''Samana acutata'' is a species of

moth Moths are a group of insects that includes all members of the order Lepidoptera that are not Butterfly, butterflies. They were previously classified as suborder Heterocera, but the group is Paraphyly, paraphyletic with respect to butterflies (s ...

in the family

Geometridae The geometer moths are moth Moths are a group of insects that includes all members of the order Lepidoptera that are not Butterfly, butterflies. They were previously classified as suborder Heterocera, but the group is Paraphyly, paraphyleti ...

This species is

endemic Endemism is the state of a species being found only in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also foun ...

New Zealand New Zealand () is an island country in the southwestern Pacific Ocean. It consists of two main landmasses—the North Island () and the South Island ()—and List of islands of New Zealand, over 600 smaller islands. It is the List of isla ...

. It is classified as "At Risk, Relict" by the

Department of Conservation Department may refer to: * Departmentalization, division of a larger organization into parts with specific responsibility Government and military *Department (administrative division), a geographical and administrative division within a country, ...

Taxonomy

This species was first described by

Arthur Gardiner Butler Arthur Gardiner Butler F.L.S., F.Z.S. (27 June 1844 – 28 May 1925) was an English entomologist, arachnologist and ornithologist. He worked at the British Museum on the taxonomy of birds, insects, and spiders. Biography Arthur Gardiner B ...

in 1877 using a specimen that was collected from

Christchurch Christchurch (; ) is the largest city in the South Island and the List of cities in New Zealand, second-largest city by urban area population in New Zealand. Christchurch has an urban population of , and a metropolitan population of over hal ...

, in the

South Island The South Island ( , 'the waters of Pounamu, Greenstone') is the largest of the three major islands of New Zealand by surface area, the others being the smaller but more populous North Island and Stewart Island. It is bordered to the north by ...

and was obtained from J. D. Enys.

George Hudson George Hudson (probably 10 March 1800 – 14 December 1871) was an English railway financier and politician who, because he controlled a significant part of the Railway Mania, railway network in the 1840s, became known as "The Railway King"—a ...

discussed this species in his 1898 book ''New Zealand moths and butterflies (Macro-lepidoptera).'' He later discussed and illustrated this species in his 1928 book ''The Butterflies and Moths of New Zealand''. The

holotype A holotype (Latin: ''holotypus'') is a single physical example (or illustration) of an organism used when the species (or lower-ranked taxon) was formally described. It is either the single such physical example (or illustration) or one of s ...

specimen is held at the

Natural History Museum, London The Natural History Museum in London is a museum that exhibits a vast range of specimens from various segments of natural history. It is one of three major museums on Exhibition Road in South Kensington, the others being the Science Museum (Lo ...

Description

Butler described the species as follows:

Distribution

This species is endemic to New Zealand. ''S. acutata'' can be found in

Mid Canterbury Mid Canterbury (also spelt Mid-Canterbury and mid-Canterbury) is a traditional, semi-official subregion of New Zealand's Canterbury Region extending inland from the Pacific coast to the Southern Alps. It is one of four traditional sub-regions o ...

and

Central Otago Central Otago is an area located in the inland part of the Otago region in the South Island of New Zealand. The motto for the area is "A World of Difference". The area is dominated by mountain ranges and the upper reaches of the Clutha River ...

. It is now extinct at its type locality.

Life cycle and behaviour

Larvae of this species have been found in January and in March. The adult is on the wing in September and October. Hudson stated this species is attracted to light.

Host species and habitat

The host species for this moth are the New Zealand native brooms in the genus ''

Carmichaelia ''Carmichaelia'' (New Zealand brooms) is a genus of 24 plant species belonging to Fabaceae, the legume family. All but one species are native to New Zealand; the exception, '' Carmichaelia exsul'', is native to Lord Howe Island and presumably dis ...

'' including '' Carmichaelia australis'' and ''

Carmichaelia appressa ''Carmichaelia appressa'' (common name prostrate broom) is a species of pea in the family Fabaceae. It is found only in the South Island of New Zealand. Its conservation status (2018) is "At Risk - Naturally Uncommon" under the New Zealand Thr ...

''. The species is known to inhabit dune ecosystems. It has also been found in habitat containing

gorse ''Ulex'' (commonly known as gorse, furze, or whin) is a genus of flowering plants in the family Fabaceae. The genus comprises about 20 species of thorny evergreen shrubs in the subfamily Faboideae of the pea family Fabaceae. The species are na ...

and

mānuka Mānuka (; ''Leptospermum scoparium'') is a species of flowering plant in the myrtle family (biology), family Myrtaceae, native to New Zealand (including the Chatham Islands) and south-east Australia. Bees produce mānuka honey from its necta ...

Conservation status

This moth is classified 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 s ...

as being "At Risk, Relict". This species is threatened as a result of change of habitat, in particular the loss of its host species due to farming and urban development. It is also at risk from weed invasion from plants such as sea spurge.

References

{{Taxonbar, from=Q13541679 Moths of New Zealand Endemic fauna of New Zealand Moths described in 1877 Geometridae Endangered biota of New Zealand Taxa named by Arthur Gardiner Butler Endemic moths of New Zealand