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.

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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.

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Characteristics

  1. Arms
    1. Arm suckers biserial.
    2. Buccal-crown connectives attach to ventral borders of Arms IV.

  2. Tentacles
    1. Tentacular club with quadraserial suckers.

  3. Funnel/mantle locking apparatus
    1. Funnel component with sub-triangular groove.
    2. 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.

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Evolution and Systematics

Evolution

Discussion of Phylogenetic Relationships

View Cycloteuthidae Tree

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.

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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage

Barcode of Life Data Systems (BOLD) Stats
Specimen Records: 6
Specimens with Sequences: 4
Specimens with Barcodes: 4
Species: 4
Species With Barcodes: 3
Public Records: 3
Public Species: 3
Public BINs: 3
Creative Commons Attribution 3.0 (CC BY 3.0)

© Barcode of Life Data Systems

Source: Barcode of Life Data Systems (BOLD)

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Barcode data

Creative Commons Attribution 3.0 (CC BY 3.0)

© Barcode of Life Data Systems

Source: Barcode of Life Data Systems (BOLD)

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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[edit]

The entries listed above with an asterisk (*) are questionable and need further study to determine if they are valid or synonyms.

Creative Commons Attribution Share Alike 3.0 (CC BY-SA 3.0)

Source: Wikipedia

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