Read e-book online Advances in Marine Biology, Vol. 19 PDF

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

ISBN-10: 0120261197

ISBN-13: 9780120261192

Quantity 25 of this authoritative evaluate sequence keeps the excessive ordinary set by means of the editors some time past. Marine biologists in all places have come to worth and luxuriate in the big variety of thought-provoking papers written by way of invited specialists. during this quantity are reports of 4 animal teams which span the full diversity of the marine nutrition chain. The function of parasites in ecology is a turning out to be curiosity and the parasites of zooplankton are defined intimately for the 1st time. points of thegastropods, cephalopods and fish existence also are tested intimately.

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Digestion is always intracellular. The mode of embryonic nutrition has so far only been established by short and incomplete observations by several previous investigators, so that new careful studies are obviously needed on this topic. IV. ACTIKOTROCH LARVAE A. General Account The characteristic phoronid larva is termed Actinotrocha (or actinotroch) which must only be used as a technical name of the larval forms as stated by Sil6n (1952) in a footnote. The actinotroch has a pelagic existence: swimming near the sea surface for several days (Table 11).

Then the metacoel (or trunk coelom) undergoes schizocoely; it establishes a ventral mesentery which unites the trunk wall to the digestive tract and anteriorly, at the level of the tentacles, a definitive septum (or trunk septum) which assumes the status of a mesentery with the development of the mesocoel (or collar coelom). Between the preoral septum and the trunk a blastocoelic cavity persists until late in the actinotroch development (Fig. 10). The mesocoel develops into a horseshoe shape (probably by schizocoelic formation according to Ikeda, 1901; Goodrich, 1903) within the blastocoelic space over the trunk septum in well-developed larvae.

Zimmer (1978) established t h a t there was no difference between the larvae of Phoronopsis harmeri and Phoronopsis viridis;it must be remembered t h a t both species are considered as synonyms (Marsden, 1959; Emig, 1971a, 1979) although Zimmer’s (1978) opinion has never been further supported, A . 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.

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


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