Panarthropoda

"Walking Worms" or "Claw Bearers".

Their body is cylindrical and externally and internally unsegmented, although the nervous and nephridial excretory systems show internal segmental arrangement

"Water Bears" or "Bear Animalcules"
Can enter tun state: the metabolic activities of the organisms are reduced to what seems an impossible level to regulate water los
stylet: on mouth in which plant tissues are pierced and juices are sucked in

1)have the first pair of ventral appendages modified terminally to form opposing claw-like or pincer-like organs termed chelicerae
2)Lack mandible
3) prosomal and opisthosomal tagmata are comparable to what is termed the cehpalothorax and abdomen of the crayfish

1)six pairs of appendages on the abdomen in addition to the six in what is known as the prosomal region
2) respiratory organs are named gill books
3) "Horseshoe Crab"
4) A pair of compound eyes and two medially eyes

Scorpions, Pseudoscorpions, Whip Scorpions, Spiders, Soldier Spiders, Harvestmen, Mites, Ticks,

1)An elongate central trunk (prosoma), enlarged chelate pedipalps, and the segmented tail (opisthosoma) with its terminal "stinger" are the cardinal characteristics for this group
2) prosoma bears the chelicera, pedipalps, and four pairs of walking legs
3)Pectines: 9th segment only found in scorpions/ comb-like used for sensory
4)Telson- gland located on basal bulb that injects toxin

Very small scorpions
Note chelate chelicerae and pedipalps

1)Whip Scorpions
2) Known as Vinegaroons due to the secretions of a defensive or offensive substance from glands in the posterior part of the body with an acetic acid odor like that of vinegar
3) no poison or stinging apparatus and cephalothorax is somewhat narrowly attached to the abdomen

1) True Spiders
2) prosoma is usually the smaller of the two parts, both of which are unsegmented in the adult.
3) The opisthosoma contains the main respiratory, excretory (Malphigian tubules), reproductive, digestive organs,heart, and silk spinning organs
4) The main nerve center is in the prosoma
5) The massive two jointed opposing chelicerae are distinctive

the Crustacea are characterized by a pair of appendages, the "mandibles"

1) a parasitic existence on gills of fresh water and marine fishes
2) The labrium and labium have formed a cone, used for piercing their host and sucking their food.

1) largely freshwater inhabitants
2) The coxa of the thoracic appendages has a flattened epipodite, which is used as a gill
3)Cladocera(water fleas)

1) Fairly shrimp
2) adapted to high salinity and found in large bodies of often temporary salt water

1)The Seed Shrimp

uniramous first antennae are well developed and serve a range of functions in the group-swimming, sensory and mating