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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