Tubularia

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

Cobbles

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)
  • Brooded or Laid Eggs
  • Long Term Planktonic
  • Short Term Planktonic
  • Brooded or Laid Eggs

“Brooded or Laid Eggs”

Lifespan
  • 1-2 years
  • >10 years
  • 3-10 years
  • 1-2 years
  • <1 year
Maturity
  • <1 year
  • >4 years
  • 3-4 years
  • 1-2 years
  • <1 year
Fecundity
  • 10 - 100
  • 1 - 10
  • 10 - 100
  • 100 - 1000
  • 1000 - 10000
  • 10000 - 1 million
  • > 1 million

Image: Tubularia © Anne Bennet

Vulnerability

Tubularia is an athecate hydroid belonging to the Family Tubulariidae. The stolon tubes grow to a height of 5-20cm & are attached to rocks & stones. As with other hydroids, the polyps feed on zooplankton that is captured by special cells (nematocysts). The colonies are vulnerable to dredging & to the deposition of sediment mobilised by the dredging process.

 

Recoverability

The life-span of this hydroid is about 1yr & the age at maturity is 6-8 weeks. The sexes are separate & the polyps reproduce throughout the year, with a maximum from April-June. The eggs are fertilised externally & the larvae are brooded; there is no planktonic phase. This genus has a low recoverability.

 

References

  • Taxonomy

    • Allman, 1871-1872
    • Hayward & Ryland, 1995b
    • Hincks, 1868
    • Howson & Picton, 1997
  • Distribution

    • Allman, 1871-1872
    • Fish & Fish, 1996
    • Hayward & Ryland, 1995b
    • Hincks, 1868
    • JNCC, 1999
  • Reproduction

    • Fish & Fish, 1996
    • Miller, 1976