Porifera is traditionally viewed as monophyletic, yet recent molecular data indicate it may be
paraphyletic or even polyphyletic. In this study full-length l8S rRNA sequences were
derived from two hexactinellid sponges (Class Hexactinellida), four demosponges (Class
Demospongiae) and one calcareous sponge (Class Calcarea), in order to test the evolutionary
hypotheses of relationship between them, and ultimately, to test the monophyly of Porifera.
Phylogenetic analyses yielded congruent polyphyletic topologies with Demospongiae and
Hexactinellida, forming a well-supported clade, which excluded the Calcarea. The Calcarea
was hypothesised to be more closely related to other diploblasts, forming a clade with the
comb-jellies (Phylum Ctenophora). The Kishino-Hasegawa test was applied to explore
alternative evolutionary relationships between the sponge classes. Constraining the Calcarea
as sister taxon to either Demospongiae or Hexactinellida was rejected in this test, although a
monophyletic sponge phylum could not be rejected using this dataset.
Member of
Contributors
Publisher
Queensland Museum
Date Issued
1999
Note
Language
Type
Genre
Form
Extent
12 p.
Subject (Topical)
Identifier
FA00007272
Additional Information
Porifera is traditionally viewed as monophyletic, yet recent molecular data indicate it may be
paraphyletic or even polyphyletic. In this study full-length l8S rRNA sequences were
derived from two hexactinellid sponges (Class Hexactinellida), four demosponges (Class
Demospongiae) and one calcareous sponge (Class Calcarea), in order to test the evolutionary
hypotheses of relationship between them, and ultimately, to test the monophyly of Porifera.
Phylogenetic analyses yielded congruent polyphyletic topologies with Demospongiae and
Hexactinellida, forming a well-supported clade, which excluded the Calcarea. The Calcarea
was hypothesised to be more closely related to other diploblasts, forming a clade with the
comb-jellies (Phylum Ctenophora). The Kishino-Hasegawa test was applied to explore
alternative evolutionary relationships between the sponge classes. Constraining the Calcarea
as sister taxon to either Demospongiae or Hexactinellida was rejected in this test, although a
monophyletic sponge phylum could not be rejected using this dataset.
paraphyletic or even polyphyletic. In this study full-length l8S rRNA sequences were
derived from two hexactinellid sponges (Class Hexactinellida), four demosponges (Class
Demospongiae) and one calcareous sponge (Class Calcarea), in order to test the evolutionary
hypotheses of relationship between them, and ultimately, to test the monophyly of Porifera.
Phylogenetic analyses yielded congruent polyphyletic topologies with Demospongiae and
Hexactinellida, forming a well-supported clade, which excluded the Calcarea. The Calcarea
was hypothesised to be more closely related to other diploblasts, forming a clade with the
comb-jellies (Phylum Ctenophora). The Kishino-Hasegawa test was applied to explore
alternative evolutionary relationships between the sponge classes. Constraining the Calcarea
as sister taxon to either Demospongiae or Hexactinellida was rejected in this test, although a
monophyletic sponge phylum could not be rejected using this dataset.
Florida Atlantic University. Harbor Branch Oceanographic Institute contribution 1282
This manuscript is an author version with the final publication
available and may be cited as: Adams, C.L., McInerney, J.O., & Kelly, M. (1999). Indications of
relationships between poriferan classes using full-length 18S rRNA gene sequences. Memoirs of the
Queensland Museum, 44, 33-43.
available and may be cited as: Adams, C.L., McInerney, J.O., & Kelly, M. (1999). Indications of
relationships between poriferan classes using full-length 18S rRNA gene sequences. Memoirs of the
Queensland Museum, 44, 33-43.
Date Backup
1999
Date Text
1999
Date Issued (EDTF)
1999
Extension
FAU
IID
FA00007272
Organizations
Attributed name: Kelly-Borges, M.
Attributed name: Harbor Branch Oceanographic Institute
Person Preferred Name
Adams, Christi L.
Physical Description
12 p.
Title Plain
Indications ofrelationships between poriferan classes using full-length 18S rRNA gene sequences
Origin Information
1999
Queensland Museum
Brisbane
Place
Brisbane
Title
Indications ofrelationships between poriferan classes using full-length 18S rRNA gene sequences
Other Title Info
Indications ofrelationships between poriferan classes using full-length 18S rRNA gene sequences