Dear Colleagues and Friends
It is my pleasure to share with you the result of a wide project on
Bivalvia phylogeny. The paper is the first part of that, dealing with
a morphological prospective of the taxon Diasoma ? Bivalvia plus
Scaphopoda.
As it is a quite big (14.5 Mb), you need to download it from the website:
http://depositfiles.com/files/kuw31w3t4
I hope you enjoy it and have wonderful holydays!
Best wished for 2010, Luiz
Abstract:
This study deals with detailed morphology and anatomy of 4 species of
Scaphopoda and 5 species of protobranch Bivalvia. Both classes are
traditionally grouped in the taxon Diasoma, which has been questioned
by different methodologies, such as molecular and developmental. This
study is developed under a phylogenetic methodology with the main
concern in performing it in an intelligible and testable methodology.
The analyzed Scaphopoda species came from the Brazilian coast and
belong to the family Dentaliidae [(1) Coccodentalium carduus; (2)
Paradentalium disparile] and Gadiliidae; [(3) Polyschides noronhensis,
n. sp. from Fernando de Noronha Archipelago; (4) Gadila braziliensis].
These species represent the main branches of the class Scaphopoda.
From protobranch bivalves, representatives of the families Solemyidae
[(5) Solemya occidentalis, from Florida; S. notialis, n. sp. from S.E.
Brazil], Nuculanidae [(6) Propeleda carpentieri from Florida], and
Nuculidae [(7) Ennucula puelcha, from south Brazil] are included.
These species represent the main branches of the basal Bivalvia. The
descriptions on the anatomy of S. occidentalis and of P. carpentieri
are published elsewhere. The remaining are included here, for which a
complete taxonomical treatment is performed. Beyond these species,
representatives of other taxa are operationally included as part of
the ingroup (indices are then shared with them), as a procedure to
test the morphological monophyly of Diasoma. These taxa are: two
lamellibranch bivalves [(8) Barbatia ? Arcidae; (9) Serratina ?
Tellinidae; both published elsewhere;, and Propilidium (10)
Patellogastropoda, and (11) Nautilus, basal Cephalopoda, based on
basal taxa. The effective outgroups are (12) Neopilina
(Monoplacophora) and (13) Hanleya (Polyplacophora). The phylogenetic
analysis based on morphology revealed that the taxon Diasoma is
supported by 14 synapomorphies, and is separated from Cyrtosoma
(Gastropoda + Cephalopoda). Although they are not the main goal of
this paper, the taxa Scaphopoda and Bivalvia are supported by 8 and by
7 synapomorphies respectively. The taxon Protobranchia resulted
paraphyletic. Both scaphopod orders resulted monophyletic. The
obtained cladogramis: ((((Coccodentalium carduus ? Paradentalium
disparile) (Polyschides noronhensis ? Gadila brasiliensis)) ((Solemya
occidentalis ? S. notialis) (Propeleda carpenteri (Ennucula puelcha
(Barbatia cancellaria ? Serratina capsoides))))) (Propilidium curumim
? Nautilus pompilius ? Lolliguncula brevis)).
--
Luiz Ricardo L. Simone, Ph.D.
Museu de Zoologia da Universidade de São Paulo
Cx. Postal 42494
04218-970, São Paulo, SP
Brazil
[log in to unmask]; [log in to unmask]
www.mz.usp.br
Curriculum:
http://lattes.cnpq.br/5020466945403853
Livro - Book:
http://www.femorale.com.br/articles/books/simone06/index.asp
http://www.usp.br/jorusp/arquivo/2006/jusp783/pag07.htm
----------------------------------------------------------------------
[log in to unmask] - a forum for informal discussions on molluscs
To leave this list, click on the following web link:
http://listserv.uga.edu/cgi-bin/wa?SUBED1=conch-l&A=1
Type your email address and name in the appropriate box and
click leave the list.
----------------------------------------------------------------------
|
