Studied by 0 people
Looks like no one added any tags here yet for you.
Which Superphylum?
Lophotrochozoa
Lophophore
feeding apparatus
cilia around the mouth
Trochophore larvae
Larva have two bands of cilia
Body Plan
Bilateral
True or False: Bilateral would suggest cephilization.
True
Tissues?
Triploblastic
Body Cavity?
Acoelomate
No body cavity
Mesoderm tissue differentiates into layer of longitudinal muscle and a layer of circular muscle. ALSO:
Mesenchymal cells that are excretory
Are they considered to be a Protostome
E yes bro
Protostome meaning?
During gastro, first hole is mouth, second is anus
Feature of body cavity
Flexibility
Eye spots are called
Ocelli
Sense light and dark
Chemical receptors
Free-living species are
predators/scavengers
Digestive system?
Incomplete
Started forming a true digestive system but stopped (still protostome)
Branching GVC
Diffusion and gap junctions
Excretory System
Has one
Network of tubules running along the periphery of the animal
Connect to flame cells with cilia that propel metabolic waste out of the body through pores (epidermis)
Nervous system?
Has one
Consists of two lateral nerve cords running the length of the body
Transverse nerves
____ cerebral ganglia surround _____ for sensing light and chemicals
Two; ocelli
Respiratory system?
Lacks
O2 is absorbed through epidermis; CO2 released
Limits thickness of body
Circulatory System?
Lacks
Gases move through diffusion and gap junctions
Transverse nerves can
Sense poking on the side of the body
Cause movement away
Mouth
Positioned at the posterior, surprisingly
Reproduction
Most species are monecious
Highly regenerative
Asexual reproduction is
Through fragmentation
Sexual reproduction is
Internal fertilization
Penis fencing
