Symposium: Morph., Molecules, Evol. & Phylog. in the Polychaeta etc.

Purschke, Günter Purschke at biologie.Uni-Osnabrueck.DE
Thu Jan 31 05:15:30 EST 2002

Announcement of a symposium and call for additional contributions

Morphology, Molecules, Evolution and Phylogeny in the Polychaeta and Related Taxa

Date:	Monday, Sept. 23rd to Friday, Sept. 27th, 2002
Place:	Haus Ohrbeck, near Osnabrück (

	PD Dr. Günter Purschke, Universität Osnabrück, FB Biologie, Spezielle Zoologie, 
	49069 Osnabrück, Tel.: ++49-541-9692857, Fax: ++49-541-9692587, 
	purschke at

	Prof. Dr. T. Bartolomaeus, Universität Bielefeld, Fakultät für Biologie, 33501 
	Bielefeld, Tel.: ++49-541-1062721,
	t.bartolomaeus at

Background and aims of the symposium

The Polychaeta and Clitellata, which together constitute the Annelida, are 
one of the most significant groups of metazoans, not only because they 
are so numerous (almost 20,000 species have been described). 
Polychaetes live mainly in marine habitats: Ranging from the upper tidal 
zone into the deep sea, they demonstrate the enormous adaptability of 
the basic annelid body plan. Annelids also inhabit fresh water, and it is 
thought that terrestrial habitats were conquered at least three times 
independently, though the Clitellata are the only terrestrial group with 
major ecological relevance. The diversity of polychaetes encompasses all 
areas of their biology and is equalled or exceeded by only a few other 
taxa. Recently evidence is accumulating that even some of the groups 
formerly regarded as independent "phyla", such as the Pogonophora, 
Vestimentifera, Echiura and Myzostomida, are most probably nothing 
other than greatly modified annelids. The relationship of the Clitellata to 
the other annelids has also recently become controversial. Hence this 
group of animals as a whole is highly significant with respect to our 
understanding of fundamental questions about morphological and 
adaptive diversity, as well as clarifying evolutionary changes and 
phylogenetic relationships. In recent years a great deal has been learned 
about these animals, from morphological studies employing conventional 
and modern methods plus, increasingly and importantly, the use of 
molecular markers and computer-assisted kinship analyses. But this new 
knowledge has also raised new questions and controversies.  

	So far there has been no modern, comprehensive presentation and 
discussion of the recent research results, nor has there been a clear 
statement of the open questions and current problems in the area. This 
gap urgently needs to be filled, for the sake of both research and 
teaching. Such a summary also seems necessary in particular because 
the different research groups, as a result of the wide range of methods 
they employ, publish in extremely diverse journals. Not long ago a 
conference was held on the reproduction and development of 
polychaetes and clitellates and the publication that resulted (Westheide, 
W., Dorresteijn, A., eds: Hydrobiologia 402, 1999) provided an up-to-
date summary for these areas of research; now a similar summary is 
needed for the areas with which the symposium proposed here is to be 
concerned. One aspect of the proposed topic, ultrastructure, has for 
many years been covered by the comprehensive and much-quoted work 
"The Ultrastructure of Polychaeta" (Westheide, W., Hermans, C.O.: 
Mikrofauna Mar. 4, 1988), which resulted from a similar conference held 
in 1986. Although in many respects this publication is by no means 
outdated, it has been out of print for a considerable time, and 
furthermore it treats only the one aspect: evolution and phylogeny are 
considered only marginally if at all. Finally, during the fifteen years that 
have elapsed since that conference new morphological (e.g., confocal 
laser scanning microscopy) and molecular (e.g., DNA sequencing and 
other procedures for DNA analysis) methods have come into use. And of 
course many other new results, obtained with different methods, have 
become available since then. The overall subject area indicated by the 
title of the symposium proposed here including evolution and phylogeny 
with reference to morphological and molecular characters, is not treated 

	The meeting will be held at a site ideally suited to such relatively 
small symposia, the Haus Ohrbeck in a small town near Osnabrück called 
Georgsmarienhütte. The results presented here are to be published in a 
volume of proceedings in order to make the current state of knowledge 
and discussion available to the scientific community. In this volume the 
individual research areas are to be reviewed by specialists in those 
areas, who must of course also be capable of making clear the 
comparative aspects. In addition, a limited number of other scientists 
should be enabled to take an active part in the meeting, by contributing 
either short talks or poster demonstrations.  

Preliminary scientific program of the symposium, with schedule

Monday, 23.09.2002

08.00 - 12.00	Arrival at Haus Ohrbeck and check-in, conference office
12.15 - 13.00	Lunch
14.00 - 15.00	Opening cerimonies, welcome addresses and introduction
			of the organizers
15.00 - 15.30 	Coffee break
15.30 - 16.15 	C. Nielsen: Trochophora larvae
16.15 - 17.00 	A. Dorresteijn: Early development of Polychaeta
17.00 - 18.00 	Short communications
18.15 - 19.00 	Dinner

Tuesday, 24.09.2002
  8.00 -   9.00 	Breakfast
  9.00 -   9.45 	H. Hausen: Epidermis and chaetae
  9.45 - 10.30	G. Purschke: Sense organs
10.30 - 10.45 	Coffee break
10.45 - 11.30 	M.C.M. Müller/L. Orrhage: Nervous system
11.30 - 12.15 	A.B. Tzetlin/A. Filippova: Muscular system
12.15 - 14.00 	Lunch
14.00 - 14.45.	R.M. Rieger: Coelom
14.45 - 15.15 	Coffee break
15.15 - 16.00 	T. Bartolomaeus: Nephridia
16.00 - 16.45 	W. Westheide: Genital organs
16.45 - 17.45 	Short communications
18.15 - 19.00	Dinner
20.00		Poster session
Wednesday, 25.09.2002
  8.00 -   9.00 	Breakfast
  9.00 -   9.45 	G.W. Rouse: Spermatozoa and fertilization biology
  9.45 - 10.30 	K. Eckelbarger: Oocytes
10.30 - 10.45 	Coffee break
10.45 - 11.00 	A.B. Tzetlin/G. Purschke: Pharynx and intestine
11.30 - 12.15 	N. Dubilier: Procaryotic symbionts of Annelida
12.15 - 14.00 	Lunch
14.00 - 18.00	Mid-Conference Tour
18.15 - 19.00	Dinner

Thursday, 26.09.2002
  8.00 -   9.00 	Breakfast
  9.00 -   9.45 	E. Southward/A. Schulze: Morphology of Pogonophora
  9.45 -  10.30	R. Hessling: Echiura
10.30 - 10.45 	Coffee break
10.45 - 11.30 	I. Eeckhaut: Myzostomida
11.30 - 12.15 	G. Haszprunar: Mollusca
12.15 - 14.00 	Lunch
14.00 - 14.45	N.N.: Sipuncula
14.45 - 15.15 	Coffee break
15.15 - 16.00 	K. Halanych/S.L. Gardiner: Molecular phylogeny of Pogonophora
16.00 - 16.45 	D. McHugh: Molecular systematics of Polychaeta
16.45 - 17.30 	R.M. Kristensen/K. Worsaae: Evolution of interstitial annelids
20.00 		Conference banquet

Friday, 27.09.2002
  8.00 -   9.00 	Breakfast
  9.00 -   9.45 	K. Fauchald/G.W. Rouse: Cladistic analyses of Polychaeta
  9.45 - 10.30	C. Erséus: Molecular and cladistic analyses of oligochaetous Clitellata
10.30 - 10.45 	Coffee break
10.45 - 11.30 	M.E. Siddall: Molecular systematics of Hirudinea
11.30 - 12.15 	Check out
12.15 - 14.00 	Lunch
14.00 - 14.30	C.O. Hermans: Summary
14.45 - 15.30	Closing ceremony

General information

Address for registration:
by mail	:	PD Dr. Günter Purschke, Universität Osnabrück, FB Biologie,
		Zoologie, 49069 Osnabrück, 
e-mail:		purschke at

Deadline for registration: 30.04.2002

Conference fee: EUR 120 (including banquet, proceedings and excursion)

Payments should be made to:
PD Dr. Günter Purschke
Bank account No. 1512025386 
Bank No. 265 60105
at Sparkasse Osnabrück
Keyword: Symposium Ohrbeck

Additional information will be given whether payment by credit card can be

Accomodation available at Haus Ohrbeck only from Monday, 23rd to Friday,
27th 2002
Double room:	EUR 180 per Person including 4 meals/day
Single room:	EUR 200 per Person including 4 meals/day

For additional nights please contact:
Informations- and Reservierungssystem Osnabrücker Land

Postal address: 
Tourismusverband Osnabrücker Land e.V.
Am Schölerberg 6
49082 Osnabrück
Tel.: ++49-541-9511195
e-mail: tv at

then go to: 
*	"Ihre Unterkunft - Information + Buchung"
*	- "Hotels, Gasthöfe, Pensionen"
*	- "Osnabrück"
*	 "Information und Buchung"
*	- "Buchungsanfrage über Internet"
*	- then fill in the form (Buchungsnummer refers to the hotel chosen)

then go to: 
*	Tourismus & Verkehr (left side of the page)
*	Osnabrücker Hotels
*	Übersichtsplan
*	click on the yellow numbers (they will show you the price)
*	go back to the last page
*	click on "Klicken Sie hier um online zu buchen!"(you can book online

Your way to Osnabrück:
*	If you travel by plane the most convenient airport might be
Frankfurt/Main because most international flights come in via Frankfurt and
there is a long distance train station directly beneath the airport. From
there a train leaves for Osnabrück every hour. The current time tables are
available at the internet:
A second possibility is the airport Münster/Osnabrück (FMO) with a number of
national and international destinations or connecting flights. From the
airport - about 40 km from the City of Osnabrück - you may take a shuttle
bus to Osnabrück.
*	If you travel by car: 
You should leave the motorway A1 (Autobahn) at exit Autobahnkreuz
Lotte/Osnabrück, take the motorway A30 towards Hannover and leave at exit
Osnabrück-Sutthausen. Then go towards Hagen a.T.W., after roughly 3 km you
will find Haus Ohrbeck on the right hand side. 
*	If you travel by train:
You should leave the train at Osnabrück Hauptbahnhof (main station), then
take a taxi or take the bus line 61 or 62 (platform 1) to Neumarkt, then get
on the bus 471-473 towards Holzhausen (platform C) and get off the bus at
"Kloster Ohrbeck". 

If you have any difficulties with travel arrangements we will be please to
help you.

This information will also be given on the internet:

PD Dr. Guenter Purschke
AG Spezielle Zoologie
Fachbereich Biologie/Chemie
Universitaet Osnabrueck
D-49069 Osnabrück
Tel. +0541-969-2857
Fax. +0541-969-2587
purschke at

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