Geodorcus
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Geodorcus
''Geodorcus'' is a genus of beetles belonging to the family Lucanidae. They are endemic to New Zealand. All ''Geodorcus'' species are protected under Schedule 7 of Wildlife Act 1953, The 1953 Wildlife Act, making it an offense to hunt, kill or possess a specimen. List of species There are ten species: * '' Geodorcus alsobius'' * ''Geodorcus auriculatus'' * ''Geodorcus capito'' * ''Geodorcus helmsi'' * ''Geodorcus ithaginis'' * ''Geodorcus montivagus'' * ''Geodorcus novaezealandiae'' * ''Geodorcus philpotti'' * ''Geodorcus servandus'' * ''Geodorcus sororum'' References

Lucanidae genera Lucaninae Beetles of New Zealand Endemic fauna of New Zealand Endemic insects of New Zealand {{Lucanidae-stub ...
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Geodorcus Helmsi
''Geodorcus helmsi'', known as New Zealand giant stag beetle or Helms's stag beetle, is a large, slow-moving, flightless stag beetle in the family Lucanidae. It is Endemism, endemic to New Zealand. Description ''Geodorcus helmsi'' varies in colour from black to brownish-black. Its dorsal surface can vary from dull to glossy. Like other stag beetles, they show sexual dimorphism: males range in size from 17.5–44.0 mm, including their large mandibles, while females are smaller (16.5–27.5 mm) with less conspicuous mandibles. In larger male specimens, the mandibles are long, slender and strongly arched with a conspicuous tooth near their base. ''G. helmsi'' is distinguished from other ''Geodorcus'' by its straight un-arched tibiae, and five setose ridges on the elytra. File:Geodorcus helmsi (Sharp, 1881) male Syn. Lissotes helmis (Sharp, 1881) (3256464796).jpg, ''Geodorcus helmsi'' File:Geodorcus helmsi m d.tif, ''Geodorcus helmsi'' File:Geodorcus helmsi.jpg, A male (lef ...
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Geodorcus Novaezealandiae
''Geodorcus novaezealandiae'' is a large flightless species of stag beetle in the family Lucanidae. It is the type species and smallest member of the genus ''Geodorcus''. It is endemic to New Zealand. Description This species is considerably smaller than other members of ''Geodorcus''. Male Helm's stag beetle have been collected that are 44 mm including mandibles, whereas male ''Geodorcus novaezealandiae'', including the mandibles, range in size from 12 to 21.5 mm. Females are generally smaller, ranging in size from 11 to 17.4 mm. Like all other ''Geodorcus'', they show sexual dimorphism: the male beetle has a much wider head and larger mandibles. They have a dull to slightly glossy black exoskeleton with obvious raised ribs on the elytra. Distribution This species is found in the south of the North Island. Its range extends from the Akatarawa Valley in the Tararua Range in the north of the region to the Aorangi Range The Aorangi Range (also known as the H ...
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Geodorcus Sororum
''Geodorcus sororum'' is a large flightless species of stag beetle in the family Lucanidae. It was discovered in 1973 by Mr. A. Wright on an expedition to Middle Sister Island/Te Awanui, one of The Sisters (New Zealand), The Sisters Islands/Rangitatahi which are part of the Chatham Islands in New Zealand. This holotype specimen is held in the New Zealand Arthropod Collection. It was first described by Beverley Anne Holloway, Beverley Holloway in 2007. The name ''sororum'' is translated from Latin to mean "belonging to the sisters". Description and taxonomy This beetle ranges in length (including mandibles) from 18.0 to 28.5 mm (males) and from 19.4 to 24 mm (females). It has a glossy exoskeleton which ranges in colour from reddish-black to black. Like ''Geodorcus servandus'', its elytron, elytra are not distinctly ribbed. This is a feature that distinguishes ''G. sororum'' from ''G. capito'' which is also found in the Chatham Islands. They demonstrate sexual dimorphis ...
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Geodorcus Servandus
''Geodorcus servandus'' is a large flightless species of stag beetle in the family Lucanidae. It was discovered by P.R. Kettle in December 1960 and this holotype specimen is held in the New Zealand Arthropod Collection. It was first described by Beverley Holloway in 2007. Its type location is Mount Tuhua summit, near Lake Kaniere on the West Coast of New Zealand. The name ''servandus'' is a Latin word meaning " omethingto be preserved, conserved, looked after". Description This large ''Geodorcus'' ranges in length (including mandibles) from (males) and from (females). Despite being larger than many other ''Geodorcus'' species, the mandibles are relatively short. They demonstrate sexual dimorphism with an overall size difference and obvious differences in mandible shape and size. Male and female specimens also differ in the depth of small punctures on the dorsal surface; males being shallow and females deep. In both, the pitted surface is conspicuous. The exoskeleton ranges fro ...
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Geodorcus Auriculatus
''Geodorcus auriculatus'' is a large flightless stag beetle that is found in the southern part of the Coromandel Peninsula and on Mount Te Aroha in the Kaimai range of New Zealand. Description ''Geodorcus auriculatus'' are large dull to glossy black or brownish black beetles. Their exoskeleton is covered in dots and minute hairs with four inconspicuous ribs. The length for male specimens ranges from 21 to 29 mm. This length includes their impressive mandibles. Female beetles have much less variation in their size, ranging in length from 19–20 mm. Their smaller mandibles allow them to be distinguished from male beetles. Their head is widest behind the eyes and distinctly depressed and smooth in males, less so in female beetles. Distribution ''Geodorcus auriculatus'' is found from Manaia on the western side of the Coromandel Peninsula to Mount Te Aroha in the Kaimai range, south of the Coromandel. They can be found from near sea level to 950m on Mount Te Aroha. Hab ...
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Geodorcus Capito
''Geodorcus capito'' is a large flightless species of stag beetle in the family Lucanidae. It is endemic to the Chatham Islands in New Zealand. Description The exoskeleton of ''Geodorcus capito'' varies in colour from glossy black to brownish black. Adults show distinct sexual dimorphism. Including mandibles, male beetles range in length from 17.0–27.0 mm; females from 15.0–19.5 mm. Male and female beetles can be distinguished by the distinct ribbed elytra with obvious branching setae on the male beetle, whilst a female beetle has more vague ribbed elytra and barely visible setae. Distribution This stag beetle is found throughout the Chatham Islands, including on Chatham Island, Pitt Island, Rangatira, Mangere Island and Little Mangere Island Little Mangere is a small island of the Chatham Archipelago, just off the western end of Mangere Island, about 4 km (2½ mi) west of Pitt Island and south-east of the town of Waitangi on Chatham Island. The isl ...
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Geodorcus Alsobius
''Geodorcus alsobius'', or Moehau stag beetle, is a large flightless species of stag beetle in the family Lucanidae. It is found only on Mt Moehau, the highest mountain in the Moehau Range on the Coromandel Peninsula in New Zealand. Description Moehau stag beetles range in length (including mandibles) from 21.0 to 27.0 mm (males) and from 21.0 to 23.7 mm (females). They demonstrate sexual dimorphism. The exoskeleton ranges from dull to glossy. It is black in colour and is pitted throughout. Male specimens have an obvious depression on the head behind the large mandibles. The head is widest behind the eyes. Setae on the elytra are small. Male mandibles are large and curved with an obvious mid dorsal horizontal tooth Distribution ''Geodorcus alsobius'' has a very restricted range. This species is only found on Mt Moehau on the Coromandel Peninsula in New Zealand. Habitat Adult specimens of the Moehau stag beetle are found under wet rotten logs and rocks at altitudes ...
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Geodorcus Ithaginis
''Geodorcus ithaginis'', the Mokohinau stag beetle, is a large flightless species of stag beetle in the family Lucanidae. It was described by Thomas Broun in 1893 after being discovered in the Mokohinau Islands by Andreas Stewart Sandager, a lighthouse keeper on the islands. The species survives only on the small unnamed island "Stack H", in a patch of vegetation the size of a living room, and is in extreme danger of extinction. Description Including their large mandibles (used for fighting over mates), male specimens range in length from 25.5 to 32.8 mm and are 10.4–12.4 mm wide. Females range in length from 20.0–22.5 mm. Their exoskeleton is black and ranges from dull to moderately glossy. The thorax is back, glossy, and wider than it is long. The elytra are rounded at the posterior, almost equally long and wide, and covered in short branching hairs. Male beetles have three teeth at the apex of the mandibles; females have two. What distinguishes this specie ...
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Geodorcus Philpotti
''Geodorcus philpotti'' is a large flightless species of stag beetle in the family Lucanidae. It was named by Major Thomas Broun after Mr A. Philpott, who discovered it at Hump Ridge near Invercargill. It is endemic to New Zealand. Description Including their large mandibles, male specimens range in length from 20.5 to 29 mm. Females range in length from 17.0–23.6 mm. They have a dull to slightly glossy exoskeleton. Their elytra have obvious ridges. Distribution This beetle is found in the south-west of the South Island from the coast adjoining the Hump Ridge Track in the south to 1400m above sea level in the regions' mountains. Its northernmost record is from the Grebe River, near Lake Manapouri. Habitat This species has been observed under ''Astelia ''Astelia'' is a genus of flowering plants in the recently named family Asteliaceae. They are rhizomatous tufted perennials native to various islands in the Pacific, Indian, and South Atlantic Oceans, as well a ...
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Geodorcus Montivagus
''Geodorcus montivagus'' is a large flightless species of stag beetle in the family Lucanidae. It is known from only one female specimen found on the Victoria Range in New Zealand. It was found in tussock at above sea level. Description The specimen found has a body length, including its mandibles of 21.1mm. It has a black and glossy exoskeleton. The mandibles are short, arched and toothed. Conservation This species has been classified as data deficient under the New Zealand Threat Classification System The New Zealand Threat Classification System is used by the Department of Conservation to assess conservation priorities of species in New Zealand. The system was developed because the IUCN Red List, a similar conservation status system, had some ... . References Lucaninae Beetles of New Zealand Endemic fauna of New Zealand Beetles described in 2007 Endemic insects of New Zealand {{Lucanidae-stub ...
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Lucaninae
The Lucaninae comprise the largest subfamily of the stag beetles (Lucanidae). Characteristics include partial to complete division of the eyes by a canthus, geniculate antennae, and distinctly separated coxae. The body is typically elongated and slightly flattened. Genera Some notable species are also listed: * '' Aegognathus'' * '' Aegus'' * '' Agnus'' * '' Allotopus'' * '' Amneidus'' * '' Andinolucanus'' * '' Aphanognathus'' * '' Apterocyclus'' * '' Apterodorcus'' Arrow, 1943 * '' Auxicerus'' * '' Bartolozziolucanus'' * '' Beneshius'' * '' Bomansius'' * '' Brasilucanus'' * '' Cacostomus'' ** '' C. squamosus'' * '' Calcodes'' * '' Cantharolethrus'' ** '' C. luxeri'' * '' Capreolucanus'' * ''Cardanus'' * '' Casignetus'' * '' Charagmophorus'' * '' Chewlucanus'' * '' Chiasognathus'' * '' Cladophyllus'' * '' Cladognathus'' * '' Colophon'' * '' Cyclommatus'' ** '' C. scutellaris'' * '' Dendezia'' * '' Diasomoides'' * '' Dinonigidius'' * '' Dorculus'' * '' Dorcus'' * '' Dynod ...
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Beetles Of New Zealand
Beetles are insects that form the order Coleoptera (), in the superorder Endopterygota. Their front pair of wings are hardened into wing-cases, elytra, distinguishing them from most other insects. The Coleoptera, with about 400,000 described species, is the largest of all orders, constituting almost 40% of described insects and 25% of all known animal life-forms; new species are discovered frequently, with estimates suggesting that there are between 0.9 and 2.1 million total species. Found in almost every habitat except the sea and the polar regions, they interact with their ecosystems in several ways: beetles often feed on plants and fungi, break down animal and plant debris, and eat other invertebrates. Some species are serious agricultural pests, such as the Colorado potato beetle, while others such as Coccinellidae (ladybirds or ladybugs) eat aphids, scale insects, thrips, and other plant-sucking insects that damage crops. Beetles typically have a particularly hard exoske ...
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