Brachiopods vs Bivalves, Lophophorates, Echinoderms Flashcards
(22 cards)
What is the number of species in Brachiopoda?
350 species
What type of feeding mechanism do Brachiopoda use?
Filter feed with lophophore
How are Brachiopoda secured to surfaces?
Secured by a stalk (pedicle)
What type of shells do Brachiopoda have?
Paired shells
What are the characteristics of Brachiopod valves?
Unsymmetrical valves, dorsal and ventral valves
What distinguishes bivalve molluscs from Brachiopoda?
Symmetrical valves, lateral flattening valves, muscular foot
How do bivalve molluscs filter feed?
Filter via gills
What is convergent evolution?
Differences occur via convergent evolution
How many species are there in Bryozoans?
5000 species
What type of organisms are Bryozoans?
Colonial sessile – zooids
What structure encloses each zooid in Bryozoans?
Box made of cuticle of chitin, protein, possibly calcium carbonate
What is Lophotrochozoa?
NOT a phylum – includes annelids, molluscs, platyhelminths
How many species do Echinoderms have?
7000 species
What symmetry do Echinoderms exhibit?
Radially symmetrical
What type of nervous system do Echinoderms have?
Diffuse nervous system – no cephalisation
What is a key feature of the Echinoderm water vascular system?
Network of water vessels in the body
What are the five classes of echinoderms?
- Crinoidea
- Asteroidea
- Ophiuroidea
- Echinoidea
- Holothuroidea
What is the function of tube feet in Echinoderms?
Operated by hydraulic pressure within water vessels
What does the Lophophore structure look like?
Circular/horseshoe shaped fold with ciliated tentacles
Where is the anus located in relation to the tentacular ring in Lophophore?
Anus is outside the tentacular ring
What is the coelomic cavity’s role in Lophophore tentacles?
Each tentacle is hollow – contains a branch of coelomic cavity
