The Marine Life Information Network

Information on the biology of species and the ecology of habitats found around the coasts and seas of the British Isles


Sea potato (Echinocardium cordatum)

Distribution data supplied by the Ocean Biodiversity Information System (OBIS). To interrogate UK data visit the NBN Atlas.Map Help



A heart shaped urchin covered in a dense felt of yellow spines, mostly directed backwards. Yellow-brown in colour and usually 6 cm in length although can grow up to 9 cm long.

Recorded distribution in Britain and Ireland

Echinocardium cordatum is a common infaunal species found on sheltered sandy beaches, on all coasts of Britain and Ireland.

Global distribution

Almost cosmopolitan except for polar seas: Norway to South Africa, Mediterranean, Australasia and Japan.


Echinocardium cordatum lives in a permanent burrow buried about 8 cm deep (to 15 cm) in sandy sediments. The species is found from the intertidal to the subtidal and offshore to about 200 m.

Depth range

0 to -200m

Identifying features

  • Heart shaped test 6-9 cm in length, fawn in colour, spines yellowish. In profile, highest point of test posterior to apical system.
  • Ambulacra rather broad and furrow like, extending down the sides of test, forming a stellate shape.
  • The two series of tube feet in the anterior ambulacrum each forms a double row as seen by the pore-pairs on the test.
  • Some large spines and their prominent tubercles scattered ventro-laterally on the anterior interambulacra.

Additional information

The common name of this species refers to the brittle, brownish test, which is often found washed up on sheltered sandy shores.

Listed by

- none -

Biology review


Authority(Pennant, 1777)
Recent Synonyms


Typical abundanceHigh density
Male size range
Male size at maturity
Female size rangeSmall-medium(3-10cm)
Female size at maturity
Growth formGlobose
Growth rate1-2cm/year
Body flexibilityNone (less than 10 degrees)
Characteristic feeding methodSub-surface deposit feeder
Diet/food source
Typically feeds onDetritus
Environmental positionInfaunal
SupportsSee additional information
Is the species harmful?No

Biology information

  • Growth rate: Growth in Echinocardium cordatum is particularly rapid during the first and second years of life. There are also seasonal variations that are characterised by an alternation of slow and rapid growth rates, with rapid growth during spring and summer months (Ridder de et al., 1991).
  • The bivalve Tellimya ferruginosa is a commensal of Echinocardium cordatum, and as many as 14 or more of this bivalve have been recorded with a single echinoderm. Adult specimens live freely in the burrow of Echinocardium cordatum, while the young are attached to the spines of the echinoderm by byssus threads (Fish & Fish, 1996). The amphipod crustacean Urothoe marina (Bate) is another common commensal (Hayward & Ryland, 1995).

Habitat preferences

Physiographic preferencesOpen coast, Offshore seabed, Strait / sound, Enclosed coast / Embayment
Biological zone preferencesCircalittoral offshore, Lower circalittoral, Lower eulittoral, Lower infralittoral, Sublittoral fringe, Upper circalittoral, Upper infralittoral
Substratum / habitat preferencesCoarse clean sand, Fine clean sand, Muddy sand, Sandy mud
Tidal strength preferencesNo information
Wave exposure preferencesExtremely sheltered, Sheltered, Very sheltered
Salinity preferencesFull (30-40 psu), Reduced (18-30 psu)
Depth range0 to -200m
Other preferencesNo text entered
Migration PatternSeasonal (reproduction)

Habitat Information

The species has an annual tendency to form aggregations during the breeding season (Buchanan, 1966). There is also a migration of individuals from the subtidal to the intertidal at about 2 years of age.

Life history

Adult characteristics

Reproductive typeGonochoristic (dioecious)
Reproductive frequency Annual episodic
Fecundity (number of eggs)>1,000,000
Generation timeInsufficient information
Age at maturity2-3 years
SeasonSpring - Summer
Life span10-20 years

Larval characteristics

Larval/propagule type-
Larval/juvenile development Planktotrophic
Duration of larval stageNo information
Larval dispersal potential No information
Larval settlement periodInsufficient information

Life history information

  • Lifespan Observation of populations of Echinocardium cordatum over a period of 7 years suggests the species has a lifespan greater than 10 years (Buchanan, 1966; Hayward et al., 1996). However, in the Mediterranean Guillou (1985) suggests the lifespan is one or two years.
  • Age at maturity: On the north-east coast of England a littoral population bred for the first time when three years old. In the warmer waters of the west of Scotland breeding has been recorded at the end of the second year (Fish & Fish, 1996). However, it has been observed that subtidal populations appear never to reach sexual maturity (Buchanan, 1967).
  • Recruitment: Often sporadic, with reports of Echinocardium cordatum recruiting in only 3 years over a 10 year period (Buchanan, 1966) although this relates to subtidal populations. Intertidal individuals reproduce more frequently.
  • The sexes are separate and fertilization external, with the development of a pelagic larva (Fish & Fish, 1996). The fact that Echinocardium cordatum is to be found associated with several different bottom communities would indicate that the larvae are not highly selective and discriminatory and it is probable that the degree of discrimination in 'larval choice' becomes diminished with the age of the larvae (Buchanan, 1966). Metamorphosis of larvae takes place within 39 days after fertilization (Kashenko, 1994).

Sensitivity reviewHow is sensitivity assessed?

Physical pressures

High High Moderate Moderate
Loss of the substratum will also remove the resident population of the burrowing Echinocardium cordatum and so intolerance is high. The species has high fecundity, normally reproduces every year and has pelagic larvae so recovery should be good. Individuals can also migrate from unaffected areas. The time for re-establishment of faunal biomass after a period of anoxia related mortality in the south-eastern North Sea was 2 years (Niermann, 1997). However, Buchanan (1966) studied a North Sea subtidal population that had not recruited for several years so recovery could take longer.
Tolerant Not relevant Not sensitive High
Echinocardium cordatum lives buried in sand up to 15 cm deep so will be not sensitive to smothering by 5 cm of sediment.
Low High Low High
Echinocardium cordatum is probably tolerant of increases in siltation. In the bay of Mevagissey for example, where fine-grained mineral waste from the china clay industry was dumped over many years, Echinocardium cordatum was present in high numbers (Probert, 1981). However, the species feeds on detritus that accumulates on the bottom and so its growth consequently relies on the regular supply of detritus (Ridder de, et al., 1991). Therefore, a decline in siltation levels may impair growth although the species is able to migrate, albeit rather slowly, to other areas.
No information
Low High Low Moderate
Echinocardium cordatum occurs in the subtidal and the lower intertidal. In the intertidal Echinocardium cordatum is protected from desiccation because it inhabits a burrow in soft sediments to a depth of up to 15cm. Subtidal populations are not likely to be affected by desiccation.
Low High Low Moderate
Echinocardium cordatum occurs in the subtidal and the lower intertidal. Subtidal populations will not be affected by emergence at the level of the benchmark. However, an increase in emergence for intertidal populations is likely to depress the height up the shore that intertidal populations can occur. During extreme low water spring tides serious predation by gulls of shallow-burrowing Echinocardium cordatum which are normally safely out of the reach of gulls (D. Nichols pers. comm.).
No information
Intermediate High Low Moderate
Spatangoid echinoderms such as Echinocardium cordatum can be washed out by water currents generated by gales (Lawrence, 1989). Therefore, the species is likely to be intolerant of increases in water flow rates that similarly wash out sediments and intolerance is assessed as intermediate.
No information
Intermediate High Low Moderate
Echinocardium cordatum has a relatively wide degree of tolerance to temperature (Higgins, 1974) in accordance with its cosmopolitan distribution. Growth rates are generally higher growth rates in warmer waters (Duineveld & Jenness, 1984). Temperature may also be a factor fine tuning the seasonal pattern of growth where somatic growth (summer) alternates with gonadial growth (winter) (D. Nichols pers. comm.) Very low water temperature can cause mass mortalities of Echinocardium cordatum and so intolerance has been assessed as intermediate. During the severe winter of 1963 the species was almost completely eliminated from the German Bight to a depth of about 20m (Lawrence, 1996) and very heavy mortality was observed in the English Channel and North Sea (Crisp (ed.), 1964). High temperatures can also cause a suffocation effect: there can be mass mortality of Echinocardium cordatum on sandy shores following oxygen depletion during extreme low water tides on hot days (D. Nichols pers. comm.).
No information
Low High Low Moderate
Echinocardium cordatum lives buried in sand up to 15 cm deep so is not likely to be affected by changes in turbidity. However, a decrease in turbidity may result in a decline in the supply of organic matter to the seabed surface from which the species feeds possibly causing reduced growth and fecundity.
No information
Intermediate High Low Low
Echinocardium cordatum is typically a sheltered shore species although in coastal waters of the Netherlands the species occurs in the tidal zone on some sandflats exposed to wave-action, at the entrances of the Oosterschelde and the Westerschelde (Wolff, 1968). In the bay of Douarnenez, Brittany Echinocardium cordatum was found only in areas of fine sand dominated by high sediment instability, due to marked exposure to westerly swells (Guillou, 1985). However, Echinocardium cordatum is unlikely to survive in areas of extreme wave exposure so intolerance is assessed as intermediate.
No information
Tolerant Not relevant Not sensitive Not relevant
No evidence of sound or vibration reception in echinoids was found.
Not relevant Not relevant Not relevant Not relevant
Some response to visual disturbance has been detected in echinoderms. There is some evidence that the basiepithelial nerve plexus below the entire outer skins is sensitive to light (D. Nichols pers. comm.). However, Echinocardium cordatum generally lives buried in sand up to 15cm deep and so visual disturbance is not relevant. When on the surface of the substratum visual disturbance may cause the urchin to re-burrow into the substratum.
High High Moderate High
The species has a fragile test that is likely to be damaged by an abrasive force such as movement of trawling gear over the seabed. A substantial reduction in the numbers of Echinocardium cordatum due to physical damage from scallop dredging has been observed (Eleftheriou & Robertson, 1992). Smaller size classes of the heart urchin are found near the surface of the sediment and are therefore likely to be more vulnerable to physical damage (Jennings & Kaiser, 1998). Echinocardium cordatum was also reported to suffer between 10 and 40% mortality due to fishing gear, depending on the type of gear and sediment after a single trawl event (Bergman & van Santbrink, 2000). They suggested that mortality may increase to 90% in summer when individuals migrate to the surface of the sediment during their short reproductive season. Bergman & van Santbrink (2000) suggested that Echinocardium cordatum was one of the most vulnerable species to trawling. Therefore, an intolerance of high has been recorded.
The species has high fecundity, normally reproduces every year and has pelagic larvae so recovery should be good. The time for re-establishment of faunal biomass after a period of anoxia, for example, related mortality in the south-eastern North Sea was two years (Niermann, 1997)
Low High Low Moderate
In the intertidal displacement from the sediment is likely to expose Echinocardium cordatum to an increased risk of predation. However, once on the substratum surface Echinocardium cordatum is capable of re-burrowing into the sediment within 20 minutes and so intolerance is low. Recovery is good because the species has a pelagic larva and individuals can migrate from unaffected areas.

Chemical pressures

High High Moderate Moderate
Detergents used to disperse oil from the Torrey Canyon oil spill caused mass mortalities of Echinocardium cordatum (Smith, 1968). The toxicity of TBT to Echinocardium cordatum is similar to that of other benthic organisms with LC50 values of 222ng Sn/l in pore water and 1594ng Sn/g dry weight of sediment (Stronkhorst et al., 1999). Sea-urchins, especially the eggs and larvae, are used for toxicity testing and environmental monitoring (reviewed by Dinnel et al. 1988). It is likely therefore, that Echinocardium cordatum and especially its larvae are highly sensitive to synthetic contaminants.
Heavy metal contamination
Intermediate High Low Moderate
Information about the effects of heavy metals on echinoderms is limited and no details specific to Echinocardium cordatum were found. However, Bryan (1984) reports that early work has shown that echinoderm larvae are intolerant of heavy metals, e.g. the intolerance of larvae of Paracentrotus lividus to copper (Cu) had been used to develop a water quality assessment. Kinne (1984) reported developmental disturbances in Echinus esculentus exposed to waters containing 25 µg / l of copper (Cu). Therefore, it is likely that Echinocardium cordatum is intolerant of heavy metal contamination and intolerance is assessed as high.
Hydrocarbon contamination
High High Moderate High
Echinoderms seem especially intolerant of the toxic effects of oil, likely because of the large amount of exposed epidermis (Suchanek, 1993). The high intolerance of Echinocardium cordatum to hydrocarbons was seen by the mass mortality of animals, down to about 20m, shortly after the Amoco Cadiz oil spill (Cabioch et al., 1978). Reduced abundance of the species was also detectable up to > 1000m away one year after the discharge of oil-contaminated drill cuttings in the North Sea (Daan & Mulder, 1996). The species has high fecundity, normally reproduces every year and has a pelagic larva so recovery should be good. Individuals can also migrate from unaffected areas. The first repopulation of Echinocardium cordatum after the Torrey Canyon accident was noticed two years after the oil spill (Southward & Southward, 1978).
Radionuclide contamination
No information No information No information Not relevant
Changes in nutrient levels
High High Moderate High
Echinocardium cordatum is generally found in sediments with low organic content and the species appears to be intolerant of increases in nutrient concentration. Growth levels have been observed to be lower in sediments with high organic content although it is suggested that this may be due to higher levels of intraspecific competition (Duineveld and Jenness, 1984). The species was also absent from an area in the southern North Sea into which large quantities of sewage sludge from Hamburg had been dumped and the species was never seen to settle in the area (Caspers, 1980). Pearson & Rosenberg (1976) describe the changes in fauna along a gradient of increasing organic enrichment by pulp fibre where Echinocardium cordatum is absent from all but distant sediments with low organic input and so intolerance is assessed as high.
Intermediate High Low Moderate
Echinoderms are considered to be stenohaline animals that lack the ability to osmo- and ion-regulate (Stickle & Diehl, 1987). However, Echinocardium cordatum has been recorded from brackish waters in the Delta region of the Netherlands to about the 15psu isohaline (Wolff, 1968). Echinoderm larvae have a narrow range of salinity tolerance and will develop abnormally and die if exposed to reduced or increased salinity.
No information
High High Moderate High
Echinocardium cordatum is highly intolerant of reductions in oxygen concentration. Buchanan (1966) found that individuals of Echinocardium cordatum at Newton Haven burrowed into sand to a depth of 15cm but avoided penetrating into dark sand with presumably reducing conditions. In the south-eastern North Sea a period of reduced oxygen resulted in the death of many individuals of Echinocardium cordatum (Niermann, 1997) and during periods of hypoxia the species migrates to the surface of the sediment (Diaz & Rosenberg, 1995). High intolerance has also been demonstrated in laboratory experiments. At 4mg/l individuals appeared on the sediment surface and many were dead at a concentration of 2.4mg/l (Nilsson & Rosenberg, 1994). The species has high fecundity, normally reproduces every year and has a pelagic larva so recovery should be good. Individuals can also migrate from unaffected areas. The time for re-establishment of faunal biomass after a period of anoxia related mortality in the south-eastern North Sea was 2 years (Niermann, 1997).

Biological pressures

Low High Low Low
The occurrence of several parasitic gregarine protozoans, such as Urospora neapolitana, have been observed in the body cavity of Echinocardium cordatum (Coulon & Jangoux, 1987). However, no information concerning infestation or disease related mortalities was found.
Not relevant Not relevant Not relevant Low
No alien or non-native species is known to compete with Echinocardium cordatum.
Intermediate High Low Not relevant
Targeted extraction of Echinocardium cordatum is unlikely although dredging may remove populations in some habitats. Recovery from dredging should be good because the species has a pelagic larva and individuals can migrate from unaffected areas.
Intermediate High Low High
Hydraulic dredging for razor shells (Ensis spp.) may also disturb and damage Echinocardium cordatum which is often found in the same habitat. Recovery should be good because the species has a relatively long lived pelagic larvae and individuals can migrate from unaffected areas.

Additional information

Importance review


- no data -



Importance information



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  2. Bryan, G.W., 1984. Pollution due to heavy metals and their compounds. In Marine Ecology: A Comprehensive, Integrated Treatise on Life in the Oceans and Coastal Waters, vol. 5. Ocean Management, part 3, (ed. O. Kinne), pp.1289-1431. New York: John Wiley & Sons.

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  4. Buchanan, J.B., 1967. Dispersion and demography of some infaunal echinoderm populations. Symposia of the Zoological Society of London, 20, 1-11.

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  6. Caspers, H., 1980. Adaptation and biocoenotic associations of echinoderms in a sewage dumping area of the southern North Sea. A macro-scale experiment. In Echinoderms: present and past (ed. M. Jangoux), pp. 189-198. Rotterdam: Balkema.

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  13. Eleftheriou, A. & Robertson, M.R., 1992. The effects of experimental scallop dredging on the fauna and physical environment of a shallow sandy community. Netherlands Journal of Sea Research, 30, 289-299.

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  19. Jennings, S. & Kaiser, M.J., 1998. The effects of fishing on marine ecosystems. Advances in Marine Biology, 34, 201-352.

  20. Kashenko, S.D., 1994. Larval development of the heart urchin Echinocardium cordatum feeding on different macroalgae. Biologiya Morya, 20, 385-389.

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  25. Niermann, U., 1997. Macrobenthos of the south-eastern North Sea during 1983-1988. Berichte der Biologischen Anstalt Helgoland, 13, 144pp.

  26. Nilsson, H.C. & Rosenberg, R., 1994. Hypoxic response of two marine benthic communities. Marine Ecology Progress Series, 115, 209-217.

  27. Pearson, T.H. & Rosenberg, R., 1976. A comparative study of the effects on the marine environment of wastes from cellulose industries in Scotland and Sweden. Ambio, 5, 77-79.

  28. Probert, P.K., 1981. Changes in the benthic community of china clay waste deposits is Mevagissey Bay following a reduction of discharges. Journal of the Marine Biological Association of the United Kingdom, 61, 789-804.

  29. Ridder de, C., David, B., Laurin, B. & Gall le, P., 1991. Population dynamics of the spatangoid echinoid Echinocardium cordatum (Pennant) in the Bay of Seine, Normandy. In Proceedings of the Seventh International Echinoderm Conference Atami, 9 - 14 September 1991: Biology of Echinodermata, (ed. Yanagisawa, T., Yasumasu, I., Oguro, C., Suzuki, N. & Motokawa, T.), 153-158. Balkema, Rotterdam.

  30. Rumohr, H. & Kujawski, T., 2000. The impact of trawl fishery on the epifauna of the southern North Sea. ICES Journal of Marine Science, 57, 1389-1394.

  31. Smith, J.E. (ed.), 1968. 'Torrey Canyon'. Pollution and marine life. Cambridge: Cambridge University Press.

  32. Southward, A.J. & Southward, E.C., 1978. Recolonisation of rocky shores in Cornwall after use of toxic dispersants to clean up the Torrey Canyon spill. Journal of the Fisheries Research Board of Canada, 35, 682-706.

  33. Stickle, W.B. & Diehl, W.J., 1987. Effects of salinity on echinoderms. In Echinoderm Studies, Vol. 2 (ed. M. Jangoux & J.M. Lawrence), pp. 235-285. A.A. Balkema: Rotterdam.

  34. Stronkhorst, J., Hattum van, B. & Bowmer, T., 1999. Bioaccumulation and toxicity of tributyltin to a burrowing heart urchin and an amphipod in spiked, silty marine sediments. Environmental Toxicology and Chemistry, 18, 2343-2351.

  35. Suchanek, T.H., 1993. Oil impacts on marine invertebrate populations and communities. American Zoologist, 33, 510-523. DOI

  36. Wolff, W.J., 1968. The Echinodermata of the estuarine region of the rivers Rhine, Meuse and Scheldt, with a list of species occurring in the coastal waters of the Netherlands. The Netherlands Journal of Sea Research, 4, 59-85.


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This review can be cited as:

Hill, J.M. 2008. Echinocardium cordatum Sea potato. In Tyler-Walters H. and Hiscock K. Marine Life Information Network: Biology and Sensitivity Key Information Reviews, [on-line]. Plymouth: Marine Biological Association of the United Kingdom. [cited 07-06-2023]. Available from:

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Last Updated: 13/05/2008