Download Advances in Marine Biology, Vol. 19 by J.H.S. Blaxter, Frederick S. Russell, Maurice Yonge (Eds.) PDF

By J.H.S. Blaxter, Frederick S. Russell, Maurice Yonge (Eds.)

Quantity 25 of this authoritative evaluation sequence maintains the excessive general set by way of the editors long ago. Marine biologists in every single place have come to worth and luxuriate in the wide range of thought-provoking papers written through invited specialists. during this quantity are experiences of 4 animal teams which span the total diversity of the marine nutrition chain. The position of parasites in ecology is a starting to be curiosity and the parasites of zooplankton are defined intimately for the 1st time. facets of thegastropods, cephalopods and fish existence also are tested intimately.

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During both movements the tube is concomitantly being secreted, and during this sticky phase various particles of the immediate environment adhere to the tube, which therefore reflects the nature of the substratum. g. , and fine pebbles. There was a great amount of controversy among previous authors concerning the selection of substratum particles for the tube. e. Andrews (1890) who named P . architecta (synonym of P. psammophila) on a possible grain selection. Other authors such as Selys-Longchamps (19071, Hyman (1959), Emig (1971), say, on the contrary, t h a t the particles adhere randomly to the sticky tube without specific sorting of grains by the animal.

Recent observations on Phoronis hippocrepia reveal the presence of A and B cell types in the major length of the lophophore. (a’)Relative abundance of the epidermal gland cell types (in yo)along the hody wall of F . psammophila (from C. Pourreau, unpublished results); (h)some aspect ofthe tube laying in relation to the thickness of the tube. A : acidophilic coating layer; B: basophili~. coating layer (from Pourreau, 1979). The main thirkness of the tuhe is about 10pm. basophilic in nature and secreting protein, probably participates in tube formation.

Branchiata are from Selys-Longchamps (1907), S i l k (1954a), Emig (1973a), Siewing (1974a) and Herrmann (1976). Recently, Zimmer (1978) related a larva to Phoronis architecta, but this larva belongs to Actinotrocha branchiata, which confirmed the confusion introduced by Brooks and Cowles (1905), and discussed by Emig (1977c),between P . muelleri and P . psammophila which may both be mixed in the same locations. Actinotocha branchiata is a transparent larva with numerous pigmented amoebocytes; yellow pigments are located at the base of the tentacles, around the preoral lobe and near the ciliated perianal ring.

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