By J.H.S. Blaxter, Frederick S. Russell, Maurice Yonge (Eds.)
Quantity 25 of this authoritative evaluate sequence keeps the excessive common set through the editors long ago. Marine biologists far and wide have come to worth and luxuriate in the wide range of thought-provoking papers written by way of invited specialists. during this quantity are stories of 4 animal teams which span the complete variety of the marine meals 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. points of thegastropods, cephalopods and fish lifestyles also are tested intimately.
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Extra resources for Advances in Marine Biology, Vol. 19
The transformation of this actinotroch into Phoronis muelleri was established by Selys-Longchamps (1903). The other main works on A . 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.
The greatest density of this species is 18 000 individuals/m2, reached in fine well-sorted sand at 4-6 m depth, although occurrences are also mentioned from mud to shelly coarse sand with a fine sand fraction, as well as in Zostera or Cymodocea sea-meadows, and polychaete reefs. I n the Mediterranean benthic populations, P. psummophila live mostly in the biocoenoses of fine well-sorted sand and of superficial muddy sands in sheltered areas which show several facies as sea-meadows (PArGs, 1967).
Branchiata, to an unintentional misunderstanding of statements by earlier workers, and to the fact that the early workers recognized about 20 phoronid species where there are presently about ten. There is no doubt t h a t our knowledge of actinotroch species is far from satisfactory and the following list of actinotrochs needs particular attention in the future and probably some modifications, and also additions will have to be made. 1. Larva of Phoronis ovalis The sexual reproduction of Phoronis ovalis has only been described by Silkn (1954a).
Advances in Marine Biology, Vol. 19 by J.H.S. Blaxter, Frederick S. Russell, Maurice Yonge (Eds.)