Arthropods of Dogs and Cats
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Arthropods of Dogs and Cats Linguatula serrata Arthropods - Major Groups Insects Body - three divisions Legs – three pairs Arachnids/Acarines Body - Compact Legs – four pairs Dipteran – 2 winged flies Head Eye Thorax Abdomen Dipteran Morphology Antennae in the Diptera Nematocera antennae antennae Nematocera antennae antennae Brachycera antennae Antennae in the Cyclorrhapha Nematocera See Veterinary Parasitology page 145 Dipteran Wing Morphology Cyclorrhapha Wing Pattern Mouthparts for lapping, sucking Mouthparts for lapping, sucking Mouthparts for piercing, sucking Mouthparts for cutting, slashing Direct, Hemimetabolous, Life Cycle or Simple Metamorphosis Direct, Hemimetabolous, Life Cycle or Simple Metamorphosis Indirect, Holometabolous, Life Cycle or Complex Metamorphosis Spiracles in maggots/screwworms Maggots, Screwworms Bots Maggots – Small dark areas at anterior (right) are mouth hooks, and dark circles at posterior (left) are spiracular plates Mouth hooks on a maggot, screwworm Mouth hooks on a bot Spiracular plates on a maggot Spiracular plates on a bot Calliphorids, blow Flies, greenbottle Calliphorids, blow Flies, bluebottle Calliphorids, blow Flies, greenbottle Calliphorids, blow Flies, bluebottle Spiracles in the Sarcophagids Inner slit directed away from the mid line Cochliomyia 3rd stage larvae spiracles Spiracular plates for some Bots and Maggots Cochliomyia hominivorax Cochliomyia 3rd stage larvae Cochliomyia – darkly pigmented tracheal tubes Cochliomyia egg mass near wound Cochliomyia larvae leaving wound Cochliomyia in a cat Trichodectes canis Linognathus setosus Louse nits Louse Nit Lice on Dog Morphological features of an adult flea Heads of fleas – NB pronotal & genal combs Ctenocephalides Ctenocephalides Ctenocephalides-----eggs Head Thorax Antenna Abdomen Large Hairs Anal Struts Morphology of a flea larva Ctenocephalides---larva Ctenocephalides---larva Ctenocephalides larva Ctenocephalides pupa Pre-emerged adult flea Adult exiting out of the cocoon Fleas on a Dog Flea allergy dermatitis Flea Allergy dermatitis Flea dirt Flea dirt Flea dirt, larvae, and eggs Flea eggs and flea dirt Heavy Tick Infections Ixodids or hard ticks, male (left) female (right) (Dermacentor spp.) Argasids or Soft ticks Dorsal view Argasids or Soft ticks Ventral view (Argas sp) Argasids or Soft ticks – Ventral view (Argas) 3-Host Tick Life Cycle 2-Host Tick Life Cycle 1-Host Tick Life Cycle Chelicerae Hypostome Palp Basis Capitulum Capitulum of a tick – ventral view Basis Capitulum Capitulum of a tick – ventral view Capitulum of a tick – dorsal view SEM Ventral view of the capitulum Capitula of various hard ticks Rhipicephalus sanguineus adults, nymph, and larva Rhipicephalus sanguineus nymph, larvae Rhipicephalus sanguineus female inornate scutum Scutum ornate (Dermacentor spp.) Rhipicephalus sanguineus Basis capitulum hexagonal dorsally, short palps, with festoons Rhipicephalus sanguineus capitulum Capitulum parallel sided (Dermacentor) Shor t palp coxasI genita l orifice spiracle anus Rhipicephalus sanguineus with adanal plates Long Mouth parts (Ixodes) With Festoons (Dermacentor) Rhipicephalus also has festoons Rhipicephalus sanguineus life cycle R. sanguineus female and eggs Itch and Mange Mites Position of legs Bloodsucking Mites Position of legs Burrowing Mites Short legs Non-Burrowing Mites Long legs Sarcoptes Sarcoptes Sarcoptes SEM Sarcoptes - dog skin Sarcoptes - dog skin Dermogram Sarcoptic mange Early lesion in Sarcoptic mange Sarcoptic mange or Scabies Sarcoptic mange or Scabies Sarcoptic mange or Scabies Sarcoptic mange or Scabies Sarcoptic mange or Scabies Demodex Demodex Demodex Dermogram - Demodectic mange Demodex - dog skin Demodex - dog skin Demodecosis Demodecosis Demodecosis Demodecosis Demodex - skin scraping Female Otodectes Male Otodectes Otodectes Cheyletiella Cheyletiella Cheyletiella Cheyletiellosis Cheyletiellosis
