Arthropoda Flashcards
Hemocoel
Main body cavity of arthropods
Similarities between Arthropods and Annelida
Metamerism (segmentation)
NS consisting of supraesophageal ganglia, nerves encircling the esophagus, and a ventral series of segmental ganglia
Pygidium
Terminal/hind segment of body
Chelicera
Pair of appendages in front of the mouth, usually modified as pincerlike claws
Palps
Each of elongated segmented appendages near the mouth of an arthropod, usually concerned with the senses of touch and taste
Argulus sp
Branchiuran fish louse
Reduced mouthparts (piercing “proboscis”)
Has suction cups to hold onto the host (ectoparasites)
2 prominent movable compound eyes are visible in head region
4 pairs of thoracic swimming legs
Feed by inserting digestive enzymes into body, then sucking out liquidized host
Symptoms: inflammation, skin ulcer, gill diseases
Treatments: Emamectin benzoate, dimilin, baths
3 subphylums of Arthropoda
- Crustacea (copepods, barnacles & relatives)
- Chelicerata (ticks and mites)
- Atelocerata (flies, bugs, lice, fleas)
Micropredators
Temporary parasite
Can transmit disease and drink our blood
Do not stay on one host for their entire life
Specialized to find a capillary, specialized mouthparts, secrete anticoagulant and anaesthetic
4 families in class copepoda
- Family Lernaediae (anchor worms)
- Family Ergasilidae (gill lice)
- Family Caligidae (sea lice)
- Family Pennellidae
Difference between D. andersoni larva and nymphs
Larva have 3 pairs of legs, nymphs have 4
Sarcoptes scabiei (lab)
Itch mite
Definitive host is humans, and wild/domesticated dogs and cats
Cause mange
Ectoparasites
Demodex follicularum mite
Face mite
Humans are definitive hosts
When found in large number they cause demodicosis
Usually found in human hair follicle
Uniramous appedanges vis biramous appendages
Uni: not branching, only 1 function (subphylum chelicerata)
Bi: branched with 2 functions (1 is locomotion, other is grooming, etc) - crustaceans
Amblyomma americanum
Lone star tick
Diseases: Rocky Mountain Spotted fever, tularemia
3 hosts (larva, nymph, adult) - need 3 blood meals to develop to adult stage
All stages can feed on humans
Rocky Mountain Spotted fever (agent, symptoms, treatment)
Agent: Ricketsia rickettsii
Symptoms: Rash resulting from the leakage of blood vessels, nausea, appetite-loss, fever, myalgia, headache
Treatment: Antibiotics (doxycyline)