Jewel scarab

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The ruteline genus Chrysina, or jewel scarabs (not to be confused with jewel beetles, which are a different family), is a large genus of brightly colored, often metallic iridescent species, ranging from the southwestern edge of the United States as far south as Venezuela and Ecuador. The genus includes all the species formerly known as Plusiotis.[1] They are typically between 15–35 millimetres (0.59–1.38 in) in length, and are nocturnal in habits, coming readily to lights. The larvae live in rotting logs, while the adults commonly feed on foliage; they tend to be found in pine, juniper, or pine-oak forests, most commonly between 1,000–3,000 metres (3,300–9,800 ft) elevation. They are most diverse in countries such as Guatemala, where as many as 15 species can be found in a single location, but there are only 4 species which occur in the United States.[1]

Jewel scarabs
Chrysinasp..JPG
Chrysina limbata
Scientific classification e
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Coleoptera
Family: Scarabaeidae
Tribe: Rutelini
Genus: Chrysina
Kirby, 1828
Species

see text

Synonyms
  • Plusiotis Burmeister, 1844
  • Pelidnotopsis Ohaus, 1915
  • Plusiotina Casey, 1915

These beetles are very popular among collectors; many species are polymorphic, with rare color variants that can command high prices. One such specimen was featured on the cover of National Geographic Magazine.[2] The majority of species are bright green, but metallic silver and gold are also common colors, and may be combined with green as in the common Chrysina gloriosa from the Madrean sky islands region.

Particularly attractive specimens were reported to sell for as much as $500 in 2007.[2]

The genus name is from Greek χρύσινος (chrysinos), "gold-coloured".

SpeciesEdit

Metallic color mechanismEdit

Research has shown that the elytra of Chrysina are composed of about 70 chitinous layers of exoskeleton. The different reflective indices and spacing of the layers cause light of different wavelengths to be selectively refracted through them and by them in different phases, leading to a metallic appearance, and also leads to different specimens having different colors.[3]

ReferencesEdit

  1. ^ a b Hawks, D.C. 2001. Taxonomic and nomenclatural changes in Chrysina and a synonymic checklist of species (Scarabaeidae: Rutelinae). Occ. Papers Consort. Coleopt. 4: 1-8
  2. ^ a b "Jewel Scarabs". National Geographic. 2007-02-07. Archived from the original on 2007-02-07. Retrieved 2018-08-19.
  3. ^ "Chitin Layers Produce Gold and Silver Colors". Ask Nature. September 14, 2016. Retrieved July 27, 2022.

External linksEdit