutellum large, triangular or transverse, covered with dense and decumbent yellow to reddish, bronzed pubescence, with or without dark rounded impression at middle. Elytra broadly oval, much wider than pronotum, disc convex, depressed from middle to humeri along lateral margins. Legs slender and long, underside of metafemora with [or maybe without (not mentioned in the previously described species)] dense yellow hairbrush from base to middle in male, metatarsomere I shorter than the remaining tarsomeres combined.
Aedeagus ensiform, parameres slightly shorter than or as long as phallobase. Distal part of parameres divergent in dorsal and ventral view, curved to ventral side in lateral view.
Ovipositor flattened, paraproct elongated, lateral margins subparallel, straight or weakly curved; proctiger semicircular in dorsal view, tapered posteriorly and more or less curved in ventral view.
Bhutan, China (Taiwan, Xizang, Yunnan), India, and Thailand.
Holotype: ♂ (MHBU) (Fig.
This species is similar to C. metallica (Champion, 1916), but can be distinguished by the following characters (based on females): dorsal side of body green-blue; antennomere V nearly as long as VI; densely granulate on pronotum; scutellum bronzed; elytral surface with large punctures nearly in rows; posterior margin of abdominal ventrite V more broadened; paraproct of ovipositor more elongate (1.7 times as long as wide), lateral margins weakly curved.
Dorsal side of body royal blue, antennae, femora, tibiae and ventral side of body dark blue, some of sternum and abdomen blue-green. Scutellum bronzed, bordered with distinct blue-violet metallic sheen on elytra. Body with dense and black erect pubescence dorsally as well as ventrally. Scutellum with dense and decumbent orange pubescence. Underside of metafemora densely with yellow hairbrush from base to middle in male.
Male (Figs
Pronotum (Fig.
Elytra broadly oval, length 6.4 mm, width 4.0 mm, much wider than pronotum. Disc convex, depressed from middle to humeri along lateral margins. Surface with tiny punctures, and large punctures nearly in rows medially on each elytron. Diameter of punctures in spaces between striae 1.7 times smaller than that of punctures in rows.
Abdomen (Figs
Legs slender and long. Length of metafemora 2.5 mm, metatibiae 2.1 mm and metatarsi 2.0 mm. Metatarsomere I shorter than II–IV combined. Length ratio of metatarsomeres (Fig.
Aedeagus (Figs
Female (Figs
Ovipositor (Figs
China: Xizang.
This species is named from the Latin granulus, referring to the densely granulose pronotum.
The holotype was found on a dead wood with fungi of Polyporaceae in the forest (Fig.
The variation of color in male and female could be caused by fading or differences between male and female individuals; we are not sure. The aedeagus of the holotype and the ovipositor of the paratype are somewhat damaged.
Holotype: ♀ (MHBU) (Fig.
This species is closely related to C. granulata sp. nov. and C. metallica (Champion, 1916), but can be distinguished by the following characters (based on female): dorsal side of body blue-violet; pronotum densely granulate, except coarsely punctured in anterior half of disc; scutellum yellow; lateral margins of paraproct of ovipositor nearly straight, proctiger almost as long as gonocoxites, gonostylus with long setae.
Dorsal side of body blue-violet, antennae, femora, tibiae and ventral side of body dark blue, some individuals with sternum and abdomen blue. Scutellum yellow, around scutellum with distinct dark-blue metallic sheen on elytra. Body with dense and black erect pubescence, dorsally and ventrally. Scutellum with dense and decumbent yellow pubescence.
Female. Head small, length 1.0 mm, width 1.6 mm, densely and finely punctured, dorsal surface with narrowly, longitudinal median depression. Eyes lateral, large and protruding, ratio of eye diameter to interocular space 1.0: 2.0. Maxillary palpomere II elongate-triangular, III suborbiculate, IV obliquely rounded at apex, sides subparallel, surface of extend part somewhat rough and dull, no shining. Antennae (Fig.
Pronotum (Fig.
Elytra broadly oval, length 7.4 mm, width 5.0 mm, much wider than pronotum. Disc convex, depressed from middle to humeri along lateral margins. Surface with tiny punctures and irregular large punctures.
Abdomen (Fig.
Legs slender and long. Length of metafemora 2.7 mm, metatibiae 2.6 mm.
Ovipositor (Figs
Diagnostic characters separating type species and two new species (based on females).
C. metallica | C. granulata sp. nov. | C. hirtiscutellara sp. nov. | |
---|---|---|---|
Color of dorsal side | Blue | Green-blue | Blue-violet |
Antennomere | V evidently longer than VI | V nearly as long as VI | V evidently longer than VI |
Pronotum | Densely and coarsely punctured | Densely granulate | More densely granulate, except coarsely punctured in anterior half of pronotal disc |
Color of scutellum | Bronzed or reddish bronzed | Bronzed | Yellow |
Punctures of elytral suface | Irregular | Large punctures nearly in rows | Irregular |
Posterior margin of abdominal ventrite V | More narrow | More broad | More narrow |
Paraproct | 1.4 times as long as wide | 1.7 times as long as wide | 1.4 times as long as wide |
Proctiger | Longer than gonocoxites | Almost as long as gonocoxites | Almost as long as gonocoxites |
Gonostylus | Without setae | Lost in dissection | With long setae |
Distribution | Northern India and Bhutan | China (Xizang) | China (Yunnan) |
China: Yunnan.
This species is named from the Latin hirtus and scutella, in reference to the dense decumbent pubescence on the scutellum.
As far as we know, Cyanopenthe species inhabit moist and warm forest habitats, and feed on fungi of Polyporaceae at night in small aggregations or alone; all known species occur in Bhutan, China (Taiwan, Xizang, Yunnan), northern India and northwestern Thailand of Southeast Asia. We believe that more species may be discovered in the Himalayas, Myanmar, Laos, Vietnam and Southern China in the future.
We are grateful to IZCAS which provided a paratype, and to doctoral student Zhonghua Wei (College of Life Sciences, Hebei University) who collected a holotype. We thank Dr Zhao Pan (College of Life Sciences, Hebei University) and doctoral student Xinglong Bai (College of Life Sciences, Hebei University) for reading a draft of this paper and making helpful suggestions. We are also thankful for Dr Linxiao Chang (Beijing Natural History Museum) who helped to take habitat photographs of the specimens. This study was supported financially by the National Natural Science Foundation of China (No. 31572309).