New record of the little-known genus Otoblastus (Hymenoptera

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Journal of National Park Research Vol. 12, No. 2

New record of the little-known genus Otoblastus (Hymenoptera: Ichneumonidae: Tryphoninae)

in South Korea

Jin-Kyung Choi^*

Insect Inquiry⋅Education Institute, Department of Science Education, Daegu National University of Education, Daegu, 42411, South Korea

한국산 오토뭉툭맵시벌속(벌목: 맵시벌과: 뭉툭맵시벌아과)의 미기록종 보고

최진경

^*

대구교육대학교 과학교육과 곤충탐구⋅교육연구소

Abstract: One species of the genus Otoblastus Förster, 1869 belonging to the subfamily Tryphoninae, family Ichneumonidae, is reported in South Korea for the first time. Previously, only one species, Otoblastus marginator Kasparyan,1982, had been recorded in South Korea. In the present study, we present the diagnosis, photographs of the South Korean Otoblastus maculator Kasparyan, 1999, and a modified key to species from Palaearctic region.

Key words ichneumon fly, parasitoid, taxonomy

요약: 뭉툭맵시벌아과(Subfamily Tryphoninae), 오토뭉툭맵시벌속(genus Otoblastus)에 속하는 1미기록종 Otoblastus maculator (노 란얼굴오토뭉툭맵시벌(신칭))를 보고하고자 한다. 오토뭉툭맵시벌속은 전세계 6종만이 기록되어 있는 매우 작은 그룹이며, 이 중 한국산 오토 뭉툭맵시벌속은 O. marginator 1종만이 보고되어 왔다. 본 연구에서는 이번 연구를 통해 확인된 O. maculator의 진단기재, 사진과 더불어 구북구지역에 분포하는 본 속의 4종에 대한 검색표를 제공한다.

주요어: 맵시벌류, 기생벌, 분류

Introduction

The genus Otoblastus (Ichneumonidae: Tryphoninae) is rare in collections and was first described by Förster in 1869 based on Tryphon luteomarginatus. The world fauna of this genus comprises of only six species: one of which was reported in South Korea (Kasparyan, 1982;

Yu et al., 2016). Taxonomic studies of this Otoblastus in South Korea are scarce (Kasparyan, 1982; Lee & Cha 1996, 2000). Only a female specimen and 12 males of

Otoblastus marginator were recorded in Suwon by Kasparyan in 1982. According to Kasparyan (1982), this species is a parasite of Tomostethus sp. n. on the plant of Fraxinus. In the Palaearctic, four species of this genus have been recorded and this genus was known to be a parasite of sawflies (Yu et al., 2016).

In the present study, the diagnosis of Otoblastus maculator, photos of diagnostic characters, and a key to species of the modified Palaearctic Otoblastus are provided.

Received 15 July 2021; Revised 10 September 2021; Accepted 17 November 2021

Journal of National Park Research Vol. 12, No. 2, November 2021, 25-28

ISSN 2093-0674 / https://doi.org/10.54406/jnpr.2021.12.2.025

JNPR

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Korea National Park Research Institute

Materials and Methods

The material used in this study was collected by Malaise trapping and was deposited in the National Institute of Biological Resources (NIBR, Incheon, South Korea). Morphological terminology follows Gauld (1991), and distributional data follows Yu et al. (2016). The specimen was examined using a Leica MC190 HD Camera attached to a Leica M125 Microscope (Leica Microsystems, Germany) with images, processed using LEICA LAS X software (Leica).

Taxonomic accounts

Family Ichneumonidae Latreille, 1802

맵시벌과

Subfamily Tryphoninae Shuckard, 1840

뭉툭맵시벌아과

Genus Otoblastus Förster, 1869

오토뭉툭맵시벌속

Otoblastus Förster, 1869: 135-221. Type species: Tryphon luteomarginatus Gravenhorst, 1829

Catocentrus Walsh, 1873: 65-166. Type species: Catocentrus philanthoides Walsh, 1873

Diagnosis. Distance between antennal sockets not more than 0.2 times as long as the diameter of a socket;

fore wing with areolet; first metasomal tergite short and weakly constricted to its base, with basolateral carinae;

epipleurum of tergites II-IV (especially III to IV) strong- ly narrow or almost absent; ovipositor and ovipositor sheath short.

Key to species of genus Otoblastus from Palaearctic (modified by Kasparyan, 1982, Kasparyan & Tolkanitz, 1999)

1. Scutellum and two spots on anterolateral margins of mesonotum, as well as broad border along hind

margin of metasomal tergites I-VII pale yellow;

face, clypeus, fore and mid legs, and hind tro- chanters bright yellow; antenna with 30-40 flagellomeres (Kasparyan, 1982: 141; Kasparyan &

Tolkanitz, 1999: 257). ···O. marginator - Scutellum and mesonotum completely black; an-

tenna with 19-25 flagellomeres. ··· 2 2. Face and clypeus completely black; metasomal ter-

gites completely black, sometimes with a narrow reddish-brown line on the posterior area (Kasparyan, 1982: 142; Kasparyan & Tolkanitz, 1999: 256). ···O. luteomarginatus

- Face and clypeus yellow to dark brown; metasomal tergites almost black but with yellow to brown spots. ··· 3 3. Face dark brown with brownish-yellow spot in the

middle part; clypeus yellow or darkened in basal half, without semicircular depression (Kasparyan, 1982: 142; Kasparyan & Tolkanitz, 1999: 257).

···O. lutoator - Face and clypeus completely yellow (Fig. 1B);

clypeus below with semicircular depression;

metasomal tergites I-IV (I and II in South Korean specimen) with large spots on the posterior margins (Fig. 1D) (Kasparyan & Tolkanitz, 1999: 256). ···O. maculator

Otoblastus maculator Kasparyan, 1999

노란얼굴오토뭉툭맵시벌(신칭) (Fig. 1)

Otoblastus maculator Kasparyan, in Kasparyan and Tolkanitz 1999: 258. Type: female; type locality: Russia (Primor’ye Kray).

Diagnosis.

Body generally black and yellow (Fig. 1A). Face completely yellow (Fig. 1B), finely punctate; clypeus yellow and wide, separated from face by a strong groove, apical margin of clypeus round with semicircular depres-

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27 New record of the little-known genus Otoblastus (Hymenoptera: Ichneumonidae: Tryphoninae) in South Korea

Journal of National Park Research Vol. 12, No. 2

sion; mandible yellow, upper tooth longer than lower;

malar space short, almost half of the basal width of mandible; frons and vertex black; occipital carina complete;

antenna flagellum dark brown dorsally and ventral part yellow, antenna with 23 flagellomeres. Mesosoma completely black (Fig. 1C); pronotum with epomia; meso- scutum with indistinct notauli; scutellum convex, scu- tellar lateral carinae reach to the middle of scutellum;

propodeum with distinct carinae. Fore leg yellow; mid and hind coxae, femora, apical parts of tibiae black. Fore wing with areolet; hind wing with six distal hamuli.

Metasoma black with yellow triangles on tergites I-II in dorsal view (Fig. 1D); tergite I with distinct lateral carina.

Material examined.

SOUTH KOREA: Gyeongsangbuk-do, Gyeongsan-si, Daehak-ro 280 Yeungnam Univ. N 35°49′11.6″ E 128°45′

53.6″, 2-7.V.2016, J.W. Lee, 1♂, (Deposited in NIBR).

Distribution.

South Korea (new record), Japan, Russia (Primor’ye Kray, Sakhalin Oblast).

Remarks.

This species is similar to O. marginator, but can be distinguished by the scutellum and mesonotum completely black (scutellum and anterolateral margin of mesonotum with two yellow spots in O. marginator); antenna with less than 25 flagellomeres (with more than 30 flagellomeres in O. marginator).

Acknowledgemnets

This work was supported by a grant from the National Institute of Biological Resources (NIBR), funded by the Ministry of Environment (MOE) of the Republic of Korea (NIBR202002205).

Fig. 1.Otoblastus maculator Kasparyan, 1999. (A) habitus of male in lateral view, (B) head in frontal view, (C) mesosoma in dorsal view, (D) metasoma in dorsal view. Scale bars: 0.5 mm.

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참고문헌

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Gravenhorst JLC. 1829. Ichneumonologia Europaea. Pars II.

p. 989. Vratislaviae.

Kasparyan DR, VI Tolkanitz. 1999. Ichneumonidae subfamily Tryphoninae: tribes Sphinctini, Phytodietini, Oedemopsini, Tryphonini (Addendum), Idiogrammatini. Subfamilies Eucerotinae, Adelognathinae (addendum), Townesioninae.

[Fauna of Russia and Neighbouring Countries. Insecta Hymenoptera.] Volume III. Number 3. p. 404. Saint Petersburg. Nauka.

Kasparyan DR. 1982. Eastern Palearctic Ichneumonids of the genera Monoblastus Htg. and Otobastus Frst. (Hymenoptera, Ichneumonidae). Entomologicheskoye Obozreniye. 61:

145-152. [Entomological Review. 61: 137-144]

Latreille PA. 1802. Histoire naturelle, générale et particulière, des Crustacés et des Insectes. Tome troisième. p. 468.

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Lee JW, JY Cha. 1996. Synonymic list and distribution of Tryphoninae (Hymenoptera) in Korea. Entomological Research Bulletin. 155-168.

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p. 261. Insects of Korea Series 6. Korea Research Institute of Bioscience and Biotechnology & Center for Insect Systematics. Korea.

Shuckard WE. 1840. Ichneumonides. p. 406, In The cabinet cyclopedia: on the history and natural arrangement of insects (Swainson W, Shuckard WE, eds.). London.

Walsh BD. 1873. Descriptions of North American Hymenoptera.

Transactions of the Academy of Sciences of St. Louis.

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www.taxapad.com. (Accessed 1 Feb 2021). Nepean, Ontario, Canada.