Stenoperla prasina

Life-forms

Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Protostomia
Cladus: Ecdysozoa
Cladus: Panarthropoda
Phylum: Arthropoda
Subphylum: Hexapoda
Classis: Insecta
Cladus: Dicondylia
Subclassis: Pterygota
Cladus: Metapterygota
Infraclassis: Neoptera
Supercohort: Polyneoptera
Cohort: Anartioptera
Magnordo: Polyplecoptera
Superordo: Plecopterida
Ordo: Plecoptera
Subordo: Antarctoperlaria

Superfamilia: Eusthenioidea
Familia: Eustheniidae
Subfamilia: Stenoperlinae
Genus: Stenoperla
Species: Stenoperla prasina

Stenoperla prasina is a species of stonefly belonging to the family Eustheniidae.[2] This species is endemic to New Zealand and is classified as "Not Threatened" under the New Zealand Threat Classification System. It is found on the North, South and Stewart Island / Rakiura Islands as well as on Little Barrier Island. Although adults of this species are most often coloured bright green, this species can be coloured yellow. This species inhabits clean, cold, running streams and rivers with stony bottoms within native bush. It is a known indicator of water quality. The larvae eat plant detritus and other aquatic insects while the adult insects feed on sooty mould fungi as well as other plant matter. The adults of this species are a known food source for New Zealand long tailed bats. Adults have been dissected and have been found to have been carrying Nematomorpha and trematode parasites. The New Zealand Department of Conservation classifies this species as "Not Threatened". In 2022 a specimen of this species was the 5 millionth specimen to be digitised in the Natural History Museum, London collection.

Taxonomy

This species was described by Edward Newman in 1845 using a specimen obtained by Mr Saunders and named Chloroperla prasina.[4] Newman noted however that the "species agrees but indifferently with the genus Chloroperla".[4] In 1852 Francis Walker placed this species within the genus Hermes.[3] In 1867 Robert McLaughlan created the genus Stenoperia and placed this species within it.[5] George Hudson discussed and illustrated this species both in his 1892 publication An elementary manual of New Zealand entomology as well as in his 1904 publication New Zealand Neuroptera.[6][7] The holotype specimen of this species is held at the Natural History Museum, London.[8]
Description
Stenoperla prasina nymph

Newman described this species as follows:

Both the antennae are broken, so that their original length and number of joints cannot be ascertained; the remaining joints are nearly equal in length and breadth ; their sutures are very evident ; their colour is faded green. The head is flat, and of a green colour, the eyes being prominent and black ; the ocelli three, and colourless. The prothorax is flat, rather narrower than the head ; its transverse diameter slightly the greatest, its anterior margin nearly straight, posterior rounded, colour green. The fore-wings are glossy, and of a delicate pea-green, the nervures somewhat darker, the hind-wings are more hyaline, but delicately tinted with green, the costal half is glossy. The entire body, legs, and caudal setae appear to have been green, although now faded ; the setae scarcely exceed a fourth of the body in length; they are composed of thirteen joints. Expansion of the wings, 2 inches.[4]

The distinguishing feature of this insect in its nymph stage is the presence of a hair fringe on the dorsal side of the distal segments of the cerci.[8] As this feature is not always present in early instars this can cause issues when attempting to identify this species in its nymph stage.[8] Although by far the majority of specimens are coloured green it is possible for the adults of this species to be coloured yellow.[8]
Distribution

This species is endemic to New Zealand.[9] It is found throughout the three main islands of New Zealand as well as on Little Barrier Island.[8][10]
Habitat

The larvae of this species is commonly found in cold running streams with stony bottoms in native bush.[11]
Behaviour and life history

The female lays up to 75 dark brown eggs each of which is covered by a thick film that dissolves in under a day.[12] The eggs are disbursed at the water surface and then sink to attach to submerged rocks and or detritus.[12] Larvae are found in running streams and rivers throughout the year.[7] The larvae are fast moving and can hide itself from predators amongst stones on the bottoms of the streams in which it lives.[7] When ready to change into an adult insect the larva climbs out of its stream and clings to a plant or rock.[5] Once its exoskeleton has dried its back cracks open and the adult emerges, ready to expand and dry its wings.[7] The adult is on the wing from October to March. Adults of this species can be observed flying at dusk and are attracted to light.[8][10]
Hosts

The larger larvae of this species are known to predate other invertebrates, particular species within the family Ephemeridae, that inhabit streams and river beds.[11][7] Larvae appear to show a preference for species within the Zephlebia genus as well as Ameletopsis perscitus.[7]

Adults of this species feed on sooty mould fungi as well as pollen grains, spores of tree ferns such as Cyathea medullaris and Cyathea smithii, and other plant detritus.[13] Further research is needed to judge the importance of sooty moulds as a food source for S. prasina and also whether it plays a role as a vector assisting honeydew to be eaten by S. prasina.[13]
Predators and parasites

Adults of this species are known to be a food source for the New Zealand long-tailed bat.[14] Adult S. prasina have also been found to be infected with Nematomorpha and trematode parasites.[13]
Conservation status and water quality indicator

S. prasina is classified as "Not Threatened" under the New Zealand Threat Classification System.[1] The presence of nymphs of this species in streams and rivers indicates that the water and habitat is of good quality.[11]
Digitisation milestone
Stenoperla prasina BNHM(E)014418596, the 5 millionth specimen digitised by the Natural History Museum, London.

In 2022 a specimen of this species, collected by George Hudson at Otari-Wilton's bush in 1936, was the 5 millionth specimen to be digitised by the Natural History Museum, London.[15]
References
Wikimedia Commons has media related to Stenoperla prasina.

N. Grainger; J. Harding; T. Drinan; K. Collier; B. Smith; R. Death; T. Makan; J. Rolfe (November 2018). "Conservation status of New Zealand freshwater invertebrates, 2018". New Zealand Threat Classification Series. 28: 20. ISSN 2324-1713. OCLC 1083380599. Wikidata Q76413677.
Gordon, Dennis P., ed. (2010). New Zealand inventory of biodiversity: Kingdom animalia : chaetognatha, ecdysozoa, ichnofossils. Vol. 2. p. 399. ISBN 978-1-877257-93-3. OCLC 973607714. OL 25288394M. Wikidata Q45922947.
G A H Helson (1935). "The Bionomics and Anatomy of Stenoperla Prasina.(Newman)" (PDF). Transactions and Proceedings of the Royal Society of New Zealand. 64: 214–218. ISSN 1176-6166. Wikidata Q89182304.
Edward Newman (1845). "Addendum to the 'Synonymy of the Perlites, by Edward Newman,' published in the Mag. Nat. Hist. for 1839". The Zoologist. 3: 853. Wikidata Q110616294.
Robert McLachlan (1867). "A new Genus of Hemerobidae, and a new Genus of Perlidae". Transactions of the Entomological Society of London. 5: 354. ISSN 2053-2520. Wikidata Q110616780.
Hudson, G. V. (George Vernon) (1892), An elementary manual of New Zealand entomology; being an introduction to the study of our native insects. With 21 coloured plates., London: West, Newman & Co., pp. 106–107, doi:10.5962/BHL.TITLE.8441, LCCN 26003319, OCLC 9606291, Wikidata Q19073630
George Vernon Hudson (1904). "New Zealand Neuroptera : a popular introduction to the life-histories and habits of may-flies, dragon-flies, caddis-flies and allied insects inhabiting New Zealand, including notes on their relation to angling". London: 5–6. doi:10.5962/BHL.TITLE.8516. Wikidata Q44839300.
I. D. McLellan (January 1996). "A revision of Stenoperla (Plecoptera: Eustheniidae) and removal of Australian species to Cosmioperla new genus". New Zealand Journal of Zoology. 23 (2): 176–179. doi:10.1080/03014223.1996.9518076. ISSN 0301-4223. Wikidata Q99974102.
"Stenoperla prasina". nztcs.org.nz. Retrieved 18 January 2022.
Stephen R. Pohe; M. Lyn Wade; Michael J. Winterbourn; Olivier J.-P. Ball (11 February 2019). "Invertebrate fauna of ephemeral streams on Hauturu-o-Toi/Little Barrier Island in northern New Zealand". New Zealand Journal of Zoology. 47 (1): 53–70. doi:10.1080/03014223.2019.1576214. ISSN 0301-4223. Wikidata Q110617284.
"Green stonefly ([Stenoperla])". Manaaki Whenua. Retrieved 19 January 2022.
Brian J. Smith; Richard G. Storey (15 March 2018). "Egg characteristics and oviposition behaviour of the aquatic insect orders Ephemeroptera, Plecoptera and Trichoptera in New Zealand: a review". New Zealand Journal of Zoology. doi:10.1080/03014223.2018.1443473. ISSN 0301-4223. Wikidata Q51172756.
Michael J Winterbourn; Stephen R Pohe (14 July 2016). "Feeding and parasitism of adult Stenoperla spp. (Plecoptera: Eustheniidae) in New Zealand". Austral Entomology. 56 (2): 191–197. doi:10.1111/AEN.12222. ISSN 2052-174X. Wikidata Q110617015.
C. F. J. O'Donnell (March 2001). "Advances in New Zealand mammalogy 1990–2000: Long‐tailed bat". Journal of the Royal Society of New Zealand. 31 (1): 43–57. doi:10.1080/03014223.2001.9517638. ISSN 0303-6758. Wikidata Q60961247.
Ashworth, James (18 January 2022). "Museum digitises five millionth specimen to unlock secrets of collection". Natural History Museum. Retrieved 18 January 2022.