Ecdysozoans Flashcards
are Ecdysozoans protostomes of deuterostomes?
Protostomes
Name the first two phyla of panarthropoda studied in depth
Tardigrada and Onchophore (velvet worms)
Name the two phylum of nematoida studied in depth
Nematoda and Nematomorpha
Name the three phyla of scalidophora studied
Loricifera, Kinorhyncha (mud dragons) and priapulida (penis worms)
What is treptichnus?
Genus of unknown lower Cambrain animals responsible for trace fossils.
What links treptichnus and priapulids (penis worms)?
They both burrow in similar ways, related?
Name three lineages that originated in the Ediacuran?
Panarthropoda, nematoida and scalidophora
Name some stem group arthropods
Opabinia, hallucigenia and anomalocaris.
Briefly describe Opabinia
5 eyes, mouth under head facing backwards with proboscis, found in Burgess shale. (mid cambrian)
When were the major extant lineages established by?
Carboniferous
Give 3 synapomorphies of pancrustacea
- Mandible formed of a fused limb base
- Similarities in development of CNS
- Similarities in eyes and nerves
Give the 4 convergent traits of insects and myriapods
single branch limbs
tracheal system for breathing
Malphigian tubes for nitrogen excretion
Lack of appendages corresponding to second antennae of crustaceans.
Name the three genes mention that are expressed in wing development
Wingless (wg)
vestigial (vg)
apterous
Genes involved in drosophila wing development are also expressed in which part of crustacea?
Epipod limb (gills)
combinational model is supported by what?
studies in the red flour beetle and the mealworm beetle
