Axius

A Vulnerable genera from the “Crustaceans” group, mostly found in Muddy Sand

Muddy Sand

Vulnerable

Crustaceans

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

“Long Term Planktonic”

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

estimated

estimated

Maturity
  • 1-2 years (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: Axius © MES

Vulnerability

Axius is a relatively uncommon genus of burrowing shrimp of about 7cm length that belongs to the class Eumalacostraca. It is found mainly in relatively stable deposits of mud & sand. Water is drawn through the burrow for irrigation & the shrimp gathers food from the surface of the substratum before retreating into the burrow for protection from predators. It has limited mobility outside of the burrow & is likely to be vulnerable to disturbance both by dredging & from sediments mobilised by the dredging process.

 

Recoverability

There is hardly any information on the life span, the age at maturity or the fecundity of this genus. The larva is an easily-recognisable member of the plankton but is rarely common. It is likely to be widely dispersed from the site of spawning. The overall recoverability is probably intermediate based on the dispersal & recolonisation of other genera of crustaceans with planktotrophic larvae.

 

References

  • Biology

    • Hayward & Ryland, 1995b
  • Reproduction

    • Wenner, 1985