Chrysochus

Chrysochus
Chrysochus cobaltinus
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Coleoptera
Suborder:	Polyphaga
Infraorder:	Cucujiformia
Family:	Chrysomelidae
Subfamily:	Eumolpinae
Tribe:	Eumolpini
Genus:	Chrysochus Chevrolat in Dejean, 1836
Type species
Chrysomela praetiosa (= Chrysomela asclepiadea Pallas, 1773) Fabricius, 1792
Synonyms[1]
Atymius Gistel, 1848 Eumolpus sensu auct.

Chrysochus is a genus of leaf beetles in the subfamily Eumolpinae. It is known from North America, Europe and Asia.

Etymology

The name of the genus is derived from the Greek word χρυσοχόος (chrysochóos), meaning "goldsmith".[2]

Taxonomic history

In 1836, the genus Chrysochus was first established by Louis Alexandre Auguste Chevrolat in Dejean's Catalogue des Coléoptères, including the species Chrysomela asiatica Pallas, 1771, C. aurata Fabricius, 1775 and C. pretiosa Fabricius, 1792 (now Chrysochares asiaticus, Chrysochus auratus and Chrysochus asclepiadeus, respectively). Chrysomela praetiosa was designated as the type species of the genus by Sylvain Auguste de Marseul in 1864.[3]

The generic name Chrysochus Chevrolat in Dejean, 1836 is a conserved name. It was threatened by Eumolpus in the sense used by Kugelann in Illiger, 1798, which included Chrysomela praetiosa. An application to conserve Chrysochus and other names by suppressing Eumolpus Illiger, 1798 was accepted by the International Commission on Zoological Nomenclature in 2012.[4][5]

Species

There are at least eight described species in Chrysochus. Six are found in the Palearctic realm,[6] and only two are found in North America.

List of Chrysochus species

Scientific name	Authority	Range	Common name	Image
Chrysochus asclepiadeus	(Pallas, 1773)	Widespread across Europe, also found in Kazakhstan and Turkey
Chrysochus auratus	(Fabricius, 1775)	Eastern North America	Dogbane beetle
Chrysochus brevefasciatus	Pic, 1934[7]	Shanghai, China
Chrysochus chinensis	Baly, 1859[8]	Central, North and Northeast China, Japan, Mongolia and the Russian Far East
Chrysochus cobaltinus	LeConte, 1857	Western United States and British Columbia	Blue milkweed beetle
Chrysochus globicollis	Lefèvre, 1888	Northeast China, the Russian Far East and North Korea
Chrysochus goniostoma	Weise, 1889	North and Northeast China, Mongolia, and the Russian Far East
Chrysochus sikhima	Jacoby, 1908[9]	Sikkim, India

Another species, Chrysochus mniszechi, was described in 1877 by Édouard Lefèvre, from three specimens he had seen (one in the collection of Georges Mniszech [fr], and two from Henry Deyrolle's). While he did not know where the specimens were collected from, Lefèvre thought that they probably came from North America.[10]

The following species, all from the Oriental realm, were formerly included in Chrysochus. They were transferred to the genera Parheminodes and Platycorynus in 2021:[11]

• Chrysochus conspectus Lefèvre, 1890: moved to Parheminodes
• Chrysochus hageni Jacoby, 1884:[12] moved to Parheminodes
• Chrysochus languei Lefèvre, 1893: moved to Platycorynus
• Chrysochus massiei Lefèvre, 1893: moved to Parheminodes
• Chrysochus mouhoti Baly, 1864: moved to Parheminodes
• Chrysochus nilgiriensis Jacoby, 1908:[9] moved to Parheminodes
• Chrysochus pulcher Baly, 1864:[13] moved to Parheminodes

Biology

All species of Chryochus feed on plants in the Apocynaceae (dogbane) and Asclepiadaceae (milkweed) families. A small mutation has allowed the two North American species, C. auratus and C. cobaltinus, in particular to feed on the plant species containing cardenolides, while all other species of the genus feed on plant species without cardenolides.[14]

References

1. Bezděk, J. (2020). "Review of the genus-level names proposed by Johannes Gistel in Chrysomelidae (Coleoptera)". Acta Entomologica Musei Nationalis Pragae. 60 (1): 173–188. doi:10.37520/aemnp.2020.011.
2. Chevrolat, L.A.A. (1843). "Chrysochus". In d'Orbigny, C. (ed.). Dictionnaire Universel d'Histoire Naturelle. Vol. 3. Paris: MM. Renard, Martinet et Cie. p. 652.
3. Bousquet, Yves; Bouchard, Patrice (2013). "The genera in the second catalogue (1833–1836) of Dejean's Coleoptera collection". ZooKeys (282): 1–219. doi:10.3897/zookeys.282.4401. PMC 3677338. PMID 23794836.
4. Moseyko, A.G.; Sprecher-Uebersax, E.; Löbl, I. (2010). "Case 3519 Eumolpus Weber, 1801, Chrysochus Chevrolat in Dejean, 1836 and Bromius Chevrolat in Dejean, 1836 (Insecta, Coleoptera, chrysomelidae): proposed conservation of usage". The Bulletin of Zoological Nomenclature. 67 (3): 218–224. doi:10.21805/bzn.v67i3.a10. S2CID 83763033.
5. ICZN (2012). "Opinion 2298 (Case 3519) Eumolpus Weber, 1801, Chrysochus Chevrolat in Dejean, 1836 and Bromius Chevrolat in Dejean, 1836 (Insecta, Coleoptera, chrysomelidae): usage conserved". The Bulletin of Zoological Nomenclature. 69 (2): 147–149. doi:10.21805/bzn.v69i2.a6. S2CID 83692416. The Commission has conserved the usage of the generic names Eumolpus Weber, 1801, Chrysochus Chevrolat in Dejean, 1836 and Bromius Chevrolat in Dejean, 1836 by suppressing the name Eumolpus Illiger, 1798.
6. Moseyko, A. G.; Sprecher-Uebersax, E. (2010). "Eumolpinae". In Löbl, I.; Smetana, A. (eds.). Catalogue of Palaearctic Coleoptera. Volume 6. Chrysomeloidea. Stenstrup, Denmark: Apollo Books. pp. 619–643. ISBN 978-87-88757-84-2.
7. Pic, M. (1934). "Nouveautés diverses" (PDF). Mélanges Exotico–Entomologiques. 63: 1–36.
8. Baly, J. S. (1859). "Descriptions of new genera and species of Phytophagous insects". Annals and Magazine of Natural History. 3. 4 (20): 124–128. doi:10.1080/00222935908697096.
9. Jacoby, M. (1908). Bingham, C. T. (ed.). Coleoptera. Chrysomelidae. Vol. 1. The Fauna of British India, Including Ceylon and Burma. London: Taylor & Francis.
10. Lefèvre, E. (1877). "Descriptions de Coléoptères nouveaux ou peu connus de la Famille des Eumolpides (2e partie)". Annales de la Société Entomologique de France. 5. 7: 309–326.
11. Moseyko, A.G. (2020). "Notes on Asiatic Eumolpinae (Coleoptera, Chrysomelidae)". Entomological Review. 100 (6) (published 15 January 2021): 843–862. doi:10.1134/S0013873820060123. S2CID 234621478.
12. Jacoby, M. (1884). "Descriptions of new genera and species of phytophagous Coleoptera collected by Dr. B. Hagen at Serdang (East Sumatra)". Notes from the Leyden Museum. 6: 201–230.
13. Baly, J. S. (1864). Descriptions of new genera and species of Phytophaga. Stationer's Hall: J.S. Baly.
14. Jolivet, Pierre; Verma, Krishna K. (2008). "Eumolpinae – a widely distributed and much diversified subfamily of leaf beetles (Coleoptera, Chrysomelidae)" (PDF). Terrestrial Arthropod Reviews. 1 (1): 3–37. doi:10.1163/187498308X345424.

Further reading

• Dolgovskaya, M.Y.; Volkovitsh, M.G.; Reznik, S.Y.; et al. (2016). "Host specificity of Asian Chrysochus Chevr. in Dej. (Coleoptera, Chrysomelidae: Eumolpinae) and their potential use for biological control of invasive Vincetoxicum species". Entomological Review. 96 (7): 826–830. doi:10.1134/S0013873816070022. S2CID 41525270.