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 evaluate sequence keeps the excessive average set by means of the editors some time past. Marine biologists all over the place have come to price and luxuriate in the big variety of thought-provoking papers written by way of invited specialists. during this quantity are experiences of 4 animal teams which span the full diversity of the marine foodstuff chain. The function of parasites in ecology is a growing to be curiosity and the parasites of zooplankton are defined intimately for the 1st time. elements of thegastropods, cephalopods and fish existence also are tested intimately.
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Extra info for Advances in Marine Biology, Vol. 19
Harmeri is large, transparent, without epidermal pigmentation; only concentrated yellow pigmented amoebocytes occur in characteristic locations: margin of the preoral lobe, tentacles, metasomal sac, collar ring muscle, oesophagus and perianal ciliated ring. There are two pairs of blood masses which are located as follows: one discshaped pair in the dorso-lateral corners of the preoral lobe and one pair elongate in the collar, ventro-laterally a t the site of the third tentacles (Figs 9, 18). The larva is ready t o metamorphose a t the 20tentacle stage without the presence of adult tentacles.
Goodrichi after description of Goodrich (1903), A . spauldingi after Spaulding (1906), A . haswelli A and B according to Haswell (1893),A . ikedai C after Ikeda (1901),and A . Actinotrocha chata, recently discovered by Forneris (1959), is probably the tententacle stage of a known species. C. On the latter point, however, Zimmer (1964) and Herrmann (1976) do not agree. The actinotroch sinks to the bottom; this behaviour seems to be induced by bacteria or chemical substances as metamorphosis proceeds (Forneris, 1959; Herrmann, 1976).
Psammophila). Close n-n distances need a stratification of the lophophores to provide a fully tentacular expansion, which is especially observed in clumps of burrowing or encrusting forms. Such a disposition in suspension feeders always requires some water currents to bring food. The turbidity of the sea water is not a factor affecting the abundance of the phoronids. Figure 22 is compamble with the curves published by Ryland (1976, Fig. 35) on Bryozoa. Similar figures would probably be established for hard-substratum species.
Advances in Marine Biology, Vol. 19 by J.H.S. Blaxter, Frederick S. Russell, Maurice Yonge (Eds.)