Urothoe

A Intermediate genera from the “Crustaceans” group, mostly found in Muddy Sandy Gravel

Muddy Sandy Gravel

Intermediate

Crustaceans

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

“Adult” “Short Range Mobility”

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

“Brooded or Laid Eggs”

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

Image: Urothoe © MES

Vulnerability

Urothoe is a very small amphipod crustacean belonging to the Family Urothoidae. The body length is 0.5-0.8cm & the animal lives on the surface & in shallow burrows in muddy sand & gravel deposits. It has moderate mobility & can swim into the water column. It is vulnerable to dredging but is likely to be able to accommodate deposition of sediment mobilised by the dredging process.

 

Recoverability

The longevity of Urothoe is 1yr, & sexual maturity is achieved at 5 months. The sexes are separate & breeding is between April-October. About 15 eggs are formed per brood in a large number of reproductions that occur over a 15-day cycle during the breeding season. Fertilisation is internal. This genus has a relatively high fecundity & subsequent growth rate but a very limited dispersal potential.

 

References

  • Biology

  • Taxonomy

    • Howson & Picton, 1997
  • Distribution

    • Fish & Fish, 1996
    • Hayward & Ryland, 1995b
    • Julie Bremner, unpub data
  • Reproduction

    • Fish & Fish, 1996
    • Foster-Smith, 2000
    • Heidi Tillin, unpub data
    • Julie Bremner, unpub data