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Egea Joubin, 1933

Egea inermis Joubin, 1933

Richard E. Young and Katharina M. Mangold (1922-2003)
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Egea contains one recognized species. Voss, et al. (1992), however, suggest that two species exist.

Containing group: Taoniinae

Introduction

These are moderately sized squid reaching 420 mm ML Nesis, (1982) and are poorly known.

Diagnosis

A taoniin ...

Characteristics

  1. Arms
    1. Arms I and II of large males with modified tips with abruptly much smaller suckers arranged in four series.
    2. Arms III of large females with terminal photophores.
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      Click on an image to view larger version & data in a new window

      Figure. E. inermis, oral views of the modified arm tips of a large male and a large female. Drawings from N. Voss, 1974 (p. 944, Figs. 2a, 2d, 2e).

  2. Tentacles
    1. Tentacular club with suckers only.
    2. Tentacular club without carpal cluster.
    3. Two series of suckers and pads on distal 3/4 of tentacular stalk.
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      Click on an image to view larger version & data in a new window

      Figure. E. inermis, male, 198 mm ML. Oral view of the tentacle. Drawing from Voss, 1974 (p. 943, Fig. 1b).


  3. Head
    1. Beaks: Descriptions can be found here: Lower beak; upper beak.

  4. Funnel
    1. Valve present.*
    2. Funnel organ with inverted V-shaped ventral pads and triangular flaps on dorsal organ.
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      Click on an image to view larger version & data in a new window
      Ventral view of funnel organ and funnel valve

      Figure. Ventral view of funnel organ and funnel valve of E. inermis, subadult male, 207 mm ML. Drawing from Voss (1980, p. 397).

  5. Mantle
    1. Tubercles absent from point of funnel-mantle fusion.

  6. Fins
    1. Anterior third or more of fin attaches to mantle.**

  7. Photophores
    1. Two ocular photophores: medial organ with narrow, crescent-shaped photogenetic region; lateral organ with narrow S-shaped photogenetic region and encircling 2/3 of lens.
    2. Photophores on tips of arms III in subadults; adults unknown.
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      Click on an image to view larger version & data in a new window
      Lateral and lateroventral views of ocular photophores

      Figure. Lateral and lateroventral views of ocular photophores of E. inermis, subadult male, 207 mm ML. Drawings from Voss (1980, p. 397).

*Unusual within subfamily; shared with Megalocranchia.
**Unusual within subfamily; shared with Teuthowenia.

Comments

Characteristics are from Voss (1980).

Life History

Two young stages have been illustrated.

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Dorsal view of paralarva
Ventral view of a juvenile

Figure. Top - Dorsal view of paralarva of E. inermis, ca. 7 mm ML. Bottom - Ventral view of a juvenile of E. inermis, ca 48 mm ML. Drawings from Voss (1980, p. 397).

Distribution

Egea inermis is distributed circumglobally in tropical waters, and extends into the Gulf of Mexico, the western North Atlantic in the Gulf Stream system and in the northwestern Pacific in the Kuroshio System (Voss, 1980).

Other Names for Egea inermis Joubin, 1933

References

Nesis, K. N. 1982/87. Abridged key to the cephalopod mollusks of the world's ocean. 385,ii pp. Light and Food Industry Publishing House, Moscow. (In Russian.). Translated into English by B. S. Levitov, ed. by L. A. Burgess (1987), Cephalopods of the world. T. F. H. Publications, Neptune City, NJ, 351pp.

Voss, N. A. 1974. A Redescription of Egea Inermis Joubin, 1933 Voss, N. A. 1980. A generic revision of the Cranchiidae (Cephalopoda; Oegopsida). Bull. Mar. Sci. 30: 365-412.

Voss, N. A. 1980. A generic revision of the Cranchiidae (Cephalopoda; Oegopsida). Bull. Mar. Sci., 30: 365-412.

Voss N. A., S. J. Stephen and Zh. Dong 1992. Family Cranchiidae Prosch, 1849. Smithson. Contr. Zool., 513: 187-210.

Title Illustrations
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Scientific Name Egea inermis
Comments Drawing slightly modified.
Reference Voss, N. A. 1974. Biological Results of the University of Miami Deep-Sea Expeditions. 109 Studies on the Cephalopod Family Cranchiidae. A Redescription of Egea Inermis Joubin, 1933. Bull. Mar. Sci. 24: 937-956.
Sex Male
View Dorsal
Size 198 mm ML
Copyright © 1974 Bulletin of Marine Science
About This Page
Drawings from N. Voss (1980) are printed with the Permission of the Bulletin of Marine Science.


University of Hawaii, Honolulu, HI, USA

Katharina M. Mangold (1922-2003)
Laboratoire Arago, Banyuls-Sur-Mer, France

Page: Tree of Life Egea Joubin, 1933. Egea inermis Joubin, 1933. Authored by Richard E. Young and Katharina M. Mangold (1922-2003). 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:

Young, Richard E. and Katharina M. Mangold (1922-2003). 2016. Egea Joubin, 1933. Egea inermis Joubin, 1933. Version 29 August 2016 (under construction). http://tolweb.org/Egea_inermis/19563/2016.08.29 in The Tree of Life Web Project, http://tolweb.org/

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