Nototodarus
Richard E. Young and Michael VecchioneThis tree diagram shows the relationships between several groups of organisms.
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close boxIntroduction
Members of Nototodarus are demersal squid found sitting on or swimming near the ocean floor on continental or island shelves and slopes. The three recognized species are found only in the Indo-Pacific region.
Brief diagnosis:
A member of the Todarodinae with ...
- both arms IV strongly hectocotylized in males.
- Funnel groove with a foveola.
- normal trabeculate protective membranes on arms and tentacles.
Characteristics
- Arms
- Arm protective membranes and trabeculae normal.
- Both arms IV hectocotylized (see below). Right arm fully hectocotylized; left arm hectocotylized only at base.
- Arm protective membranes and trabeculae normal.
- Tentacles
- Tentacular stalks without free trabeculae.
- Largest club suckers with small, pointed teeth alternating with rectangular or broadly rounded teeth.
- Tentacular stalks without free trabeculae.
- Head
- Foveola without side pockets (Dunning and Förch, 1998).
- Foveola without side pockets (Dunning and Förch, 1998).
Comments
The hectocotylization of both arms IV is shared with Todaropsis but the latter lacks a foveola in the funnel groove.
Comparison of species
The three species of Nototodarus differ by the number of suckers on arms I (over 120 suckers in N. sloanii, 56-100 in N. gouldi, less than 60 in N. hawaiiensis) and the morphology of the distal third of the hectocotylized right arm IV.
Distribution
N. gouldi is known from continental shelf waters of Australia south of 27°S and off the northern and central coasts of New Zealand; N. sloanii is known from southern waters off New Zealand; N. Hawaiiensis has an insular distribution around various islands and seamounts in the tropical to subtropical waters of the Indo-Pacific region (Dunning and Förch, 1998).References
Dunning, M. C. and E. C. Förch. 1998. A review of the systematics, istribution, and biology of arrow squids of the genus Nototodarus Pfefer, 1912 (Cephalopoda: Ommastrephidae). Smithsonian Contributions to Zoology, No. 586: 393-404.
About This Page
University of Hawaii, Honolulu, HI, USA
National Museum of Natural History, Washington, D. C. , USA
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- First online 29 November 2009
- Content changed 29 August 2016
Citing this page:
Young, Richard E. and Michael Vecchione. 2016. Nototodarus http://tolweb.org/Nototodarus/19938/2016.08.29 in The Tree of Life Web Project, http://tolweb.org/
. Version 29 August 2016 (under construction).- View previous versions of this page
- Nototodarus Version 29 November 2009 (under construction) see full version history