Overview
Brief Summary
Introduction
Cycloteuthids are mesopelagic squids of moderate size, the largest reaches about 60 cm ML, with a cosmopolitan distribution in tropical and subtropical waters (Nesis, 1982). In Cycloteuthis the mantle and fins are drawn-out into a slender tail. A tail is lacking in Discoteuthis and the large, oval (disc-like) combined fins extend virtually the full length of the mantle. Very little is known about the biology of any species in the family.
Brief diagnosis:
An oegopsid ...
- with triangular funnel locking-apparatus.
Source:
Tree of Life web project
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Comprehensive Description
Nomenclature
A list of all nominal genera and species in the Cycloteuthidae can be found here. The list includes the current status and type species of all genera, and the current status, type repository and type locality of all species and all pertinent references.
Source:
Tree of Life web project
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Characteristics
- Arms
- Arm suckers biserial.
- Buccal-crown connectives attach to ventral borders of Arms IV.
- Tentacles
- Tentacular club with quadraserial suckers.
- Tentacular club with quadraserial suckers.
- Funnel/mantle locking apparatus
- Funnel component with sub-triangular groove.
- Mantle component does not reach anterior mantle margin.
Figure. Ventral views of the funnel locking-apparatus of C. serventyi (left) and the two species of Discoteuthis (right).
Comments
The genera are easily separated by body and fin shape (see title illustrations). In addition the presence of a large visceral photophore only in Cycloteuthis allows genera to be separated when badly damaged.
Source:
Tree of Life web project
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Evolution and Systematics
Evolution
Discussion of Phylogenetic Relationships
The feature that unites these two genera is the similar triangular shape of the funnel locking-apparatus. Other than this unusual feature, there is little morphological evidence for their close relationship. Molecular evidence (Carlini, 1998), however, supports their close relationship.
Source:
Tree of Life web project
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Molecular Biology and Genetics
Molecular Biology
Statistics of barcoding coverage
| Specimen Records: | 6 | Public Records: | 3 |
| Specimens with Sequences: | 4 | Public Species: | 3 |
| Specimens with Barcodes: | 4 | Public BINs: | 3 |
| Species: | 4 | ||
| Species With Barcodes: | 3 | ||
© Barcode of Life Data Systems
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Barcode data
© Barcode of Life Data Systems
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Locations of barcode samples
© Barcode of Life Data Systems
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Wikipedia
Cycloteuthidae
The Cycloteuthidae are a family in the order Teuthida, comprising two genera. While physically dissimilar, molecular evidence supports the relatedness of the genera. The family is found primarily in mesopelagic tropical to subtropical waters. Cycloteuthidae are characterised by a triangular funnel locking apparatus.
Species
- Genus Cycloteuthis
- Genus Discoteuthis
The entries listed above with an asterisk (*) are questionable and need further study to determine if they are valid or synonyms.
Source:
Wikipedia
Unreviewed
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