Minidonta extraria Cooke & Solem

Strange Disc Snail (Minidonta extraria)

This species was described in the year 1976 from three specimens, of which one was found on the island of Akamaru, one on the island of Mangareva, and one on the island of Taravai.

The shells reach an average size of 0,29 cm in diameter.

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References:

[1] Alan Solem: Endodontoid land snails from Pacific Islands (Mollusca: Pulmonata: Sigmurethra). Part I, Family Endodontidae. Field Museum of Natural History Chicago, Illinois 1976
[2] Ahmed Abdou; Philippe Bouchet: Nouveaux gastéropodes Endodontidae et Punctidae (Mollusca, Pulmonata) récemment éteints da l’archipel des Gambier (Polynésie). Zoosystema 22(4): 689-707. 2000

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Hypolimnas bolina (L.)

Blue Moon Butterfly (Hypolimnas bolina)

The Blue Moon Butterfly, also known under the markedly ugly name Great Eggfly, was described in 1764.

The species has an exceptional wide area of distribution, which stretches from Madagascar over Asia and Australia into eastern Polynesia.

Three of the several subspecies occur within the Polynesian region, these are: Hypolimnas bolina ssp. otaheitae (Felder), which occurs on the Austral- and the Cook Islands, the Marquesas, the Society Islands, the Pitcairn Islands, and on Rapa Nui; Hypolimnas bolina ssp. pallescens (Butler), which is found in Fiji, in Tokelau, in Tonga, and in Samoa; Hypolimnas bolina ssp. rarik (Eschscholtz), which occurs in some parts of Kiribati as well as in Tuvalu. Another subspecies, Hypolimnas bolina ssp. nerina (Fabricius) is native to Australia and regularely visits New Zealand, but has not yet established a breeding population there, but probably will do so in time, and thus should be mentioned here too.

Males and females show a striking sexual dimorphism, males are always black with some white spots on the wings, which again are surrounded by a glossy dark blue ring. The females are much more variable in coloration, they furthermore produce several morphotypes, which, in appearance, often resemble other butterfly species, a phenomenon called mimicry.

The males are very territorial, while the females are wandering over wide ranges.

The larvae feed on plant species from the Acanthaceae, Amaranthaceae, Asteraceae, Malvaceae and the Urticaceae family.

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In Niue this butterfly is called pepe mahina lanu.

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References:

[1] R. H. Van Zwaluwenburg: The Insects of Canton Island. Proceedings of the Hawaiian Entomological Society 11(3): 300-312. 1943
[2] Alden D. Hinckley: Ecology of Terrestrial Arthropods on the Tokelau Atolls. Atoll Research Bulletin 124: 1-18. 1969
[3] Jaqueline Y. Miller; Lee D. Miller: The Butterflies of the Tonga Islands and Niue, Cook Islands, with the Descriptions of two new subspecies. Bishop Museum Occasional Papers 34: 1-24. 1993
[4] Brian Patrick; Hamish Patrick: Butterflies of Fiji. The Weta 24(1): 5-12. 2002
[5] Neal L. Evenhuis: Checklist of Fijian Lepidoptera. Bishop Museum Technical Report 38(13): 1-53. 2007
[6] Brian Patrick; Hamish Patrick: Butterflies of the South Pacific. Otago University Press 2012

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Photo: Antonio Machado; by courtesy of Antonio Machado

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edited: 18.08.2017

Fimbristylis cymosa R. Br.

Hurricane-Grass (Fimbristylis cymosa)

Distribution:

Austral Islands: Rimatara, Rurutu, Tubuai
Cook Islands: ‘Atiu, Mangaia, Manihiki, Manuae, Ma’uke, Miti’aro, Nassau, Palmerston, Pukapuka, Rakahanga, Rarotonga, Suwarrow, Tongareva
Fiji: Rotuma, Viti Levu
Gambier Islands: Mangareva, Taravai, Totegegie
Hawai’i Islands: French Frigate Shoals, Hawai’i, Kaua’i, Kure, Lana’i, Laysan, Lehua, Maui, Midway, Moloka’i, Ni’ihau, O’ahu
Kiribati: Abariringa, Baker Island, Enderbury Island, Jarvis Island, Kiritimati, Manra, Nikumaroro, Orona, Palmyra-Atoll, Tabuaeran, Teraina
Marquesas: Eiao, Ua Huka
Niue
Pitcairn Islands: Henderson Island
Samoa: ‘Aunu’u, Fanuatapu, Nu’ulua, Nu’utele, Ofu, Olosega, Savai’i, Ta’u, Tutuila
Society Islands: Bora Bora, Huahine, Maiao, Me’eti’a, Mo’orea, Ra’iatea, Taha’a, Tahiti, Tetiaroa, Tupai
Tokelau: Atafu, Fakaofo, Nukunonu, Olohega
Tonga: ‘Eua, Fafa, Fukave, Malinoa, Manima
Tuamotu Archipelago: Apataki, Hao, Makatea, Manihi, Niau, Rangiroa, Takapoto, Tenarunga, Tikehau, Toau
Tuvalu: Nui
Wallis & Futuna: Futuna, ‘Uvea

local name:

mati upoo – Tuamotu Archipelago
mauku – ‘Atiu, Manihiki, Rakahanga, Tongareva / Cook Islands
mau’u’aki’aki – Hawai’i Islands
mouku – Tuamotu Archipelago
kukuti – Tuamotu Archipelago
pako pako – Tahiti / Society Islands
papa ‘enua – Ma’uke / Cook Islands
pupu – Rotuma / Fiji
te uteute ni mane – Kiribati
tuise – Tokelau
tumu ‘enua – Palmerston / Cook Islands
uti’uti hu’a – Society Islands
vayavaya – Nassau, Pukapuka / Cook Islands

~~~

Two of three accepted subspecies of this species are known to occur within the Polynesian region, Fimbristylis cymosa ssp. cymosa R. Br. and Fimbristylis cymosa ssp. umbellatocapitata (Hillebr.) T. Koyama.

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References:

[1] Albert C. Smith: Flora Vitiensis Nova: A new flora of Fiji (Spermatophytes only). Vol. 1. Lawai, Kauai, Hawaii 1979

Ocypode pallidula Hombron & Jacquinot

Common Ghost-Crab (Ocypode pallidula)

Distribution:

Austral Islands: Raivavae, Rurutu
Cook Islands: ‘Atiu, Aitutaki, Ma’uke, Mangaia, Manuae, Miti’aro, Nassau, Palmerston, Pukapuka, Rakahanga, Rarotonga, Tongareva
Gambier Islands: Aukena, Mangareva
Hawai’i Islands: Laysan, Midway, O’ahu
Norfolk Islands: Norfolk Island
Tuamotu Archipelago: Manihiki, Marutea (Sud), Moruroa, Raraka
Wallis & Futuna: Alofi

local names:

‘atike – Aitutaki / Cook Islands
kalami – Pukapuka / Cook Islands
kohiti – Rakahanga / Cook Islands
kohitihiti – Tongareva / Cook Islands
ko’iti – Rarotonga / Cook Islands
tike – Ma’uke / Cook Islands
tiketike – ‘Atiu, Miti’aro / Cook Islands
titorotai – Mangaia / Cook Islands

***

The Common Ghost-Crab is indigenous in the Indo-Pacific region, where it can be found running about the beaches in search for food, and digging burrows in the sand.

It is a rather small species, reaching a carapace size of about 2,5 cm in diameter.

On the Cook Islands, where the species seems to be very common, it is known by several names, including ‘atike, kalami, kohiti, kohitihiti, ko’iti, tike, tiketike and titorotai.

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References:

[1] Katsushi Sakai; Michael Türkay: Revision of the genus Ocypode with the description of a new genus, Hoplocypode (Crustacea: Decapoda: Brachyura). Memoirs of the Queensland Museum 56(2): 665-793. 2013

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Photo: J. Poupin; by courtesy of J. Poupin

http://decpoda.ecole-navale.fr/index.php
http://decapoda.free.fr

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edited: 17.12.2018

Pomarea gambieranus (Lesson)

Mangarevan Flycatcher (Pomarea gambieranus)

This very enigmatic bird was found in the year 1840 on the island of Mangareva, the largest of the Gambier Islands, and was described in the year 1844 as Lanius gambieranus.

The sole known specimen does not exist anymore, as does the only depiction of this specimen. The description is not very meaningful, the bird had a size of 14 cm, was brown on the upper side, yellowish colored on the underside.

~~~

In my opinion, it is quite possible that this is indeed a monarch flycatcher species, possibly from the genus Pomarea or alternatively from another, yet completely distinct, now extinct genus.

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References:

[1] J.-C. Thibault; A. Cibois: From early Polynesian settlements to present: bird extinctions in the Gambier Islands. Pacific Science 66(3): 1-26. 2011

Anceyodonta andersoni Cooke & Solem

Anderson’s Disc Snail (Anceyodonta andersoni)

Anderson’s Disc Snail was described in the year 1976.

The species was originally known only based on specimens that had been collected in 1934 on the island of Mangareva, but was subsequently (in 2000) recorded in form of subfossil shells from Taravai, Mangareva’s neighbor island, as well.

The shells of the species reached an average size of 0,29 to 0,36 cm in diameter.

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References:

[1] Alan Solem: Endodontoid land snails from Pacific Islands (Mollusca: Pulmonata: Sigmurethra). Part I, Family Endodontidae. Field Museum of Natural History Chicago, Illinois 1976
[2] Ahmed Abdou; Philippe Bouchet: Nouveaux gastéropodes Endodontidae et Punctidae (Mollusca, Pulmonata) récemment éteints da l’archipel des Gambier (Polynésie). Zoosystema 22(4): 689-707. 2000

Coenobita perlatus H. Milne Edwards

Strawberry Hermit Land Crab (Coenobita perlatus)

This species is distributed throughout the whole tropical Indopacific region, from the coasts of Africa up to East Polynesia, where it can be found in large numbers especially on the atolls of the Tuamotu Archipelago.

The animals mostly stay close to the beaches, where they feed on all applicable things they can get, including seeds washed up to the beach or fallen coconuts, but also washed up fish and dead seabirds.

Strawberry Hermit Land Crabs prefer the shells of sea snails of the genus Turbo.

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References:

[1] Alden D. Hinckley: Ecology of Terrestrial Arthropods on the Tokelau Atolls. Atoll Research Bulletin 124: 1-18. 1969
[2] J. C. Yaldwyn; Kasimierz Wodzicki: Systematics and ecology of the land crabs (Decapoda: Coenobitidae, Grapsidae and Gecarcinidae) of the Tokelau Islands, Central Pacific. Atoll Research Bulletin 235: 1-59. 1979
[3] S. A. Hathaway; K. McEachern; R. N. Fisher: Terrestrial Forest Management Plan for Palmyra Atoll: U.S. Geological Survey Open-File Report 2011-1007, 78 p. 2011

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Photo: J. Poupin; by courtesy of J. Poupin

http://decapoda.ecole-navale.fr/index.php
http://decapoda.free.fr

Exelastis pumilio (Zeller)

Dwarf Feather Moth (Exelastis pumilio)

This widespread species is native to Africa and Asia, and probably also to Melanesia and parts of Polynesia, where it is found on the Fijian Islands, in Samoa, on the Austral – and the Society Islands, on the Marquesas and on the Gambier Islands.

The moths have a wingspan of 1,2 to 1,5 cm.

The caterpillars feed on various species of several plant families, including Fabaceae and Oxalidaceae.

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References:

[1] Koji Yano: Notes on South Pacific Pterophoridae (Lepidoptera). Pacific Insects 5(4): 849-871. 1963
[2] Karin S. Kami; Scott E. Miller: Samoan Insects and related Arthropods: Checklist and Bibliography.Bishop Museum Technical Report 13. 1998
[3] Neal L. Evenhuis: Checklist of Fijian Lepidoptera. Bishop Museum Technical Report 38(13): 1-53. 2007

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Photo: Peter T. Oboyski; by courtesy of Peter T. Oboyski

http://nature.berkeley.edu/~poboyski/Lepidoptera/SocietyIslands.htm

Boerhavia tetrandra G. Forst.

Boerhavia tetrandra

Distribution:

Austral Islands: Maria, Raivavae, Rimatara, Tubuai
Cook Islands: Aitutaki, ‘Atiu, Manihiki, Manuae, Ma’uke, Miti’aro, Nassau, Palmerston, Pukapuka, Rakahanga, Rarotonga, Suwarrow, Takutea, Tongareva
Gambier Islands: Aukena, Gaioio, Kouaku, Mangareva, Tararua-Roa, Tauna, Tekava, Temoe, Totegegie, Vaiatekeue
Kiribati: Baker, Flint, Howland, Jarvis, Kiritimati, Nikumaroro, Orona, Palmyra, Tabuaeran, Teraina, Vostok
Pitcairn Islands: Henderson Island, Oeno, Pitcairn Island (?)
Samoa: Rose Atoll
Society Islands: Bora Bora, Huahine, Mai’ao, Manuae, Maupiha’a, Maupiti, Mo’orea, Motu One, Ra’iatea, Taha’a, Tahiti, Tetiaroa, Tupai
Tokelau: Atafu, Faka’ofo, Nukunonu, Olohega
Tuamotu Archipelago: Ahe, Ahunui, Anaa, Apataki, Arutua, Fakahina, Fakarava, Fangatau, Fangataufa, Hao, Hiti, Kauehi, Makatea, Manihi, Marutea Sud, Moruroa, Napuka, Niau, Nukutipipi, Paraoa, Rangiroa, Raraka, Raroia, Takapoto, Takaroa, Takume, Tatakoto, Tenarunga, Tepoto Nord, Tikehau, Tikei, Toau, Tureia, Vahanga, Vanavana
Tuvalu: Funafuti, Nui

local names:

katuri – Manihiki / Cook Islands
momoe – Nassau, Pukapuka / Cook Islands
naunau – Raraka / Cook Islands
runa – ‘Atiu / Cook Islands
tiale katuri – Tongareva / Cook Islands

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edited: 10.04.2019

Nesolyncides io Fennah

Io Delphacid (Nesolyncides io)

This species, the only one in its genus, was described in the year 1958 on the basis of material, which was collected in 1934 by the entomologist Elwood C. Zimmerman on the island of Mangareva.

The Io Delphacid is very probably one of the few, at least historically known, endemic species of the island, however, whether the species is still extant is not known to me. [1]

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References:

[1] R. G. Fennah: Fulgoroidea of south-eastern Polynesia. Transactions of the Royal Entomological Society of London 110(6): 117–220. 1958