Platyhelminthes & 4 Enigmatic Protostome Phyla

they are the first animals to move with intent thereby pursuing prey actively

Why does the video (Flatworms: The First Hunter) claim that the flatworm might have been the first hunter?

bilateral symmetry, head with eyes, central nervous sytem, internal fertilization

Name anatomical features that appeared on the flatworm before any other animal.

paired senses through triangulation gather info on the prey

Explain how stereo senses help an animal hunt.

internal fertilization

The first hunter, the flatworm, was also the first to evolve what type of fertilization?

hermaphroditic worm

A __________ possess both male and female reproductive organs or functions. Its evolutionary advantage is that an individual organism can reproduce with another, considering that it is of the same species, regardless of which sex the individual is.

Turbellaria, Monogena, Trematoda, Cestoda

four classes of flatworms

aquatic habitat

Turbellaria habitat

free-living, some are parasites and comensals

Turbellaria mode of living

sexual hermaphroditic, asexual transverse fission

Turbellaria reproduction

aquatic and some brackish water, terrestrial as endoparasites

Monogena habitat

ectoparasites

Monogena mode of living

only sexual, hermaphroditic

Monogena reproduction

inside its host’s body

Trematoda habitat

endoparasites

Trematoda mode of living

hermaphroditic, both sexual and asexual

Trematoda reproduction

inside the digestive track of hosts

Cestoda habitat

endoparasitic

Cestoda mode of living

hermaphroditic sexual

Cestoda reproduction