Results 221 to 230 of about 25,407 (249)

Incubation and scissiparity in Sabellidae (Polychaeta)

Journal of the Marine Biological Association of the United Kingdom, 1984
Incubated embryos are here recorded from the Sabellinae Amphiglena mediterranea, Potamilla neglecta and Perkinsiana antarctica, and the Fabriciinae Fabricia sabella, Fabriciola chilensis, Oriopsis alata and Oriopsis ehlersi, but incubation has not been observed in most species of Sabellinae, nor in any Myxicolinae.
Phyllis Jones-Knight, Nigel Bowden
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Polychaeta of the Western Canadian Arctic

Journal of the Fisheries Research Board of Canada, 1958
A summary of the species of Polychaeta hitherto recorded from the western Canadian Arctic is given. Each of the species enumerated is considered in the light of its known, or unknown, occurrence in each of two regions to the west (northern Alaska and the Chukchee Sea) and two to the east (Hudson Bay and Greenland) respectively.
C. Berkeley, E. Berkeley
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Functional Morphology of Eunicidan (Polychaeta) Jaws

The Biological Bulletin, 2017
Polychaetes exhibit diverse feeding strategies and diets, with some species possessing hardened teeth or jaws of varying complexity. Species in the order Eunicida have complex, rigid, articulated jaws consisting of multiple pairs of maxillae and a pair of mandibles.
Kelly M. Dorgan, W. Cyrus Clemo
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�ber die Cuticula von Platynereis dumerilii (Polychaeta) [PDF]

Zeitschrift f�r Zellforschung und Mikroskopische Anatomie, 1966
Die Cuticula von Platynereis dumerilii liegt den Epidermiszellen auf. Ihre Matrix ist von zahlreichen, oberflachenparallelen, extrazellularen Fibrillenlagen durchzogen, die sich schichtweise kreuzen. In den Maschen dieser gekreuzten Fibrillenroste ziehen durchschnittlich 80 mμ weite Mikrovilli der Epidermiszellen bis in die Epicuticula.
Albrecht Fischer, Jost Brökelmann
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The direction of evolution within the Polychaeta

Journal of Natural History, 1997
The phylogenetic systematics of the polychaetes, i.e. the non-clitellate annelids, depend on which characters are regarded as belonging to the bauplan of the annelid stem species. The main competition is between two diametrically opposed hypotheses: the stem species was either (1) an errant, epibenthic organism with well-developed prostomium and ...
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Pigments ofChaetopterus variopedatus(polychaeta)

Proceedings of the Royal Society of London. Series B - Biological Sciences, 1959
A chemical and histological study has been made of the pigments of the polychaete wormChaetopterus variopedatus. The conspicuous green colour of the gut in the middle and posterior regions is due to a green pigment hitherto known as ‘chaetopterin’, which is localized in small green spherules in the gut epithelial cells.
G. Y. Kennedy, Joseph Arthur Colin Nicol
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Jaw growth and replacement in Polychaeta

Journal of Natural History, 1980
Summary Mandibles and maxillae of Australonuphis teres (family Onuphidae) continue to grow throughout life without replacement. Mandibles are solid structures that grow by external depositions, leaving a series of growth rings. Maxillae are hollow without any growth rings.
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Phylogeny and classification of Hesionidae (Polychaeta)

Zoologica Scripta, 1998
Hesionid interrelationships are assessed in a parsimony analysis of 97 (86 informative) absent/present coded morphological characters of 37 terminal taxa within the group. Character information is based on examination of available types, newly collected topotypes and additional non‐types, with introduction of many not previously recorded characters ...
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Polychaeta New to the British Isles

Nature, 1955
IN a recent survey of the littoral and sub-littoral Polychaeta of the Isle of Man, about seventy of the species found were new to the area and to the Irish Sea generally. Among these are sixteen species which do not appear to have been recorded previously from the British Isles. The new records are:
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THE HISTOLOGY OF THE BLOOD SYSTEM IN OLIGOCHAETA and POLYCHAETA

Biological Reviews, 1949
Summary1. A survey of accounts of the histology of the blood system in the various families of the Oligochaeta and Polychaeta has revealed a surprising lack of agreement among descriptions not only of the same family, but often of the same genus or species. There are several reasons for this.
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