Thin-Shelled Rock Crab
EntdeckenAnimal
Thin-Shelled Rock Crab
grapsus tenuicrustatus
The Thin-Shelled Rock Crab, scientifically known as Grapsus tenuicrustatus, is a highly active and incredibly agile crustacean native to the rocky coastlines of the Indo-Pacific region. Commonly referred to as the Natal lightfoot crab, this species is famous for its astonishing speed and ability to leap across gaps in tidal rocks to evade incoming waves and hungry predators. It occupies the high intertidal zone, navigating the harsh, wave-swept splash zone with ease using its specialized gripping legs. As an ecological generalist, this crab plays a vital role in maintaining the health of coastal ecosystems. It grazes on algae covering the rocks and scavenges on organic debris, acting as both a cleanup crew and a critical link in the marine food web. Watching one of these crabs navigate the slippery, vertical faces of volcanic shorelines is a mesmerizing display of natural adaptation and athletic prowess.
Lebensraum: Found on exposed, wave-beaten rocky shores, cliffs, and jetties in the intertidal and splash zones.
Aussehen
This medium-sized crab features a highly flattened, circular carapace measuring roughly 5 to 8 centimeters in width. Its coloration ranges from a dark, mottled olive green to brownish-black, often highlighted with fine pale yellow or white speckles that match the texture of wet basalt rocks. It possesses long, flattened legs equipped with sharp, needle-like tips at the dactyls, which allow it to secure a firm grip on slick rock surfaces, alongside short but powerful claws.
ReichAnimaliaStammArthropodaKlasseMalacostracaOrdnungDecapodaFamilieGrapsidaeGattungGrapsus
Kategorie
AnimalSeltenheit
Common
Gefahr
1/5 · Sehr gering
Snaps
Mach den ersten Snap!
Interessante Fakten
Their flattened bodies are a specialized adaptation that minimizes drag from crashing ocean waves and allows them to squeeze into tight rock crevices.
This species is known as the lightfoot crab because it can run so fast that it appears to glide effortlessly across the surface of water and wet rocks.
To breathe while out of the water, they run water over their gills from a reservoir kept in their gill chambers, continuously aerating it.
Besondere Fähigkeiten
Fähigkeit
Agile Rock Leaping
This crab can leap or jump across wide gaps between wet coastal rocks to rapidly escape predators or heavy wave impacts.
Fähigkeit
Gripping Dactyls
Its legs terminate in sharp, spine-like tips that act like crampons, allowing the crab to cling securely to sheer vertical cliffs amidst crashing waves.
Fähigkeit
Sacrificial Autotomy
It can voluntarily drop its limbs when grabbed by a predator and later regenerate them during subsequent molting cycles.
Maße und Details
- Länge
- 5-8 cm
- Gewicht
- 0.05-0.15 kg
- Lebenserwartung
- 2-4 Jahre
- Top Speed
- 8 km/h
- Gelegegröße
- 5000-20000
- Brutzeit
- 14-28 Tage
Ernährung und Fütterung
Primarily grazes on marine algae growing on intertidal rocks, but opportunistically scavenges animal matter and preys on small invertebrates.
Hauptnahrung
- Filamentous algae
- Sea lettuce
- Marine detritus
- Small gastropods
- Carrion
Nahrungssuche
- Foraging And Grazing
Ökologische Zusammenhänge
eaten by
Day Octopus
Octopus cyanea
Preys upon the crab in tidepools and lower rocky shelves.
eaten by
Yellow-edged Moray
Gymnothorax flavimarginatus
Hunts the crab when they venture too close to submerged rocky crevices.
hunts
Sea Lettuce
Ulva lactuca
Serves as a primary food source for the crab as it grazes on rock surfaces.
Merkmale
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Sicherheit
Gefahr
1/5 · Sehr gering
Noch keine besonderen Sicherheitshinweise.
Häufig gestellte Fragen
Wie identifiziert man Thin-Shelled Rock Crab?
Der einfachste Weg, Thin-Shelled Rock Crab zu bestimmen, ist die Verwendung der Naturführer-App Snappit.
Was ist der/die/das länge von Thin-Shelled Rock Crab?
5-8 cm
Was ist der/die/das gewicht von Thin-Shelled Rock Crab?
0.05-0.15 kg
Was ist der/die/das lebenserwartung von Thin-Shelled Rock Crab?
2-4 Jahre
Was ist der/die/das top Speed von Thin-Shelled Rock Crab?
8 km/h
Was frisst Thin-Shelled Rock Crab?
Primarily grazes on marine algae growing on intertidal rocks, but opportunistically scavenges animal matter and preys on small invertebrates.
Wo findet man Thin-Shelled Rock Crab normalerweise?
Found on exposed, wave-beaten rocky shores, cliffs, and jetties in the intertidal and splash zones.
Wie jagt Thin-Shelled Rock Crab?
Foraging And Grazing
Snap-Karte
Zoome hinein, um Cluster aufzulösen und zu sehen, wo dieses Objekt fotografiert wurde.
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