Lab 2 Vocab Flashcards
Polyphyletic
more than one common ancestor
Bilaterally symmetrical
Two equal sides (like us)
triploblastic
true mesoderm derived tissue and endoderm and ectoderm
Acoelomate
no coelom
gastrovascular cavity
digestion of food and the transport of nutrients throughout the body. only one opening to environment
cephalization
the concentration of sense organs, nervous control (head)
Phylum platyhelminthes
flatworms. acoelomate, cephalization, gastrovascular cavity, flame cell protonephridia.
Phylum platyhelminthes 3 classes
class turbellaria (some free living), trematoda and cestoidea
Phylum nematoda 1 genera
Ascaris
Phylum Annelida 3 classes
Class clitellatea, subclasses Oligochaeta, hirudinea and class polychaeta`
Class turbellaria
Free-living, ocelli and pharynx
Ocelli
simple eye/eyespot for light avoidance
pharynx
passageway between external opening and rest of resp/dig system
Class trematoda
“flukes” All parasitic. Multiple hosts, several developmental forms. Many features are adaptations to parasitic lifestyle
Class cestoidea
tapeworms. Parasites, complex life cycles. Complex head (scolex), flattened body consisting of segment-like proglottids containing gonads.
Proglottids maturing
shed from end of worm with lots of eggs
Phylum nematoda
Roundworms. Complete digestive tracts. They are part of ecdysozoa, the molt. pseudocoelomate
Complete digestive tract
with an anus!
Ecdysozoa
they molt
pesudocoelom
fluid filled and functions like hydrostatic skeleton, not completely lined with mesoderm
Ascaris
roundworm in human gut
Phylum annelida
eucoelomate, hydrostatic skeleton, free living, complete digestive systems, metamerism, setae, closed circulatory system
eucoelomate
body cavity derived entirely from mesoderm
setae
chitinous bristles that aid in attachment and prevent backsliding during locomotion
peristaltic locomotion
sequential elongation and contraction of body segments that relies on hystostatic skeleton
metamerism
true segmentation with every organ segmentally arranged
subclass oligochaeta
setae in small bundles, earthworms, true segmentation
Class clitellata 2 subclasses
oligochaeta, hirudinea
subclass hirudinea
leeches, posterior and anterior suckers, no septa
Class polychaeta
marine, burrow in mud/tubes in calcium carbonate, predators or filter feeders (flower like), modified setae bearing appendages (parapodia)
parapodia
modified setae-bearing appendages adapted for specialized functions
