Research Article |
Corresponding author: Yukinobu Nakatani ( nakatany@affrc.go.jp ) Academic editor: Alfred Wheeler
© 2018 Yukinobu Nakatani, Tomohide Yasunaga.
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:
Nakatani Y, Yasunaga T (2018) Two new deraeocorine plant bug species from Japan (Heteroptera, Miridae, Deraeocorinae). In: Wheeler Jr AG (Ed.) A Festschrift Recognizing Thomas J. Henry for a Lifetime of Contributions to Heteropteran Systematics. ZooKeys 796: 163-174. https://doi.org/10.3897/zookeys.796.21243
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Two new deraeocorine plant bug species, Fingulus henrytomi and Stethoconus takaii, are described from Japan. A color habitus image of live individuals and scanning electron micrographs are shown for each taxon to aid an unequivocal identification. A checklist and keys to species are also provided for Japanese Fingulus and Stethoconus.
Deraeocorinae , Fingulus , Heteroptera , Insecta , Japan, Miridae , new species, Stethoconus
The plant bug subfamily Deraeocorinae is the fifth largest in the family Miridae (
Specimens used in this present work were deposited in American Museum of Natural History, New York, USA (
Genus Fingulus Distant, 1904
F. collaris Miyamoto, 1965; Japan (Ryukyus; Ishigaki and Iriomote Islands), Laos, Thailand, India.
F. henrytomi sp. n.; Japan (Shikoku, Tsushima Island)
F. longicornis Miyamoto, 1965; Japan (Honshu, Shikoku, Kyushu, Ryukyus), Philippines (Mindanao)
F. takahashii Nakatani, Yasunaga & Takai, 2000; Japan (Ryukyus).
Genus Stethoconus Flor, 1861
S. japonicus, Schumacher, 1917: Japan (Honshu, Shikoku, Kyushu, Ryukyus), Russia (Primorye), Korea, China, USA (Maryland, adventive)
S. praefectus Distant, 1909: Japan (Ryukyus: Ishigaki and Iriomote Islands), China, Taiwan, India, Sri Lanka, USA (Florida, adventive)
S. takaii sp. n.: Japan (Honshu, Shikoku)
1 | Head paler than remainder of body; pronotal collar impunctate (Fig. |
2 |
– | Dorsum uniform in coloration; pronotal collar punctate (Fig. |
3 |
2 | Frons widely pale; yellowish-brown markings laterally at base of corium | F. henrytomi |
– | Frons gradually paler anteriorly; apical part of corium narrowly pale | F. collaris |
3 | Dorsum blackish brown; femora and basal tibiae dark brown | F. longicornis |
– | Dorsum reddish brown; legs entirely pale yellow | F. takahashii |
1 | Scutellum distinctly projecting, the tip extended posteriorly (Fig. |
S. praefectus |
– | Scutellum somewhat weakly projecting, the tip not extended posteriorly | 2 |
2 | Antennal segment II yellowish brown with apical 1/3 darkened; a pair of yellowish-brown markings laterally on scutellum; mesepimeron mostly whitish yellow | S. japonicus |
– | Antennal segment II entirely or basal and apical 1/3 dark; scutellum and mesepimeron entirely dark | S. takaii |
Holotype: ♀, Japan: Shikoku, Kochi, Monobe, Nishikuma-keikoku, 5.VIII.2000, M. Takai (AMNH_PBI 00380591) (NIAES). Paratype: 1♀, Nagasaki, Tsushima Island, Mt. Tatera, 34°09'00"N, 129°13'30"E, 25 Sep 1993, T. Yasunaga (AMNH_PBI 00380592) (TYCN)
Dorsum dark brown with a pair of pale markings on hemelytra; head slightly pale; pronotum trapeziform, strongly convex; femora and bases of tibiae infuscate. In general appearance, this new species resembles F. collaris Miyamoto, from which it can be distinguished by its hemelytral coloration.
Female: Body dark chestnut brown with a pair of paler markings on hemelytra, highly polished and punctate. Head slightly paler than remainder of body, suddenly restricted anterior to compound eye; tip of tylus infuscate; jugum, lorum, and gena paler than frons; vertex somewhat depressed; postocular part elongate, neck-like; buccula tinged with red. Antennal segment I dark chestnut brown, apparently thicker than other segments; segments II–IV pale yellowish brown. Labium castaneous; apical 1/3 of segment III pale brown. Pronotum entirely dark chestnut brown, highly polished and punctate, trapeziform and strongly convex; posterior margin rounded; collar flattened and weakly punctate; prosternum somewhat pale, conically projecting; ostiolar peritreme whitish yellow. Hemelytra widely dark chestnut brown except marking on basal 1/3 of corium brown. Membrane infuscate adjacent to red-tinged vein. Femora dark reddish brown; tibiae pale yellow except base infuscate; tarsi pale yellow. Abdomen dark chestnut brown.
(♀). Total body length: 3.64–4.17; width head across eyes: 0.50–0.59; width vertex: 0.15; length labium: 1.23–1.38; length of antennal segments I–IV: 0.41–0.43, 1.07–1.11, 0.83–0.86, 0.49–0.50; length pronotum including collar: 1.10–1.18; width base of pronotum: 1.41–1.48; maximum width across hemelytra: 1.65–1.70; length of hind femur, tibia, and tarsus: 1.20–1.48, 1.47–1.55, 0.30–0.32.
Named in honor of Dr. Thomas J. (Tom) Henry, our honorable friend and mentor.
Japan (Shikoku: Kochi Pref., Tsushima Island).
The habits of this new species remain unknown; the only information is that the type specimens were collected by using a UV light trap or sweeping broadleaf trees.
This new species can be distinguished from its congeners by the coloration described above. Based on the generally ovoid body and rather weakly porrect head, our new species is assumed to be most closely related to F. collaris. As in certain other congeners, the population density of F. henrytomi is extremely low, as only two females have been collected, in spite of our continuing efforts and those of our enthusiastic colleagues to find additional specimens.
Habitus images of Fingulus spp. and Stethoconus spp. from Japan. 1 F. collaris from Ishigaki Island. Ryukyus 2 F. longicornis from Amami Island, Ryukyus 3 F. takahashii from Ishigaki Island 4 F. henrytomi sp. n. from Kochi, Shikoku, holotype, female 5 S. japonicus preying on Stephanitis pyrioides (Scott) (Tingidae), from Ibaraki, Honshu 6 S. praefectus form Ishigaki Island 7 S. takaii from Kochi, Holotype, Male.
Stethoconus
japonicus
:
Holotype: ♂. Japan: Shikoku, Kochi., Agawa, Ino, 33.56N, 133.39E, 2 Aug 1998, M. Takai (AMNH_PBI 00380593) (NIAES). Paratypes: [Honshu] 1♀, Shizuoka, Atami alt. 300m, 22 Jul 1996, T. Ueda (NIAES); 1♂, Gifu, Gujou, Yamatocho-uchigatani, 28–29 Sep 2004, T. Ueda (NIAES); 1♂, Mie, Mt. Hirakura, 23 Jun 1953, Y. Miwa (NIAES); 2♂, Osaka, Minoo, 21 Jul 1995, K. Temma (NIAES); 1♂, Hyogo, Inagawa, Tsukunami, at light, 12 Jun 1997, Y. Nakatani (NIAES); 1♂, Nara, Kawakami, Shionoha, at light, 15 Jun 1993, Y. Nakatani (NIAES); 6♂1♀, Nara, Kawakami, Kitamata, at light, 15 Jun 1993, Y. Nakatani (
Coloration generally dark; antennal segment II, or at least basal and apical 1/3, darkened; areas between pronotal punctures rather smooth; scutellum weakly elevated and blackish; mesepimeron blackish; abdomen mostly blackish.
Body generally maculate; dorsum shiny, densely clothed with long erect yellowish setae. Head shiny yellowish brown; brown stripe on vertex. Antenna dark brown; basal 1/3 or half of segment I somewhat pale, sometimes tinged with red; middle portion of segment II sometimes pale; base of segment III pale. Labium yellowish brown except tip brown, reaching anterior margin of mesosternum. Pronotum dark brown with yellowish quotation mark-shaped markings, strongly convex and distinctly punctate, densely covered with long erect yellowish setae; collar yellowish brown with dark base punctate, length 0.56 of width; triangular yellowish marking on mesal calli; short longitudinal whitish stripe on base of disc; posterior margin narrowly pale; areas between punctures on disc somewhat swollen but not calloused; prosternum yellowish brown, conically projecting. Scutellum entirely dark, gradually elevated to posterior with rounded carinate process; meso- and metapleura dark except for ostiolar peritreme whitish yellow. Hemelytron smooth, shiny and transparent with two transverse brown bands; anterior 1/4 and posterior half dark brown; mesal half of posterior end of corium brown, both sides of marking connected with posterior transverse band; posterior part of embolium narrowly brown; posterior part of cuneus and membrane veins tinged with brown. Legs pale yellowish brown; hind femur with apical 1/3 brown or with red band. Abdomen almost entirely dark brown in male, lateral half of segments II, IV and VII yellowish brown in female; marking on female segment II convex. Male genitalia as in Figs
(♂/♀). Total body length: 3.70–4.45/4.19–4.62; width head across eyes: 0.74–0.80/0.75–0.85; width vertex: 0.28–0.30/0.33–0.37; length of labium; 0.92–0.97/0.98–1.10; length of antennal segments I–IV: 0.33–0.38/0.44–0.50, 1.40–1.58/1.44–1.65, 0.38–0.43/0.44–0.60, 0.33–0.41/0.33–0.36; length of pronotum including collar: 1.00–1.08/1.0–1.26; width base of pronotum: 1.45–1.60/1.66–1.81; maximum width across hemelytra: 1.80–20.4/2.04–2.21; length of hind femur, tibia, and tarsus: 1.28–1.45/1.52–1.68, 1.69–2.01/1.61–2.18, 0.27–0.30/0.29–0.36.
Japan (Shikoku: Kochi Pref., Tsushima Island).
Named after Mr. Mikio Takai, who first suggested the presence of this new species.
According to Mr. M. Takai (pers. obs.), Stethoconus takaii was associated with a colony of Stephanitis yasumatsui Takeya, 1951 (Tingidae) on an evergreen broadleaf tree, Trochodendron aralioides Siebold et Zucc. (Trochodendraceae). This tingid species is assumed to be a prey item for the mirid.
The male genital structure of this new species is similar to that of S. japonicus except for the shape of the left paramere. Stethoconus takaii can be distinguished from the latter by the following characters. Antennal segment II dark, if middle pale, at least basal 1/3 infuscate (Figs
Special thanks are due to the late Mr. S. Gotoh (Tanabe, Wakayama, Japan) and Mr. M. Takai (Kochi, Japan), who had supported this study by providing valuable specimens. We are also much indebted to the following individuals for offering or loaning material: Dr. T. Hirowatari (Kyushu University, Fukuoka, Japan), Y. Sawada, K. Temma, and T. Ueda (Osaka, Japan). We are indebted to Nagasaki West High School, Japan (SSH: Super-Science High School program, biology section, Mr. T. Nagashima) and to Mr. D. Terada (CSR Division, Hitachi High-Technologies Corporation, Tokyo) for generously allowing TY to use a scanning electron microscope. We are grateful to Dr AG Wheeler (Clemson Univ., SC, USA) for inviting us to be part of this commemorative volume for Dr Thomas J Henry (Washington, DC, USA).