Prionus laticollis

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Prionus laticollis
Prionuslaticollis.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Coleoptera
Infraorder: Cucujiformia
Family: Cerambycidae
Genus: Prionus
Species:
P. laticollis
Binomial name
Prionus laticollis
(Drury, 1773)
Synonyms [1]
  • Prionus brevicornis Fabricius, 1801
  • Prionus densus Casey, 1924
  • Prionus frosti Casey, 1924
  • Prionus kempi Casey, 1912
  • Prionus nigrescens Casey, 1924
  • Prionus parvus Casey, 1912

Prionus laticollis, also known as the broad-necked root borer or broad necked prionus, is a root-boring longhorn beetle described by Dru Drury in 1773. [1] [2] It is widespread throughout eastern North America: its range covers a vast swath from Quebec in the northeast to Arkansas in the southwest. [3]

The larvae damage trees and other plants by feeding on their roots. They are mostly active during dusk and at night. They are good burrowers and hide at the base of oak trees and other food sources. The female is larger than the male, with an ovipositor used to deposit eggs. When the female is laying eggs, she "shivers" and eggs are laid through the ovipositor, positioned down into the soil or under litter, usually in groups of threes and twos, but sometimes ones or fours. After the eggs are laid, the female moves her ovipositor up and down to fill the hole she created. When freshly laid, the eggs are pure white, glistening with moisture, but, after a while, they usually change to a deep yellow. Within a few days, the deep yellow eggs turn to a light washed pink. As the larvae develop inside, the eggs turn ivory in color. The eggs are the size of small grains of rice. When the larvae are hatching, they chew through one of the elongated, pointed sides of the egg. The larvae's heads are adapted for digging into the soil, and they have strong black mandibles for chewing roots. [4]

Larvae tunnel downward to feed on the living roots of a variety of trees and shrubs. At first, they may feed on bark, but then proceed to hollow out small roots. They often feed on dead wood, with a preference for soft food. [4] Pupation occurs in spring, about 10 cm under the ground. During pupation parts of the digestive tract degenerate. [5] The life cycle is probably three years.

This beetle is about 2-5 cm long, with the females significantly larger than the males. Males fly more often and are attracted to lights. [6]

Identification

Prionus laticollis with ovipositor extended laying eggs Prionus Laticollis with ovipositer extended laying eggs.jpg
Prionus laticollis with ovipositor extended laying eggs

The species is distinct among the eastern American species of Prionus for its rugose-punctate elytral texture and antennae with 12 antennomeres. Other species have 12 antennomeres, but have simple punctate elytra (such as P. pocularis ) or have more than 12 antennomeres (such as P. imbricornis ). [3]

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References

  1. 1 2 Bezark, Larry. "New World Cerambycidae Catalogue" . Retrieved July 11, 2022.
  2. "Prionus laticollis (Drury, 1773)". Integrated Taxonomic Information System . Retrieved 21 November 2023.
  3. 1 2 Santos-Silva, Antonio; Nearns, Eugenio; Swift, Ian (July 4, 2016). "Revision of the American species of the genus Prionus Geoffroy, 1762 (Coleoptera, Cerambycidae, Prioninae, Prionini)". Zootaxa. 4134 (1): 59–64. doi:10.11646/zootaxa.4134.1.1. PMID   27395701 via ResearchGate.
  4. 1 2 Goldman, Edward H. (1933). "Comparisons of the mouth-parts of adult longhorn beetles with reference to their food (Coleoptera: Cerambycidae)". Transactions of the American Entomological Society. 59 (2): 85–102. JSTOR   25077293.
  5. Benham, Gerald S. (15 September 1970). "Gross morphology and transformation of the digestive tract of Prionus laticollis (Coleoptera: Cerambycidae)". Annals of the Entomological Society of America. 63 (5): 1413–1419. doi:10.1093/aesa/63.5.1413 . Retrieved 26 August 2022.
  6. "Species Prionus laticollis – Broad-necked Root Borer". bugguide.net. Retrieved 2017-08-31.