Leptosynapta

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

Muddy Sandy Gravel

Vulnerable

Echinoderms

Genera Characteristics Recorded Traits Possible Values
Size in cm
  • >20 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)
  • Brooded or Laid Eggs
  • Long Term Planktonic
  • Short Term Planktonic
  • Brooded or Laid Eggs

“Brooded or Laid Eggs”

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

estimated

estimated

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

estimated

Fecundity
  • 1 - 10
  • 10 - 100
  • 100 - 1000
  • 1000 - 10000
  • 1 - 10
  • 10 - 100
  • 100 - 1000
  • 1000 - 10000
  • 10000 - 1 million
  • > 1 million

Image: Leptosynapta © MES

Vulnerability

Leptosynapta is a medium-large sized sea cucumber belonging to the Family Synaptidae. It reaches a body length of 20-50cm & lives buried in mud, muddy sand & muddy gravel substrates where it feeds on detrital material at the sediment surface. It has very limited powers of movement & is likely to be vulnerable to the direct effects of dredging & to sediment mobilised during the dredging process.

 

Recoverability

Little information is available on the life-span of this genus. The genus is hermaphrodite & breeding is in August-September. Fertilisation of the 0.2mm eggs is internal, with the juveniles being released as miniature adults from a brood pouch. The brood size is reported to vary from 5 to over 2000 depending on the species. This genus has very limited dispersal potential, & is assessed as of low recovery potential.

 

References

  • Biology

    • Eltringham, 1971
    • Hayward & Ryland, 1995b
  • Taxonomy

    • Howson & Picton, 1997
  • Distribution

    • Foster-Smith, 2000
    • Hayward & Ryland, 1995b
    • Picton, 1993
  • Reproduction

    • Everingham, 1961
    • Fish & Fish, 1996
    • Thorson, 1946
    • Thorson, 1946