Admin Table of Contents
Are flatworms complex?
The flatworms, like the sponges (Phylum Porifera) and Phylum Cnidaria (Hydra, jellyfish, corals, and sea anemones) are multicellular. However, the flatworms are more complex in structure than either of the two other groups.
Why are roundworms more complex than flatworms?
How are roundworms more advanced than flatworms? How are segmented worms more adavanced than roundworms or flatworms? They have a Coelom. This allows room for all organs in between the guy and skin.
How are earthworms more complex than flatworms?
With a circulatory system to distribute blood and oxygen and a one-way gut, their bodies are enormously more complex than modern flatworms. Developing a gut that runs from one end of the body to the other was a major evolutionary step.
What level of complexity are flatworms?
Flatworms are flattened and have bilateral symmetry. They are triploblastic (have 3 embryonic tissue layers: ectoderm, mesoderm, and endoderm) and therefore have organ-level of organization. There is no body cavity, so they are acoelomate.
Which is the best description of a flatworm?
The flatworms, flat worms, Platyhelminthes, or platyhelminths (from the Greek πλατύ, platy, meaning “flat” and ἕλμινς (root: ἑλμινθ-), helminth-, meaning “worm”) are a phylum of relatively simple bilaterian, unsegmented, soft-bodied invertebrates.
Are there any flatworms that live on land?
Flatworms are a diverse group of animals in the phylum Platyhelminthes. Although most are fully aquatic, there are many species that exist on land in moist, terrestrial habitats, particularly those in the family Geoplanidae.
What kind of worms live in the tropics?
These worms are often variously called land planarians, terrestrial flatworms, or hammerhead worms (specific to a particular group; see Identification section for discussion). Terrestrial flatworms are most diverse in the tropics, especially SE Asia, Australia, Africa, and South America.
Are there any worms that are free living?
free-living worms (e.g., earthworms). 1) Phylum Platyhelminthes The phylum Platyhelminthes (platy, flat; helminth, worm) includes a diversity of marine, freshwater, and terrestrial worms, plus two rather important parasitic groups: the flukes and the tapeworms. Like cnidarians (= hydras, jellyfish, and corals), flatworms have a rather simple body