ZooKeys 116: 15–24, doi: 10.3897/ZooKeys.116.1329
On the Chinese species of the genus Intestinarius Kurbatov (Coleoptera, Staphylinidae, Pselaphinae)
Zi-Wei Yin, Li-Zhen Li, Mei-Jun Zhao§
Department of Biology, College of Life and Environmental Sciences, Shanghai Normal University, Shanghai, 200234, P. R. China

Corresponding author: Mei-Jun Zhao (mjzhao@shnu.edu.cn).

Academic editor: Roberto Poggi

received 31 March 2011 | accepted 7 June 2011 | Published 7 July 2011

(C) 2011 Zi-Wei Yin. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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A total of three Chinese species of the genus Intestinarius Kurbatov, 2007 are recognized, among which, two new species are described: Intestinarius guangdongensis sp. n. from Guangdongand Intestinarius longiceps sp. n. from Guizhou. Illustrations of major diagnostic characters are given for all three Chinese species including Intestinarius kuzmini Kurbatov, 2007. A key is included to aid in their identification.


Coleoptera, Staphylinidae, Pselaphinae, Intestinarius, new species, key, taxonomy, China


Eight species of the genus Intestinarius Kurbatov, 2007 (type species: Batrisodes quinquesulcatus Raffray, 1904) have been so far known from the Southeast Asia: one from Indonesia, two from Laos, three from Malaysia, one from both Singapore and Malaysia and one from China. Intestinarius was thought to be closely allied to Mnia Newton & Chandler, 1989 by certain shared morphological characters (Kurbatov 2007: 282; referring to Mnia see Löbl (1973)) and may be distinguished from Mnia by the presence of well-defined longitudinal sulci on the head and pronotum, by the first antennomere not remarkably elongate, by each elytron with three basal foveae, and by the sternite IV without discal carinae (basolateral incisions in Kurbatov (2007)).

Species of Intestinarius are morphologically similar and the correct identification must be based on the study of male sexual characters. In the present study, we found that characters on female genitalia may also provide a faithful identification.

During several recent collecting trips conducted in South and Southwest China, the authors and their colleagues collected some Intestinarius specimens in Guangdong, Guizhou, and Yunnan Provinces which prove to be two new and one known species. The purpose of this paper is to describe the new species, to provide illustrations of major diagnostic characters and a key for the identification of the so far known Chinese species.

Material and methods

All specimens were collected from the leaf litter of the forest floor by sifting. They were killed with ethylacetate and then dried. Dissections were done in 75% ethanol. The genital organs and other dissected parts were mounted in Euparal (Chroma Geselschaft Schmidt, Koengen, Germany) on plastic slides that were placed on the same pin as the specimen. Photos were taken by a Canon EOS 40D Camera mounted with an MP-E 65 mm Macro Photo Lens or by a Canon G9 Camera mounted on an Olympus CX31 microscope; line drawings were made using Adobe Illustrator CS2.

Slash (/) is used to separate different lines on the same label. The terminology of foveal system follows Chandler (2001).

The following acronyms are used in the text:

BL length of body (= hl+pl+el+al)

HL maximum length of head, measured from anterior margin of clypeus to posterior base, excluding occiput

HW maximum width of head, measured across eyes

PL length of pronotum, measured along midline

PW maximum with of pronotum

EL length of elytra, measured along sutural line

EW maximum width of elytra

AL maximum length of abdomen

AW maximum width of abdomen.

Measurements were made based on a random sample of 45 specimens, unite is in millimeter.

All specimens studied are deposited in the Insect Collection of Shanghai Normal University, Shanghai, China (SNUC).

Intestinarius guangdongensis Yin and Li, sp. n.


Figs 1, 3, 6, 9, 12, 15–22, 39–40, 45–46
Type locality.

Nan-ling National Nature Reserve, Guangdong Province, South China

Type material

(7 ♂♂, 5 ♀♀). Holotype: ♂, labelled ‘CHINA: guangdong Prov. / Shaoguan City / Nanling National N. R. / 09.viii.2010 / Li-Zhen LI leg.’; Paratypes: 6 ♂♂, 5 ♀♀, same label data as holotype.


Measurements: male (female). BL 2.62–2.72 (2.40–2.56), HL 0.58–0.63 (0.58–0.60), HW 0.52–0.55 (0.49–0.50), PL 0.56–0.58 (0.55–0.56), PW 0.58–0.59 (0.53–0.57), EL 0.87–0.89 (0.77–0.78), EW 0.93–0.94 (0.84–0.88), AL 0.61–0.62 (0.50–0.62), AW 0.83–0.85 (0.80–0.81). Length of aedeagus 0.41. Width of female genitalia 0.32.

Male (Fig. 1). Reddish-brown, maxillary palpi and tarsi lighter. Head, pronotum and elytra covered with long setae. Head (Fig. 3) slightly longer than wide. Clypeus short in dorsal view, roundly arcuate on anterior margin; frons markedly impressed between profoundly raised antennal tubercles; vertexal foveae situated backwards, vertexal sulci extended from vertexal foveae to frons; carinae lateral to the vertexal sulci derived from base of antennal tubercles well-defined; occipital carina reaching posterior margin of frontal impression; postocular margins moderately long, nearly straight, gradually narrowed toward base. Eyes well-developed, each comprised of about 25 facets. Fourth palpomere of maxillary palpi with tuft of dense and fine external setae. Gular carina not conjoint with gular fovea. Antennae as in Fig. 6. Pronotum (Fig. 3) about as long as wide, median longitudinal sulcus extended beyond transverse antebasal sulcus, two lateral longitudinal sulci well-defined, exterior one born from lateral antebasal foveae; two pairs of basolateral foveae and two pairs of antebasal conical tubercles well-defined. Each elytron with three basal foveae and complete sutural stria; discal stria short, reaching less than half of elytral length. Mesotrochanters slightly protuberant on posterior margin, mesotibiae without apical protuberance; metatrochanters modified (Fig. 12), setose on posterior margin.

Abdomen with tergite IV largest, V–VI about same length and successively narrowed, tergite (Figs 15–16) VII modified, provided with median small round impression, tuft of long setae directed toward posterior margin; tergite VIII as in Fig. 17; sternite VIII as in Fig. 18; sternite IX as in Fig. 19; aedeagus as in Figs 20–22.

Female. Slightly smaller than male; each eye comprised of about 15 facets; maxillary palpi, legs and tergite VII lacking modifications; tergite VIII as in Fig. 39; sternite VIII as in Fig. 40; female genitalia as in Figs 45–46.

Figures 1–2.

Male habitus of Intestinarius spp. 1 Intestinarius guangdongensis 2 Intestinarius longiceps. Scales: 1.0 mm.

Figures 3–5.

Head and pronotum of Intestinarius spp., male. 3 Intestinarius guangdongensis 4 Intestinarius kuzmini 5 Intestinarius longiceps. Scales: 0.3 mm.

Figures 6–14.

Details of Intestinarius spp., male. 6–8 antenna 9–11 mesotibia 12–14 metatrochanter 6, 9, 12 Intestinarius guangdongensis 7, 10, 13 Intestinarius kuzmini 8, 11, 14 Intestinarius longiceps. Scales: a–c = 0.3 mm, d–f = 0.2 mm, g–i = 0.1 mm.

Distribution. Known only from the type locality.

Etymology. The species is named after its type locality.

Ramarks. The modified maxillary palpomere IV of the new species is shared only with Intestinarius quinquesulcatus, type species of the genus, described from Singapore and Maylasia; the unmodified male mesotibiae is similar to that of Intestinarius orthopygium (Laos); the modified metatrochanters resemble those of Intestinarius distorticeps (Jawa), Intestinarius quinquesulcatus, Intestinarius kuzmini (Yunnan, China), Intestinarius orthopygium, Intestinarius crassicornis (Laos) and Intestinarius longiceps sp. n. (Guizhou, China); the modified tergite VII also occurs in most species of the genus except for Intestinarius distorticeps and Intestinarius pexatus. Intestinarius guangdongensis may be dintinguished from all its congeners by a combination of the following characters: simple mesotibiae, shape of modified metatrochanters and shape of sternite VIII in male, shape of female tergite and sternite VIII and genital organs of both sexes.

One female specimen has tergite VII with median protuberance, but it is identical to other females in all characters including female genitalia. Thus, females of this species are most probably polymorphic in this character. Such polymorphism in Intestinarius kuzmini was also observed in Kurbatov (2007: 284) and in the present study (see remarks under Intestinarius kuzmini).

Intestinarius kuzmini Kurbatov


Figs 4, 7, 10, 13,23–30, 41–42, 47–48
Intestinarius kuzmini Kurbatov, 2007: 283
Type locality.

Mengyang Nature Reserve, South Yunnan Province, Southwest China.

Material studied

(13 ♂♂, 9 ♀♀). 4 ♂♂ (1 ♂ with only aedeagus remained in Euparal), 2 ♀♀, labelled ‘CHINA: yunnan Prov. / Na-Ban-He N. R. / Xiao-nuo-you-xia-zhai / 20.ix.2008, alt. 950 m / HU & TANG leg.’; 5 ♂♂, 5 ♀♀, same, but ‘9.ix.2008, alt. 1, 500 m’; 3 ♂♂, same, but ‘Man-fei / 18.ix.2008, alt. ca. 600 m’; 1 ♀, same, but ‘Guo-men-shan / 21.xi.2008, alt. ca 1, 000 m / HU & TANG leg.’; 1 ♂, same, but ’08.v.2009, alt. 1, 200 m / HU & YIN leg.’; 1 ♀, same, but ‘05.i.2004 / LI & TANG leg.’.


Measurements: male (female). BL 2.55–2.61 (2.42–2.57), HL 0.56–0.58 (0.55–0.56), HW 0.51–0.52 (0.50–0.51), PL 0.57–0.58 (0.56–0.57), PW 0.56–0.57 (0.55–0.56), EL 0.81–0.82 (0.73–0.75), EW 0.89–0.92 (0.90–0.92), AL 0.61–0.63 (0.58–0.69), AW 0.83–0.85 (0.86–0.88). Length of aedeagus 0.52. Width of female genitalia 0.28.

Eyes of male comprised of about 25 facets, of female of about 15 facets.

Detailed description of Intestinarius kuzmini refers to Kurbatov 2007: 283–284. Additional illustrations of the following major diagnostic characters are provided. Male: head and pronotum (Fig. 4), left antenna (Fig. 7), modified mesotibia (Fig. 10) and metatrochanter (Fig. 13), tergite VII (Fig. 23–24), tergite VIII (Fig. 25), sternite VIII (Fig. 26), sternite IX (Fig. 27) and aedeagus (Figs 28–30). Female: tergite VIII (Fig. 41), sternite VIII (Fig. 42) and genitalia (Figs 47–48).

Figures 15–22.

Details of Intestinarius guangdongensis, male. 15 tergite VII 16 same, anterior view 17 tergite VIII 18 sternite VIII 19 sternite IX 20 aedeagus, lateral view 21–22 same, dorsal view. Scales: 0.2 mm (scale with ‘*’ = 0.1 mm).

Figures 23–30.

Details of Intestinarius kuzmini, male. 23 tergite VII 24 same, anterior view 25 tergite VIII 26 sternite VIII 27 sternite IX 28 aedeagus, lateral view 29–30 same, dorsal view. Scales: 0.2 mm (scale with ‘*’ = 0.1 mm).

Figures 31–38.

Details of Intestinarius longiceps, male. 31 tergite VII 32 same, anterior view 33 tergite VIII 34 sternite VIII 35 sternite IX 36 aedeagus, lateral view 37–38 same, dorsal view. Scales: 0.2 mm (scale with ‘*’ = 0.1 mm).


Known from Meng-yang and Na-ban-he Nature Reserves of Yunnan Province, Southwest China.


Intestinarius kuzmini is similar to its Chinese congeners with respect to the sexually modified tergite VII and metatrochanter. Male of this species may be distinguished by having long apical tooth on mesotibiae, by the shape of modified metatrochanter and by the shape of aedeagus; females may be identified based on the shape of tergite VIII, sternite VIII and genitalia.

Seven females out of nine studied have tergite VII with short, blunt to long, sharp median protuberance, but all morphological characters including genitalia are identical also with those two specimens lacking modified tergite VII. Thus, we believe that in some species of Intestinarius, females are most probably polymorphic in this character. (see also remarks under Intestinarius guangdongensis).

Intestinarius longiceps Yin and Li, sp. n.



Figs 2, 5, 8, 11, 14, 31–38, 43–44, 49–50
Type locality.

Kuankuoshui Nature Reserve, Guizhou Province, Southwest China

Type material

(2 ♂♂, 10 ♀♀). Holotype: ♂, labelled ‘CHINA: Guizhou Prov. / Kuankuoshui N. R. / Baishaogou / 04.vi.2010 / alt. 700 m / YIN & ZHAI leg.’; Paratypes: 1 ♂, 8 ♀♀, same label data as holotype; 1 ♀, same, but ‘750–900 m / 05.vi.2010 / YIN & ZHAI leg.’; 1 ♀, same, but ‘03.vi.2010 / alt. 700 m’.


Measurements: male (female). BL 2.54–2.63 (2.49–2.57), HL 0.59–0.60 (0.59–0.62), HW 0.51–0.52 (0.51–0.52), PL 0.56–0.57 (0.55–0.56), PW 0.55–0.57 (0.55–0.56), EL 0.74–0.75 (0.73–0.75), EW 0.90–0.91 (0.85–0.88), AL 0.63–0.69 (0.61–0.64), AW 0.76–0.80 (0.78–0.80). Length of aedeagus 0.50. Width of female genitalia 0.27.

General morphology similar to Intestinarius guangdongensis sp. n., but it differs in the followings: Male maxillary palpomere IV not modified; postocular margins remarkably long; antennae (Fig. 8) more robust; mesotibiae (Fig. 11) constricted in apical portion, apical tooth slightly shorter than first tarsomere; metatrochanter (Fig. 14) on posterior margin with broad protuberance, not setose; tergite VII as in Figs 31–32; tergite VIII as in Fig. 33; sternite VIII as in Fig. 34; sternite IX as in Fig. 35; aedeagus as in Figs 36–38; female tergite VIII as in Fig. 43; sternite VIII as in Fig. 44; genitalia as in Figs 49–50.

Figures 39–50.

Details of Intestinarius spp., female. 39, 41, 43 tergite VIII 40, 42, 44 sternite VIII 45, 47, 49 female genitalia, posterior view 46, 48, 50 same, dorsal view 39, 40, 45, 46 Intestinarius guangdongensis 41, 42, 47, 48 Intestinarius kuzmini 43, 44, 49, 50 Intestinarius longiceps.


Known only from the type locality.


The new species is named after its long postocular margins.


The new species may be distinguished from all its congeners by the combination of the male secondary sexual characters, viz. the mesotibiae and metatrochanter, the tergites VII–VIII and the sternites VIII–IX, and the shapes of male and female genitalia.

Key to Chinese species of the genus Intestinarius Kurbatov

All the Chinese species are externally very similar, thus, a faithful identification must be based on the dissection of the male and female genital organs combined with certain male secondary sexual characters included in the following key.

1 Male: fourth maxillary palpomere with tuft of dense and short setae on exterior margin; mesotibiae lacking apical protuberance (Fig. 9); aedeagus robust, shape as in Figs 20–22. Female: sternite VIII as in fig. 40, female genitalia membranous in most parts, shape as in Figs 45–46. (Guangdong) Intestinarius guangdongensis sp. n.
Male: maxillary palpi unmodified, mesotibiae with apical protuberance; aedeagus elongate, not fitting above. Female: sternite VIII not as in Fig. 40, female genitalia weekly sclerotized in most parts, structure not as above 2
2 Postocular margins not straight, shorter than anterior half of head (Fig. 4). Male: apical protuberance of mesotibiae much longer than first tarsomere (Fig. 10), metatrochanters on posterior margin with apically narrowed and abruptly curved thick spine, setose (Fig. 13), aedeagus as in Figs 28–30 (also see Kurbatov 2007: 284, fig. 12). Female: tergite VIII with median prominence (Fig. 41) and tergite VIII with median emargination (Fig. 42) on each posterior margin; female genitalia as in Figs 47–48. (Yunnan) Intestinarius kuzmini Kurbatov
Postocular margins straight, about as long as anterior half of head (Fig. 5). Male: apical protuberance of mesotibiae slightly shorter than first tasomere (Fig. 11), metatrochanters on posterior margin with apically broad protuberance, lacking setae (Fig. 14), aedeagus as in Figs 36–38. Female: tergite VIII with posterior margin almost flat (Fig. 43), sternite VIII not emarginated medially (Fig. 43), female genitalia as in Figs 49–50. (Guizhou) Intestinarius longiceps sp. n.

The authors thank Drs. S. A. Kurbatov and Ivan Löbl for sending reprints of their papers. The collectors mentioned in the text are acknowledged for making the specimens available to the present study. Sincere thanks also go to the two anonymous reviewers who provided valuable comments on this manuscript. The present study is supported by the National Natural Science Foundation of China (No. 30870323) and the Shanghai Natural Science Foundation (No. 10ZR1421600).

Chandler DS (2001) Biology, morphology, and systematics of the ant-like litter beetles of Australia (Coleoptera: Staphylinidae: Pselaphinae). Memoirs on Entomology International 15:1-560.
Kurbatov SA (2007) Revision of the genus Intestinarius gen. n. from Southeast Asia, with notes on a probable autapomorphy of Batrisitae (Coleoptera: Staphylinidae: Pselaphinae). Russian Entomological Journal 16 (3):281-295.
Löbl I (1973) Revision der gattung Mina Raffray (Coleoptera, Pselaphidae). Revue Suisse de Zoologie 80 (1):151-206.
Raffray A (1904) Genera et catalogue des Psélaphides. Annales de la Société Entomologique de France 73:1-400.