Chrysochus

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

Chrysochus
Chrysochus cobaltinus
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Coleoptera
Family: Chrysomelidae
Subfamily: Eumolpinae
Tribe: Eumolpini
Genus: Chrysochus
Chevrolat in Dejean, 1836
Type species
Chrysomela praetiosa
(= Chrysomela asclepiadea Pallas, 1773)
Fabricius, 1792
Synonyms[1]

Nomenclature

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 (now a junior synonym of Chrysochus asclepiadeus). An application to conserve Chrysochus and other names by suppressing Eumolpus Kugelann in Illiger, 1798 (modified to Illiger, 1798) was accepted by ICZN in 2012.[2][3]

Species

There are at least eight described species in Chrysochus. Six are found in the Palearctic realm,[4] and only two are found in North America.

  • Chrysochus asclepiadeus (Pallas, 1773) – widespread across Europe, also found in Kazakhstan and Turkey
    • Chrysochus asclepiadeus asiaeminoris De Monte, 1948 (Considered a synonym by Ekiz et al. (2015)[5])
  • Chrysochus auratus (Fabricius, 1775) – Dogbane beetle; found in eastern North America
  • Chrysochus brevefasciatus Pic, 1934[6] – found in Shanghai, China
  • Chrysochus chinensis Baly, 1859[7] – found in Central, North and Northeast China, Japan, Mongolia and the Russian Far East
  • Chrysochus cobaltinus LeConte, 1857 – Blue milkweed beetle; found in the western United States and British Columbia
  • Chrysochus globicollis Lefèvre, 1888 – found in Northeast China, the Russian Far East and North Korea
  • Chrysochus goniostoma Weise, 1889 – found in North and Northeast China, Mongolia, and the Russian Far East
  • Chrysochus sikhima Jacoby, 1908[8] – found in Sikkim, India

Another species, Chrysochus mniszechi, was described in 1877 by Édouard Lefèvre, from three specimens he had seen (one in the collection of the Count Mniszech, 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.[9]

The following species, all from the Oriental realm, were formerly included in Chrysochus. They were transferred to the genera Parheminodes and Platycorynus in 2021:[10]

  • Chrysochus conspectus Lefèvre, 1890: moved to Parheminodes
  • Chrysochus hageni Jacoby, 1884:[11] 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:[8] moved to Parheminodes
  • Chrysochus pulcher Baly, 1864:[12] 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.[13]

C. auratus and C. cobaltinus have been generally considered allopatric in distribution in North America. However, two narrow regions of sympatry between the two species have been documented in western North America, one of which is located in South-central Washington.[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. 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.
  3. 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.
  4. 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.
  5. Ekiz, A. N.; Şen, İ.; Gök, A.; Turantepe, E. (2015). "Occurrence of Chrysochus asclepiadeus (Pallas, 1773) (Coleoptera: Chrysomelidae) in Turkey: two distinct subspecies or the same taxon with slightly different populations?". Zoology in the Middle East. 61 (2): 148–152. doi:10.1080/09397140.2015.1020608. S2CID 84573346.
  6. Pic, M. (1934). "Nouveautés diverses" (PDF). Mélanges Exotico–Entomologiques. 63: 1–36.
  7. 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.
  8. Jacoby, M. (1908). Bingham, C. T. (ed.). Coleoptera. Chrysomelidae. Vol. 1. The Fauna of British India, Including Ceylon and Burma. London: Taylor & Francis.
  9. 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.
  10. Moseyko, A.G. (2020). "Notes on Asiatic Eumolpinae (Coleoptera, Chrysomelidae)". Entomological Review (published 15 January 2021). 100 (6): 843–862. doi:10.1134/S0013873820060123.
  11. 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.
  12. Baly, J. S. (1864). Descriptions of new genera and species of Phytophaga. Stationer's Hall: J.S. Baly.
  13. 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.
  14. Peterson, M. A.; Dobler, S.; Holland, J.; T., L.; Locke, S. (2001). "Behavioral, Molecular, and Morphological Evidence for a Hybrid Zone Between Chrysochus auratus and C. cobaltinus (Coleoptera: Chrysomelidae)" (PDF). Annals of the Entomological Society of America. 94 (1): 1–10. doi:10.1603/0013-8746(2001)094[0001:BMAMEF]2.0.CO;2.

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.


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