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Books > Science & Mathematics > Biology, life sciences > Cellular biology
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Annelida Basal Groups and Pleistoannelida, Sedentaria I (Hardcover)
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Annelida Basal Groups and Pleistoannelida, Sedentaria I (Hardcover)
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This book is the first in a series of 4 volumes in the Handbook of
Zoology series about morphology, anatomy, reproduction,
development, ecology, phylogeny and systematics of Annelida. This
first volume covers members of the so-called basal radiation and
the first part of Sedentaria. It is supplemented by chapters on the
history of annelid research, their fossil record, and an
introduction to the phylogeny of annelids and their position in the
tree of life. In the latter chapter the history of their systematic
is reviewed giving an almost complete picture of
systematic-scientific progress especially in the past years which
changed our view on annelid phylogeny dramatically. The most basal
annelids, lately united as Palaeoannelida, represent two families
of aberrant polychaetes formerly often suggested to be highly
derived which now give us a fresh look on how the ancestral annelid
may have looked like. These lack certain key characters such as
nuchal organs and possess rather simple nervous systems which now
likely represent primitive character states. In this basal
radiation the first taxon of apparently unsegmented and
achaetigerous animals is positioned, the Sipuncula. Most likely
another group of platyhelminth-like and unsegmented and even
chaeta-lees annelids, Lobatocerebridae falls into this basal
radiation. The section of Sedentaria starts with Orbiniida, a taxon
characterized by elongated, thread-like worms which do not have
anterior appendages like palps and comprises several families
representing members of the Meiofauna. These minute worms often
inhabiting the interstitial spaces in marine sands are suggested to
have evolved by progenesis. The second higher taxon is represented
by Cirratuliformia comprising nine families of typical sedentary
polychaetes each of which showing a remarkable variation of the
annelid body plan. Members of this taxon usually exhibit many
annelid characters but certain also lack the most typical
prostomial appendages, the palps.
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