protostome animals
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3 adaptations that were required for protostomes to thrive on land
• exchange gases • avoid drying out • hold up their bodies under their own weight
how to round worms and earth worm exchange gas?
across their body surface
a body cavity that forms later in development ( it forms from cavities that arise within blocks of mesodermal cells
coelom
what are three major components of a mollusk?
1 foot 2 visceral mass 3 mantle
the region in a protostomes that contains most of the main internal organs and the external grill
visceral mass
covers the visceral mass in a protostome and secretes a hard calcium carbonate shell
mantle
types of mollusks
bivalves Gastropods chitons Cephalopods
how does a hemocoel differ from a coelom?
it is not lined in mesoderm
a body cavity where body fluids bathe the organs directly in an open circulatory system
hemocoel
a unique molluscan feeding structure with functions like a rasp or file
radula
a tube that forces water out of Cephalopods to propel them forward
siphon
what is a synapomorphy for Ecdysozoan?
molting
shedding an exoskeleton or external covering
molting
defining features of anthropods
a segmented body an exoskeleton jointed appendages
regions in a segmented body
tagmata
species in which juveniles aka nymphs look exactly like their parents are called
hemimetabolous/ incomplete metamorphosis
species in which there is a distinct larval stage
holometabolous/ complete metamorphosis
larva that’s in it’s protective case
pupa
what are the three morphological traits that define lophotrochozoans?
• lophophore • trochophore • spiral pattern