. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 346 IV ( \\II'OS \\1) K. \1\NN. .V Scanning electron micrographs of the prcoral velar cilia tips of(A) Spmilti \iiliiln\tniti. (B) Miilinui liiii-rcili\. and ((') Rangm iiiiH'iila larvae. Note ihe biconcave paddles in V w>//(/m;m,; and the terminal discs in M. lui. \imvv identifies a single disc distal to the cilia tip in U liiii-inii i id tim cancc of this question is pinbablv minimal in lh;it hotli the larvae and adults of these species exhibit distinctly different salmiiv optima « ampos. ll)SS) which are re- flected in
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 346 IV ( \\II'OS \\1) K. \1\NN. .V Scanning electron micrographs of the prcoral velar cilia tips of(A) Spmilti \iiliiln\tniti. (B) Miilinui liiii-rcili\. and ((') Rangm iiiiH'iila larvae. Note ihe biconcave paddles in V w>//(/m;m,; and the terminal discs in M. lui. \imvv identifies a single disc distal to the cilia tip in U liiii-inii i id tim cancc of this question is pinbablv minimal in lh;it hotli the larvae and adults of these species exhibit distinctly different salmiiv optima « ampos. ll)SS) which are re- flected in the culture conditions used here. In summary, we believe the paddle and discocilia described here to be genuine structures. The function of the modi tied velar cilia is debatable. Matera and Davis (1982) concluded that previous litera- ture "collectively indicate that dilations of ciliary mem- branes represent a common morphological specializa- tion subserving ; The structures de- scribed by OFoighil (1985) are also appropriately located for sensory function. However, they are slightly smaller than previously described cilia modifications. Onlv the "secretory" cilia described by Tamarin ct ul. (1974) are thought to have a primary function that is other than sensory. As mentioned earlier, the primary function of the preoral bands in the bivalve larval velum is generally considered to be in locomotion and food gathering. The sensory function has received little attention; however, consideration of veliger swimming behavior, wherein larvae progress in a vertically oriented helix with the ve- lum extended in the direction of motion (see Cragg and Gruffydd, 1975; Cragg. 1980: Mann and Wolf. 1983). suggests that such a function is reasonable. The ability to combine locomotion and chemosensation to direct ori- ented movement along a gradient of chemostimulant has yet to be demonstrated in bivalve larvae. Chemosensory responses associated with settl
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
