Two new species of the nominotypical subgenus Gonioctena Chevrolat, 1836, from China and Laos, and a proposed new species-group (Coleoptera: Chrysomelidae: Chrysomelinae).

The Gonioctena kanfani species-group of the nominotypical subgenus Gonioctena Chevrolat, 1836 is proposed and reviewed. This group comprises the following five species, including two new to science, distributed in eastern China and northern Laos: G. kanfani (Chen, 1941), G. kamikawai (Chj, 1958), G. fujiana Cho Borowiec, 2016, G. jolantae new species, and G. lukasi new species. Members of this species-group are easily distinguished from other species by their metallic lustre, two yellowish-brown markings on the elytral humeri, and the trifurcated tip of the flagellum of the aedeagus. Photographs of habitus, illustrations of male genitalia, and diagnostic characters for each species are given. A distribution map and literature records are also provided.

Characterization of the complete mitochondrial genome of Aphyocypris chinensis (Cypriniformes, Xenocyprididae), and its phylogenetic position in Cypriniformes.

Aphyocypris chinensis Günther, 1868 is a small freshwater fish of the family Xenocyprididae (Cypriniformes). In this study, we determined its complete mitochondrial genome and phylogenetic position in Cypriniformes. The complete mitochondrial genome is 16,608 bp in size, containing 13 protein-coding genes, two RNAs, 22 tRNAs, and a control region. It has the typical vertebrate mitochondrial gene arrangement. Our mitogenomic phylogeny revealed that A. chinensis belongs to Xenocyprididae, rather than Danionidae. This mitogenome information could play an essential role in resolving the conflict over its current taxonomic status in Cypriniformes.

Definition of the Gonioctena subgeminata species group (Coleoptera, Chrysomelidae, Chrysomelinae), with descriptions of two new species from China and Vietnam.

This paper defines and reviews the Gonioctena subgeminata species group of the subgenus Asiphytodecta Chen, 1935. The group contains the following five species, including two new to science: G. subgeminata (Chen, 1934), G. tonkinensis (Chen, 1934), G. oudai Cho & Borowiec, 2016, G. allardi sp. nov., and G. mantillerii sp. nov. The species group restricted to China and Vietnam is characterized by a labrum without a tooth-like projection, elytral punctures arranged in discernible rows, and a setose aedeagus with a broad apical process. Gonioctena tonkinensis is newly reported as an ovoviviparous species. Habitus photographs, illustrations of diagnostic characters of each species, and a key to the species are provided.

An integrative approach reveals a new species of flightless leaf beetle (Chrysomelidae: Suinzona) from South Korea.

The leaf beetle genus Suinzona, consisting of over 20 species, is mainly known for species from Southwest China, and its closely related genus Potaninia, with only two species, is widely distributed in South China and upper Southeast Asia. Despite recent morphological studies, the status of these taxa has long been controversial. Here, we investigated the taxonomic status and phylogenetic relationships of the genera Suinzona and Potaninia within Chrysomelinae using molecular, morphological and ecological data. Molecular phylogenetic analysis supported that they should be regarded as distinct genera, which is consistent with morphological evidence, e.g., well-developed/reduced hind wings. Based on combined evidence from examination of larval and adult morphology, host plants and mitochondrial genomes, we demonstrate that P. cyrtonoides should be placed in the genus Suinzona and that specimens from South Korea represent a new species. Suinzona borowieci sp. nov., occurring in narrow strips of habitat, shows high levels of genetic divergence and distantly related host plants between populations. The population differentiation seems to be correlated with its non-functional wings causing reduced dispersal ability and genetic isolation. Several populations have declined dramatically over the last few decades due to loss of habitat and thus are in need of protection as conservation units.

Redescription of mature larva and biological notes on the nominotypical subgenus Gonioctena Chevrolat (Coleoptera: Chrysomelidae: Chrysomelinae) from South Korea.

The mature larvae of the nominotypical subgenus Gonioctena Chevrolat, 1836 are redescribed and illustrated: G. coreana (Bechyne, 1948), G. gracilicornis (Kraatz, 1879), G. jacobsoni (Ogloblin Medvedev, 1956), and G. viminalis (Linnaeus, 1758). The tubercular pattern, chaetotaxy, and shape of tarsugulus were used as diagnostic characters for the species determination of Gonioctena s. str. larvae. The literature on larval morphology of each species has been summarized. Furthermore, the biology, behavior, and host plant are presented. Ovoviviparity is newly reported in G. coreana.

Two new species of the subgenus Brachyphytodecta Bechyne, 1948 (Coleoptera, Chrysomelidae, Gonioctena) from Sichuan, Southwest China.

Two new species, Gonioctena (Brachyphytodecta) davidi sp. nov. and G. (B.) kangdingensis sp. nov., are described from Sichuan, China. Both are easily distinguished from other species by the presence of many micro-denticles on apicolateral surface of aedeagus, which is a unique character in the genus Gonioctena Chevrolat, 1836. A distribution map, photographs and diagnostic characters with illustrations of each species are included.

Larval morphology of Phratora koreana Takizawa, 1985 with a key to the larvae of the Palaearctic Phratora species (Coleoptera, Chrysomelidae, Chrysomelinae).

The first and third instar larvae of Phratora koreana Takizawa, 1985 are described and illustrated in detail for the first time. Morphological changes in the pigmentation, tubercular pattern and defensive glands during the larval development are discussed. The life cycle and host-plant of Phratora koreana and a key to the larvae of the Palaearctic Phratora species are also provided.

Larval morphology of Plagiosterna adamsii (Baly) and P. aenea (Linnaeus) with resurrection of Gastrolinoides Chûjô & Kimoto and P. formosana (Bates) (Coleoptera: Chrysomelidae: Chrysomelinae).

Larvae of Plagiosterna adamsii (Baly, 1864) and P. aenea (Linnaeus, 1758) are redescribed and illustrated in detail, with discussion of the previous misinterpretations. The first instar larva of Plagiosterna adamsii is described for the first time. The original name and citation of P. adamsii is confirmed. The genus Gastrolinoides Chûjô & Kimoto, 1960 is resurrected from synonymy with Plagiosterna Motschulsky, 1860. Plagiosterna formosana (Bates, 1866) is resurrected from synonymy with P. aenea. A key to the larvae of the Palaearctic Plagiosterna is provided. Tubercular pattern, pigmentation and sclerotized platelets of the integument are used as diagnostic characters for particular species.

Revision of the Gonioctena nivosa species-group (Coleoptera, Chrysomelidae, Chrysomelinae) in the Holarctic region, with descriptions of two new species.

The Gonioctena nivosa species-group of the genus Gonioctena Chevrolat, 1836 is defined and reviewed. It contains six species including two new to science: Gonioctena gracilicornis (Kraatz, 1879), Gonioctena nivosa (Suffrian, 1851), Gonioctena norvegica (Strand, 1936), Gonioctena springlovae (Bechyne, 1948), Gonioctena amurensis Cho & Borowiec, sp. n. and Gonioctena jani Cho & Borowiec, sp. n. Six new synonyms are proposed: Gonioctena nivosa (= Gonioctena arctica alberta Brown, 1952, syn. n., Phytodecta linnaeana bergrothi Jacobson, 1901, syn. n., Phytodecta linnaeanus var. mutatus Achard, 1924, syn. n., Phytodecta linnaeanus var. simplex Achard, 1924, syn. n. and Phytodecta nivosa var. cedehensis Ronchetti, 1922, syn. n.) and Gonioctena norvegica (= Gonioctena janovskii Medvedev, 1976, syn. n.). Phytodecta flavicornis var. limbatipennis Achard, 1924 and Phytodecta nivosa var. bicolor Heyden, 1883 are removed from synonymy with Gonioctena nivosa (Suffrian, 1851) and are synonymized with Gonioctena flavicornis (Suffrian, 1851). Distribution maps, a key to species, color variation, geographic variation of male genitalia and host plants are provided. Ovoviviparity is newly recorded in Gonioctena gracilicornis and Gonioctena nivosa. Lectotypes are designated for Gonioctena affinis, Gonioctena arctica, Gonioctena linnaeana bergrothi and Gonioctena nivosa.

On the genus Gonioctena Chevrolat (Coleoptera: Chrysomelidae: Chrysomelinae), with descriptions of seven new species from the Oriental region and Palaearctic China.

Seven new species of Gonioctena Chevrolat are described from the Oriental region and Palaearctic China: Gonioctena (Asiphytodecta) mausonensis sp. nov., G. (A.) oudai sp. nov., G. (Brachyphytodecta) arunensis sp. nov., G. (B.) mauroi sp. nov., G. (B.) medvedevi sp. nov., G. (Gonioctena) fujiana sp. nov. and G. (G.) mongolica sp. nov. Gonioctena (Asiphytodecta) subgeminata tonkinensis (Chen, 1934) is removed from synonymy with G. (A.) subgeminata (Chen, 1934) and raised to the species level. Gonioctena (Gonioctena) suwai Takizawa, 1985 is synonymized with G. (G.) ogloblini Medvedev & Dubeshko, 1972. Gonioctena (Asiphytodecta) sapaensis nom. nov. is proposed as a replacement name for G. (A.) unicolor Medvedev, 1987 not Phytodecta quinquepunctata var. unicolor Weise, 1884. Lectotype is designated for Phytodecta subgeminatus var. tonkinensis Chen, 1934.

Two new species of the genus Gonioctena Chevrolat (Coleoptera, Chrysomelidae, Chrysomelinae) from Sichuan, China.

Two new species of Gonioctena Chevrolat, G. sichuana sp. n. and G. metallica sp. n., are described from Sichuan Province, China. Diagnostic characters and illustrations are provided. Ovoviviparity is recorded in G. metallica sp. n.

A new species of the genus Ambrostoma Motschulsky (Coleoptera, Chrysomelidae, Chrysomelinae) from South Korea, with larval descriptions and biological notes.

Ambrostoma koreana sp. n. is described from South Korea. Detailed descriptions and illustrations of adult and all larval instars are provided and differences to closely related species are discussed. Ovoviviparity is reported for the first time in the genus Ambrostoma. Notes on distribution, host plant and biology are also provided.