Miocalles superstes (Zimmerman)

Marotiri Miocalles Weevil (Miocalles superstes)

Distribution:

Austral Islands: Marotiri Rocks

local names: –

***

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

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Rhyncogonus caudatus Van Dyke

Tailed Rhyncogonus Weevil (Rhyncogonus caudatus)

This species is endemic to the island of Huahine, where it can be found on the leaves of several non-native and native plants, including nahe (Angiopteris evecta (G. Forst.) Hoffm.).

The animals are black in colour and bear some larger, white scales on the sides of the head, the body, and above all, the abdomen, where they build some kind of a short process.

The males reach a length of about 1,15 cm, the females, with 1,4 cm, are distinctly larger. [1]

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References:

[1] Edwin C. Van Dyke: Rhyncogonus of the Mangarevan Expedition. Bishop Museum Occasional Papers 13(11): 89-129. 1937

Rhyncogonus submetallicus Van Dyke

Tahitian Metallic Rhyncogonus Weevil (Rhyncogonus submetallicus)

The Tahitian Metallic Rhyncogonus Weevil was described in 1933.

The species reaches a length of about 1,3 cm, the upper side is glossy black with metallic greenish bronze shining elytra, it is covered with gray to very light fulvous hair. [1]

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References:

[1] Edwin C. Van Dyke: Rhyncogonus submetallicus, new species, from Tahiti. Bishop Museum Bulletin 113: 51-52. 1933

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

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

Lyperobius carinatus Broun

Keeled Lyperobius Weevil (Lyperobius carinatus)

The Keeled Lyperobius Weevil, described in 1881, is endemic to the alpine regions of New Zealand’s South Island.

The quite large, flightless beetle reaches a length of about 2 to 2,5 cm, the body is reddish-brown to black and covered with white or yellowish white scales, which form keel-like longitudinal stripes on the elytra.

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.

~~~

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.)

Oclandius vestitus (Broun)

Snares Oclandius Weevil (Oclandius vestitus)

The Snares Oclandius Weevil was described in the year 1909.

The flightless species reaches a body length of only 0,12 cm, it occurs exclusively on some of the Snares Islands.

The beetles are nocturnal and obviously feed mainly on the leaves of the Snares Islands Anisotome (Anisotome acutifolia (Kirk) Cockayne) and Lyall’s Tree Daisy (Olearia lyallii Hook. f.).

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Depiction from: ‘Chas. Chilton: The Subantarctic Islands of New Zealand. Reports on the Geo-Physics, Geology, Zoology, and Botany of the Islands lying to the south of New Zealand, based mainly on observations and collections made during an Expedition in the Government Steamer “Hinemoa” (Captain J. Bollons) in November 1907. Wellington, N.Z., printed by J. Mackay, Government Printer 1909′

(public domain)

Allodessus skottsbergi (Zimmermann)

Skottsberg’s Diving Beetle (Allodessus skottsbergi)

Distribution:

Rapa Nui: Rapa Nui

local names: –

***

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]

***

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]

***

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