Tag Archives: Beetles

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

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Mumfordia spinata Van Dyke

Spined Scavenger Beetle (Mumfordia spinata)

This species was described in 1932.

The Spined Scavanger Beetle is endemic to the island of Hiva Oa, Marquesas.

The biology of this species is still completely unknown.

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References:

[1] E. C. Van Dyke: Two new Lathridiidae from the Marquesas. Bishop Museum Bulletin 98: 237-234. 1932

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

Proterhinus adamsoni Perkins

Adamson’s Proterhinus (Proterhinus adamsoni)

This reddish colored species was described in the year 1932.

The species is known only from the island of Hatuta’a, where it lives among the stems of the Tomentose Waltheria (Waltheria tomentosa J. R. Forst. & G. Forst.)

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References:

[1] ‘R. C. L. Perkins: On two new species of Proterhinus from the Marquesas and the Inclusion of this genus in the family Aglycyderidae. Bishop Museum Bulletin 98. 17-21. 1932

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Depiction from: ‘R. C. L. Perkins: On two new species of Proterhinus from the Marquesas and the Inclusion of this genus in the family Aglycyderidae. Bishop Museum Bulletin 98. 17-21. 1932’

(This image is in the public domain because its copyright has expired.)

Allodessus skottsbergi (Zimmermann)

Skottsberg’s Diving Beetle (Allodessus skottsbergi)

Distribution:

Rapa Nui: Rapa Nui

local names: –

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Skottsberg’s Diving Beetle was described in 1924, it is known only from the island of Rapa Nui.

The species reaches a body length of about 0,2 to 0,23 cm and is yellowish to ferruginous colored, males and females are superficially identical.

The beetle inhabits the crater lakes of Rapa Nui, where it lives among algae, it is a predacious species. [1][2]

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The beetle is known already from subfossil core samples, where its remains can be found at a depth of about 15,5 m, in sediments that were deposited before the first Polynesian settlers appeared, which means that the species indeed is at least native to Rapa Nui, perhaps even endemic. [4]

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Skottsberg’s Diving Beetle was apparently not recorded during recent field studies and may in fact already join the list of extinct species. [3]

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References:

[1] A. Zimmermann: Coeloptera-Dytiscidae von Juan Fernandez und der Osterinsel. in The Natural history of Juan Fernandez and Easter Island, edited by Carl Skottsberg. Vol. 3: 299-304., Zoology. Uppsala: Almqvist & Wiksells Boktryckeri, 1921-1940
[2] Michael Balke; Ignacio Ribera: Jumping across Wallace’s line: Allodessus Guignot and Limbodessus Guignot revisited (Coleoptera: Dytiscidae, Bidessini) based on molecular-phylogenetic and morphological data. Australian Journal of Entomology 43(2): 114-128. 2004
[3] Konjev Desender; Léon Baert: The Coleoptera of Easter Island. Bulletin de l’Institut royal des Sciences naturelles de Belgique. Entomologie 66: 27-50.1996
[4] M. Horrocks; M. Marra; W. T. Baisden; J. Flenley; D. Feek; L. González Nualart; S. Haoa-Cardinali; T. Edmunds Gorman: Pollen, phytoliths, arthropods and high-resolution 14C sampling from Rano Kau, Easter Island: evidence for late Quaternary environments, ant (Formicidae) distributions and human activity. Journal of Paleolimnology 50(4): 417-432. 2013

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edited: 23.06.2017, 11.12.2018

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

Protopeltis viridescens (Broun)

Green Bark-gnawing Beetle (Protopeltis viridescens)

The Green Bark-gnawing Beetle was described in the year 1886.

The species reaches a size of only about 0,25 cm.

The larvae of this species can be found on the bark of dead southern beeches, where they probably feed on fungi, the same applies for the adult beetles, which are probably fungivorous too.

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References:

[1] Jiří Kolibáč: Trogossitidae: A review of the beetle family, with a catalogue and keys. ZooKeys 366: 1-194. 2013

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protopeltis-viridescens-jk-t

Photo from: ‘Jiří Kolibáč: Trogossitidae: A review of the beetle family, with a catalogue and keys. ZooKeys 366: 1-194. 2013’

(under creative commons license (4.0))
http://creativecommons.org/licenses/by/4.0

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edited: 04.10.2016

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

Blackburnia micantipennis (Sharp)

Waimea Ground Beetle (Blackburnia micantipennis)

This species occurred only on the leeward reaches of the Waimea Canyon on the island of Kaua’i, at elevations of 600 to 1270 m.

The Waimea Ground Beetle is thought to have been a riparian species, since all localities this species was found, are along the tributaries of the Waimea River.

The last specimens of this species were obviously collected in the year 1935. [1]

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References:
[1] J. K. Liebherr; E. C. Zimmerman: Insects of Hawaii: Hawaiian Carabidae (Coleoptera), Part 1: Introduction and Tribe Platynini. University of Hawaii Press 2000