Under Construction

Sepiolida Keferstein, 1866

Michael Vecchione and Richard E. Young
Click on an image to view larger version & data in a new window
Click on an image to view larger version & data in a new window
taxon links [up-->]Sepiadariidae [up-->]Sepiolidae [down<--]Sepioidea Interpreting the tree
close box

This tree diagram shows the relationships between several groups of organisms.

The root of the current tree connects the organisms featured in this tree to their containing group and the rest of the Tree of Life. The basal branching point in the tree represents the ancestor of the other groups in the tree. This ancestor diversified over time into several descendent subgroups, which are represented as internal nodes and terminal taxa to the right.

example of a tree diagram

You can click on the root to travel down the Tree of Life all the way to the root of all Life, and you can click on the names of descendent subgroups to travel up the Tree of Life all the way to individual species.

For more information on ToL tree formatting, please see Interpreting the Tree or Classification. To learn more about phylogenetic trees, please visit our Phylogenetic Biology pages.

close box
Containing group: Sepioidea

Introduction

Members of the Sepiolida are short (mostly 2-8 cm ML), broad cephalopods with a rounded posterior mantle.

Brief diagnosis

A sepioid ...

Characteristics

  1. Head
    1. Eye pore outside of ventral eyelid.
      Click on an image to view larger version & data in a new window
      Click on an image to view larger version & data in a new window

      Figure. Lateral view of head of Rossia sp., 19 mm ML, female, preserved. Arrow points to eye pore.

  2. Mantle
    1. Dorsal margin fused to, or free, from head.
    2. Ventral mantle adductor present.
      3. Click on an image to view larger version & data in a new window
      Click on an image to view larger version & data in a new window

      Figure. Ventral view of mantle cavity of Rossia sp., preserved. Arrow points to the cut surface of the ventral mantle adductor where it had attached to the ventral mantle wall. Anteriorly the adductor muscles pass to either side of the intestine. Photograph by R. Young.

  3. Fins
    1. Fins broad (length ca. less than two times, usually equal to, individual fin width).
    2. Posterior attachment of fins broadly separated from each other.

  4. Shell
    1. Shell a thin or rudimentary gladius or absent.
Title Illustrations
Click on an image to view larger version & data in a new window
Click on an image to view larger version & data in a new window
Scientific Name Sepioloidea lineolata, Iridoteuthis iris
Copyright © 2004 Mark Noman, Thomas Burch
About This Page


National Museum of Natural History, Washington, D. C. , USA


University of Hawaii, Honolulu, HI, USA

Page: Tree of Life Sepiolida Keferstein, 1866. Authored by Michael Vecchione and Richard E. Young. The TEXT of this page is licensed under the Creative Commons Attribution-NonCommercial License - Version 3.0. Note that images and other media featured on this page are each governed by their own license, and they may or may not be available for reuse. Click on an image or a media link to access the media data window, which provides the relevant licensing information. For the general terms and conditions of ToL material reuse and redistribution, please see the Tree of Life Copyright Policies.

Citing this page:

Vecchione, Michael and Richard E. Young. 2019. Sepiolida Keferstein, 1866. Version 26 March 2019 (under construction). http://tolweb.org/Sepiolida/23872/2019.03.26 in The Tree of Life Web Project, http://tolweb.org/

edit this page
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

Sepiolida

Page Content

articles & notes

collections

people

Explore Other Groups

random page

  go to the Tree of Life home page
top