Plecoptera

The Plecoptera are an order of insects, commonly known as stoneflies. Some 3,500 species are described worldwide,[1] with new species still being discovered. Stoneflies are found worldwide, except Antarctica.[2] Stoneflies are believed to be one of the most primitive groups of Neoptera, with close relatives identified from the Carboniferous and Lower Permian geological periods, while true stoneflies are known from fossils only a bit younger. The modern diversity, however, apparently is of Mesozoic origin.[3]

Plecoptera are found in both the Southern and Northern Hemispheres, and the populations are quite distinct, although the evolutionary evidence suggests species may have crossed the equator on a number of occasions before once again becoming geographically isolated.[3][4]

All species of Plecoptera are intolerant of water pollution, and their presence in a stream or still water is usually an indicator of good or excellent water quality.[5]

Plecoptera
Temporal range: 299–0 Ma
Permian–Recent
Eusthenia sp
Eusthenia sp.
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Superorder: Exopterygota
Order: Plecoptera
Burmeister, 1839
Suborders

Arctoperlaria
and see text

Description and ecology

SteinfliegenLarve2
Nymph of a golden stonefly, Plecoptera, Perlidae
Stonefly - dinotoperla
Dinotoperla imago (adult)
(Gripopterygidae: Dinotoperlinae)

Stoneflies have a generalized anatomy, with few specialized features compared to other insects. They have simple mouthparts with chewing mandibles, long, multiple-segmented antennae, large compound eyes, and two or three ocelli. The legs are robust, with each ending in two claws. The abdomen is relatively soft, and may include remnants of the nymphal gills even in the adult. Both nymphs and adults have long, paired cerci projecting from the tip of their abdomens.[6]

The name "Plecoptera" literally means "braided-wings", from the Ancient Greek plekein (πλέκειν, "to braid") and pteryx (πτέρυξ, "wing").[7] This refers to the complex venation of their two pairs of wings, which are membranous and fold flat over their backs. Stoneflies are generally not strong fliers, and some species are entirely wingless.

A few wingless species, such as the Lake Tahoe benthic stonefly ("Capnia" lacustra[Note 1]) or Baikaloperla, are the only known insects, perhaps with the exception of Halobates, that are exclusively aquatic from birth to death.[9] Some true water bugs (Nepomorpha) may also be fully aquatic for their entire lives, but can leave the water to travel.

The nymphs (technically, "naiads") are aquatic and live in the benthic zone of well-oxygenated lakes and streams. A few species found in New Zealand and nearby islands have terrestrial nymphs, but even these inhabit only very moist environments. The nymphs physically resemble wingless adults, but often have external gills, which may be present on almost any part of the body. Nymphs can acquire oxygen via diffusing through the exoskeleton, or through gills located on behind the head, on the thorax, or around the anus.[10] Due to their nymph's requirement for well oxygenated water, the species is very sensitive to water pollution. This makes them important indicators for water quality.[11] Most species are herbivorous as nymphs, feeding on submerged leaves and benthic algae, but many are hunters of other aquatic arthropods.[6]

Life cycle

The female can lay up to one thousand eggs. It will fly over the water and drop the eggs in the water. It also may hang on a rock or branch. Eggs are covered in a sticky coating which allows them to adhere to rocks without being swept away by swifting moving currents.[12] The eggs typically take two to three weeks to hatch, but some species undergo diapause, with the eggs remaining dormant throughout a dry season, and hatching only when conditions are suitable.[6]

The insects remain in the nymphal form for one to four years, depending on species, and undergo from 12 to 36 molts before emerging and becoming terrestrial as adults.[13] Before becoming adults, nymphs will leave the water, attach to a fixed surface and molt one last time.

The adults generally only survive for a few weeks, and emerge only during specific times of the year when resources are optimal. Some do not feed at all, but those that do are herbivorous.[6] Adults are not strong fliers and generally stay near the stream or lake they hatched from.[12]

Systematics

Traditionally, the stoneflies were divided into two suborders, the "Antarctoperlaria" (or "Archiperlaria") and the Arctoperlaria. However, the former simply consists of the two most basal superfamilies of stoneflies, which do not seem to be each other's closest relatives. Thus, the "Antarctoperlaria" are not considered a natural group (despite some claims to the contrary).[14]

The Arctoperlaria, though, have been divided into two infraorders, the Euholognatha (or Filipalpia) and the Systellognatha (also called Setipalpia or Subulipalpia). This corresponds to the phylogeny with one exception: the Scopuridae must be considered a basal family in the Arctoperlaria, not assignable to any of the infraorders. Alternatively, the Scopuridae were placed in an unranked clade "Holognatha" together with the Euholognatha (meaning roughly "advanced Holognatha"), but the Scopuridae do not appear significantly closer to the Euholognatha than to the Systellognatha.

In addition, not adopting the clades Antarctoperlaria and Holognatha allows for a systematic layout of the Plecoptera that adequately reproduces phylogeny, while retaining the traditional ranked taxa.[3][15]

Plecoptera-taeniopterygidae
Adult of family Taeniopterygidae (Euholognatha)
Plecoptera-perlidae1-sp
Adult of family Perlidae (Systellognatha)

Basal lineages ("Antarctoperlaria")

Suborder Arctoperlaria

  • Basal family Scopuridae
  • Infraorder Euholognatha
  • Infraorder Systellognatha

Notes

  1. ^ The genus Capnia is not monophyletic and this species is suspected to belong elsewhere.[8]

References

  1. ^ Romolo Fochetti & José Manuel Tierno de Figueroa (2008). "Global diversity of stoneflies (Plecoptera; Insecta) in freshwater". In E. V. Balian; C. Lévêque; H. Segers; K. Martens (eds.). Freshwater Animal Diversity Assessment. Hydrobiologia. 595. pp. 265–377. doi:10.1007/978-1-4020-8259-7_39. ISBN 978-1-4020-8258-0.
  2. ^ Brittain, 1987
  3. ^ a b c Peter Zwick (2000). "Phylogenetic system and zoogeography of the Plecoptera". Annual Review of Entomology. 45: 709–746. doi:10.1146/annurev.ento.45.1.709.
  4. ^ H. B. N. Hynes (1993). Adults and Nymphs of British Stoneflies. Freshwater Biological Association. ISBN 978-0-900386-28-2.
  5. ^ Nelson, Riley. "Clean water has bugs in it, says BYU Biology Professor Riley Nelson". Retrieved 16 May 2013.
  6. ^ a b c d Hoell, H.V., Doyen, J.T. & Purcell, A.H. (1998). Introduction to Insect Biology and Diversity, 2nd ed. Oxford University Press. pp. 383–386. ISBN 978-0-19-510033-4.CS1 maint: Multiple names: authors list (link)
  7. ^ S. C. Woodhouse (1910). English-Greek Dictionary - a Vocabulary of the Attic Language. London: George Routledge & Sons.
  8. ^ C. Riley Nelson (January 1, 1996). "Capniidae. Winter Stoneflies". Tree of Life Web Project. Retrieved July 31, 2008.
  9. ^ E. M. Holst (2000). "Lake Tahoe benthic stonefly (Capnia lacustra)" (PDF). In D. D. Murhy; C. M. Knopp (eds.). Lake Tahoe Watershed Assessment (PDF). United States Department of Agriculture. pp. O–118 – O–120.
  10. ^ "ENT 425 | General Entomology | Resource Library | Compendium [plecoptera]". www.cals.ncsu.edu. Retrieved 2016-02-23.
  11. ^ "Plecoptera - Stoneflies -- Discover Life". www.discoverlife.org. Retrieved 2016-02-23.
  12. ^ a b "ENT 425 | General Entomology | Resource Library | Compendium [plecoptera]". www.cals.ncsu.edu. Retrieved 2016-04-12.
  13. ^ "Order Plecoptera - Stoneflies - BugGuide.Net". bugguide.net. Retrieved 2016-04-12.
  14. ^ C. Riley Nelson (January 1, 1996). "Plecoptera. Stoneflies". Tree of Life Web Project. Retrieved July 31, 2008.
  15. ^ Nelson (1996b)

External links

Media related to Plecoptera at Wikimedia Commons Data related to Plecoptera at Wikispecies

Arctoperlaria

Arctoperlaria is a suborder of stoneflies.

Capniidae

The Capniidae, the small winter stoneflies, are a family of insects in the stonefly order (Plecoptera). It constitutes one of the largest stonefly families, containing some 300 species distributed throughout the holarctic. Their closest relatives are the rolled-winged stoneflies (Leuctridae).Many species are endemic to small ranges, perhaps due to the family's tendency to evolve tolerance for cold (isolating populations in mountain valleys) and winglessness (inhibiting dispersal). Indeed, some wingless Capniidae – e.g. the Lake Tahoe benthic stonefly ("Capnia" lacustra, Capnia is not monophyletic and this species is suspected to belong elsewhere) or Baikaloperla spp. – spend their entire lifecycles under water and do not disperse from their native lakes at all.

Chloroperlidae

The Chloroperlidae are a family of stoneflies, commonly known as green stoneflies, with more than 180 species in 15 genera. They appear green to yellow in color.

Eumetabola

Eumetabola is an unranked category of Neoptera. Two large unities known as the Paurometabola and Eumetabola are probably from the adelphotaxa of the Neoptera after exclusion of the Plecoptera. The monophyly of these unities appears to be weakly justified.

Eusthenia

Eusthenia is a genus of insect in the family Eustheniidae containing a number of species of stonefly most native to Tasmania. It contains the following species: E. brachyptera is considered a subspecies of E. venosa and Eusthenia extensa or Eusthenia purpurescens are considered E. costalis.

Eusthenia costalis TAS

Eusthenia lacustris TAS

Eusthenia nothofagi (Otway stonefly) VIC

Eusthenia reticulata TAS

Eusthenia spectabilis TAS

Eusthenia venosa ACT NSW VIC

Eustheniidae

Eustheniidae is a family of insects in the order Plecoptera, the stoneflies. They are native to Australia, New Zealand, and Chile.The nymphs live in lakes and in swift-flowing rivers and streams, where they cling to rocks. They are carnivorous. They take two to three years to develop into adults.Genera include:

Cosmioperla McLellan, 1996

Eusthenia Westwood, 1832

Neuroperla Illies, 1960

Neuroperlopsis Illies, 1960

Stenoperla McLachlan, 1867

Thaumatoperla Tillyard, 1921

† Boreoperlidium Sinitshenkova, 2013

† Stenoperlidium Tillyard, 1935

Leuctridae

The Leuctridae are a family of stoneflies. They are known commonly as rolled-winged stoneflies and needleflies. This family contains at least 390 species.

Nemouridae

The Nemouridae are a family of stoneflies containing more than 700 described species, occurring primarily in the Holarctic region. Members of this family are commonly known as spring stoneflies or brown stoneflies. Fly fishermen often refer to these insects as tiny winter blacks.

Although these insects use a wide range of flowing-water habitats, they tend to be most prevalent in smaller streams. The nymphs are distinctive, being broad-bodied and bristly with divergent wing pads.

Neoptera

Neoptera (from New Latin neo "new" and ptera "wing") is a classification group that includes most parts of the winged insects, specifically those that can flex their wings over their abdomens. This is in contrast with the more basal orders of winged insects (the "Palaeoptera" assemblage), which are unable to flex their wings in this way.

Nymph (biology)

In biology, a nymph is the immature form of some invertebrates, particularly insects, which undergoes gradual metamorphosis (hemimetabolism) before reaching its adult stage. Unlike a typical larva, a nymph's overall form already resembles that of the adult, except for a lack of wings (in winged species). In addition, while a nymph moults it never enters a pupal stage. Instead, the final moult results in an adult insect. Nymphs undergo multiple stages of development called instars.

This is the case, for example, in Orthoptera (crickets and grasshoppers), Hemiptera (cicadas, shield bugs, etc.), mayflies, termites, cockroaches, mantises, stoneflies and Odonata (dragonflies and damselflies).Nymphs of aquatic insects, as in the Odonata, Ephemeroptera, and Plecoptera, are also called naiads, an Ancient Greek name for mythological water nymphs. In older literature, these were sometimes referred to as the heterometabolous insects, as their adult and immature stages live in different environments (terrestrial vs. aquatic).

Orthopterida

The Orthopterida is a superorder of the Polyneoptera that represents the extant orders Orthoptera (grasshoppers, crickets, and katydids), and Phasmatodea (stick insects and leaf insects). The Orthopterida also includes the extinct orders Titanoptera and Caloneurodea. There is general consensus of monophyly in this superorder, based on reduction of the second valvulae, an ovipositor derived from the gonoplac, and an enlarged precostal region on the forewing.

The two other superorders of the Polyneoptera are the Plecopterida, which represents the orders Plecoptera (stoneflies), Emboidea (Embioptera/Embiidina; webspinners), and Zoraptera (angel insects), and the Dictyoptera, which represents Blattodea (cockroaches & termites), and Mantodea (mantids). Two other orders, the Notoptera (ice-crawlers and gladiators) and Dermaptera (earwigs) are also placed in the Polyneoptera but outside the superorders discussed above.

Peltoperlidae

The Peltoperlidae, also known as roach-like stoneflies or roachflies, are a family of stoneflies.

The family Peltoperlidae comprises 11 genera and 46 known species. Species are semivoltine, meaning their lifecycles last 1 to 2 years. Adults of the family usually emerge in late spring or early summer, April through June. Larvae are flattened and brown in color, and they are roach-like in appearance because of the expanded thoracic plates covering the bases of their legs, heads, and abdomens. Tapering gills occur on the thorax at the bases of the legs. These tracheal gills are multifunctional and key to many biological processes. No dense tufts or branching gills are found on their thoraces or abdomens, unlike other Plecoptera families. The larvae also possess broad, chisel-like mandibles. Adults have two ocelli in addition to its two compound eyes. Male epiprocts are sclerotized and rod-like in shape, and both genders lack cross-veins in the anal lobe of the forewings.Peltoperlidae are generally lotic erosional and depositional. These habitats are flowing streams marked by sediments, vascular plants, and detritus. Roach-like stoneflies are generally found in leaf litter and debris piles trapped in either riffles or pools.

This family is considered to be clingers-sprawlers; they attach to surface in erosional habitats or rest loosely on the top surfaces of substrates, respectively. The body of this stonefly is flattened and streamlined to aid in minimizing water resistance in a flowing stream.

The Peltoperlidae are classified as in the feeding group shredders-detritivores. They chew and mine through leaf litter in their habitats. They are a significant contributor to leaf breakdown in streams. This family is very sensitive to disturbances in environmental conditions. They are intolerant to loss of coarse particulate organic matter for food and habitat. Given this low tolerance, Peltoperlids make potential bioindicators.

Perlidae

The Perlidae are a family of stoneflies, with more than 50 genera and 1,100 described species. The majority of the Perlidae are found in eastern North America, but they occur worldwide except for Antarctica and parts of Africa. Their lifecycles range between one and three years. They adults emerge in the summer; they are very active and known to be attracted to light sources. They are usually very sensitive to changes in environment.Perlidae are usually lotic and lentic erosional. They are found in cool, clear medium-sized to large streams and sometimes in larger, warm rivers that carry silt. They are crawlers and can move quickly. In still water, no water moves over their gills, so they move their bodies up and down to keep oxygen flowing over them.

They are engulfer-predators. They consume all types of invertebrates. Very young larvae are collector-gatherers.

Perlodidae

The Perlodidae, also known as the perlodid stoneflies, stripetails, or springflies, are a family of stoneflies.

Plecoptera (moth)

Plecoptera is a genus of moths of the family Erebidae. It was described by Achille Guenée in 1852.

Plecoptera quaesita

Plecoptera quaesita is a species of moth of the family Noctuidae. It is found in India, Sri Lanka, Burma, Andamans, Borneo, Northern Moluccas and Australia.

Pteronarcyidae

The Pteronarcyidae, also known as giant stoneflies or salmonflies, are a family of the order Plecoptera.

Pterygota

The Pterygota are a subclass of insects that includes the winged insects. It also includes insect orders that are secondarily wingless (that is, insect groups whose ancestors once had wings but that have lost them as a result of subsequent evolution).The pterygotan group comprises almost all insects. The insect orders not included are the Archaeognatha (jumping bristletails) and the Zygentoma (silverfishes and firebrats), two primitively wingless insect orders. Also not included are the three orders no longer considered to be insects: Protura, Collembola, and Diplura.

Taeniopterygidae

Taeniopterygidae are a family of stone flies with about 110 described extant species. They are commonly called willowflies or winter stoneflies and have a holarctic distribution. Adults are usually smaller than 15 mm.

Insect orders
Extant Plecoptera families

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