Helastia cryptica
Female
Male
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Lepidoptera
Family: Geometridae
Genus: Helastia
Species:
H. cryptica
Binomial name
Helastia cryptica
Craw, 1987[1]

Helastia cryptica is a moth of the family Geometridae.[2] It was first described by Robin C. Craw in 1987. This species is endemic to New Zealand and is found from mid Canterbury south. This preferred habitat of H. cryptica is native forest and scrub at altitudes ranging from lowland to subalpine. It has also been observed in human modified habitat. The larvae of this species has been observed on Melicytus alpinus, likely feeding on perched dead leaves and have been hypothesised as feeding on epiphytic mosses. Adults are nocturnal and are on the wing from November until January. Externally this species is indistinguishable from its close relative H. cymozeucta. However the distribution of these two species can assist in the correct identification of specimens.

Taxonomy

This species was first described by Craw in 1987.[3] The male holotype, collected by Craw near the River Jordan in Paradise, Otago Lakes area, is held in the New Zealand Arthropod Collection.[4]

Description

Observation of H. cryptica.

Craw described this species as follows:

Medium sized (r.f.l.10.4-13 mm) falcate forewing. Upper side fore- and hind wing coloration and pattern very variable ranging from reddish, green and brown to creamy white and blackish brown with wavy transverse black and white lines. Postmedial line with distinct median double toothed projection. Male antennae bipectinated.[3]

The genitalia of the adults of this species make it easily distinguishable from its close relative H. cymozeucta.[3] However Craw stated the two are impossible to distinguish externally.[3] The distribution of the two species can help inform identification as H. cryozeucta is found in the North Island and the upper parts of the South Island while H. cryptica is restricted to Mid Canterbury south.[3]

Distribution

H. cryptica is endemic to New Zealand.[1] It is found only in the South Island in the Mid Canterbury, Mackenzie, Dunedin, Central Otago, Otago Lakes and Fiordland areas.[3]

Habitat and hosts

The preferred habitat of this species is native forest and scrub as well as modified habitat.[3] H. cryptica can be found at altitudes ranging from lowland to subalpine.[3] The larvae of this species have been found on Melicytus alpinus likely feeding on perched dead leaves.[5][6][7] It has also been hypothesised that the larvae of this species feed on epiphytic mosses.[8]

Behaviour

Adults are nocturnal and are on the wing from November until January.[3][9]

References

Wikimedia Commons has media related to Helastia cryptica.
  1. 1 2 "Helastia cryptica Craw, 1987". www.nzor.org.nz. Retrieved 2022-03-01.
  2. ↑ Gordon, Dennis P., ed. (2010). New Zealand inventory of biodiversity: Kingdom animalia : chaetognatha, ecdysozoa, ichnofossils. Vol. 2. p. 459. ISBN 978-1-877257-93-3. OCLC 973607714. OL 25288394M. Wikidata Q45922947.
  3. 1 2 3 4 5 6 7 8 9 R. C. Craw (April 1987). "Revision of the genus Helastia sensu stricto with description of a new genus (Lepidoptera: Geometridae: Larentiinae)". New Zealand Journal of Zoology. 14 (2): 269–293. doi:10.1080/03014223.1987.10422997. ISSN 0301-4223. Wikidata Q54670161.
  4. ↑ John Stewart Dugdale (23 September 1988). "Lepidoptera - annotated catalogue, and keys to family-group taxa". Fauna of New Zealand. Department of Scientific and Industrial Research. 14: 181. doi:10.7931/J2/FNZ.14. ISSN 0111-5383. Wikidata Q45083134.
  5. ↑ Brian H. Patrick (1991). Insects of the Dansey Ecological District (PDF). Vol. 32. pp. 1–25. ISBN 0-478-01285-3. ISSN 0113-3713. Wikidata Q110318301. Archived from the original (PDF) on 30 December 2021. {{cite book}}: |journal= ignored (help)
  6. ↑ Department of Conservation (February 2005). Part 1 Conservation Resources Report. Cluden Station Crown Pastoral Land Tenure Review (Report). p. 76. Archived from the original on 2018-02-05. Retrieved 8 December 2018.
  7. ↑ K. J. M. Dickinson; A. F. Mark; B. I. P. Barratt; B. H. Patrick (March 1998). "Rapid ecological survey, inventory and implementation: a case study from Waikaia Ecological Region, New Zealand". Journal of the Royal Society of New Zealand. 28 (1): 83–156. doi:10.1080/03014223.1998.9517556. ISSN 0303-6758. Wikidata Q54578259.
  8. ↑ "Sherwood Forest species list" (PDF). www.nzpcn.org.nz. 2018. Retrieved 29 April 2023.
  9. ↑ "Helastia cryptica". iNaturalist. Retrieved 2023-04-29.
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