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Crown-of-thorns starfish

Acanthaster planci
Oor die naam: Its common name comes from the long, thornlike spines that cover its upper surface, which resemble the biblical crown of thorns.1
Moet 'n dokter sienMoenie aanraak nieSelde dodelik, maar as sy stekels jou steek, gaan dokter toe.
See-egels, seesterre & wurms Giftige stekelsEet: Vleis
Gevaar vir mense: ErnstigAs sy stekels jou steek, gaan dokter toe. Sterftes is baie skaars.

The crown-of-thorns starfish is a large starfish with long, sharp spines that look like a crown of thorns. It lives on coral reefs across the Indo-Pacific, from the Red Sea to the west coast of Central America, and it is most common around Australia. It feeds on hard coral, so it can change the reefs it lives on.1

Leef in
Indo-Pacific: Red Sea, East African coast, Indian Ocean, Pacific Ocean to west coast of Central America; most common around Australia1
Indiese Oseaan, Stille Oseaan, Rooi See, Koraalsee, Filippynse See, Suid-Chinese See, Andamansee, Arabiese See & Persiese Golf, Timorsee & Arafurasee, Baai van Bengale
Tuis
It lives where coral reefs or hard coral communities occur in tropical and subtropical waters.1
Lengte
25 cm tot 35 cm (9,8 in tot 1,1 ft)1
Topspoed
omtrent 0,02 km/h (0,01 mph)
Swem, rowwe skatting
Wat eet dit?
It is a coral predator that climbs onto living coral using its tube feet and pushes its stomach out over the coral. Digestive enzymes turn the coral tissue into liquid, which it absorbs, leaving a white scar of bare skeleton.1
Regtig waar!Foto van Crown-of-thorns starfish
Crown-of-thorns starfish. Foto: John Hepburn. CC BY 4.0, Wikimedia Commons.

Hoe om dit te herken

  • Adults are normally 25 to 35 cm across.1
  • Up to 21 arms, with long, stiff, very sharp spines that are 4 to 5 cm long on the top and sides of the arms.1
  • Colour varies with diet or region: purple, purple-blue, reddish grey or brown with red spine tips, or green with yellow spine tips.1
  • The body is flexible and can bend and twist around coral surfaces.1

Word dikwels verwar met: A close relative, Acanthaster brevispinus, lives on soft sea floors at moderate depths rather than on coral reefs. The two are considered sibling species.1

Gifkrag

Giftige stekels

Skerp stekels dra die gif. Dit maak seer as jy daarop trap of dit gryp.

Wat doen sy gif as dit byt of steek?

The spines do not inject venom. When they pierce skin, tissue containing saponins (detergent-like chemicals) is left in the wound. In humans this causes a sharp, stinging pain that can last several hours, persistent bleeding, and nausea and swelling that may last a week or more.1

Hoe gevaarlik is dit vir mense?

Gevaar vir mense: ErnstigAs sy stekels jou steek, gaan dokter toe. Sterftes is baie skaars.

The spines can cause sharp pain, long-lasting bleeding, nausea and swelling. Brittle spines can break off and stay in the tissue.1

As sy stekels jou steek

  • Spines that become embedded in the tissue must be removed surgically.1
  • Sit die wond in warm water, so warm as wat die persoon kan verdra sonder om te brand, en kry mediese hulp om die stekels te verwyder. Moenie self daarna grawe nie.

Bel altyd eers jou noodnommer (112, 000, 911). Dit is algemene noodhulpraad, nie mediese advies nie. Noodhulp-basiese beginsels

Bly veilig

  • Moet nooit aan 'n wilde dier raak, dit vang of terg nie, selfs nie 'n kleintjie nie, en selfs nie as dit lyk of dit slaap of dood is nie.
  • Gee dit spasie. As jy een raakloop, bly kalm, stap stadig terug en laat dit sy eie pad gaan.
  • As sy stekels jou steek: bly kalm, bly stil, bel jou noodnommer (112, 000, 911) of kom vinnig by 'n hospitaal uit. Onthou hoe dit gelyk het, 'n foto help.

Dit is nie uit om jou te kry nie. Dit gebruik sy gif om kos te vang of om homself te beskerm, en kruip baie eerder weg. Meer oor veilig bly

Waar in die wêreld?

AfrikaAsiëEuropaNoord-AmerikaSuid-AmerikaAustralië & OseaniëStille OseaanIndiese OseaanRooi SeeKoraalseeSuid-Chinese SeeFilippynse SeeAndamanseeArabiese See & Persiese GolfTimorsee & ArafuraseeBaai van Bengale

Hoe groot is dit?

Hoe lank is dit?

Crown-of-thorns starfish omtrent 35 cm lank (1,1 ft)'n Piesang omtrent 18 cm (7,1 in)'n Huiskat omtrent 50 cm (1,6 ft)
so lank soos 11 speelgoed-boublokke in 'n rystadiger as 'n tuinslak

Hoe groot is Crown-of-thorns starfish in vergelyking met JOU?

Net wiskunde in jou blaaier. Niks word gestoor of enige plek heen gestuur nie.

Hoe vinnig is dit?

die moeite werd om te weet

Feite

1

An individual starfish can consume up to 6 square metres of living coral reef per year.1

2

When taken out of water, its soft body ruptures and collapses, but its spines can recover their shape if it is put back in the water while still alive.1

3

Its body contains detergent-like saponins, so keeping starfish in small volumes of water with aeration produces large amounts of foam.1

4

It is one of the largest starfish in the world.1

5

It has lost the usual five-fold symmetry of starfish as it grew more arms, although it begins life with five-fold symmetry.1

Mite-breker

Mite: Its spines inject venom like a snake or stinging animal.

Waarheid: It has no mechanism for injecting toxin. Its spines pierce skin and leave saponin-containing tissue in the wound.1

Vir gifkenners

Wetenskaplike naam
Acanthaster planci
Groep
See-egels, seesterre & wurms
Familie
Acanthasteridae2
Orde
Valvatida
Kontinente
Indiese Oseaan, Stille Oseaan, Rooi See, Koraalsee, Filippynse See, Suid-Chinese See, Andamansee, Arabiese See & Persiese Golf, Timorsee & Arafurasee, Baai van Bengale, Die oseane
Babas
It releases vast amounts of eggs and sperm (gametes) during mass spawning events in summer, and the eggs contain saponins similar to those in adults.1
Gevaar vir mense
3 / 5: Ernstig3

Waar die feite vandaan kom

  1. Crown-of-thorns starfish (Wikipedia (CC BY-SA 4.0))
  2. Acanthaster planci (iNaturalist): name en klassifikasie.
  3. Venom Wiki: die gevaarvlak, die tipiese grootte en die spoedskatting is ons eie. Kyk hoe ons dit uitwerk: Hoe ons gevaar gradeer.

Elke feit op hierdie bladsy het 'n nommer wat na sy bron wys. As ons iets verkeerd het, jammer, ons is dierfanatici, nie 'n wetenskaplike joernaal nie. Laat weet ons by [email protected] en ons maak dit reg.

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