Scalibregma

A Vulnerable genera from the “Annelids” group, mostly found in Muddy Sandy Gravel

Muddy Sandy Gravel

Vulnerable

Annelids

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)
  • Short Range Mobility
  • Adult
  • Short Range Mobility
  • Sedentary

“Short Range Mobility”

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

“Short Term Planktonic” (estimated)

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

estimated

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

estimated

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

estimated

Image: Scalibregma © MES

Vulnerability

Scalibregma is a small-medium sized polychaete worm belonging to the Family Scalibregmatidae (Sludge worms). It reaches about 6cm in length & burrows in sand & muddy gravel where it is s sub-surface deposit feeder exploiting detritus. It has some mobility but is likely to be vulnerable to dredging & to deposition of sediment mobilised by the dredging process.

 

Recoverability

Little is known of the longevity, egg size or fecundity of this genus. The sexes are separate & there is one spawning between October-December after which the adults die. The reproductive epitoke stage is pelagic for a short time but there is no true larval stage. The genus is likely to have a low dispersal & recoverability.

 

References