Diversity of Eukaryotic Life: Lophotrochozoa

bilateral

along central axis = mirror image, the doral and ventral side will be different

bilateria

___________ is a large clade of animals characterized by bilateral symmetry during embryonic development, triploblastic, major groups (protostomes or deuterostomes)

cephalization

_________________ is the evolutionary trend of concentrating sensory organs and nervous tissue at the anterior (head/front) end

deuterostomes

anus form first then mouth

protosomes

mouth forms before anus

mesoderm, ectoderm, endoderm

what are the germ layers in triploblastic organisms?

ectoderm, endoderm

what are the germ layers in diploblastic organisms?

eucoelomate

true coelom, a body cavity completely lined by mesoderm

pseudocoelomate

body cavity is partially lined with mesoderm

acoelomate

lack a true coelom - a fluid filled body cavity completely lined by mesoderm. - provides hydrostatic support.

lophotrochozoa

1.) trochophore larvae

2.) lophophore feeding - no molting

ecdsysozoa

molting

lophophore

feeding structure with ciliated tentacles

trochophore larvae

larvae propelled by cilia (common in annelids + mollusks)

larva

sexually immature and morphologically disinct from parent

Phylum Platyhelminthes

flatworms, simple bilateria, ~15000 free living and parasitic species, aecolmate, no repiratory or circulatory system.

flatworms

___________ are acoelomate, triploblastic, bilateral, lophotrochozoan protostomes. =

ciliated ephithelial cells

free living flatworms glide via _________ ______ ________ on central surface

Ladder-like

nervous system of platyhelminthes: a simple ____ ______ nervous system with an anterior and paired cerebral ganglia and nerve cords

cerebral ganglia

consists of neurons, cluster of neurons

ocelli

light senstive eye spots

auricle

chemosensory cell

osmoregulation

______________ by protonephrida in platymelmintes

flame cell

________ ____ = beating of cilia draws interstitial fluid into the flame cell then is filtered by a tubule water + waste passed through an excretory pore.