. A biology of Crustacea. Crustacea. 20 A BIOLOGY OF CRUSTACEA by the fine setae which project backwards from the inner edges of the limbs to form a strainer between the median space and the interlimb spaces. The main filtering region is near the bases of the limbs where the flow into the interlimb spaces is greatest. During the backstroke (towards the tail) water is pressed out of the interlimb spaces; much escapes via the tips and outer edges, providing the thrust which propels the animal through the water. Some water is also forced back into the median space, blowing food particles off the
. A biology of Crustacea. Crustacea. 20 A BIOLOGY OF CRUSTACEA by the fine setae which project backwards from the inner edges of the limbs to form a strainer between the median space and the interlimb spaces. The main filtering region is near the bases of the limbs where the flow into the interlimb spaces is greatest. During the backstroke (towards the tail) water is pressed out of the interlimb spaces; much escapes via the tips and outer edges, providing the thrust which propels the animal through the water. Some water is also forced back into the median space, blowing food particles off the setae. At the end of a backstroke two succes- sive limbs become pressed closely together, because the rear limb starts its forward stroke while the front limb is still moving back-. FILTER SBTAE EXITS OA OUTER FLAP Fig. i6. Trunk limb of Artemia salina (Anostraca). The limb is shown as it appears when flattened, but in life it is bent as shown in the section in fig. 17. Note the numerous intrinsic muscles which can alter the shape of the limb. The detailed structure of the filter setae is too fine to be shown. The line A-B gives the approximate level of the section shown in fig. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Green, J. (James), 1928-. Chicago, Quadrangle Books
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Keywords: ., bookcentury1900, bookcollectionbiodiversit, booksubjectcrustacea
