Freshwater Animals. Note Ctenophores and Echinodermata are marine phyla; all other phyla have representatives in freshwater. Phylum Porifera: The sponges. Sponges are mainly marine but there are ~25 freshwater species described.
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Note Ctenophores and Echinodermata are marine phyla; all other phyla have representatives in freshwater.
Schistosoma life history:
Fused cephalothorax and abdomen
Six pairs of appendages,
4 pairs of legs most conspicuous
Paired, filamentous gills
Other aquatic vertebrates include amphibians, reptiles, birds and mammals.
These animals are often of interest as high-order predators, or for ways in which they alter their environment.
Mostly associated with shallow habitats and aquatic-terrestrial interface.