Polinices

A Robust genera from the “Molluscs” group, mostly found in Sand

Sand

Robust

Molluscs

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

“Long Term Planktonic” “Brooded or Laid Eggs”

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

estimated

Image: Polinices © MES

Vulnerability

Polinices (synonym Natica) is a genus of small gastropod molluscs belonging to the Family Naticidae (Necklace shells). It reaches a size of up to 2cm & lives in clean sands where it preys on bivalves after boring through one of the shell valves. It is moderately mobile in the sand but is likely to be vulnerable to dredging. It probably has the ability to resurface through a moderate thickness of sediment mobilised & deposited during the dredging process.
 

Recoverability

Polinices has a probable life-span of 5yrs & sexual maturity is related to body size - generally at 8-10mm shell length. Fecundity is also strongly related to the size & age of the female. There is an annual protracted breeding season that peaks in July & August & fertilisation is internal. The eggs are produced as an egg collar & hatch into planktotrophic veliger larvae of up to 0.8mm length that spend 40-50 days in the water column. The genus has a moderate fecundity in larger females, & a long larval stage. Recoverability is likely to be intermediate-high.
 

References

  • Biology

    • Ansell, 1982
    • Christensen, 1980
    • Copeland, 1922
    • Edwards & Huebner, 1977
    • Graham, 1988
    • Hayward & Ryland, 1995b
    • Kingsley-Smith et al., 2003
    • Seaward, 1982
  • Taxonomy

    • Hayward & Ryland, 1995b
    • Howson & Picton, 1997
  • Distribution

    • Christensen, 1980
    • Hayward & Ryland, 1995b
    • Seaward, 1982
  • Reproduction

    • Ansell, 1982
    • Graham, 1988
    • Hayward & Ryland, 1995b
    • Kingsley-Smith et al., 2003
    • Kingsley-Smith et al., 2005
    • Seaward, 1982