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Research Article
A new species of Aulacus (Hymenoptera, Aulacidae) from Hokkaido, Japan
expand article infoKeita Kuroda, Namiki Kikuchi§, Kazuhiko Konishi
‡ Ehime University, Matsuyama, Japan
§ Hokkaido University, Sapporo, Japan
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Abstract

Aulacus machaerophorus sp. n. is described from females collected in Sapporo, Hokkaido, Japan. This new species has some interesting characteristics such as a very short ovipositor, absence of a ventral lobe and ovipositor guide on hind coxa, and smooth and shiny axillula, and is considered to be closely related to Nearctic species, A. schiffi. A key to three Japanese species of Aulacus is given.

Keywords

Aulacidae, Aulacus, Evanioidea, Hymenoptera, new species, taxonomy

Introduction

Aulacus Jurine, 1807 is composed of 78 extant species and has been recorded from all biogeographical regions except Antarctica and the Afrotropical (Chen et al. 2016). Wasps of this family are koinobiont endoparasitoids and use Xiphydriidae (Hymenoptera) and Buprestidae and Cerambycidae (Coleoptera) as hosts (Chen et al. 2016; Jennings and Austin 2004; Smith 2001). Aulacidae consists of two genera, Aulacus and Pristaulacus. Aulacus is distinguished from Pristaulacus by the following features: occipital carina absent; tarsal claw with a basal tooth or none; pronotum without a dentiform process along latero-ventral margin; petiole slender, at least 2.5 times as long as wide. Aulacus is considered to be a paraphyletic group with respect to Pristaulacus (Turrisi et al. 2009).

Seven species of Aulacus have been recorded from the Palaearctic Region, with two from Japan, A. japonicus Konishi, 1990 from Iwate, Tohoku and A. uchidai Turrisi and Konishi 2011 from Hokkaido (Konishi 1990; Turrisi and Konishi 2011). Recently, we collected Aulacus specimens from Sapporo, Hokkaido, and found that they have distinctive and peculiar characteristics separate them the known species. Here we describe a new species based on these specimens.

Materials and methods

Specimens used in this study are dried except one which is preserved in 99% ethanol. They are deposited as follow: Hokkaido University Museum, Sapporo, Japan (SEHU); the Ehime University Museum, Matsuyama, Japan (EUM); and National Museum of Natural History, Smithsonian Institution, Washington, DC, USA (USNM). Morphological technical terms follow Huber and Sharkey (1993) and surface sculpture follows Eady (1968). The methods of measurements follow Konishi (1990) and Smith (2008), and measured traits are shown in Fig. 1. In this paper, we use the following abbreviations: OOL = distance between outer margin of posterior ocellus and eye; POL = distance between inner margins of posterior ocelli. Most photographs (Figs 114) were obtained at the Laboratory of Environmental Entomology, Ehime University, using a Nikon Digital Sight DS-Fi1 camera attached to a Leica S8APO stereomicroscope. Fig. 15 was taken under a digital microscope HiROX KH-1300 and the image captured with the 2D measurement software SHX-13M ver. 2.9.0. Several partially focused images were combined and post-processed using Adobe Photoshop® CS6.

Figure 1.

Methods for measurements of wing venation: a Rs between 1R and Rs+M b M between Rs+M and M+Cu.

Taxonomy

Aulacus Jurine

Aulacus Jurine, 1807: 89.

Type species

Aulacus striatus Jurine, 1807. By monotypy.

See Smith (2001) for complete synonymy.

Aulacus machaerophorus sp. n.

Figs 2, 3–7, 8–12, 13–14, 15

Holotype

♀ “43°2.85'N, 141°18.96'E, Mt. Maruyama, Chuo-ku, Sapporo-shi, Hokkaido, Japan”, labelled “JPN: Hokkaido, Sapporo-shi, Chuo-ku, Mt. Maruyama, 1. Aug. 2016, Keita Kuroda leg.” (EUM). Paratypes. Same location as holotype but different dates and collected by Namiki Kikuchi: 1 ♀, 27 July, 2015: 1 ♀, 10 August, 2015: 6 ♀, 31 July, 2016: 5 ♀, 1 August, 2016: 7 ♀, 2 August, 2016 (SEHU). 6 ♀, same data as holotype (3 ♀ in EUM and 3 ♀ in USNM). 6 ♀, same data as holotypes but different dates: 2 ♀, 31 July 2016: 4 ♀ (3 dried and 1 wet), 2 August 2016 (EUM).

Description of female

Length: 4.1–6.5 mm

Color: Black; median portion of mandible yellowish brown; apical 1/3 to entire scape yellowish brown; apical portion of pedicel yellowish brown; trochanter yellowish brown to black; basal and apical portions of femora yellowish brown; fore tibia yellowish brown; mid tibia yellowish brown, sometimes black with basal and apical portions yellowish brown; hind tibia with basal and apical portions yellowish brown; fore and middle tarsi yellowish brown to light yellowish brown; hind tarsus yellowish brown, sometimes dark yellowish brown; wings hyaline, stigma and veins black; setae silver, setae on mandible gold.

Head glossy (Figs 3–7), 0.6–0.7 times as long as wide; lower area of gena coriaceus; malar space 0.4–0.5 times as long as eye height; head length behind eye in dorsal view 0.4–0.5 times as long as eye height; lower interocular distance 1.2–1.4 times as long as eye height; posterior margin of head weakly concave in dorsal view; occiput and postocciput smooth with dense setae and punctures; temple smooth; vertex smooth, with setae and sparse punctures, coriaceus between eye and posterior ocellus; OOL:POL=1:1; frons coriaceus and sparsely punctate with setae; antennal socket situated at about lower level of eye, separated from anterior tentorial pit by its own diameter; face densely punctate with setae and coriaceus-granulate; clypeus granulate and densely punctate with setae, with a protuberance situated at middle of apical margin; punctures on face and clypeus much stronger and denser than on temple; mandible smooth, basal area and upper half with some setae; antenna (Fig. 7) with fine hairs, 3.1–4.4 times as long as head length; pedicel 1.4–1.9 times as long as wide; 1st flagellomere 3.0–4.0 time as long as wide, 0.6–0.7 time as long as 2nd.

Figure 2.

Aulacus machaerophorus sp. n. lateral habitus. Scale bar: 1.0 mm.

Figures 3–7.

Aulacus machaerophorus sp. n. 3 head, dorsal view 4 frons, frontal view 5 face, frontal view 6 head, lateral view 7 antenna, dorsal view. Scale bars: 0.5 mm (3–6), 1.0 mm (7).

Mesosoma glossy (Fig. 8 & Fig. 10), punctate with setae; propleuron reticulate rugose along dorsal edge, antero-dorsal portion reticulate rugose, canaliculate along ventral edge; upper pronotum with subtriangular smooth area surrounded by crenulate furrows, lower pronotum with punctures and dense setae; mesoscutum transversely strigate; notauli moderately narrow and canaliculate, meeting at posterior margin of mesoscutum; scutellum transversely strigate; axillula smooth, shiny; mesopleuron canaliculated-reticulate, epicnemium smooth, with some punctures and setae; mesosternum with dense setae and punctures, reticulate rugose; metanotum smooth, anterior half with canaliculate furrow except median 1/3 with longitudinal ridges; metapleuron reticulate rugose and sparsely punctate with setae; propodeum with dorsal surface rugose and anterior 1/4 with transverse canaliculate furrow, with lateral surface and posterior surface reticulate rugose.

Figures 8–12.

Aulacus machaerophorus sp. n. 8 mesosoma, lateral view 9 metasoma, dorsal view 10 mesosoma, dorsal view 11 hind coxa, lateral view 12 ovipositor. Scale bars: 1.0 mm.

Legs: Coxae setose and trans-strigate; hind coxa (Fig. 11) 1.9–2.3 times as long as wide, without ventral lobe and ovipositor guide; tibiae with dense setae and puncture; tarsi with dense spines and punctures; hind basitarsus 1.1–1.4 times as long as length of remaining tarsomeres combined; hind tarsal claw with a basal tooth.

Wings: Fore wing (Fig. 13) 3.1–5.1 mm long and 2.6–3.4 times as long as wide; stigma 2.3–3.8 times as long as wide, length of stigma basad r-rs 1.2–1.4 times as long as length of stigma distad r-rs; M+Cu with distal tubular portion as long as basal nontubular portion; cell M 1.9–3.0 times as long as wide; cell 1R 1.5–1.9 times as long as wide; Rs between 1R and Rs+M 1.7–2.8 times as long as M between Rs+M and M+Cu (Fig. 1); r-rs 0.7–1.0 times as long as stigma width; anteriorly 2/5 and posteriorly 1/10 of 2r-m distinct; Cu curved downward; hind wing (Fig. 14) weakly tapering toward rounded apex, 3.3–3.9 times as long as wide and with 3 hamuli; M of apical portion colored.

Figures 13–14.

Aulacus machaerophorus sp. n. 13 fore wing 14 hind wing. Scale bars: 0.5 mm.

Metasoma glossy (Fig. 10); petiole 2.1–3.2 times as long as wide; 1st tergum smooth; 1st sternum with strong longitudinal furrows; 2nd to 5th terga coriaceus and 2nd tergite without setae and punctures, 3rd to 7th terga with sparse setae and punctures; 2nd to 5th sterna coriaceus; ovipositor 0.8–1.1 mm long and 0.2–0.3 times as long as fore wing, 1.1–1.7 times as long as hind coxa; ovipositor (Fig. 12) strongly upcurved near apex and with some setae on dorsal valve near apex (Fig. 15); ovipositor sheath with dense short hairs; second gonocoxa with setae and punctures; apical portion of ovipositor sheath weakly enlarged and rounded.

Figure 15.

Aulacus machaerophorus sp. n. setae of ovipositor on dorsal valve near apex. Scale bar: 0.1 mm.

Male

Unknown.

Distribution

Japan (Hokkaido).

Biology

All specimens used in this study were collected on the tree trunk of a blighted broad leaf tree in a broad-leaved forest.

Etymology

From the Latin machaerophorus, meaning bearing a short sword. This new species has a short ovipositor like a short sword.

Remarks

This new species possesses the following peculiar features: frons without transverse carina and rugulose sculpture; axillula smooth, shiny; hind coxa without ventral lobe and ovipositor guide; ovipositor very short (0.2–0.3 times as long as fore wing); apical portion of ovipositor with some short setae.

In Aulacus species so far described, a Nearctic species, A. schiffi Smith, 1996 is considered to be most closely related to A. machaerophorus. They share the short ovipositor; hind coxa without projecting ventral lobe and ovipositor guide; smooth frons without transverse carina; and ovipositor with setae (Smith, personal communication). Among these characteristics, the presence or absence of setae on ovipositor has not been reported in other Aulacus species and therefore needs further examination. Aulacus machaerophorus can be separated from A. schiffi by the absence of diagonal carinae on the axillula, the shorter ovipositor (ovipositor is 0.5 times as long as fore wing in A. schiffi) and wing venation (A. schiffi has a longer discal cell, 2Rs+M between the discal and submarginal cells is much shorter, and 2r-m is absent). This relationship of A. machaerophorus and A. schiffi is suggest close relationships of some of the fauna and flora of eastern Asia and eastern North America. For example, relationship of North American and eastern Asian species of Strongylogaster (Tenthredinidae) (Smith and Naito 1995) and example of the flora see Tiffney (1985).

Other Palaearctic species have rugulose frons with transverse carina judging from figures in Chen et al. (2016) and Sundukov and Lelej (2015). On the other hand, Australian and Nearctic Aulacus species have the frons with or without transverse carinae and the hind coxa with or without a ventral lobe and ovipositor guide (Jennings et al. 2004; Smith 2008).

This new species can be distinguished from two Japanese species by the following key.

Key to Japanese species – females

1 Frons without transverse carina, smooth (Fig. 5); axillula smooth (Fig. 10); fore wing with anterior part of 2r-m (Fig. 1); hind coxa without ventral lobe and ovipositor guide (Fig. 11) A. machaerophorus sp. n.
Frons with transverse carinae, rugulose-foveolate or rugulose; axillula reticulate rugose; fore wing without anterior part of 2r-m; hind coxa with ventral lobe 2
2 Ovipositor 0.6–0.9 times as long as fore wing length; frons less extensively sculptured and weakly rugulose-foveolate A. uchidai Turrisi & Konishi
Ovipositor 0.4 times as long as fore wing length; frons rugulose A. japonicus Konishi

Acknowledgements

We would like to express our sincere thanks to Dr David R. Smith (USNM, Washington, D.C.) for valuable information of the characters of A. schiffi and critical reading of the manuscript. We are particularly grateful to Dr Masahito Kimura (SEHU, Sapporo) and Dr Hiroyuki Yoshitomi (EUM, Matsuyama) for their guidance.

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