The lack of circulatory and respiratory organs limits platyhelminthes to sizes and shapes that enable gas exchange ( of oxygen and carbon dioxide ), to take place all over their bodies by simple diffusion.
32.
The epidermal cells of acoelomorphs are unable to proliferate, a feature that is only shared with rhabditophoran flatworms and was for some time considered a strong evidence for the position of Acoelomorpha within Platyhelminthes.
33.
According to others, acoelomates include the cnidarians ( jellyfish and allies ), and the ctenophores ( comb jellies ), platyhelminthes ( flatworms including tapeworms, etc . ), Nemertea, and Gastrotricha.
34.
The "'gastrovascular cavity "'is the primary organ of digestion and circulation in two major animal phyla : the Cnidaria ( including jellyfish and corals ) and Platyhelminthes ( flatworms ).
35.
The "'Macrostomidae "'are a family of small basal free-living flatworms ( Macrostomida, Turbellaria, Platyhelminthes ), and members of the marine, brackish, freshwater meiobenthos.
36.
These analyses had concluded the redefined Platyhelminthes, excluding Acoelomorpha, consists of two monophyletic subgroups, Catenulida and Rhabditophora, with Cestoda, Trematoda and Monogenea forming a monophyletic subgroup within one branch of the Rhabditophora.
37.
Schistosomatids are dioecious ( individuals are of separate sexes ) which is exceptional with regards to their phylum, Platyhelminthes, in which most species are hermaphrodidic ( individuals possess both male and female reproductive systems ).
38.
The "'Dolichomacrostomidae "'are a family of small basal free-living flatworms ( Macrostomida, Turbellaria, Platyhelminthes ), and members of the marine, but also brackish, meiobenthos.
39.
Among invertebrates, the purinergic signalling system has been found in bacteria, amoeba, ciliates, algae, fungi, anemones, ctenophores, platyhelminthes, nematodes, crustacea, molluscs, annelids, echinoderms, and insects.
40.
Parasitic infestations, stings, and bites in humans are caused by several groups of organisms belonging to the following phyla : Annelida, Arthropoda, Bryozoa, Chordata, Cnidaria, Cyanobacteria, Echinodermata, Nemathelminthes, Platyhelminthes, and Protozoa.
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