EXAM 2: Eukaryotes 2 (phylogenies, protosome, deutrosome)

our sister-choanoflagellate

• aquatic, somopolitican

• single flagellum (unikonts)

• feed on bacteria (important in food chain)

• unicellular/colonial

Animals

• mulicellular

• lack cell walls

• heterotrophs

• move

• have neurons and muscle cell (except for sponges)

Sponges (porifera)

• aquatic

• feed passively with pores

• sessile

Jellies

• aquatic carnvorous

• diploblasts

• cnidarians sting

• ctenophores don’t

protosome development, cns coelem

example.

Diploblast= endoderm and ectoderm

stages

Tripoblasty (more common)

answer

Protosome and deutereostome (difference in gastrulation)

Protosome and deutrosome (difference in coelem formation)

Mesoderm, one solid and D= pinches

Body segmentation apprears in

Annelids, Chordates, Arthropods

Protosome: Lophotrozoncoan

• grow and grow

• feeding culture

• trophochor larvae (cilia midband)

• Both present in development

Spiral cell cleavage in embryogeneneis (embryo) only in lophochozonas

Platyhelminthes (flatworms)

Annelids

Leech, worms, polychaetes (kataaa)

Mollusks

(bivalves, cephalopods, and gastropods)

Water to land transition

stuff

Ecdysozonas

molting, nematod and artropods

Nematod

Tardigrades and Onychophorans

the cute looking shi

arthropods

Modularity?

Selection occur independley based on seperate segments

Protosome- Ecdysozoan- arthropod

C (lose of one pair of antenna)

complete vs incomplete metamorphosis

Myriapoda

Crustacea

C

Spiders

Harvester

Daddy long legs not venomous

We are most closely related to…

C! Sea urchin: echinodermata