Anoplodactylus

A Vulnerable genera from the “Other: Crustacea” group, mostly found in Gravelly Muddy Sand

Gravelly Muddy Sand

Vulnerable

Other: Crustacea

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

“Short Term Planktonic” “Brooded or Laid Eggs”

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

estimated

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

estimated

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

Image: Anoplodactylus © MES

Vulnerability

Anoplodactylus is a genus of small sea spider (Pycnogonida) of 0.1cm body length. Little information is available on its general biology, although its small size, fragility & limited motility suggests that it is likely to be vulnerable to disturbance by dredging & to deposition of sediment mobilised during the dredging process.
 

Recoverability

Very little is known of the life-span or the age at which individuals mature. The eggs are about 0.12mm in diameter & are produced annually between spring & summer. Each female produces 30-40 eggs & these are transferred to the male as mature eggs at which point they are fertilised. The duration of the larval phase is 11-30 days during which time the larvae may occur as a parasitic phase within Lobelia hydroids. The larval phase is unlikely to lead to widespread dispersal, perhaps as little as 10-100m from the site of release. The small number of eggs & limited dispersal suggests that this genus has a low recoverability.

 

References

  • Biology

    • Hayward & Ryland, 1995b
    • Heidi Tillin, unpub data
    • Jarvis & King, 1978
    • Julie Bremner, unpub data
  • Distribution

  • Reproduction

    • Heidi Tillin, unpub data
    • Jarvis & King, 1978
    • Julie Bremner, unpub data
    • Lebour, 1916
    • Lebour, 1946