Rhynchodes ursus

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Rhynchodes ursus
Rhynchodes ursus 52941957.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Coleoptera
Family: Curculionidae
Genus: Rhynchodes
Species:
R. ursus
Binomial name
Rhynchodes ursus
White, 1846 [1]

Rhynchodes ursus, also known as the elephant weevil, is a weevil in the Curculionidae family. [2] It is endemic to New Zealand. It is a wood-boring weevil found throughout New Zealand.

Contents

Taxonomy

This species was first described by Adam White in 1846. [3]

Description

R. ursus illustration Plate 3, Figure 16 The zoology of the voyage of the H.M.S. Erebus and Terror (10328236673) (cropped).jpg
R. ursus illustration

The adults of this species were originally described by White as follows:

Deep brown ; the thorax with two longitudinal bands of a lighter colour near the side ; elytra above with five rows of hairs, on each side of which is a row of very deep punctures, between every two of which is a smoothish ridge ; across the elytra are two obscure, dark brown bands ; legs black, femora above at the end with a spot of yellowish brown hairs ; abdomen beneath with the last segment having two tufts of hair.
Length, 1012 lines. [3]

This large weevil has a deep brown colour with two lighter bands near the side of its thorax. It has black legs with a spot of yellowish-brown hairs on each femur. [3] It has dense scales on its body, which can be hair-like. In female specimens the antennae are inserted halfway along the rostrum and nearer the front in males. [1] This species varies greatly in size, colour, and in the amount and nature of its hair-like scales. Male specimens are covered with short scale-like hairs, whilst females are have longer, deep brown, or grey, longer more shaggy scale-like hairs. Old individuals are occasionally met with quite black and shining, and almost destitute of any scales whatsoever. [4]

The larvae of R. ursus can be distinguished from other weevil larvae as it is large in size and has broad rounded ends to its premedial plates on its exoskeleton. [5]

Distribution

This species is endemic to New Zealand and is found throughout the country. [2] [4]

Behaviour

R. ursus at night Rhynchodes ursus 164521857.jpg
R. ursus at night

This species is active at night and is able to fly. [6]

Hosts

Adult weevils are found on trees, where they gather to feed on sap. Larvae tunnel into dead trunks and branches of southern beeches, rimu and Dracophyllum traversii . [1]

Parasites

The larvae of R. ursus are the host of New Zealand's largest parasitic wasp, Certonotus fractinervis . Female wasps use a long ovipositor to lay eggs inside the larvae whilst those larvae develop inside trees. [4]

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References

  1. 1 2 3 Christopher H. C. Lyal (2 December 1993). "Cryptorhynchinae (Insecta: Coleoptera: Curculionidae)" (PDF). Fauna of New Zealand. 29. Manaaki Whenua – Landcare Research: 53–54. doi:10.7931/J2/FNZ.29. ISSN   0111-5383. OCLC   30833033. Wikidata   Q45061236. Archived from the original (PDF) on 19 February 2021.
  2. 1 2 "Rhynchodes ursus White, 1846". Biota of New Zealand. 8 March 2011. Retrieved 19 October 2024.
  3. 1 2 3 Richardson, John & Gray, John Edward (1844–1875). The zoology of the voyage of the H.M.S. Erebus & Terror, under the command of Captain Sir James Clark Ross, during the years 1839 to 1843. London: E. W. Janson. p. 16. Retrieved 26 February 2018.PD-icon.svg This article incorporates text from this source, which is in the public domain .
  4. 1 2 3 George Vernon Hudson (1934), New Zealand beetles and their larvae: an elementary introduction to the study of our native Coleoptera, Ferguson and Osborn Limited, pp. 154–155, Wikidata   Q130559277 PD-icon.svg This article incorporates text from this source, which is in the public domain .
  5. Brenda Mabel May (14 June 1993). "Larvae of Curculionoidea (Insecta: Coleoptera): a systematic overview". Fauna of New Zealand. 28. Manaaki Whenua – Landcare Research: 69–70. doi:10.7931/J2/FNZ.28. ISSN   0111-5383. OCLC   28834752. Wikidata   Q45061695.
  6. Andrew Crowe (2017). Which New Zealand insect?. Auckland: Penguin Books. p. 48. ISBN   978-0-14-100636-9. OL   3731007M. Wikidata   Q105622564.