Tag Archives: Curculionidae

Miocalles superstes (Zimmerman)

Marotiri Miocalles Weevil (Miocalles superstes)

Distribution:

Austral Islands: Marotiri Rocks

local names: –

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The Marotiri Miocalles Weevil was described in the year 1936 (as Microcryptorhynchus superstes Zimmerman).

This species is known only from the tiny Southeast Islet of the Marotiri group in the south of the Austral Archipelago, where the animals can be found on St.-John’s Beggarticks (Bidens saint-johniana Sherff) and on Yellow Purslane (Portulaca lutea Soland. ex G. Forst.), on which they obviously feed.

The flightless Marotiri Miocalles Weevil is only about 0,2 cm long, and reddish brown in color. [1]

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References:

[1] Elwood C. Zimmerman: Curculionidae of Marotiri, South-Central Pacific (Coleoptera). Pacific Insects 8(4): 893-903. 1966

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edited: 30.12.2018

Dryophthorus distinguendus Perkins

Hawaiian Driftwood Weevil (Dryophthorus distinguendus)

The Hawaiian Driftwood Weevil was described in the year 1900.

The species was found first on the island of Laysan, namely in wooden boxes that came from the main islands. It was subsequently found also on nearly all of the other Hawaiian Islands (Hawai’i, Kure, Lana’i, Maui, Midway, Moloka’i, and O’ahu), but appears in lists of extinct species, which, in my opinion, is quite strange.

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References:

[1] R. C. L. Perkins: Coleoptera, Weevils. Bishop Museum Bulletin 31: 53-66. 1926

Nesotocus giffardi Perkins

Giffard’s Nesotocus Weevil (Nesotocus giffardi)

Giffard’s Nesotocus Weevil is found on the islands of Hawai’i, Kaua’i, Maui, and O’ahu.

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The genus Nesotocus, which contains four species, is now placed within the subfamily Molytinae, with the most closely related species living in Australia and New Zealand.

The males of all species can easily be distinguished from the females by their longer legs, and especially by the position of their antennae, these are placed in the anterior third of the rostrum, while in the females the antennae are placed further towards the posterior third.

The larvae of all species bore in the wood of dead olapa trees (Cheirodendron trigynum (Gaudich.) Heller) on which they feed upon, the pupation takes place inside a chamber (pupal cell), which can be detected by a distinct hole on the outside of the wood.

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References:

[1] John Colburn Bridwell: Notes on Nesotocus Giffardi Perkins (Coleoptera). Proceedings of the Hawaiian Entomological Society 4(1): 250-256. 1918
[2] Sadie A. Solomon: Systematics of the Hawaiian endemic weevil genus Nesotocus Perkins 1900 (Coleoptera: Curculionidae). Student Competition Display Presentations, Section A. Systematics, Morphology, and Evolution 2003

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Photo: Hank L. Oppenheimer
http://hear.smugmug.com

(under creative commons license (3.0))
http://creativecommons.org/licenses/by-nc/3.0

Miocalles maii Paulay

Maii Miocalles Weevil (Miocalles maii)

Distribution:

Austral Islands: Rapa

local names: –

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The Maii Miocalles Weevil was described in 1985, it is endemic to the island of Rapa, Austral Islands, where it was found on the Ma’ii-Anatakuri ridge.

The species is about 0,2 cm long and 0,09 cm wide, it is black to dark reddish brown, some individuals have lighter, reddish-brown patches centrally on their elytra. The legs are reddish brown.

The host plant of this species are native tongue fern spp. (Elaphoglossum spp.). [1]

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References:

[1] Gustav Paulay: Adaptive radiation on an isolated oceanic island: Cryptorhynchinae (Curculionidae) of Rapa revisited. Biological Journal of the Linnean Society 26: 95-187. 1985

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edited: 30.12.2018

Elytrurus niuei Zimmerman

Niue Coconut Weevil (Elytrurus niuei)

This species was described in the year 1956, it reaches a length of about 1 cm, the females are slightly larger than males.

The larvae seem to feed on the bark or wood of coconut palm trunks (Cocos nucifera L.). [1]

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References:

[1] Elwood C. Zimmerman: Description of a new species of Elytrurus and a catalogue of the known species (Colepotera: Curculionidae: Otiorhynchinae). Pacific Science 10: 286-295. 1956

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elytrurus-niuei-padil-ch

Photo: Caroline Harding
http://www.padil.gov.au

(under creative commons license (3.0))
http://creativecommons.org/licenses/by/3.0

Miocalles albolineatus Paulay

White-lined Miocalles Weevil (Miocalles albolineatus)

Distribution:

Austral Islands: Rapa

local names: –

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The White-lined Miocalles Weevil is part of a enormous radiation comprising more than 70 species all of which are endemic to the island of Rapa, Austral Islands.

The species reaches a size of about 0,2 cm, it is shiny black, the elytra are reddish-brown centrally and are decorated with bright withe squamose patterns.

The species appears to have adapted to the native Weak Chain Fern (Blechnum attenuatum (Sw.) Mett.) as host plant species. [1]

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References:

[1] Gustav Paulay: Adaptive radiation on an isolated oceanic island: Cryptorhynchinae (Curculionidae) of Rapa revisited. Biological Journal of the Linnean Society 26: 95-187. 1985

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edited: 30.12.2018

Hypocryphalus mollis (Schedl)

Tongan Pygmy Borer (Hypocryphalus mollis)

This species was described in the year 1955.

The Tongan Pygmy Borer only inhabits western Polynesia, where it can be found on the Fijian Islands, as well as in Samoa and Tonga.

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References:

[1] R. A. Beaver: The bark and ambrosia beetles (Coleoptera: Scolytidae and Platypodidae) of Tonga. New Zealand Entomologist 9: 64-70. 1987

Pentarthrum blackburni Sharp

Blackburn’s Weevil (Pentarthrum blackburni)

This species was originally known only from the immediate vicinity of Honolulu on the island of O’ahu, but was found in the year 1923 in small numbers by D. T. Fullaway on Laysan, whereto it was obviously accidentally introduced from O’ahu.

It is today considered extinct, the reasons therefore, however, seem to be unknown. [1]

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References:

[1] R. C. L. Perkins: Coleoptera, Weevils. Bishop Museum Bulletin 31: 53-66. 1926