Henricia

A Intermediate genera from the “Echinoderms” group, mostly found in Gravel

Gravel

Intermediate

Echinoderms

Genera Characteristics Recorded Traits Possible Values
Size in cm
  • 11-20 cm
  • <1 cm
  • 1-10 cm
  • 11-20 cm
  • >20 cm
Genera Characteristics Recorded Traits Possible Values
Motility (Adult)
  • Adult
  • Adult
  • Short Range Mobility
  • Sedentary

“Adult”

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
  • 3-10 years
  • >10 years
  • 3-10 years
  • 1-2 years
  • <1 year
Maturity
  • >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: Henricia © Jane Ossman

Vulnerability

The starfish Henricia is distributed around the British Isles, on coarse substrata from pebbles and gravel to large boulders and bedrocks in a depth range of 0 to 100 m. Henricia feeds on suspended matter, layers of detritus, sponges, hydroids and ectoprocts. The adult size of these starfish varies between 11 and 20 cm and life span is 3-5 years. These animals are likely to be vulnerable to aggregates extraction.

Recoverability

Henricia is a free living species with an adult potential dispersal of up to 10 km. The reproductive season is from March to April although it can also be annually protracted. Each female can produce 100-1000 eggs, and larval dispersion potential is more than 10 km. Recovery potential after dredging is likely to be intermediate due to the possibility of both larval and adult migration. Like other starfish, Henricia is able to regenerate missing parts of its body when it has been damaged.

References

  • Biology

    • Brun, 1976
    • Campbell, 1994
    • Nichols, 1969
  • Taxonomy

    • Brun, 1976
    • Campbell, 1994
    • Howson & Picton, 1997
  • Distribution

    • Brun, 1976
    • Campbell, 1994
    • Nichols, 1969
  • Reproduction

    • Brun, 1976