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Taxonomy and Phylogeny of Australian Cubozoa

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Taxonomy and Phylogeny of Australian Cubozoa ResearchOnline@JCU This file is part of the following reference: Gershwin, Lisa-ann (2005) Taxonomy and phylogeny of Australian cubozoa. PhD thesis, James Cook University. Access to this file is available from: http://eprints.jcu.edu.au/27395/ If you believe that this work constitutes a copyright infringement, please contact [email protected] and quote http://eprints.jcu.edu.au/27395/ TAXONOMY AND PHYLOGENY OF AUSTRALIAN CUBOZOA e 2004 03 2004 e e 2004 04 v v Alatina mordens 2003 26 Go B . B Go . Alatina mordens 2003 25 A NQLD 2003 32 2003 NQLD A A NQLD AF358103 . us sp us us sp i AF358104 i er us sp . A NQLD 2003 33 us sp us k us sp x Darwin 2004 01 2004 Darwin x Unkno flec x i 2003 04 2003 i A NQLD 2003 08 Chiropsalm . Chiropsalm er k us sp wn 2003 19 ChiropsalmChiropsalm x flec x Chirone Chiropsalm Chiropsalm Chirone Chirone Unknown 2003 20 Carybdea marsupialis AF358106 wn 2004 14 o T Pseudo-Ir own 2004 13 astonii 2004 11 Pseudo-Ir ukandji Hore6 2004 26 ybdea nsp Cape astonii 2004 10 ukandji P ybdeaybdea r nsp CapeT apan 2004 18 Car ybdea r astonii J Broome Ir CarCarCar ybdea r or Car t 2004 16 Carybdea rastonii 2004 12 ukandji juv 2004 22 Car Car ybdea r Car T Car Car CarCar Pseudo-Ir Car r ybdea r astonii J ukandji Hore5 2004 24 cystophor ipedalia ybdea xa ybdea xa ybdea xa apan 2004 19 ybdea sivic ybdea xa ybdea sivic ybdea astonii AF358108 ukandji 2003 14 ymacana Pseudo-Ir ymacana AF358109 ymacana ymacana ukandji large 2004 21 W kisi SA 2004 17 kisi AF358110 kisi A 2004 07 Broome Ir a L10829 a y 2004 08 W W ka ybdeid AF358105 A 2004 05 nesi AF358107 A 2004 06 Car nesi 2003 11 Morbakka Mac Darwin car ukia bar sivic ybdea Car 03 2003 nesi ukia bar Car kisi AIMS kisi ukia bar ukia ukia nsp Broome 2004 23 Car Car Thesis submitted by Lisa-ann GERSHWIN, BSc (Honors) California in April 2005 for the degree of Doctor of Philosophy in Marine Biology within the School of Marine Biology and Aquaculture James Cook University STATEMENT OF ACCESS I, the undersigned, the author of this thesis, understand that James Cook University will make this thesis available for use within the University Library and, via the Australian Digital Theses network (unless granted an exemption), for use elsewhere. I understand that, as an unpublished work, a thesis has significant protection under the Copyright Act and; All users consulting this thesis will have to sign the following statement: In consulting this thesis I agree not to copy or closely paraphrase it in whole or in part without the written consent of the author; and to make proper public written acknowledgment for any assistance which I have obtained from it. Because of the taxonomic changes made in this thesis, and the nomenclatural implications if the names are applied prior to proper publication, I wish this work to be embargoed until 31 December 2006, after which I do not wish to place any further restriction on access to this work. _________________________________________ ____________________ Lisa-ann Gershwin i ABSTRACT Jellyfishes in the class Cubozoa are species rich and often abundant in Australian waters. They are geographically widespread in tropical and temperate waters and they have global significance both economically and recreationally as dangerous marine stingers. They are interesting evolutionarily and with respect to ecology and life history. Despite this, the taxonomy of cubozoans is too coarse to allow discrimination of closely related species, hindering further advances in all aspects of cubozoan biology. The objectives of this thesis were to revise the taxonomy of the Cubozoa based on structural characters, and to elucidate the evolutionary relationships of cubozoan species based on qualitative comparison of morphological and molecular phylogenetic analyses. I present a detailed historical and contemporary review of 85 morphological characters, many of which have not been previously used. These include (where possible) nematocysts and statoliths (balance stones), that allow the identification of ethanol-preserved specimens, frozen- defrosted material, fragmented or badly damaged samples, and possibly even fossil species. Additional characters that give increased taxonomic resolution include apical decorations, pedalial keel ratios and armament, pedalial canal shape and branching, tentacle decorations and banding forms, phacellae branching and cirri length, rhopalial horns and windows, number of eyes, frenulae, perradial lappets, velarial armament, lips shape, and a new approach to interpreting mesenteries. Accurate identification of cubozoans is based on many morphological characters. There is no small set of characters that can be universally compared to identify taxa with high reliability, but rather, different sets of characters are reliable for different groups and at different levels. For example, the historical split of the chirodropids (with gastric saccules) from the carybdeids (without gastric saccules) is no longer accurate; the undescribed spotted chirodropid (Chirodropus sp. A) lacks gastric saccules. Similarly, rhopaliar niche ostium shape and direction of phacellae work well for separating many (but not all) families of carybdeids, but are uniform in the chirodropids. The synoptic identification tools presented in this thesis will allow for reasonably reliable identification for the species herein, being mindful of preservational distortions, ontogenetic character changes, biological variation, and unrealized species. I recommend the use of the full range of characters presented in this study for identification and recognition of new species and species outside Australian waters. Phylogenetic relationships within the Cubozoa were inferred by comparing parsimony analysis of 31 species scored for 85 morphological characters against Bayesian maximum likelihood analysis of partial 18S rDNA sequences from 42 individuals representing 13-16 species. Numerous patterns are congruent and well supported in both data sets as follows: ii separation of the “Carybdea alata” species complex from the other Carybdea spp., a grouping of Carybdea sivickisi with Tripedalia spp., and monophyly of the Chirodropida. Furthermore, there were three distinct groups of highly toxic jellyfish whose stings result in Irukandji syndrome; although differences exist between the morphological and molecular tree topologies, there was nonetheless strong support for a clade herein referred to by the non-taxonomic common designation “Irukandjiidae”. Based on the combination of morphological and molecular phylogenetic analyses, numerous changes to the existing taxonomic framework were indicated. A revised classification is proposed, along with synopses of the species and a dichotomous key to taxa collected in Australian waters. Furthermore, a new family is proposed, the Alatinidae, with detailed descriptions of a new genus, Alatina, and two new species, A. mordens and A. rainensis. Other new taxa are indicated throughout the text, but will be fully treated in a monographic revision of the Cubozoa generated from this work. Practical application of these results has already begun. The Irukandji clade identified in this study contains at least two assemblages of medical interest, the Carukia spp. and the “Pseudo-Irukandji” group. Species from each of these sub-clades have been associated with Irukandji syndrome, the latter linked with a fatal sting event. These two groups are further sorted on numerous macro-morphological features, cnidomes, statoliths, behavioural patterns, and spatio-temporal distribution, and there is some indication that syndrome severity may sort along phylogenetic lines. The link between these species and symptoms remains to be conclusively shown, but the correlative evidence suggests it should be an active area of research. This study covers new ground in many respects, including detailed examination of a wide range of morphological characters and production of comparable robust phylogenies from molecular and morphological data sets. A sound taxonomy is required as the basis for communication and comparison in all other types of cubozoan studies, such as ecology, toxinology, and basic biology, all of which will, in turn, be necessary for the successful management of Australia’s jellyfish problem. iii TABLE OF CONTENTS Statement of access ........................................................................................................................ i Abstract ......................................................................................................................................... ii Table of contents.......................................................................................................................... iv List of figures.............................................................................................................................. vii List of tables...............................................................................................................................viii List of plates................................................................................................................................. ix Statement of sources .................................................................................................................... xi Acknowledgments....................................................................................................................... xii Dedication .................................................................................................................................
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