South Australian Museum &
School of Environmental & Earth Sciences
The University of Adelaide
August 4, 2003
Pacific Forum – 2:00 p.m.
Trochophores: New ideas on the evolution and
reproduction of larval forms
theories on the ancestry and
function of larval forms of marine
invertebrates exists. Some consider the trochophore larva to be a feeding
larva with a particular anatomy that represents the ancestral larval form
for several metazoan phyla such as annelids and molluscs (=protostomes).
However, the term “trochophore” is often more broadly applied
to larvae that do not feed. The first part of this talk will be an
analysis of whether the trochophore (in a strict sense)
is a primitive form for protostomes
A classic trochophore larva
as a whole, or for smaller groups such as
The evolution of feeding larvae, in a more general sense, will also
be assessed. Greg Rouse will present support for the statements that
non-feeding larvae are in fact primitive for polychaetes and protostomes
and that feeding larvae have evolved often.
With this discovery, several problems arise regarding existing
prominent theories about animal evolution.
Understanding and using the new PhyloCode
to the frequent detection of new marine organisms, understanding and
utilizing the PhyloCode is essential for all researchers.
PhyloCode, the new code of taxonomic nomenclature, is due to begin
in 2005–and this code will either replace the Linnean system of
nomenclature or run in parallel. This
presentation will explain the features of PhyloCode and why it is more
useful for taxonomy, especially with the
description of new species. One
such species, discovered here in
Monterey Bay, will be presented with
an overview of PhyloCode.
Expedition 2002 - Raising the turret