Transcript Lophophorates

CHAPTER 19 LOPHOPHORATES
PHORONIDA, BRACHIOPODS,
BRYOZOANS
Phylum Phoronida
Marine organisms
that live in
sediments
Phoronida characters
•Filter feeding
•Do not move
•Cilia create current to bring particles to
tentacles; then to mouth
•Metanephridia
•Blood vessel contains blood (w/ hemoglobin)
Phoronida
• Hermaphroditic
• Sperm released from
nephridia, collected by other
individual
• Embryo = actinotroch
Phylum Brachiopoda
• = “arm foot”
• 2-valve shell
• Marine lophophorates
Phylum Brachiopoda characters
• At poles or deep marine, permanently
attached to substrate
• Metanephridia
• Circulatory system w/heart and
contractile vessels - no blood pigment
Brachiopoda
• Sperm, eggs discharged
from nephridiopores
• Fert external
Phylum Bryozoa
• Moss animals
• Colonial animals that attach to
substrate
• Marine (5000 species) and
freshwater (50)
• Fossils (15,000)
Bryozoa
• Secrete a covering around body
• Asexual repro, hermaphroditic
Bryozoa
•Sperm into coelomic cavity, released
from openings in tentacles
•Neighbors collect sperm for fert.
•Some brood embryos
Digestion
• Phoronids, bryozoans:
U-shaped
• Brachiopods: U-shaped oneway tract
Nervous systems
• Ring at base of lophophore, around
esophagus, or by pharynx
• Mechanoreceptors and
chemoreceptors scattered