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New lit.: Siboglinidae cladistics

Geoff Read g.read at niwa.cri.nz
Thu May 24 18:01:56 EST 2001

Rouse, Greg W. 2001. A cladistic analysis of Siboglinidae Caullery, 1914 
(Polychaeta, Annelida): formerly the phyla Pogonophora and Vestimentifera. 
 - Zoological Journal of the Linnean Society of London 132(1):55-80. 

"It has been proposed in recent years that the phyla Pogonophora and 
Vestimentifera are a derived clade of polychaete annelids. It has also 
been proposed that if this clade belongs among polychaetes, then the 
taxon name Pogonophora is misleading and should revert to a name 
first formulated for the group, Siboglinidae Caullery, 1914. This 
recommendation is adopted in this paper, and a cladistic study using 
terminals of «generic» rank in the former Pogonophora (including 
Vestimentifera) is undertaken. The purpose of this is to assess which 
taxon names should now be used for clades within Siboglinidae, and 
to provide a revised taxonomy, based on phylogenetic principles. 
Another major aim is to assess the position of the vestimentiferan 
clade within Siboglinidae. The results show that Vestimentifera is 
the sister group to Sclerolinum, and this clade is then sister group to 
Frenulata, i.e. the remaining Siboglinidae. The results suggest that all 
taxa within Siboglinidae that are not genera or species are redundant, 
except for the following: Siboglinidae is defined as the first 
polychaete, and all its descendants, to have an gut occluded by 
expanded endoderm filled with chemoautotrophic bacteria, as seen in 
the holotype of Riftia pachyptila Jones, 1981. Monilifera can be 
defined based on apomorphy-based system such that it is the first 
siboglinid, and all its descendants, to have rings of chaetae (uncini) 
in the opisthosoma, as seen in the holotype of Sclerolinum 
magdalenae Southward, 1972. Vestimentifera can be defined as the 
first siboglinid and all its descendants to have a vestimentum as seen 
in the holotype of Riftia pachyptia. Frenulata is defined as the 
siboglinid, and all its descendants, to have a mid-trunk girdle, as 
seen in the holotype of Siboglinum weberi Caullery, 1914. The taxa 
of generic rank are not defined here since their monophyly was not 


  Geoff Read <g.read at niwa.cri.nz>

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