go to the Tree of Life home page
advanced
Under Construction
This is an archived version of a Tree of Life page. For up-to-date information, please refer to the current version of this page.

Luteuthis O'Shea 1999

Richard E. Young and Michael Vecchione
The genus contains a two poorly-known species.
Containing group: Opisthoteuthidae

Introduction

Luteuthis spp. are very fragile, gelatinous, presumably pelagic cirrate octopods whose affinities are uncertain (see Nomenclature) The two species in this genus are known from only three specimens.

Diagnosis

Opisthoteuthids ...

Characteristics

  1. Shell
    1. W-shaped.
    2. Basal shelf deflected beneath saddle.
    3. Lateral wings with keeled, in some species, inrolled margins.
     image info

    Figure. Ventral and posterior views of shell of L. shuichi. Photograph from O'Shea and Lu, 2002.

  2. Arms and web
    1. Sucker enlargement in males undetermined.
    2. Sucker apperature crenulate with tooth-like structures.
    3. First cirri between suckers 4 and 6.
    4. Cirri short; maximum length comparable to half of largest sucker diameter.
    5. Web nodules absent.
     image info

    Figure. Side and oral view of cut suckers showing tooth-like structures of L. dentatus. Drawing from O'Shea, 1999.

  3. Pigmentation
    1. No areolar spots.

  4. Gills
    1. Half-orange appearance.

  5. Digestive system
    1. Intestine shorter than or approximately equal to esophagus (including crop) in length.
    2. Digestive gland bilobed.
    3. Radula present.
     image info

    Figure. Side view of the igestive system of L. dentatus. Drawing from O'Shea, 1999.

  6. Reproductive system
    1. Male with linear arrangement of accessory glands.
    2. Penis well developed.

  7. Optic lobe
    1. Circular in cross-section
    2. Single optic bundle penetrates the white body.
     image info

    Figure. Digestive system of L. dentatus. Drawing from O'Shea, 1999.

Comments

The two distinctive features of Luteuthis are the tooth-like structures on the suckers and the shape of the shell.

Nomenclature

The genus Luteuthis was established by O'Shea (1999) and placed in its own family, the Luteuthidae. O'Shea and Lu (2002) state that the family is distinguished by the following features:

The presence of a radula is now known be we widely distributed in the Grimpoteuthis. The W-shaped shell is unusual but an intermediate condition is seen in Grimpoteuthis tuftsiGrimpoteuthis). (O'Shea and Lu, 2002, consider this species to be in the Luteuthidae but Collins, in press, considers it a typical The peculiar suckers appears to be a unique feature. The arrangement of accessory glands needs further evaluation. The arrangement of glands is unknown in many species and where known the clear arrangement of the parts and, indeed, their proper identification is often unclear.

We suggest that placing Luteuthis in its own family is premature at present.

References

O'Shea, S. 1999. The marine fauna of New Zealand: Octopoda (Mollusca: Cephalopoda). NIWA Biodiversity Memoir 112: 280pp.

O'Shea, S. and C. C. Lu. 2002. A New Species of Luteuthis (Mollusca: Cephalopoda: Cirroctopoda) from the South China Sea. Zoological Studies, 41: 119-126.

Title Illustrations
Scientific Name Luteuthis shuichi
Reference O'Shea, S. and C. C. Lu. 2002. A New Species of Luteuthis (Mollusca: Cephalopoda: Cirroctopoda) from the South China Sea. Zoological Studies, 41: 119-126.
View Side
Type Holotype
Copyright © 2002 S. O'Shea and C.C. Lu
About This Page

Richard E. Young

Dept of Oceanography
University of Hawaii
Honolulu, Hawaii 96822
USA



National Marine Fisheries Service
Systematics Laboratory
National Museum of Natural History
Washington, D. C. 20560
USA

Citing this page:

Young, Richard E. and Vecchione, Michael. 2003. Luteuthis O'Shea 1999. Version 13 May 2003 (under construction). http://tolweb.org/Luteuthis/20105/2003.05.13 in The Tree of Life Web Project, http://tolweb.org/

close box

This page is a Tree of Life Branch Page.

Each ToL branch page provides a synopsis of the characteristics of a group of organisms representing a branch of the Tree of Life. The major distinction between a branch and a leaf of the Tree of Life is that each branch can be further subdivided into descendent branches, that is, subgroups representing distinct genetic lineages.

For a more detailed explanation of the different ToL page types, have a look at the Structure of the Tree of Life page.

close box

Luteuthis

Page Content

Articles

Notes

Treehouses

Explore Other Groups

random page

top