a new species of shell forming sea anemone from australia
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A NEW SPECIES OF SHELL-FORMING SEA ANEMONE FROM AUSTRALIA. Andrea L. Crowther Department of Ecology and Evolutionary Biology. Overview. Associations between hermit crabs and anemones occur in nature Hermit crab and Stylobates Described species of Stylobates

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a new species of shell forming sea anemone from australia

A NEW SPECIES OF SHELL-FORMING SEA ANEMONE FROM AUSTRALIA

Andrea L. Crowther

Department of Ecology and Evolutionary Biology

overview
Overview
  • Associations between hermit crabs and anemones occur in nature
  • Hermit crab and Stylobates
  • Described species of Stylobates
  • New species found from Australia
hermit crab and anemones
Hermit crab and anemones
  • Hermit crabs live in abandoned snail shells
  • Anemones attach to shell
  • Crabs change shells as grow, sometimes transfer anemones
  • From shallow tropical areas to deep sea
  • General dynamics of relationships

http://www.divegallery.com/hermit_crab2.htm

stylobates
Stylobates
  • Deep sea (300-1000 m)
  • Always host to hermit crab
  • Obligate symbiosis for anemone
  • Shell-forming!
  • One anemone per crab
benefits for the symbionts
For the crab

Protection

Shell to live in

Long term accommodation

For the anemone

Transport

Food availability

Benefits for the symbionts
the shell
The shell
  • Carcinoecium
  • Chitinous secretion
  • Anemone coats and extends hermit crab’s shell
  • Mistaken for a snail’s shell

http://s190418054.onlinehome.us/portal/2003/0312mon.pdf

co evolution
Co-evolution

?

www.es.ucl.ac.uk/schools/Glossary/gastropod.jpg

www.glaucus.org.uk/Hermit4.htm

www.aqualandpetsplus.com.Bug.%20Hermit%20Crabs.htm

stylobates aeneus
Stylobates aeneus
  • Original description of shell
  • Anemone discarded!
  • Location: Hawaii and Guam (Pacific Ocean)
  • 402-797 m deep
stylobates distribution
Stylobates distribution

Stylobates aeneus; Stylobates cancrisocia; Stylobates loisetteae; Stylobates n.sp.

stylobates cancrisocia
Stylobates cancrisocia
  • Location: East Africa (Indian Ocean)
  • 818 m deep
  • 3 specimens
stylobates loisetteae
Stylobates loisetteae
  • Location: west coast of Australia
  • 320-508 m deep
  • Wide oral disc
  • Oral disc position
a new species
A new species
  • Location: north east Australia
  • 680-960 m deep
  • 10 specimens
  • Size ranging from 5-9 cm length
  • Study of morphology
review
Review
  • Stylobates anemones are found in the deep sea
  • Form associations with hermit crabs
  • Produce carcinoecium
  • New species found from north east coast of Australia
acknowledgments
Acknowledgments
  • Supervisors:
    • Dr. Daphne Fautin (KU)
    • Dr. Carden Wallace (MTQ, Australia)
  • Collectors:
    • Dr. Alistair Birtles (JCU, Australia)
    • The late Dr. Peter Arnold (MTQ, Australia)
  • Sigma Xi
  • Questions?
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