Amychus manawatawhi

Amychus manawatawhi, commonly known as the Three Kings click beetle, is a large flightless click beetle in the family Elateridae, found only on the Three Kings Islands of New Zealand.

Three Kings click beetle
Amychus manawatawhi by Joanna Liddiard

Naturally Uncommon (NZ TCS)[1]
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Coleoptera
Family: Elateridae
Genus: Amychus
Species:
A. manawatawhi
Binomial name
Amychus manawatawhi
Marris and Johnson, 2010[2]

Discovery and etymology

This species was named and described by John Marris and Paul J. Johnson in 2010, based on a type specimen collected in 2006 at Lighthouse Bush on Great Island, Three Kings; the holotype was deposited in the Lincoln University Entomology Research Collection (LUNZ).[2][3]

The name manawatawhi is taken from the Māori name for Great Island, Manawa Tawhi, which translates as "panting breath", referring to the feat of Te Aopuri chief Rauru swimming to the island from the mainland.[4]

Description

Adult A. manawatawhi can be distinguished from other Amychus species by its lack of small nodules on the back, especially on the head and elytra, compared to A. granulatus and A. candezei.[2] It is the largest of the three Amychus species, ranging from 16–24 mm. It has a flattened body shape and small vestigial wings.[2] Click beetles are named for their ability to make an audible click when on their back to jump into the air.[5] However, Amychus do not have the ability to defend themselves in this way.[6]

Holotype in Lincoln University Entomology Research Collection
  • Lateral view
  • Frontal
  • Ventral

Distribution

This species has only been collected from Great Island and South West Island in the Three Kings group. These islands have been isolated from the New Zealand mainland since the late Miocene, and have numerous endemic species; it seems likely that A. manawatawhi evolved on the Three Kings and has always been restricted to those islands.[2]

Ecology

The adult beetle has been collected at night from logs and the trunks of tree species such as Cordyline kaspar, Kunzea sinclairii and Meryta sinclairi, and by day from pitfall traps, litter samples, and under logs and rocks. Only a single larva has been collected, from South West Island.[2][7]

Conservation

A. manawatawhi has been classified as "Naturally Uncommon" by the Department of Conservation.[7] Goats were introduced to Great Island in 1889, but removed in 1946.[1]

gollark: Random programming projects!
gollark: Though there are still unencrypted pager messages around here, so who knows...
gollark: One would assume that important military or whatever stuff would be encrypted.
gollark: The somewhat exposed HV wiring around running water seems kind of cursed.
gollark: > Talk of HV and other electronic hazards previously in <#426054145645215756> will be relegated to #danger-high-voltage, which itself will require passing a test to view.

References
  1. Leschen, R. A. B.; Marris, J. W. M.; Emberson, R. M.; Hitchmough, R. A.; Stringer, I. A. N. (2012). "The Conservation Status of New Zealand Coleoptera". New Zealand Entomologist. 35 (2): 91–98. doi:10.1080/00779962.2012.686311.
  2. Marris, John W. M.; Johnson, Paul J. (2010). "A revision of the New Zealand click beetle genus Amychus Pascoe 1876 (Coleoptera: Elateridae: Denticollinae) with a description of a new species from the Three Kings Islands". Zootaxa. 2331: 35–56. Retrieved 2016-05-29.
  3. "Amychus manawatawhi Holotype". Lincoln University Living Heritage: Tikaka Tōku Iho. Retrieved 2019-12-04.
  4. Cheeseman, T.F. (1888) "Notes on the Three Kings Islands." Transactions and Proceedings of the New Zealand Institute: 20, 141–150.
  5. Hall, Grace. "Click Beetle". Landcare Research. Retrieved 2 June 2016.
  6. Ure, Graeme. "Island Refuge". New Zealand Geographic. Retrieved 2 June 2016.
  7. McGuiness, C.A. "The Conservation Requirements of New Zealand's Nationally Threatened Invertebrates" (PDF). Department of Conservation. Retrieved 2016-05-29.
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