Ciconia (福井県自然保護センター研究報告)

11:44−48 (2006)

Notes on the Genus Euconnus (Insecta: Coleoptera: Scydmaenidae)
from Tsumadaira Wetland, Fukui Pref., Honshu, Japan
Hideto Hoshina
Abstract. A new species, Euconnus (Euconnus) ohnoensis sp. nov., is described. Euconnus (Pycnophus) impar
Sharp, 1886 is recorded for the first time from the Hokuriku Region, Japan.
Introduction
The genus Euconnus Thomson, 1859 is composed of about 2500 species world wide (Newton & Franz, 1998).
Ten species have been recorded from Japan (Sharp, 1874; 1886; Franz, 1976; O’Keefe & Li, 1998; Hoshina et al.,
2003; Hoshina & Arai, 2003). Some Japanese species of Euconnus, described by Sharp (1874 and 1886), probably
inhabit marsh environments (Hoshina, 2003). However, those species are rare and rarely collected and in general
the Japanese wetland fauna of Scydmaenidae is poorly known.
In 2003-2004, I carried out a field survey of eight visits at Tsumadaira Wetland, Fukui Pref., Honshu, Japan,and finally succeeded in collecting two specimens of Euconnus. Careful examination revealed one of these specimens belongs to a new species of Euconnus, and another is Euconnus (Pycnophus) impar Sharp, 1886 which has
not previously been recorded from the Hokuriku Region including Fukui Pref. In this paper, I describe that newspecies under the name, Euconnus (Euconnus) ohnoensis sp. nov., and record a known species, E. (P.) impar,from Fukui Pref.
The holotype designated in this study is deposited in the collection of the Museum of Nature and Human
Activities, Hyôgo (MNHA).
Euconnus (Euconnus) ohnoensis Hoshina, sp. nov.
(Japanese name: Rokuroshi-hime-kokemushi)(Figs. 1-6)
Distribution. Japan: Honshu (Fukui Pref.).
Type series. Holotype: male, Tsumadaira Wetland, Minami-rokuroshi, Ôno City, Fukui Pref., 27. vi. 2003, H.
Hoshina leg. (MNHA).
Related specimens examined. Eight syntypes of Euconnus japonicus (Sharp, 1874) (preserved in the collectionof The Natural History Museum, London).
Diagnosis. Euconnus (Euconnus) ohnoensis sp. nov. has typical morphological features of subgenus Euconnus
in general. Body is 1.4 mm in length and reddish brown. Dorsum impunctate. Head almost glabrous. Elytra havesparse long pubescence. Hind wings are well developed. Aedeagus has a large horny process.
Measurement: Body 1.4 mm long; head 0.22 mm long (from clypeus to base) and 0.30 mm wide; pronotum
Department of Regional Environment, Faculty of Education & Regional Studies,
Fukui University, Fukui City, 910-8507 Japan― 44 ―

0.40 mm long and 0.32 mm wide; elytra 0.80 mm long and 0.58 mm wide.
Coloration. Dorsum shining, almost concolorous, reddish brown; head a little lighter than pronotum and elytra;
maxillary palpus very light brown; antennal segments brown but 1st segment a little darker than the rest; mesoand metasterna reddish brown except for a black median carina of mesosternum; venter otherwise brown; hindcoxae slightly reddish brown, all tibiae and tarsi light brown, other parts of legs brown.
Head constricted behind eyes and lateral margins weakly curved towards base, slightly narrower than pronotum(Fig. 1), weakly and simply raised on vertex; surface of head smooth, impunctate, and almost glabrous except fora few setae on occiput; eyes oval, and about 0.33 times as long as head; inter-occipital distance about half as wide
as the maximal width of head; labrum almost straight at anterior margin, bearing sparse long hairs; mentum
smooth and impunctate; antennae 0.79 mm in length, with an indistinct four segmented club; all segments longer
than wide; 11th segment long-oval with a pointed tip (Fig. 3).
Pronotum strongly convex, widest at near base, sparsely pubescent, impunctate, smooth, with dense, stiff andthick setae along lateral margins; anterior margin almost straight; lateral margins and posterior margin feebly
curved; basal two foveae distinct (Fig. 2); basal transverse groove absent.
Elytra widest at about basal 2/5 in dorsal view, almost smooth, impunctate, and with long moderately scatteredpubescence; pubescence of elytra longer than those of head and pronotum (Fig. 1); each elytron without basal depressions and with two small basal pits located closer to scutellum than lateral margins (Fig. 2); external pits situated more outlying than foveae of pronotum; sutural striae present only in the base towards the basal 1/4 of elytra(Fig. 2).

Fig. 1. Habitus of Euconnus (Euconnus) ohnoensis sp. nov. Scale: 1 mm.

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Figs. 2-6. Euconnus (Euconnus) ohnoensis sp. nov. 2, body. 3, antenna. 4-6, aedeagus. 4, ventral view; 5, dorsalview; 6, lateral view. Scale A: 1 mm for Fig. 2. Scale B: 0.5 mm for Fig. 3. Scale C: 0.2 mm for Figs. 4-6.
Hind wings normal.
Legs similar to those of other species of subgenus Euconnus; hind coxae distant from each other at intervals ofhalf of length of hind coax; front tibiae almost as long as middle tibiae; hind tibiae about 1.2 times as long as
front tibiae; all tibiae thin, sharply narrowed from about basal 1/3 position towards base.
Metasternum strongly convex, moderately pubescent but almost glabrous on central area, smooth, and impunctate;venter densely pubescent and weakly microreticulate.
Aedeagus robust (Figs. 4-6); length of median lobe about 0.32 mm and width 0.18 mm in ventral view; apexof median lobe deeply and broadly emarginated with protuberant apico-lateral corners, and moderately curved alonglateral margins in ventral and dorsal views, strongly and apically expanded as a horn near the middle of apical― 46 ―

margins in ventral view; each paramere slender, not pointed at apex, with two apical setae, and sinuate in ventral
view and strongly curved in lateral view; horny process large and triangular in dorsal view and feebly reflexeddorsally in lateral view.
Remarks.

Euconnus (Euconnus) ohnoensis sp. nov. is similar to Euconnus japonicus (Sharp, 1874), but thebody is 1.4 mm in length, dorsal color reddish brown, and the median lobe of aedeagus robust, 1.8 times as longas wide in ventral view. In contrast, Euconnus japonicus has the body about 1.6 mm in length, light brown tobrown dorsal color, and the slender median lobe about 2.5 times as long as wide.
Etymology. This specific epithet is derived from the type locality, Ôno City.
Euconnus (Pycnophus) impar Sharp, 1886
(Japanese name: Bandô-tsuya-hime-kokemushi)
Euconnus impar Sharp, 1886, 46; Csiki, 1919: 49; Franz, 1976: 59; O’Keefe & Li, 1998: 159; Hoshina & Arai,
2003: 11.
Euconnus (Pycnophus) otorii: Hoshina et al., 2003: 30; Hoshina & Arai, 2003: 11 (= Euconnus impar).
Specimens examined. 1 male, Tsumadaira Wetland, Minami-rokuroshi, Ôno City, Fukui Pref., 29. vi.-6. vii.
2004, H. Hoshina leg. (collected by the flight intercept traps).
Note. This is the first record of this species from the Hokuriku Region.
Acknowledgements
I wish to express my sincere gratitude to Mr. Jonathan Cooter (England) who kindly read my early draft. I also
owe thanks to Dr. Martin Brendell (The Natural History Museum, London) who provided me with the opportunity
to examine the type specimens.
要約

保科英人：福井県大野市妻平湿原から採集された鞘翅目コケムシ科 Euconnus 属 (ヒメコケムシ属) に関する知見
2003〜2004 年にかけて､ 大野市南六呂師妻平湿原で､ 採集を行ったところ､ 湿地性コケムシ科 Euconnus属 (ヒメコケムシ属) の 2 個体が採集された｡ このうち､ 1 頭は未記載種であることが判明し､ Euconnus(Euconnus) ohnoensis sp. nov.

(和名：ロクロシヒメコケムシ) と命名・記載した｡ また､ 残りの 1 頭は､北陸地域未記録の種 Euconnus (Pycnophus) impar Sharp, 1886 であることがわかり､ 本稿にて記録した｡
References
Csiki, E., 1919. Scydmaenidae. In: Schenkling, S. (ed.). Coleopterorum Catalogus, pars 12: 1-106. W. Junk,Berlin.
Franz, H., 1976. Neue Scydmaeniden aus Japan, sowie Bemerkungen zu bekannten Arten. Entomologische Blätter
für Biologie und Systematik der Käfer, 72: 51-60.
Hoshina, H., 2003. Notes on the genus Euconnus (Coleoptera: Scydmaenidae) from Japan, part I. Coleopterists’News, Tokyo, (143): 7-11. (in Japanese)― 47 ―

Hoshina, H., S. Arai, & H. Ushijima, 2003. Descriptions of two new species of the genus Euconnus (Coleoptera:Scydmaenidae) from Japan. The Entomological Review of Japan, 58: 27-33.
Hoshina, H. & S. Arai, 2003. Taxonomic note on the genus Euconnus (Coleoptera: Scydmaenidae) from Japan.
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Newton, A. F. & H. Franz, 1998. World catalog of the genera of Scydmaenidae (Coleoptera). KoleopterologischeRundschau, 68: 137-165.
O’Keefe, S. T. & K.-J. Li, 1998. Review of the Scydmaenidae (Coleoptera) of eastern Asia, with particular reference to Scydmaenus, and description of the first scydmaenid from Hainan Island, China. Journal of the New
York Entomological Society, 106: 150-162.
Sharp, D., 1874. The Pselaphidae and Scydmaenidae of Japan. Transactions of the Entomological Society ofLondon, (1874): 105-129.
Sharp, D., 1886. The Scydmaenidae of Japan. Entomologist’s Monthly Magazine, 23: 46-51.
Key words: Coleoptera, Scydmaenidae, the genus Euconnus, new species, Tsumadaira Wetland, Japan― 48 ―