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  • Larvae with obvious spines or processes on each segment

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    Larvae without obvious spines or processes (smooth) on each segment

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    • Larvae robust & rounded at both ends

      Rudimentary mouth hooks

      Found in skin of cattle

      Very small spines present

      (NOT IN AUSTRALIA)

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      Hypoderma sp

      Larvae slender

      Pointed anteriorly & tapering to a larger posterior part

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    • Posterior spiracles sunken and often completely hidden in rounded cavity

      Slit nearly vertical (not directed towards opening)

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      Sarcophaga sp

      Posterior spiracle not sunken

      Slit never vertical (directed toward opening)

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    • Slit in posterior spiracle straight

      Calliphoridae

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      slit sinuous

      Musca sp

    • Peritreme broken

      Chrysomya sp

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      Peritreme entire

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    • Peritreme thick

      Accessory sclerite between mouth hooks (can't see in whole maggots)

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      Calliphora sp

      Peritreme thin

      No accessory sclerite

      Lucilia sp

  • Spines on ventral surface only

    Mouth hooks well developed

    Inner margin of spiracles scalloped

    Found in sheep nasal sinuses

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    Oestrus ovis

    Spines encirling body

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  • Fleshy processes on dorsal & lateral aspects, few on ventral surface

    Rows of small spines on first 2 or 3 anterior segments thereafter spines on central aspects

    Larvae slender and pointed anteriorly

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    Chrysomya rufifacies

    No fleshy processes

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  • Densely covered with small black spines which form bands at posterior margins of segments

    Spiracle slit straight

    Larvae slender

    (NOT IN AUSTRALIA)

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    Chrysomya bezziana

    1 or 2 rows of flat spines on the anterior margon of most segments

    Larvae with 3 triangular anterior segments and remainder of larvae with parallel sides

    Robust

     

     

     

     

     

     

     

    [Gasterophilus sp]
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  • One row of spines on each segment

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    Gasterophilus nasalis

    Two rows of spines on each segment

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  • Mouth hook with saddle-like depression

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    Gasterophilus intestinalis

    Mouth hooks uniformly bent

    Ventral side of segment 3 with 1 interrupted row of spines

    Gasterophilus haemorrhoidalis

  • Slit in posterior spiracle straight

    Calliphoridae

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    Slit sinuous

    Musca sp

  • Peritreme broken

     

     

    [Chrysomya sp]

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    Peritreme entire

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  • Peritreme thick

    Accessory sclerite between mouth hooks (can't see in whole maggots)

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    Calliphora sp

    Peritreme thin

    No accessory sclerite

    Lucilia sp

  • Anterior spiracles with 4 - 6 lobes

     

     


    Old World Screw Worm Fly
    Not in Australia
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    Chrysomya bezziana

    Anterior spiracles with >10 lobes

    Chrysomya sp