Lophotrocozoa Flashcards
1
Q
Bilateria
A
- Triploblastic
- Cephalization
2
Q
Phylum Acoela
A
- Acoelomate
3
Q
Phylum Platyhelminthes
A
- Flatworms
- Acoelomate
4
Q
Class Turbellaria (Platyhelminthes)
A
- Epidermis covered by cilia
- Ventral nerve cords
- Pair of ganglia (brain) at front
- No anal opening
5
Q
Class Cestoidia (Platyhelminthes)
A
- Tapeworms
- Lack Digestive system
- Scolex; suckers / hooks for latching to host’s gut
- Proglottids; long chain of reproductive segments
- Two host life cycle
6
Q
Phylum Rotifera
A
- Small but multicellular
- Alimentary canal; digestive tube with seperate mouth and anus within fluid filled psuedocoelom
- Parthenogenesis; reproduce by unfertilized egg
7
Q
Phylum Brachiopoda
A
- Lophophore; fan of cilliated tentacles surrounding mouth
- True coelom
- Attach to seafloor by stalk
- Resemble bivalve molluscs
8
Q
Phylum Ectoprocta
A
- Lophophore; fan of cilliated tentacles surrounding mouth
- True coelom
- Sessile colonial
- Hard exoskeleton
9
Q
Phylum Mollusca
A
- Mantle; thin layer of tissue that secretes shell
- Mantle cavity; water filled respiratory / excretory chamber
- Muscular foot
- Organs contained within visceral mass
- Radula; strap-like mouth
- Gills
- True Coelom
- No clear segmentation
- Trochophore; cilliated larvae
- Gonads
10
Q
Class Polyplacophora (Mollusca)
A
- aka Chitons
- Eight dorsal armor plates
- Foot holds Chiton to rock, Radula scraps off algae
11
Q
Class Bivalvia (Mollusca)
A
- Shell divided into two halves
- Filter feeders, no Radula
12
Q
Class Gastropoda (Mollusca)
A
- Snails and slugs
- Single, coiled, tubular shell
- Trocophore larvae
- Torsion synapomorphy (mantle cavity and anus over head)
13
Q
Class Cephalopoda (Mollusca)
A
- No external shell
- Tentacles
- Beak; modified Radula (poisonness)
- Siphon; fused tube of mantle used for jet propulsion
- Closed circulatory systems
- Excellent vision
- Complex behaviour
- Maternal Care
14
Q
Phylum Annelida
A
- Segmented worms (internal septa)
- Cephalization
- Coelomates
- Closed circulatory system
- Complete digestive system with anus
15
Q
Class Polychaeta (Annelida)
A
- Parapodia; fleshy lobes, “not quite feet”.
- Chaetae; chitinous bristles.
- Differentiated Head with sensory antennae
- Sedentary; capable of movement, though not habitual.
- Errant (active) species; predatory
- Sedentary; ingest substrates, suspension feed, deposit feed
- Free spawning
