Biodiversity Data Journal :
Taxonomy & Inventories
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Corresponding author: Kyosuke Okuda (kyskokuda@gmail.com)
Academic editor: Jader Oliveira
Received: 04 Mar 2023 | Accepted: 05 Apr 2023 | Published: 11 Apr 2023
© 2023 Kyosuke Okuda, Zhuo Chen
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:
Okuda K, Chen Z (2023) A new synonym of a species of Stachyotropha Stål, 1871, a genus of Asian Stenopodainae (Hemiptera, Heteroptera, Reduviidae). Biodiversity Data Journal 11: e102977. https://doi.org/10.3897/BDJ.11.e102977
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Stachyotropha Stål, 1871 (Reduviidae, Stenopodainae) currently includes only two species: S. punctifera Stål, 1871 and S. miyamotoi Hidaka & Miller, 1959 only recorded from East Asia.
This study reviews the genus Stachyotropha Stål, 1871 and its two described species. Based on the examination of the type specimens and the original descriptions, S. miyamotoi Hidaka & Miller, 1959 is regarded as a junior synonym of S. punctifera. Further, we briefly discuss the distribution and biology of S. punctifera.
China, East Asia, Japan, new synonym, Philippines, taxonomy
Stenopodainae Amyot & Serville, 1843 is the fifth largest subfamily of Reduviidae, with approximately 115 described genera and 720 described species. Most of these species occur in the Tropics (
One such group is Stachyotropha Stål, 1871, which is a genus with only two species, S. punctifera Stål, 1871 and S. miyamotoi Hidaka & Miller, 1959, that have only been described from East Asia so far (
Minimal records of species from this genus could have led to an incorrect comparison between the two species in the past. Thus, in this study, we reviewed the genus Stachyotropha and its two described species to determine whether S. punctifera and S. miyamotoi are, indeed, separate species or synonyms of the same species. We also attempted to obtain new biological and distributional information for the genus.
Examined type specimens. We examined photos of the types provided by the Swedish Museum of Natural History, Stockholm, Sweden (NHRS). These photos were provided by Gunvi Lindberg and are copyright (2022) of the NHRS. Two male specimens with "Type" and "Paratype" labels were found; however,
The holotype of S. miyamotoi had been deposited in the Entomological Laboratory, Faculty of Agriculture, Kyushu University, Fukuoka, Japan (ELKU). At the time of the present study, ELKU loaned the holotype to the Entomological Museum of China Agricultural University, Beijing, China (CAU) where we could study it.
Additional specimens. Non-type specimens were obtained from the following institutions: Kanagawa Prefectural Museum of Natural History, Kanagawa, Japan (KPMNH); Laboratory of Entomology, Faculty of Agriculture, Tokyo University of Agriculture, Kanagawa, Japan (ELTUA); Entomological Museum of China Agricultural University, Beijing, China (CAU); and the private collection of Kyosuke Okuda, Saitama, Japan (PCKO).
Specimens collected during recent field surveys by the first author and our colleagues were also studied. Morphological characteristics were observed and measured under a stereomicroscope (Olympus SZ40; Olympus, Tokyo, Japan) equipped with a micrometer. To examine the structure of male genitalia, the male terminalia were soaked in hot 5% potassium hydroxide (KOH) solution for approximately 10 min to remove the tissues. Photographs of the specimens were taken using a single-lens reflex camera (Canon 7D Mark II; Canon, Tokyo, Japan), equipped with a Canon macro lens EF 100 mm and MP-E 65 mm. All morphological terms were assigned in accordance with
Stachyotropha
Macropterous male. Colouration: Basic colouration pale brown with dark marking on pronotum, hemelytra and abdomen.
Vestiture: Head, thorax, abdomen, legs and antennae densely covered with short setae. Compound eyes with sparse short setae. Femur with short decumbent setae; tibia and tarsus with suberect setae.
Structure: Body elongated. Head cylindical, integument granulose; ante-ocular portion longer than postocular portion; lateral side of postocular portion lacking tubercles. Compound eyes spherical, well projected laterad. Ocelli not elevated. Juga (= mandibular plates) strongly produced anteriorly, slightly upwards, slightly shorter than scape (= antennal segment I). Maxillary plates produced anteriorly, straight, approximately half of length of scape. Scape stout, shorter than head; pedicel (= antennal segment II) slender, longer than scape; flagellomeres (= antennal segment III and IV) filiform, shorter than scape. Labium curved; first visible labial segment extend beyond posterior margin of eye, approximately 2 times as long as remaining segments combined.
Pronotum trapezoidal, integument granulose, longer than humeral width and head length; anterior pronotal lobe with four vague glabrous sulci on disc; anterolateral angles obtuse; posterior angles obtuse with posterior margin projecting backwards and slightly concave at mid-portion.
Profemur thickened, with erect setae; lateral inner side armed with three long spines and one or two pairs of short spines, outer side armed with three long spines and one or two pairs of short spines; spines produced slightly downwards and occurring alternately on inner and outer sides. Protibia with two pairs of lateral spines produced slightly downwards and occurring alternately; protarsus three-segmented. Mid-femur and hind femur slender, lacking spines; mid-tarsus and hind tarsus three-segmented; third tarsomere longer than remaining segments.
Abdomen elongate, with lateral margins almost parallel; tergite VII with obliquely angulately truncated inner side, posteromedial margin deeply concave.
Macropterous female. Similar to male in general habitus. Abdominal segments II ~ VI with lateral margins almost parallel; segment VII strongly extended backwards, with obliquely angulately truncated inner side, posteromedial margin deeply concave; segment VIII large, transverse; basal half of sternite covered by gonocoxa VIII.
In general appearance, this genus resembles Campsocnemis Stål, 1871 known from East Asia, but it can be distinguished from the latter by a combination of the following characters: juga as long as or slightly shorter than scape (in Campsocnemis, juga obviously shorter than scape); profemur and protibia armed ventrally with two rows of long diverging spines (in Campsocnemis, profemur armed with two rows of finely diverging spines, protibia lacking spines).
The genus Stachyotropha previously contained two species distributed in East Asia (
Stachyotropha punctifera Stål,1871 -
Stachyotropha miyamotoi Hidaka and Miller, 1959 -
Macropterous male. Colouration: General colour pale yellowish-brown (Fig.
Vestiture: Head, thorax, abdomen, legs and antennae densely covered with short setae. Scape with short decumbent setae, approximately less than 0.4 times as long as maximum width of scape; segment II ~ IV with long suberect setae, approximately 1.0 ~ 1.3 times as long as maximum width of each antennal segment. Femur with short setae, approximately less than 0.2 times as long as maximum width of femur; tibia with decumbent setae, approximately 0.5 times as long as maximum width of tibia; tarsus with decumbent setae, approximately as long as maximum width of tarsus.
Structure: male: Body medium-sized (16.00 mm), approximately 6.9 times longer than its maximum width (Fig.
Stachyotropha punctifera: A, B head, male (A: dorsal; B: lateral); C proleg; D protibia, ventral; E profemur, ventral; F, G abdominal sternite VII, ventral (F: male; G: female); H, I pygophore (H: dorsal; I: lateral); J median process of pygophore, caudal; K paramere, in different views; L–N phallus (L: lateral; M: dorsal; N: expanded phallosoma dorsal view). Arrows in D, E indicate front direction. Scale bars: 1 mm for A–G, 0.5 mm for H–I and K–N and 0.25 mm for J. (Abbreviations: bp, basal plates; pd, pedicel; plb, phallobase; plt, phallotheca).
Pronotum 1.5 times as long as humeral width; anterior propleural spines thick, acute, curved upwards, shorter than eye width. Hemelytra reaching abdominal segment VII.
Profemur (Fig.
Abdomen (Fig.
Male genitalia. Pygophore (Fig.
Macropterous female. Similar to male in general habitus (Fig.
China: Fujian, Guangxi; Japan: The Ryukyus (Kakeroma Island, Okinawa Island, Miyako Island, Ishigaki Island, Iriomote Island, Yonaguni Island); Philippines: Mindanao Island.
In Japan, almost all examined specimens were collected using light traps. This species was very rare everywhere.
Based on the examination of the syntypes of S. punctifera (Figs
Stachyotropha punctifera male, syntype deposited in NHRS, catalogue number NHRS-GU-LI000001771. A dorsal; B lateral; C ventral; D labels; Scale bar: 10 mm (A). Photos by Gunvi Lindberg, 2022; Naturhistoriska riksmuseet. Made available by the Swedish Museum of Natural History under Creative Commons Attribution 4.0 International Public License, CC-BY 4.0., https://creativecommons.org/licenses/by/4.0/.
Stachyotropha punctifera, male, syntype deposited in NHRS, catalogue number NHRS-GU-LI000007698. A dorsal; B lateral; C ventral; D labels; Scale bar: 10 mm (A). Photos by Gunvi Lindberg, 2022, Naturhistoriska riksmuseet. Made available by the Swedish Museum of Natural History under Creative Commons Attribution 4.0 International Public License, CC-BY 4.0., https://creativecommons.org/licenses/by/4.0/.
The authors wish to thank Gunvi Lindberg and Hege Vårdal (NHRS) for taking photographs of the type specimens used in this study; Kyohei Watanabe (KPMNH) for providing opportunities to examine the additional materials used in this study and introducing us to curators of NHRS, thereby enabling us to obtain photographs of type materials; Tadashi Ishikawa (ELTUA) for his kindness and providing strategic advice, as well as contributing useful photographs for this study; and Reo Ito (Oita, Japan), Takumi Matsuda and Tomoya Saeki (ELTUA) for providing the materials used in this study. We also thank Toshiharu Mita and Jun Souma (ELKU) for providing opportunities to examine the type specimen used in this study. We are most grateful to Jader de Oliveira (University of São Paulo, São Paulo, Brazil), Hélcio R. Gil-Santana (Instituto Oswaldo Cruz, Rio de Janeiro, RJ, Brazil) and Pierre Moulet (Museum Requien, Avignon, France) for their critical comments and suggestions regarding this manuscript. We wish to thank Editage (www.editage.com) for English language editing.