Cerianthus

A Vulnerable genera from the “Other: Cnidaria” group, mostly found in Mud

Mud

Vulnerable

Other: Cnidaria

Genera Characteristics Recorded Traits Possible Values
Size in cm
  • 11-20 cm
  • <1 cm
  • 1-10 cm
  • 11-20 cm
  • >20 cm
Genera Characteristics Recorded Traits Possible Values
Motility (Adult)
  • Sedentary
  • Adult
  • Short Range Mobility
  • Sedentary

“Sedentary”

Motility (Larval)
  • Long Term Planktonic
  • Long Term Planktonic
  • Short Term Planktonic
  • Brooded or Laid Eggs

“Long Term Planktonic”

Lifespan
  • >10 years
  • >10 years
  • 3-10 years
  • 1-2 years
  • <1 year
Maturity
  • 1-2 years (Estimated)
  • >4 years
  • 3-4 years
  • 1-2 years
  • <1 year

estimated

Fecundity
  • 1000 - 10000 (Estimated)
  • 1 - 10
  • 10 - 100
  • 100 - 1000
  • 1000 - 10000
  • 10000 - 1 million
  • > 1 million

estimated

Image: Cerianthus © Mark Coombes

Vulnerability

Cerianthus is a 10-15cm tubiculous sea anemone. It lives permanently in a felt-like tube constructed from mucus & mud, sand or gravel. It is able to retract rapidly into the tube when disturbed, but at other times feeds by capturing material at the sediment-water interface with tentacles armed with nematocysts. It is vulnerable to both the physical disturbance & possible sedimentation associated with aggregate dredging.

 

Recoverability

Cerianthus is a long-lived anemone with a life-span of as much as 11-20yrs. The age at sexual maturity & fecundity is unknown. Fertilisation is external fertilisation & the larvae are pelagic. The dispersal potential may therefore be high, although without information on the fecundity, it is not possible to estimate the recolonisation potential for this genus. The long life-span & slow growth of this anemone suggests that it has a low rate of restoration of the biomass following recolonisation.

 

References

  • Biology

    • Fish & Fish, 1996
  • Taxonomy

    • Hayward & Ryland, 1995b
    • Hayward et al., 1996
    • Howson & Picton, 1997
    • Manuel, 1988
  • Distribution

    • Bruce et al., 1963
    • Fish & Fish, 1996
    • Hayward & Ryland, 1995b
    • Hayward et al., 1996
    • JNCC, 1999
    • Manuel, 1988
    • Picton & Costello, 1998
  • Reproduction

    • Manuel, 1988