Vespa tropica

Vespa tropica, the greater banded hornet, is a tropical species of hornet found in Southern Asia, New Guinea and west Africa, and which has recently been discovered to be an invasive species on the Pacific island of Guam. It is a predator of paper wasps and possesses a potent sting, which can cause extreme pain and swelling.

Greater banded hornet
adult
Nest
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Vespidae
Genus: Vespa
Species:
V. tropica
Binomial name
Vespa tropica
Linnaeus, 1758
Synonyms
  • Sphex tropica Linnaeus,1758
  • Vespa cincta Fabricius, 1775
  • Vespa eulemoides du Buysson, 1905

Description

The workers of Vespa tropica are about 24–26 millimetres (15⁄16–1 in) in length, while queens grow to 30 millimetres (1 1⁄4 in). The head is dark brown/red; the abdomen is black with a distinct yellow stripe which covers most of the second abdominal segment. However, there is some variation across its range and in Singapore and southeastern Asia, specimens are often completely black and larger in size, while in other regions such as Hong Kong, the head and flanks of the thorax are normally reddish.[1][2] A third colour form is found in the Andamans and Nicobars, which has a reddish brown head and thorax and all the dorsal plates on each segment of the gastrum are orange except the first.[3]

Distribution

Vespa tropica is distributed throughout southern Asia from Afghanistan to the Philippines,[2] south to New Guinea,[4] New Britain and the Torres Strait Islands but it has not been recorded in mainland Australia.[5]

Invasive

In August 2016 Vespa tropica was found at two sites in Guam,[2][6][7] and has since been deemed a permanent resident of the island's ecosystem, until a solution is found to exterminate them.[8]

Biology
Active nest of Vespa tropica attached to a wall.
Vespa tropica - collection of Filippo Turetta

Vespa tropica are raiders of the nests of other wasp species and take captured larvae back to their own nest to feed to their larvae. They have been observed to catch honeybees quite frequently, and even dragonflies have been noted as prey. A worker of V. tropica has been recorded as capturing and killing an individual of Vespa bicolor.[1] Vespa tropica is associated with forests in the lowlands, up to 2,100 metres (6,890 ft) altitude.[9] The nests are usually within 3 metres (3 yd) above the ground in tree hollows or in subterranean cavities normally down to a depth of 20 centimetres (8 in) including a record of one found inside a dead log partly buried in the soil. In the vicinity of human habitations it will nest under roofs, in attics and sheds.[2][9] The nest is normally rhomboid or bowl-shaped and has an open bottom, whereas most aerial hornets' nest are completely sealed. The outer shell of the nest consists of distinct, broad layers and the nest is quite brittle. Occasionally nests are built within the crown of trees.[1] Nest temperature is maintained at 25–30 °C (77–86 °F) until about the middle of October, when it trends towards ambient[Martin-1990 1]​ as the nest begins to die. Predation by V. tropica is one of the foremost causes of colony failure in Polistes chinensis in Japan. V. tropica may play a significant role in controlling Asian polistine populations.[10] It can be a secretive species, preferring to fly close to cover and often high among the crowns of trees.[1] V. tropica, V. ducalis, and V. philippinensis together form the sub-genus V. tropica group.[Archer-1991 1]​

References
  1. "Vespa tropica". Aculeates of Asia. vespa-bicolor.net. Retrieved 11 April 2017.
  2. "The Greater Banded Hornet Has Found Its Way To Guam". CNAS News. College of Natural and Applied Sciences, University of Guam. Retrieved 12 April 2017.
  3. P. Girish Kumar; G. Srinivasan (2010). "Taxonomic studies of hornet waps (Hymenoptera: Vespidae) Vespa Linnaeus of India" (PDF). Records of the Zoological Survey of India. 110 (2): 57–80.
  4. P. Barss (1989). "Renal failure and death after multiple stings in Papua New Guinea. Ecology, prevention and management of attacks by vespid wasps. (abstract)". Medical Journal of Australia. 151 (11-12 Pages = 659-63): 659–63. PMID 2593913.
  5. Joseph Bequeart (1936). "The common oriental hornets, Vespa tropica and Vespa affinis, and their color forms". Treubia. 15 (4 Pages = 329-512).
  6. Madlambayan, Sophia (2019-05-06). "Vespa Tropica: New invasive species found on Guam". University of Guam Triton's Call. Retrieved 2021-01-15.
  7. "Great Banded Hornet" (PDF). University of Guam College of Natural and Applied Sciences.
  8. Shawn Raymundo (16 September 2016). "University of Guam scientists: Hornet eradication unlikely". Pacific Daily News. Retrieved 12 April 2017.
  9. Michael E. Archer (2008). "Taxonomy, distribution and nesting biology of species of the genera Provespa Ashmead and Vespa Linnaeus (Hymenoptera, Vespidae)" (PDF). Entomologist's Monthly Magazine. 144 (1727): 69–101.
  10. Miyano, Shinya (1980). "Life tables of colonies and workers in a paper wasp, Polistes chinensis antennalis in central Japan". Population Ecology. 22: 69–88. doi:10.1007/bf02513536.
  1. p. 306, "V. tropica This species controls its nest temperature effectively despite its small colony size (Fig. 5). V. tropica colonies in the study area are less than one-tenth the sue of V. simillima colonies. Although the nest temperature is lower than that in V. simillima it is still well above ambient; it is stable and reaches a maximum around the time the sexuals are being produced."
  • Archer, Michael E. (25 November 1991). "Taxonomy and bionomics of the Vespa tropica group (Hym., Vespinae)". Entomologist's Monthly Magazine. 127: 225–232.
  1. p. 228, "V. tropica, V. ducalis and V. philippinensis can be separated from all other species of Vespa by the following combination of characters of which 1, 3 and 4 are considered derived and 2 and 5 primitive (Archer, unpublished).
    • 1. First gastral tergum long, as seen from above, about half as long or longer than wide (fig. 1A).
    • 2. Pretegula carina complete (fig. 1 B).
    • 3. Lateral apical margin of the clypeus produced as a blunt triangular projection, greater than a semicircle (fig. 1 C).
    • In addition the following male characters should also be used.
    • 4. Apical margin of the seventh gastral sternum slightly concave (fig. 1 D).
    • 5. Apical margin of the sixth gastral sternum with one shallow emargination, less than a semicircle (fig. 1 D)"
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