Veterinary entomology 208 fall 2010
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Veterinary Entomology 208 Fall 2010. Diptera (True Flies). Diptera (True Flies). Fly taxonomy. Traditional classification : Brachycera (‘short horn’) fat-bodied flies short antennae Examples: horse flies, house flies, etc. Nematocera (‘thread horn’) slender-bodied flies

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Veterinary Entomology 208 Fall 2010

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Veterinary Entomology 208

Fall 2010

Diptera

(True Flies)

Diptera

(True Flies)


Fly taxonomy

Traditional classification:

  • Brachycera(‘short horn’)

    • fat-bodied flies

    • short antennae

    • Examples: horse flies, house flies, etc.

  • Nematocera(‘thread horn’)

    • slender-bodied flies

    • long, slender antennae

    • Examples: gnats, mosquitoes, crane flies


Brachycera

Adults: taxa to know in key

  • Hippoboscidae (keds)

  • Tabanidae (horse flies, deer flies)

    • ‘horse fly’

    • ‘deer fly’

  • Calliphoridae

    • Cochliomyia sp.

    • ‘calliphorid spp.’

  • Muscidae

    • Stomoxys calcitrans (stable fly)

    • Haematobia irritans (horn fly)

    • Musca domestica (house fly)

    • Musca autumnalis (face fly)


Key characters and taxa

Hippoboscidae

  • wings absent

  • tick-like in appearance

www.dkimages.com


Key characters and taxa

Antennae

  • aristate

  • stylate (Tabanidae)


Tabanidae

horse fly

deer fly

(no specimens on exam)


spiracle

bristle row

hypopleuron

Key characters and taxa

Hypopleural bristles

  • present (Calliphoridae)

  • absent (Muscidae)


Calliphoridae

Cochliomyia sp.

calliphorid spp.


Key characters and taxa

Mouthparts

  • piercing

  • sponging (Musca)


palps

palps long

palps short

Stomoxys calcitrans

Haematobia irritans


parafrontal area

intermediately wide

very wide or very narrow

Musca domestica

Musca autumnalis


Brachycera

Larvae: taxa to know in key

  • Oestridae (botflies, cattle grubs)

    • Gasterophilus sp. (horse bots)

    • Hypoderma sp. (cattle grubs)

  • Calliphoridae (blowflies, screwworms)

    • Cochliomyiahominivorax (primary screwworm)

    • ‘calliphorid spp.’ (blowflies)

  • Muscidae (house fly, stable fly, horn fly, face fly)

    • Stomoxys calcitrans (stable fly)

    • Haematobia irritans (horn fly)

    • Musca domestica (house fly)

    • Musca autumnalis (face fly)


larvae shape

large and robust

small and slender

other Brachycera

Oestridae


Oestridae

spines small or absent

heavy spines

Gasterophilus sp.

Hypoderma sp.


slits of posterior spiracles

sinuous (squiggly)

straight

Calliphoridae

Muscidae


Calliphoridae

Posterior tracheal trunks unpigmented, not visible

Posterior tracheal trunks pigmented, visible

Cochliomyia

hominivorax

calliphorid sp.


Muscidae

spiracles proximate, button laterally located

spiracles widely separated, button centrally located

Stomoxys

calcitrans

other Muscidae


Muscidae

spiracle with outer margin dark, ring-like

entire spiracle dark, without well-defined, dark margin

other Muscidae

Musca domestica


Muscidae

15 mm

7 mm

Haematobia irritans

Musca autumnalis


Culicidae adults

Taxa to know in key to adult females

Aedes

Anopheles

Culex

Culiseta

Psorophora

Toxorhynchites


as long as proboscis

short

palp length

other Culicidae

Anopheles


slender and curved ventrad apically

same diameter throughout, straight

proboscis shape

other Culicidae

Toxorhynchites


bristles

spiracular bristles present, post-spiracular bristles present

spiracular bristles present, post spiracular bristles absent

Psorophora

Culiseta


bristles

spiracular bristles absent, post-spiracular bristles present

spiracular bristles absent, post-spiracular bristles absent

Aedes

Culex


bristles


Culicidae larvae

Taxa to know in key to larvae

Aedes

Anopheles

Culex

Culiseta

Psorophora


absent

present

air tube

other Culicidae

Anopheles


air tube pecten

  • comb-like arrangement of setae

  • positioned near base of tube

  • all species included in lab have pecten


basal tuft absent, other tufts present

basal tuft present, other tufts absent

air tube setal tufts

Culesita

Culex


plate complete as a ring around segment

plate not complete as a ring around segment, forming ‘saddle’

anal segment

Aedes

Psorophora


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