Species delimitation and distribution in Aporometra (Crinoidea : Echinodermata): endemic Australian featherstars
Lauren E. Helgen A C and Greg W. Rouse A BA School of Earth and Environmental Sciences, University of Adelaide, Adelaide, SA 5005 Australia.
B South Australian Museum, North Terrace, Adelaide, SA 5000 Australia.
C Corresponding author. Email: lauren.helgen@gmail.com
Invertebrate Systematics 20(3) 395-414 https://doi.org/10.1071/IS05050
Submitted: 17 October 2005 Accepted: 24 March 2006 Published: 20 June 2006
Abstract
Aporometra Clark, 1938, which belongs to the monotypic Aporometridae, is a crinoid genus endemic to temperate Australian waters. It has been described as being ‘viviparous’ and is among the smallest of comatulids. The small size of specimens, and poor morphological justifications for specific diagnoses have created uncertainty over the number of species in the genus and their distributions. This study identified a suite of characters using data from scanning electron microscopy and mtDNA sequencing (CO1 and ND2) to assess the number of species of Aporometra. Specimens were obtained from museums and collected from Western Australia, South Australia, Victoria and New South Wales. Type material was also examined when possible. Phylogenetic hypotheses were generated using maximum parsimony-based analyses of the separate and combined datasets. The results support the monophyly of Aporometra and the presence of two species, Aporometra wilsoni (Bell, 1888) and Aporometra occidentalis A. H. Clark, 1938, along the southern Australian coast. The status of the third nominal species, Aporometra paedophora (H. L. Clark, 1909), remains to be resolved, but it may be a junior synonym of A. wilsoni. Morphological diagnoses are reviewed. Aporometra occidentalis was only found in Western Australia, while A. wilsoni was found from Western Australia to Victoria. Phylogeographic differentiation between the western and southern populations of A. wilsoni is briefly discussed.
Acknowledgments
We are grateful to Helen Tassie who first alerted us to a population of Aporometra near Adelaide and allowed this project to start. We would like to thank Thierry Laperousaz (SAM), Michelle Stuckey, Tim O’Hara (MV) and Jane Fromont (WAM) for providing specimens for the study; Penny Berents (AM), and Fred Collier (MCZ) for kindly loaning type specimens and Rich Mooi (CAS) for the loan of Notocrinus specimens. Andrea Scouras and Teena Browning helped with primers for this study. We would also like to thank the staff at Adelaide Microscopy, the SAM Evolutionary Biology Unit, Steve Donnellan, Kristofer Helgen, Nerida Wilson and the Johnston family for their assistance. We thank Charles Messing and Tim O’Hara for insightful reviews that improved this manuscript. This work was funded by the Australian Biological Resources Survey, Australian Research Council and Friends of the South Australian Museum.
Bell F. J.
(1888) Report on Echinoderms collected from Port Phillip by Mr. J. Bracebridge. Annals and Magazine of Natural History Sixth Series 2, 401–407.
Bennett I., Pope E. C.
(1953) Intertidal zonation of the exposed rocky shores of Victoria, together with a rearrangement of the biogeographical provinces of temperate Australian shores. Australian Journal of Marine and Freshwater Research 4, 105–159.
| Crossref | GoogleScholarGoogle Scholar |
Clark A. H.
(1909) The recent crinoids of Australia. Australian Museum Memoir IV, 703–804.
Clark A. H.
(1911) Crinoidea. Die Fauna Südwest-Australiens 3, 461–463.
Clark A. H.
(1915) A monograph of the existing crinoids. Volume 1, Part 1. United States National Museum Bulletin 82, 1–406.
Clark A. H.
(1921) A monograph of the existing crinoids. Volume 1, Part 2. United States National Museum Bulletin 82, 1–795.
Clark A. H.
(1931) A monograph of the existing crinoids. Volume 1, Part 3. United States National Museum Bulletin 82, 1–816.
Clark A. H.
(1941) A monograph of the existing crinoids. Volume 1, Part 4a. United States National Museum Bulletin 82, 1–603.
Clark A. H.
(1947) A monograph of the existing crinoids. Volume 1, Part 4b. United States National Museum Bulletin 82, 1–473.
Clark A. H.
(1950) A monograph of the existing crinoids. Volume 1, Part 4c. United States National Museum Bulletin 82, 1–383.
Clark A. H., Clark A. M.
(1967) A monograph of the existing crinoids. Volume 1, Part 5. United States National Museum Bulletin 82, 1–860.
Clark H. L.
(1909) Echinodermata. Australian Museum Memoir [plate XLVII.] IV, 517–527.
Clark H. L.
(1938) Echinoderms from Australia: An account of collections made in 1929 and 1932. Memoirs of the Museum of Comparative Zoology LV, 41–45.
Farris J. S.,
Albert V. A.,
Kallersjo M.,
Lipscomb D., Kluge A. G.
(1996) Parsimony jackknifing outperforms neighbor-joining. Cladistics 12, 99–124.
| Crossref | GoogleScholarGoogle Scholar |
Hebert P. D. N.,
Penton E. H.,
Burns J. M.,
Janzen D. H., Hallwachs W.
(2004) Ten species in one: DNA barcoding reveals cryptic species in the neotropical skipper butterfly Astraptes fulgerator.
Proceedings of the National Academy of Sciences of the United States of America 101, 14812–14817.
| Crossref | GoogleScholarGoogle Scholar | PubMed |
Hoggett A. K., Rowe F. W. E.
(1986) A reappraisal of the family Comasteridae A. H. Clark, 1908 (Echinodermata: Crinoidea), with the description of a new subfamily and a new genus. Zoological Journal of the Linnean Society 88, 103–142.
Kassahn K. S.,
Donnellan S. C.,
Fowler A. J.,
Hall K. C.,
Adams M., Shaw P. W.
(2003) Molecular and morphological analyses of the cuttlefish Sepia apama indicate a complex population structure. Marine Biology 143, 947–962.
| Crossref | GoogleScholarGoogle Scholar |
Landry C.,
Geyer L. B.,
Arakaki Y.,
Uehara T., Palumbi S. R.
(2003) Recent speciation in the Indo-West Pacific: rapid evolution of gamete recognition and sperm morphology in cryptic species of sea urchin. Proceedings of the Royal Society of London. Series B. Biological Sciences 270, 1839–1847.
| Crossref | GoogleScholarGoogle Scholar |
Messing C. G.
(1981) Reclassification and redescription of the comatulid Comatonia cristata (Hartlaub) (Echinodermata: Crinoidea). Proceedings of the Biological Society of Washington 94, 240–253.
Messing C.,
Améziane N., Eleaume M.
(2000) Echinodermata Crinoidea: Comatulid Crinoids of the KARUBAR Expedition to Indonesia. The families Comasteridae, Asterometridae, Calometridae and Thalassometridae. Résultats des campagnes MUSORSTOM 21, 627–702.
Messing C. G., White C. M.
(2001) A revision of the Zenometridae (new rank) (Echinodermata, Crinoidea, Comatulidina). Zoologica Scripta 30, 159–180.
| Crossref | GoogleScholarGoogle Scholar |
Meyer D. L.,
Messing C. G., Macurda D. B.
(1978) Zoogeography of tropical western Atlantic Crinoidea (Echinodermata). Bulletin of Marine Science 28, 412–441.
Mladenov P. V., Chia F. S.
(1983) Development, settling behavior, metamorphosis and pentacrinoid feeding and growth of the feather star Florometra serratissima.
Marine Biology 73, 309–323.
| Crossref | GoogleScholarGoogle Scholar |
Mortensen T.
(1920) Studies in the development of crinoids. Papers from the Department of Marine Biology of the Carnegie Institute of Washington XVI, 1–94.
O’Hara T. D., Poore G. C. B.
(2000) Patterns of distribution for southern Australian marine echinoderms and decapods. Journal of Biogeography 27, 1321–1335.
| Crossref | GoogleScholarGoogle Scholar |
Rowe F. W. E.,
Hoggett A. K.,
Birtles R. A., Vail L. L.
(1986) Revision of some comasterid genera from Australia (Echinodermata: Crinoidea), with descriptions of two new genera and nine new species. Zoological Journal of the Linnean Society 86, 197–277.
Scouras A., Smith M. J.
(2001) A novel mitochondrial gene order in the crinoid echinoderm, Florometra serratissima.
Molecular Biology and Evolution 18, 61–73.
| PubMed |
Waters J. M.,
O’Loughlin P. M., Roy M. S.
(2004) Cladogenesis in a starfish species complex from southern Australia: evidence for vicariant speciation? Molecular Phylogenetics and Evolution 32, 236–245.
| Crossref | GoogleScholarGoogle Scholar | PubMed |
Waters J. M., Roy M. S.
(2003a) Global phylogeography of the fissiparous sea-star genus Coscinasterias.
Marine Biology 142, 185–191.
Waters J. M., Roy M. S.
(2003b) Marine biogeography of southern Australia: phylogeographical structure in a temperate sea-star. Journal of Biogeography 30, 1787–1796.
| Crossref | GoogleScholarGoogle Scholar |
Won Y.,
Young C. R.,
Lutz R. A., Vrijenhoek R. C.
(2003) Dispersal barriers and isolation among deep-sea mussel populations (Mytilidae: Bathymodiolus) from eastern Pacific hydrothermal vents. Molecular Ecology 12, 169–184.
| Crossref | GoogleScholarGoogle Scholar | PubMed |