Animalia / Mandulibulata / Hexapoda / Diptera / Culicidae / Culiseta / Species

Culiseta inornata:

INDEX - INFORMATION AVAILABLE

The information in subject headings below is of a general nature on mosquitoes, and Culiseta genus. Species specific information is only added where available/appropriate. For this species information has been added in the sections marked *.

GENERAL & REFERENCES

APPEARANCE

LIFE CYCLE

ENVIRONMENT

STATUS

 
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General and References

Alternative Names (Synonyms)

Alternative scientific names for species

 

Common names for species / adults

Culicine Mosquitoes

Names for other life stages

  • Larval stages may be referred to as instars.
  • Pupae may be called Tumblers.

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General Appearance and Characteristics

  • A large grayish-brown mosquito with broad, pale-scaled wings.(D70)
  • Feeds on domestic animals and may cause a considerable annoyance to livestock.(D70)
  • This species does not usually bite humans.(D70)
  • Multiple generation reproduction. (W254.Dec03.WNV7, J300.10.w1)
  • Generally, in favourable conditions, the time required for development of Culicidae - Mosquitoes (Family) varies from about 7 to 16 days. (B24)

Similar Species

--
Sexual Dimorphism --

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Associated Diseases
(Information on this species has been added specifically to support the "West Nile Virus" Wildpro volume.
Information on other diseases for which this species is a vector will be fully researched and added in due course.)

Linked Diseases

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References

Species Author

Suzanne I. Boardman (V.w6)

Species Editor

Debra Bourne (V.w5)

References

B24, B46, B73, B502, B503, B504, B505, D70

ORGANISATIONS
(USA Contacts)

ELECTRONIC LIBRARY
(Further Reading)
Click image for full contents list of ELECTRONIC LIBRARY

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TAXA Group (where information has been collated for an entire group on a modular basis)

Parent Group

Specific Needs Group referenced in Management Techniques

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Population Management / Control

Notes

--

Management Techniques

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Appearance

Egg

Shape

Size

  • --
Colour
  • --
Egg wall

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Larva

GENERAL CULICIDAE INFORMATION

Shape

  • --

Size

  • --
Colour
  • --
Detailed anatomical comments
  • Culicine larvae
    • do not have float (palmate) hairs on abdominal segments. (D70)
    • the respiratory openings (stigmata) are at the tip of a siphon (air tube) which arises from the dorsal aspect of the eight and ninth abdominal segments and surrounds the stigmata. (B24, D70)

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Pupa

Shape

  • --

Size

  • --
Colour
  • --
Detailed anatomical comments
  • --

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Adult

Male characteristics (if different from above)

Shape

  • In Culicine Mosquitoes the resting position of abdomen is pointed towards the resting surface, i.e. the proboscis and abdomen are at an angle, giving a hump-backed appearance. (B24, B503)

Size

  • A large mosquito.(D70)

Colour

  • A grayish-brown mosquito with broad, pale-scaled wings.(D70)

Detailed Anatomical Comments

HEAD
  • In Culicines- the palpi of females are very short, while those of the male are usually as long as the proboscis, not clubbed, long, densely haired, and pointed. (B24, B503, D70)

THORAX

  • In Culicine mosquitoes the scutellum (posterior part of the back of the thorax of the insect) is evenly curved. (B24, B503)

ABDOMEN

  • In Culicines the abdomen is covered with scales which often form characteristic markings. (D70)

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Life Cycle

Egg production and development

  • In some temperate Culicidae - Mosquitoes (Family) species, eggs may over-winter. (B46)
    • Culiseta eggs -
      • laid side by side to form a raft which often contains 100 or more eggs. (D70, B46)
      • the eggs are arranged vertically with their anterior ends towards the water. (B24)
      • eggs remain afloat on the surface of the water until hatching occurs. (D70)
      • usually hatch after a few days. (D70)
Oviposition (place and type of egg-laying)  
Time to hatching
Number of broods
  • --

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Larval Development / Natural Diet / Behaviour

Natural Diet All Culicidae - Mosquitoes (Family) larvae generally strain out small aquatic organisms, algae and particles of plant and animal material as food. (D70)
Physiological Requirements Temperature

Food supplies:

Respiration:

Predation in the wild
  • Fish, insects. (D70)
Behaviour and Activity Patterns
  • young stages of Culicidae - Mosquitoes (Family) can be transferred to new areas by water flowing intermittently. (B24)
  • too much rain can wash away the larvae and decrease the number of Culicidae - Mosquitoes (Family), unless pools remain afterwards. (B24)
  • generally, Culicidae - Mosquitoes (Family) larvae can rest just beneath the surface without effort; certain non-wetting structures suspend the larvae from the water surface film. (D70)
  • Culicidae - Mosquitoes (Family) larvae move in two ways, by:
    • jerks of the body. (D70)
    • propulsion with the mouth brushes. (D70)
  • Culicine mosquitoes generally move by using mouth brushes to "crawl" over the bottom and move slowly on the surface. (D70)
  • Culicine larvae (and other non-Anopheline species):
    • tend to hang head down with only the tip of the air tube penetrating the surface film, suspended from the water surface by the air tube. (B503, D70).
    • feed below surface of the water. (B24)
    • the air tube is closed by the chitinous valves which open when the larva goes to the surface of the water to breath. (B24)

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Pupal Development

  • All Culicidae - Mosquitoes (Family) pupae are aquatic and motile, using paddle-like, oval extensions attached terminally to the abdomen to move up and down in the water. (B46, D70).
  • The pupal stage for Culicidae - Mosquitoes (Family) is usually short: a few hours may be sufficient for certain dry climate species, but more normally ranges from two days in the tropics but can be more than several weeks in temperate regions. (B46, B504, D70)
  • No Culicidae - Mosquitoes (Family) pupa is known to overwinter as a pupa. (D70)
  • The Culicidae - Mosquitoes (Family) pupa release the adult through a hole / split in back (dorsum) of the pupal cuticle (tegument) as the pupal case floats on the surface of the water. The wings are fully expanded and hardened after about 24 hours and the mosquito is then soon able to fly. (B46, B504, D70)
Natural Diet
Physiological Requirements Respiration
Predation in the wild
  • Probably - fish, insects. (D70)
Behaviour and Activity Patterns
  • All Culicidae - Mosquitoes (Family) pupae are motile, using paddle-like, oval extensions attached terminally to the abdomen to move up and down in the water. (B46, D70).
  • Most Culicidae - Mosquitoes (Family) pupae tend to be lighter than water due to an air space between the wing cases on the underside of the cephalothorax. (D70)
  • Culicidae - Mosquitoes (Family) pupae can move about with considerable speed by vigorous movement of the abdomen, tending to rise directly to the surface when movement stops although they tend to be not quite as active as the larvae. (B24, D70)

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Adult Reproduction / Physiology / Natural Diet / Behaviour

  • In the southern United States, breeding is generally restricted to the fall, winter and spring months (B505).
  • In the north, the females pass the winter in hibernation and the immature stages a found mainly in the spring summer and fall months (B505).
  • Multiple generation reproduction. (W254.Dec03.WNV7, J300.10.w1)
Natural Diet
  • Most Culicidae - Mosquitoes (Family) species have a generally preferred group of hosts (e.g. birds, mammals, amphibians), but host preference can vary seasonally and often depends on availability. (V.w55)
  • Female adult Culicidae - Mosquitoes (Family) species of veterinary and medical importance normally feed on blood and many species require a blood feed in order to lay eggs (other species of mosquitoes feed only on plants and these are usually of little interest as disease vectors or pests. B504); the protein is necessary for the maturation of ovaries. This cycle requires two or more days for the female to digest the blood, lay a batch of eggs, then seek another blood meal; the cycle can be repeated many times in a female's life. (B24, B504, D70)
  • When Culicidae - Mosquitoes (Family) females feed, a tube is formed by the proboscis and the stylets penetrate the skin of the animal and form a small duct through which saliva is injected into the wound; they also act as a canal through which liquid food is ingested. (B46, D70)
  • Adult Culicidae - Mosquitoes (Family) can be fed on fruit juices and sugar water, and males normally feed on a similar diet in the wild. (B24)
  • Adult male Culicidae - Mosquitoes (Family) (and occasionally the females) feed on nectar and other plant juices. (B24, B503)
  • female adult Culicidae - Mosquitoes (Family) can bite through clothing. (B46)
Predation in the wild --
Reproduction and Life-span
Behaviour and Activity Patterns
  • Feeds on domestic animals.(D70)
  • This species does not usually bite humans.(D70)
  • The females are seldom persistent biters but do occasionally attack man (B505).
  • It has been stated that the females seem to prefer feeding on larger mammals and are at times very troublesome to to livestock in timbered areas (B505).
  • Precipitin tests are reported to demonstrate that females feed principally on larger mammals such as horses and cows and rarely on man (B505).
  • Adults are readily attracted to artificial light and are often captured in light traps during cold wether when few other night-flying insects are active (B505).
  • Copulation of males and females of this species was observed at the edge of a ground pool, where approximately 25 pairs were united by the tips of their abdomens and were resting on the branch of a fallen tree (B505).
  • The feeding behaviour of the female adult Culicidae - Mosquitoes (Family) may cause great nuisance to their host species and bites can be painful and may become secondarily infected. (B24, B46, V.w6)
  • Female adult Culicidae - Mosquitoes (Family) tend to hide in dark corners (hollow trees, culverts etc.) during the day and may use these as hibernacula. (B24, B46, B503)
  • female Culicidae - Mosquitoes (Family) tend to live longer and travel greater distances than the male. (D70)
  • Female adult Culicidae - Mosquitoes (Family) seem to be attracted by skin warmth. (B24)
  • Female adult Culicidae - Mosquitoes (Family) are usually active at night (nocturnal feeders), in twilight hours or in dense shade, although some species may feed entirely during the day. (B24, B46, B503, D70)
  • Adult Culicidae - Mosquitoes (Family) may fly fair distances, varying between different species, and may be carried by the wind, or travel in a number of stages. They can also travel in vehicles. (B24)
Detailed Physiological Comments
  • the antennae of Culicidae - Mosquitoes (Family) are believed to to used for hearing and smelling. (D70)
  • Two small knobbed structures (halteres) vibrate rapidly whilst the mosquito is in flight and serve as organs of equilibrium. (D70)

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Environment

General Habitat type (Biogeographical / Climate Type)

  • The larvae of this species are found in ground pools, ditches, and occasionally in artificial water containers, often grossly polluted (B505).
  • The larvae also occur in the brackish water in coastal marshes (B505).
Typical USA Mosquito Habitats

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Microhabitat (Egg, Larvae, Pupae, Adult)

Egg Temperature

Humidity

Larva
  • The larvae are found in fresh and brackish water (B505).
  • All Culicidae - Mosquitoes (Family) larvae live in water. (D70)
  • Development of the eggs, larvae and pupae of all Culicidae - Mosquitoes (Family) species require water. (D70)
  • Vegetation is important for the development of larval Culicidae - Mosquitoes (Family). (D70)
  • Habitats of larval Culicidae - Mosquitoes (Family) vary greatly between species and may include small temporary collections of water (puddles etc.) to marshes. The larvae are rarely found in fast-flowing streams or rivers, or large uninterrupted waterbodies such as lakes. (B46)
    • Anopheles larvae occur mainly in ground pools, and places where there is a lot of vegetation. (B503)
    • Aedes and Psorophora species breed mainly in woodland pools and salt marshes. (B503)
    • Culex larvae are found mainly artificial containers. (B503)
    • Aedes aegypti breeds primarily in and around human habitations. (D70)
  • All Culicidae - Mosquitoes (Family) larvae live in water, permanent ponds and marshes, temporary flood waters or woodland pools, water contained in tree holes, leaves of plants, or artificial containers. (D70)
  • Culicidae - Mosquitoes (Family) larvae are not usually found in flowing streams and the open waters of large streams, lakes and seas. (D70)

Light:

Pupa
Adult
  • In the north, the females pass the winter in hibernation  (B505).
  • Hibernation / aestivation sites of Culicidae - Mosquitoes (Family) females are usually relatively dark conditions with an even temperature, such as cellars, barns and lofts under thatched roofs. (B24)

Light:

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Geographical Distribution, Migration etc.

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Status

Intra-specific variation (subspeciation)

 

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Conservation / Pest / Legal Status

  • May cause a considerable annoyance to livestock.(D70)
  • The feeding behaviour of the female adult Culicidae - Mosquitoes (Family) may cause great nuisance to their host species and bites can be painful and may become secondarily infected. (B24, B46, V.w6)

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