Aspects of myodocopin (Ostracoda) biology and crustacean iridescence

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Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.14/104363

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Title: Aspects of myodocopin (Ostracoda) biology and crustacean iridescence
Related: Australasian Digital Theses Program
Publisher: Australia : Macquarie University
Date: 1996
Author/Creator: Parker, Andrew Richard
Description: "October 1995"
Description: Thesis by publication.
Description: Thesis (PhD)--Macquarie University, School of Biological Sciences, 1996.
Description: Includes bibliography.
Description: General introduction -- Systematics of Cypridinidae (Ostracoda: Myodocopina) -- The trichocoel: form and function of an unusual type of sensilla present in the carapace of certain cypridinid (Myodocopina) ostracods -- Functional morphology of the myodocopin (Ostracoda) furca, sclerotized body plate and central adductor muscles -- Exoskeleton and position of the flexible setules on the myodocopin (Crustacea: Ostracoda) first antenna -- Discovery of functional iridescence and its coevolution with eyes in the phylogeny of Ostracoda (Crustacea) -- Mating behaviour in myodocopin ostracods (Crustacea): results from video recordings of a highly iridescent species of cypridinid -- Iridescence: an underestimated phenomenon in crustaceans, and its potential importance in behavioural recognition in marine environments -- General conclusions.
Description: This study describes the following discoveries I made while working on cypridinid ostracods, and subsequently other crustaceans. -- Two new cypridinid genera, Cohenia and Lowrya, containing the species C. taiti and L. kornickeri, and a new species of cypridinid, Vargula karamu, are established. The genus Cohenia bears an unusual type of sensilla, termed a trichocoel. Trichocoels may be velocity detectors, which detect either steady fluid drainage motion or acoustic motion in the surrounding water. The furca is used as a major feeding tool in scavenging cypridinids. The hard section of the dorsal body wall almost adjacent to the furca in all myodocopins is termed the sclerosome. The sclerosome provides support for certain fureal muscles, and protection for the soft body when the carapace is opened. The central adductor muscles of myodocopins, are arranged as a group of small muscles, rather than a single large muscle, allowing different areas of the anterior, ventral, and posterior carapace margins to open almost independently of each other. The sensory seta of the fifth article of the myodocopin first antenna is termed the sseta. Setules of the s-seta, and some from other long first antennal setae, have a finely ringed ultrastructure and are termed halophores. The halophores of one first antenna are collectively termed the halothalium. The grooved external surface of a halophore acts as a diffraction grating, and causes highly efficient iridescence. This iridescence is functional during courtship in at least some cypridinids. Some cypridinids copulate in a position where ventral carapace margins are juxtaposed, and anterior ends are opposite. Copulation in these ostracods is completed in about five seconds. The cypridinids have evolved with light as a major stimulus. Based on phylogenetic studies, iridescence appears to be a precursor to cypridinid bioluminescence, and the myodocopin compound eye may have evolved independently. Iridescence is widespread throughout the Crustacea, occurring as a result of external diffraction gratings, or internal multilayer reflectors.
Description: Mode of access: World Wide Web.
Description: ix, 283 leaves ill. (some col.)
Subject Keyword: Cypridinidae -- Australia
Subject Keyword: Cypridinidae -- Classification
Subject Keyword: Crustacea -- Color
Subject Keyword: Iridescence
Resource Type: Thesis PhD
Organisation: Macquarie University. School of Biological Sciences

Identifier: http://hdl.handle.net/1959.14/104363
Identifier: mq:11019
Identifier: 1435232
Language: eng
Rights: Copyright disclaimer: http://www.copyright.mq.edu.au
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