By J. B. Jennings (auth.)
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Extra info for Feeding, Digestion and Assimilation in Animals
2) and the Radiolaria. Fw . 2. Glohigerina, showing the shell with filose pseudopodia emerging from the shell pores. x 30. g. Actinosphaerium (Fig. 3), the pseudopodia are stiff structures, often with a supporting fibre, radiating out from the central body. These, again, have sticky surfaces which trap food particles, and living micro- Animal Feeding Mechanisms. I 23 organisms touching them may be paralysed by toxic substances released at the point of contact. Adjacent pseudopodia collapse and coalesce around the trapped food and digestion occurs within the resulting protoplasmic mass.
Setous mechanisms The collection of small food particles from the surrounding water by means of chitinous setae which form a fringe to various body appendages is fairly common amongst the Crustacea, and a few examples occur also in aquatic insect larvae. In the crustaceans which feed by means of setae the movement of various appendages such as antennae and limbs causes water to flow either over or through the setae fringing these structures. Suspended or free-swimming food particles are retained by the setae, and subsequently passed to the mouth for ingestion or mastication, whilst the water current created by the moving appendage is used, very often, for locomotion.
Examples of ciliary feeding polychaetes are Sabella, Spirorbis and Pomatoceros. In Sabella (Fig. 8) the anterior end bears a circle of pinnate tentacles which form the filtering mechanism. Cilia on the pinnules draw currents of water between them and suspended particles are retained and transported by other cilia to the base of the pinnule. Here they are passed into a central ciliated groove running the length of the tentacle and are swept along this towards the mouth. Ciliated folds between the bases of the tentacles and mouth sort the captured particles into large ones which are rejected, medium sized ones which are retained and used in tube building, and small ones which are passed to the mouth and ingested.