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Symmoriiformes is an
extinct order of stem-group holocephalians.
Originally named Symmoriida by
Zangerl (1981), it has
subsequently been
known by
several other names...
- Elasmobranchii.
Stethacanthus has been
further classified as part of the
order Symmoriida, a
classification that has
sparked a controversy.
There are two main hypotheses...
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Squatiniformes (Angelsharks) †
Cladoselachiformes †
Hybodontiformes †
Symmoriida †
Xenacanthida (Xenacantiformes) List of
sharks Human interaction Shark...
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Squatiniformes (Angelsharks) †
Cladoselachiformes †
Hybodontiformes †
Symmoriida †
Xenacanthida (Xenacantiformes) List of
sharks Human interaction Shark...
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large upturned pectoral fins, and club-like tails. †Debeeriiformes †
Symmoriida Symmoriids Zangerl, 1981 (sensu Maisey, 2007) 4
Members of the holocephali...
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Squatiniformes (Angelsharks) †
Cladoselachiformes †
Hybodontiformes †
Symmoriida †
Xenacanthida (Xenacantiformes) List of
sharks Human interaction Shark...
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Cladoselachidae is in turn
sister to the
clade containing Holocephali and
Symmoriida. The
results of
their phylogenetic analyses are
shown in the cladogram...
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around 6–9
meters (20–30 feet).
Other fish had
piercing teeth, such as the
Symmoriida; some, the petalodonts, had
peculiar cycloid cutting teeth. Most of the...
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other marine organisms.
Other sharks had
piercing teeth, such as the
Symmoriida; some, the petalodonts, had
peculiar cycloid cutting teeth. Most of the...
- is
divided into the
following taxa: Cladoselache, Eugeneodontiformes,
Symmoriida, Xenacanthiformes, Ctenacanthiformes, Hybodontiformes, Galeomorphii, Squaliformes...
