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The Light Organs of Sepiola Atlantica and Spirula Spirula (Mollusca: Cephalopoda): Bacterial and Intrinsic Systems in The Order Sepioidea

Published online by Cambridge University Press:  11 May 2009

Peter J. Herring
Affiliation:
Institute of Oceanographic Sciences, Wormley, Surrey
Malcolm R. Clarke
Affiliation:
The Laboratory, Marine Biological Association, Citadel Hill, Plymouth
S. Von Boletzky
Affiliation:
Laboratoire Arago, Banyuls-sur-Mer, France
K. P. Ryan
Affiliation:
The Laboratory, Marine Biological Association, Citadel Hill, Plymouth

Extract

Symbiotic luminous bacteria have been described in, and cultured from, a number of species offish and cephalopod. Indeed only in these two groups are extracellular luminous bacteria believed to be utilized as a source of light (see Buchner (1965) and Herring (1978) for references). Despite several earlier investigations of such symbioses in cephalopods the bacteria in these animals have not been adequately identified, nor has the extent of their role been clarified. The ultrastructural relationships between bacteria and the tissues of the squid accessory nidamental gland have been investigated in the non-luminous species Loligo pealei (Lesueur) (Bloodgood, 1977) and Sepia officinalis L. (Van den Branden et al. 1979) but no comparative work on luminous species has been undertaken apart from that on Heteroteuthis dispar (Rüppell), whose photophore does not contain typical luminous bacteria (Dilly & Herring, 1978; cf. Leisman, Cohn & Nealson, 1980). The order Sepioidea contains five families, among which are the two families Sepiolidae and Spirulidae. Though the presence of luminous bacteria is known in some sepiolids (as well as in certain loliginids (order Teuthoidea)) some doubt remains about the source of light in the photophore of Spirula spirula Hoyle. The steady luminescence of this species has prompted speculation that bacteria may be involved (Harvey, 1952). In this paper we compare the anatomy and ultrastructure of the photophores of both Sepiola and Spirula in order to clarify some of these problems.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 1981

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