Ascidiella

A Intermediate genera from the “Other: Chordata” group, mostly found in Cobbles

Cobbles

Intermediate

Other: Chordata

Genera Characteristics Recorded Traits Possible Values
Size in cm
  • 1-10 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
  • Short Term Planktonic
  • Brooded or Laid Eggs

Lifespan
  • 3-10 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
  • 1 - 10
  • 10 - 100
  • 100 - 1000
  • 1000 - 10000
  • 10000 - 1 million
  • > 1 million

Image: Ascidiella © John Ryland

Vulnerability

The sea squirt Ascidiella is an epifaunal active suspension feeder of phytoplankton and other organic particles. Individuals are gregarious and may be widely distributes on cobbles, biogenic reefs and hard substrata. Being a sessile genera, and fragile to physical impact, it is likely to be vulnerable to dredging activities.

Recoverability

Ascidiella reaches reproductive maturity at <1 year and is highly fecund. The genus is oviparous with tadpole larvae that emerge from the egg. The high fecundity of this genus and the wide distribution suggest that recovery after disturbance may be fast, provided that the substratum remains rich in coarser sediments such cobbles and boulders for attachment.

References

  • Biology

    • Lindsay & Thompson, 1930
  • Taxonomy

    • Lindsay & Thompson, 1930
    • Millar, 1970
  • Distribution

    • Lindsay & Thompson, 1930
    • Millar, 1970
    • NBN, 2002
  • Reproduction

    • Lindsay & Thompson, 1930