Intro | Search taxa | Taxon tree | Sources | Webservice | Statistics | Editors | Log in

RAS source details

Kroh, A. & Smith, A.B. (2010): The phylogeny and classification of post-Palaeozoic echinoids. Journal of Systematic Palaeontology, 8/2: 147-212.
Kroh, A.; Smith, A. B.
The phylogeny and classification of post-Palaeozoic echinoids
Journal of Systematic Palaeontology
8(2): 147-212
The relationships of post-Palaeozoic echinoids at family level are established through phylogenetic analysis of 169 taxa and 306 skeletal characters (excluding pedicellariae). Previous phylogenetic analyses of echinoids have either examined specific subgroups in detail or have looked at a relatively small number of taxa selected from across the class, with sparse sampling potentially affecting the reliability of results adversely. Our new analyses represent a compromise between encompassing the diversity of form that exists, while keeping the number of taxa to a level that does not make rigorous analysis impossibly time-consuming. In constructing the taxon-character data matrix we have encountered a surprising lack of primary data on plating pattern, lantern, and girdle structure for many supposedly “well-known” taxa. A well-resolved phylogenetic hypothesis was obtained and is used as the basis for a formal classification. Characters generally have a high retention index (>0.7) but low consistency index (<0.25) suggesting that, although characters are largely retained after they first evolve, most also undergo occasional reversal or convergence. Although parts of the resulting trees are only weakly supported (e.g. the precise sister group of the Irregularia), other parts are unambiguously resolved. Not unexpectedly, deep nodes are often not supported by unique apomorphies and higher taxa acquire their characteristic set of features over time. Diagnoses based on crown group taxa thus often fail to encompass fossil stem-group members adequately. Establishing the relationships of taxa at the root of large groups is hampered by limited character resolution. The influence of fossil taxa on the topology was explored by comparing the tree topologies obtained with and without their inclusion. We show that removal of fossils from stem groups makes no difference where their crown group is morphologically conservative, but has a major influence where extant sister groups are separated by large morphological gaps. Completeness of the echinoid record and its match to the stratigraphical record of first occurrences is tested using various metrics and found to be highly congruent, with irregular echinoids showing a higher congruence than regular ones. Keywords: Echinoids; phylogeny; cladistics; evolution; classification
RIS (EndNote, Reference Manager, ProCite, RefWorks)
BibTex (BibDesk, LaTeX)
2013-01-12 18:30:12Z

Acroechinoidea (basis of record)
Arbaciidae Gray, 1855 (additional source)
Arbacioida (additional source)
Atelostomata (basis of record)
Aulodonta (basis of record)
Brisasterinae Markov, 1994 accepted as Schizasteridae Lambert, 1905 (basis of record)
Camarodonta (basis of record)
Carinacea (basis of record)
Cidaridae Gray, 1825 (additional source)
Cidaridea Gray, 1825 accepted as Cidaroidea Gray, 1825 (basis of record)
Cidaroida (additional source)
Cidaroidea (basis of record)
Ctenocidaridae Mortensen, 1928 (basis of record)
Diadematacea (basis of record)
Echinacea (basis of record)
Echinidae Gray, 1825 (additional source)
Echinidea (basis of record)
Echinoidea (additional source)
Echinothuriidae Thomson, 1872 (basis of record)
Echinothurioida (basis of record)
Euechinoidea (basis of record)
Goniocidarinae Mortensen, 1928 (basis of record)
Hemiasteridae H.L. Clark, 1917 (additional source)
Holasteroida (basis of record)
Holasteroida incertae sedis (basis of record)
Irregularia (basis of record)
Kamptosomatidae Mortensen, 1934 (basis of record)
Meridosternata (basis of record)
Paleopneustidae A. Agassiz, 1904 (basis of record)
Paleopneustidea A. Agassiz, 1904 accepted as Paleopneustoidea A. Agassiz, 1904 (basis of record)
Paleopneustina (basis of record)
Paleopneustina incertae sedis A (basis of record)
Paleopneustina incertae sedis B (basis of record)
Parechinidae Mortensen, 1903 (basis of record)
Plexechinidae Mooi & David, 1996 (additional source)
Pourtalesiidae A. Agassiz, 1881 (additional source)
Prenasteridae Lambert, 1905 (basis of record)
Schizasteridae Lambert, 1905 (additional source)
Spatangoida (additional source)
Temnopleuridae A. Agassiz, 1872 (additional source)
Temnopleuridea (basis of record)
Urechinidae Duncan, 1889 (additional source)
Urechinina (basis of record)
This service is powered by LifeWatch Belgium
Learn more»
Website and databases developed and hosted by VLIZ · Page generated 2024-05-23 · contact: Anton Van de Putte