Unlike leeches and earthworms, flatworms are unsegmented, lack respiratory and circulatory system and don’t possess an anus! This means that food and wastes arrive and are ejected by the same front door 👀 Although, they do have a mouth, pharynx and some intestines!
Flatworms possess sense organs such as auricles, that are full of tactile and chemoreceptive cells, eyespots acting as photoreceptors, statocysts used for equilibrium and rheoreceptors used to sense the direction of the water currents.
One classic characteristic of Turbellaria flatworms is the presence of many cilia on the epidermal layer. These cilia, aided by mucus secretion, are used for locomotion! You can see in the second video how the motion of those cili affect nearby poop particles 💩
Beat is from amazing @arithmetikmusiq ✨
References:
Hickman, C. P., Roberts, L. S., Larson, A., Ober, W. C., & Garrison, C. (2015). Animal diversity. WC Brown. 169-173.
Noreña, C., Damborenea, C., & Brusa, F. (2015). Phylum Platyhelminthes. In Thorp and Covich's Freshwater Invertebrates (pp. 181-203). Academic Press.
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