Lecture 13 Flashcards
Deuterostomes are – symmetrical
bilaterally
homalozoa, crinozoa, asterozoa, echinozoa
phylum echinodermata
homalozoa
carpoids
crinozoa
crinoids
asterozoa
starfish and brittle stars
echinozoa
sea urchins and sea cucumbers
Hemichordata and Echinodermata are –
sister groups
carpoids are – of the crown group echinodermata
plesion
calcichordate fish morphology is
convergent
echinoderms bilateral symmetry –> asymmetry and attachment to one pole –>
5-fold symmetry at opposite pole via 3-fold state
first synapomorphy (shared derived character) of echinoderms
calcite stereom
echinoderm skeleton is a cubic emulsion of living –
protoplasm and mineral
echinoderm: the interface between mineral and living tissue is a surface of —
minimum curvature
T/F: echinoids almost went extinct
true
echinoid test is a –
stiffened wall