Lab 9 - Invertebrates (2) Flashcards
two other lineages in Bilateria
Ecdysozoa
Deuterostomia
the commonality of ALL members in clade Ecdysozoa
all display ecdysis (moulting of outermost layer)
phyla in clade Ecdysozoa
Phylum Nematoda
Phylum Athropoda
3 lineages in Phylum Arthropoda
Myriapods
Pancrustaceans
Chelicerates
3 distinguishing features of Deuterostomes
- radial, indeterminate cleavage
- coelom forms from buds of the mesoderm
- blastophore forms anus
two phyla in Deutersotomia
- Phylum Chordata
- Phylum Echinodermata
Phyla Echinodermata includes
- sea stars
- urchins
- sand dollars
- sea cucumbers
phyla Chordata includes
- Cephalochordate - lancelets
Urochordata - Tunicates
Vertebrata - Vertebrates
4 characteristics of Phyla Chordata
- notochord
- post-anal tail
- dorsal hollow nerve cord
- pharyngeal gill slits
Ecdysozoan development
protostome invertebrates
Phylum Nematoda are
round worms
Nematode belong to which major lineage
Ecydosozoa
way of life for Nematodes
either free-living or parasitic
type of coelom in Nematodes
pseudocelomate
are Nematodes segmented or unsegmented
unsegmented
what covers a Nematode
cuticle
example of a parasitic Nematode
Ascaris
where does the Nematode Ascaris live
in the intestines of the host
male vs female Ascaris Nematodes
male is smaller than the female and has hooked posterior end
least to most inclusive
Ascaris: Nematodes: Ecdysozoa: Bilateria: Eumetazoa: Metazoa
type of symmetry in Phylum Arthropoda
bilateral
are members in Phyla Arthropoda segmented or unsegmented
segmented
type of coelom in Arthropoda
eucoelomate
type of development in Arthropoda
protostome