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Phillip Zook

on 1 May 2010

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Invertebrate Zoology Clade Panarthropoda (Arthropoda + Sister-groups) Arthropoda, Tardigrades, and Onychophorans ...the first arthropods arose in Precambrian seas 600+mya,
by early Cambrian already "true" crustaceans Phylum Onychophora part of explosive marine divers. of Early Cambrian
at some point invaded land, probably during Ordovician period
segmented like annelids and arthropods...'missing link' between two
found in humid areas
antennae, single pair jaws, fleshy oral papillae "slime papillae"
simple lobopodal walking sacs or legs
no isolated band musculature, no compound eyes, no jointed legs
coelem reduced as hemocoel
thin chitinous cuticle (molt like arth)
not calcified though, permeable,
flexible, no plates or sclerites
under cuticle epi. is thin
then connective tissue dermis
then muscles, every which way
true coelem, like arth. is restricted to gonadal cavities
hemoceol is arth-like, partisioned into sinuses
terminal claws on feet, no intrinsic musculature, hemoc. fluid-filled
moves by leg mechanics + hydrostatic forces from hemocoel
slime entangles small invertebrate prey, jaws grasp and cut prey
salivary secretions pass into prey and start digesting, suck into mouth
mouth, pharynx, esophagus, straight intestine, anus
gas exchange through tracheae, supply immidiate area only
ladder-like nervous system
no malpighian tubules
first ecdysis - hormone mediated molting for growth blood, lymph, etc. between organs
of open-circ. organisms Velvet Worms Phylum Tardigrada Water Bears 8 legs
really durable eggs, cysts, and tuns
can be carried by wind, animals, etc.
semi-aquatic and aquatic freshwater and marine
amazing anabiosis - reduced metab. during times of bad environment
cryptobiosis - extreme, basically seem dead on the exterior
somewhat lobopodal legs, but DO have intrinsic musculature
alternate also to tun and cyst stages of lower activity
body is covered by a thin, uncalcified cuticle that is molted
greatly reduced coelem, main body hemocoel, true only gonadal cavities
muscles in separate bands, with subcuticular attachment like arthropods
malpighian tubules present probably ectodermally derived
legs not jointed
no compound eyes
muscles isolated as bands to some degree
motion is less dependent on hydrostatic pressure and more on antagonistic sets of muscles
uses claws for traction, step-by-step gait
feed on fluid of animal or plant cells by puncture w/ oral stylets
others eat other stuff with mouth modifications, carnivores, detritivores, etc.
rely on direct diffusion through body wall for gas exchange
large, lobed cerebral ganglion and nerve cords, sensory bristles as well
some dioecious, some hermaphrodites, some no males

A tubule that extends from the alimentary canal to the exterior of the organism, excreting water and wastes in the form of solid nitrogenous compounds. Found in certain insects, arachnids, myriapods and tardigrades. Phylum Arthropoda Subphyla Trilobitomorpha Subphyla Crustacea Subphyla Hexapoda Subphyla Myriapoda Subphyla Checliceriformes bilateral, triploblastic, protostomes
segmented both internally and externally
cuticle forms well-developed exoskeleton
exoskeleton of chitin, protein, and varying calcification
without collagen. is secreted by epidermis
some have compound eyes
coelem reduced to portions of reproductive and excretory systems (main body cavity is an open hemocoel (=mixocoel))
open circ. system
gut complete and complex
annelid-like nervous system, cerebral ganglia and nerve cords
growth by ecdysone-mediated molting
muscles metamerically arranged, striated, and grouped in isolated bands
most dioecious
circular muscles of annelids lost almost entirely
basically first heart because don't have those external muscles to pump blood around with
surface sense organs "setae"
internal excretory organs
invaded land and freshwater regions
tagmosis - regional specialization within body, regions called tagmata
cephalon, thorax, and pygidium (abdomen) cephalon, thorax, abdomen
crabs, lobsters, shrimp, pillbug practical info in other prezi insects and their kin millipedes, centipeds, etc. horshoe crabs, scorpions, spiders, mites, sea spiders
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