Aurelia aurita (Scyphozoa, Semaeostomae) marine, single-living polyp, generation of medusa. The formation of medusa (strobilation) is well established. Bud development differs from that in hydrozoa. It is similar to that of Cassiopea sp. 
 

Cassiopea andromeda and C. xamachana (Scyphozoa, Rhizostomae) marine, single-living polyp, generation of medusa. The polyps develop buds which can be induced to polyp formation with the same chemical inductors as the planula larvae produced by sexual reproduction. The tip of the bud will become - different from hydrozoa - the future foot of the polyp. 
 

Dynamena pumila (Hydrozoa, Hydroidea, Thecata) marine, builds up colonies, no generation of medusa. Monopodiale colonies with a rigid, chitinous perisarc. The sprout (hydrocaulus) laterally develops a repetitive pattern of polyps with the central axis growing more or less continously.

Hydra vulgaris, H. magnipapillata, wt 105, mutants of H. magnipapillata: mh-1
(Hydrozoa, Hydroidea, Athecate). freshwater, single-living polyp, no generation of medusa. Hydra reproduce mainly asexually by budding. 

Hydractinia echinata (Hydrozoa, Hydroidea, Athecata) marine, build up colonies, no generation of medusa. Embryogenesis, metamorphosis from larvae into a polyp, the formation of a colony, and the polymorphism of the polyps are highly amenable to experiments.
 

Gonothyrea loveni,Laomedea flexuosa, and  Obelia longissima (Hydrozoa, Hydroidea, Thecata) marine, build up colonies, no generation of medusa. The polyps (hydranths)are sitting on upright stalks (hydrocauli) covered by a chitinous perisarc. Sympodial growth. The tip of the hydrocaulus transforms to into a polyp, while lateral a new tip is formed. Pattern formation in a colony and the formation of (abundant structured) pattern elements of the hydrocaulus are highly amenable to experiments.
 

Thecocodium quadratum (Hydrozoa, Hydroidea, Athecata) marine, build up colonies, has a generation of medusa. T. quadratum shows a polymorphism of polyps. The formation of medusa is easy to study whereas the embryogenesis and the metamorphosis can not be studied in the laboratory. 
 

Chordata

Ciona intestinalis(Chordate, Tunicata), marine. Embryogenesis is easy to study. Culturing in the laboratory is easy but it is yet not possible to obtain adult, fertile animals. 

Brachidanio rerio (Chordate, Vertebrate) freshwater. The embryogenesis of fish is easy to study.