Eutetrapha Bates, 1884

Lin, Mei-Ying, Bi, Wen-Xuan & Yang, Xing-Ke, 2017, A revision of the genus Eutetrapha Bates (Coleoptera: Cerambycidae: Lamiinae: Saperdini), Zootaxa 4238 (2), pp. 151-202 : 153-154

Genus Eutetrapha Bates, 1884

Eutetrapha Bates, 1884: 256 . Type species: Eutetrapha variicornis Bates, 1884 (= Saperda carinata Blessig, 1872 = Saperda sedecimpunctata Motschulsky, 1860 ). Designated by Gressitt, 1951: 555.

Eutetrapha ; Matsushita, 1933: 401, 403; Gressitt, 1951: 555; Breuning, 1952: 131; Samuelson, 1965:126; Breuning, 1966: 676; Rondon & Breuning, 1970: 526; Pu, 1980: 107; Lee, 1987: 197; Zhou et al., 1988: 105; Pu & Jin, 1991: 189; N. Ohbayashi et al., 1992: 634; Nakamura et al., 1992: 102; Kurihara & A. Saito, In: N. Ohbayashi & Niisato, 2007: 653; Löbl & Smetana, 2010: 323; Nakamura et al., 2014: 170.

Saperda (Eutetrapha) : Felt & Joutel, 1904: 6; Pic, 1910: 9, 10.

Saperda (pars): Abdullah & Abdullah, 1966: 87. (synonymized Eutetrapha with Saperda )

Redefinition. Medium sized (length between 10–25 mm), body length more than 3.3 times of humeral width. Head as broad as prothorax; frons subquadrate; eyes deeply concave, of which inferior lobe subequal to or narrower than half of frons. Antennae longer than body, sparsely fringed with short hairs on ventral sides of basal antennomeres; scape slightly expanded, without ridge; the third antennomere longest; fourth longer than scape. Pronotum slightly broader than long, without lateral tubercles. Elytra subparallel sided, with distinct lateral carinae; apices rounded or slightly truncated. Procoxal cavity closed or narrowly open posteriorly; mesocoxal cavity open externally to mesepimeron; metanepisternum more than twice as wide anteriorly as posteriorly; mesotibiae grooved; metafemora reaching fourth to fifth abdominal segment; first metatarsal segment subequal to or slightly longer than following two combined. Female claws simple ( Fig. 143 ); male claws with anterior ones of pro- and mesotarsi appendiculate with small teeth on outer side, others simple ( Figs. 146 a–c).

Male genitalia: Apex of male tergite VIII rounded, truncated or emarginated. Lateral lobes stout (length less than four times of width) to slender, with a finely setose ridge at ventral base; ringed part elbowed in widest portion, converging; basal piece well-developed and bifurcated. median lobe slightly curved, longer or shorter than tegmen, dorsal plate shorter than ventral plate. Median foramen elongated. Endophallus with two bands of supporting armature, four basal plate-like sclerites, a strongly sclerotized part (at apical 1/3 or apical half) and three rod-like sclerites. Ejaculatory duct single. Female genitalia: Setae of sternite VIII dense and long. Spermathecal capsule and gland positioned on apex of spermathecal duct. Spermathecal capsule strongly sclerotized, composed of an apical orb and a short to long stalk, spiculum ventrale slightly shorter to longer than abdomen.

Diagnosis. This genus differs from Paraglenea Bates ( Fig. 144 ) by the distinct male claws ( Figs. 146 a–c), which are quite different from the typical appendiculate claws on inner side ( Fig. 145 ). However, two other species ( E. chlorotica Pu & Jin, 1991 and E. tianmushana Lin & Bi , sp. nov.) also possess atypical claws, with anterior ones appendiculate on outer side while others appendiculate on inner side ( Figs. 147 a, b). For females, usually antennomere III is much longer than scape, while antennomere III is subequal to or slightly longer than scape in Paraglenea .

Generally speaking, this genus differs from Glenea Newman by elytral apex without distinct teeth. However, there are some species with almost round or slight truncated elytral apex and same male claws in Glenea Newman , such as G. subviridescens Breuning, 1963 (which may belong to Pseudochlorisanis Breuning, 1954 , according to Viktora & Lin 2012).

Remarks. Prior to this work, 19 taxa (17 species and 2 subspecies) were recorded in the genus ( Tavakilian & Chevillotte 2016), with all species distributed in China except two subspecies endemic to Japan: E. chrysochloris chrysochloris ( Bates, 1879) and E. sedecimpunctata australis Takakuwa & Hirokawa, 1998 . Four new species are described from China, and two species are transferred out of Eutetrapha . In this work, we recognize 21 taxa in the genus Eutetrapha .

Eutetrapha can be separated into two subgroups, the sedecimpunctata group, which are covered with pubescence and is quite similar to Saperda except due to its distinct elytral lateral carinae; and the chrysochloris group, which are covered with metallic scales and is quite distinct from the sedecimpunctata group according to molecular analyses (Dr. Nonaka Masaru, personal communication). The type species ( E. sedecimpunctata ) is the only species in the genus with procoxal cavity narrowly open posteriorly. The first author will use both morphological and molecular data to study morphological characters and test the monophyly of the genus (in preparation).

Distribution. China, Russia, North Korea, South Korea, Japan, Laos, India (new country record), Myanmar (new country record).

Figures

FIGURES 143 – 147. Claw types. 143. Simple. 144. Appendiculate. 145. Only anterior claw appendiculate. 146. Only anterior claw appendiculate at outer side (left mesotarsus of male Eutetrapha). 147. Anterior claw appendiculate at outer side and posterior claw appendiculate normally (left mesotarsus of male Eutetrapha chlorotica Pu & Jin, 1991 and E. tianmushana Lin & Bi, sp. nov.). a. Frontal view. b. Lateral view. c. Lateral view in another side.