Trictenotomidae

The Trictenotomidae are a small family of beetles in the suborder Polyphaga containing fifteen species in two genera. Most species are found in the Oriental realm where they live in montane forest habitats. The family is considered, based on larval characters as well as sequence-based studies,[1] to be closely related to the Salpingidae.[2]

Trictenotoma grayi

Trictenotomidae
Autocrates vitalisi
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Coleoptera
Suborder: Polyphaga
Infraorder: Cucujiformia
Superfamily: Tenebrionoidea
Family: Trictenotomidae
Blanchard, 1845

Adult Trictenotomidae can be mistaken for Cerambycidae (Prioninae) or Lucanidae but their 5-5-4 tarsal formula makes them distinctive. They have a long 11-segmented antenna. There are no fossil species known as yet, and nearly all the species are found mainly along the Himalayas extending into China, Korea, the Sunda Islands, and the Philippine Archipelago.[3] Trictenotoma grayi is found in the Western Ghats of peninsular India while T. templetonii is found in Sri Lanka. Adult beetles are attracted to lights and specimens are found widely in collections across the world however very little was known of their life-history until the habits of Trictenotoma formosana were studied in captivity in Taiwan in 2019. Based on that species, these are thought to breed in wood, the eggs being laid under bark. The eggs hatch after about 10 days. The larvae are carnivorous and can be cannibalistic. They build tunnels in soft wood in which they stay. They feed on their exuviae and may undergo 8-9 moults over the course of one and a half years before they pupate. The pupae eclose in 40 to 46 days as adults. Adults feed on tree sap.[4]

The scape of the antenna longer than segments 2 and 3 together with the second segment being rounded. The eight antennal segment is simple in Trictenotoma and has lateral projections in Autocrates. The terminal three antennal segments form a club.[5][6]

  • Genus Autocrates J. Thomson, 1860
    • Autocrates aeneus Parry, 1847
    • Autocrates maqueti Drumont, 2006
    • Autocrates obertheuri Vuillet, 1910
    • Autocrates ivanovi Drumont, 2016
    • Autocrates vitalisi Vuillet, 1912
  • Genus Trictenotoma Gray, 1832
    • Trictenotoma childreni Gray, 1832
    • Trictenotoma cindarella Kreische, 1921
    • Trictenotoma davidi Deyrolle, 1875
    • Trictenotoma formosana Kreische, 1920
    • Trictenotoma grayi Smith, 1851
    • Trictenotoma lansbergi Dohrn, 1882
    • Trictenotoma mniszechi Deyrolle, 1875
    • Trictenotoma mouhoti Deyrolle, 1875
    • Trictenotoma templetoni Westwood, 1848
    • Trictenotoma westwoodi Deyrolle, 1875

References
  1. Kergoat, Gael J.; Soldati, Laurent; Clamens, Anne-Laure; Jourdan, Herve; Jabbour-Zahab, Roula; Genson, Gwenaelle; Bouchard, Patrice; Condamine, Fabien L. (2014). "Higher level molecular phylogeny of darkling beetles (Coleoptera: Tenebrionidae): Darkling beetle phylogeny". Systematic Entomology. 39 (3): 486–499. doi:10.1111/syen.12065.
  2. Hu, Fang-Shuo; Pollock, Darren A.; Telnov, Dmitry (2020). "Comparative morphology of immature Trictenotoma formosana Kriesche, 1919 and systematic position of the Trictenotomidae (Coleoptera, Tenebrionoidea)". European Journal of Taxonomy (640). doi:10.5852/ejt.2020.640.
  3. Hu, Fang-Shuo; Pollock, Darren A.; Telnov, Dmitry (2020-05-05). "Comparative morphology of immature Trictenotoma formosana Kriesche, 1919 and systematic position of the Trictenotomidae (Coleoptera, Tenebrionoidea)". European Journal of Taxonomy (640). doi:10.5852/ejt.2020.640. ISSN 2118-9773.
  4. Lin, Zong-Ru; Hu, Fang-Shuo (2019). "Unravel the Century-old Mystery of Trictenotomidae: Natural History and Rearing Technique for Trictenotoma formosana Kriesche, 1919(Coleoptera: Trictenotomidae)". Taiwanese Journal of Entomological Studies. 4 (1): 1–8.
  5. Leschen, Richard A.B.; Beutel, Rolf G.; Lawrence, John F. (2011). Morphology and Systematics (Elateroidea, Bostrichiformia, Cucujiformia partim). Walter de Gruyter. p. 704.
  6. Lin, Meiying; Yang, Xingke (2007). "The genus Autocrates THOMSON in China: occurrence and geographical distribution of species (Coleoptera: Trictenotomidae)" (PDF). Bulletin de L'Institut Royal des Sciences naturelles de Belgique. Entomologie. 77: 147–156.
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