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Latimeria chalumnae, commonly known as the West Indian Ocean Coelacanth, is a lobe-finned fish belonging to the order Coelacanthiformes. It is one of two extant species of coelacanth, the other being Latimeria menadoensis (Indonesian Coelacanth). This species is renowned as a 'living fossil' due to its striking resemblance to fossil coelacanths dating back millions of years, and its discovery in 1938 was one of the most significant zoological finds of the 20th century. It possesses unique morphological features, including paired lobe fins that move in an alternating pattern, a tripartite tail fin, and a hinged intracranial joint. These fish are deep-water dwellers, typically found in volcanic caves and rocky crevices.
Caratteristiche fisiche
- Forma del corpo
- torpedo
- Colorazione
- Dark steel blue to brownish-grey with irregular white or pale spots, which are unique to each individual and can be used for identification.
- Tipo di squame
- ganoid
- Posizione della bocca
- terminal
- Caratteristiche distintive
- Paired lobe fins (pectoral, pelvic, anal, and second dorsal) supported by bone and muscle, resembling limbs., Tripartite caudal fin with a small central lobe (epicaudal fin)., Hinged intracranial joint, allowing the upper jaw to be raised independently., Thick, cosmoid scales (though often described as modified cosmoid or placoid-like)., Oil-filled notochord instead of a vertebral column in adults., Rostral organ, a unique electroreceptive sensory organ in the snout.
- Pinna dorsale
- Two dorsal fins: a spiny first dorsal fin and a lobe-finned second dorsal fin.
- Pinna caudale
- Tripartite caudal fin with a prominent central lobe (epicaudal fin).
- Pinna pettorale
- Paired, fleshy, lobe-like pectoral fins, resembling limbs.
- Pinne distintive
- All paired fins (pectoral, pelvic, anal, and second dorsal) are lobe-finned, meaning they are supported by a central skeletal element and muscle, allowing for greater articulation than ray-finned fish.
Consigli per l'identificazione
Overall Body Shape and Coloration
Large, robust, torpedo-shaped body, dark steel blue to brownish-grey with distinctive white or pale spots.
Lobe Fins
The most striking feature: all paired fins (pectoral, pelvic, anal, and second dorsal) are fleshy and lobe-like, resembling limbs, unlike the ray-fins of most other fish.
Tripartite Caudal Fin
The tail fin has three distinct lobes, with a small, fleshy central lobe (epicaudal fin) extending beyond the upper and lower lobes.
Scales
Large, thick, overlapping scales that are rough to the touch.
Size
Adults can reach lengths of up to 2 meters (6.5 feet) and weigh up to 90 kg (200 lbs).
Habitat
- Tipo di acqua
- saltwater
- Profondità
- Typically found between 100 and 400 meters (330-1300 feet), occasionally deeper.
- Ambiente
- Deep-water volcanic caves, rocky reefs, and crevices, often associated with submarine canyons. They prefer stable temperatures and low light conditions.
- Areale geografico
- Primarily found off the Comoros Islands (Grande Comore, Anjouan, Moheli), with isolated populations reported off the coasts of South Africa, Mozambique, and Madagascar in the western Indian Ocean.
Informazioni sull'acquario
- Livello di cura: expert
- Temperamento: peaceful
- Dieta: carnivore
- Dimensione minima della vasca: Not suitable for aquaria
- Temperatura: 18-22°C (64-72°F)
- Livello di pH: 7.8-8.2
- Durezza: High (marine)
- Compatibilità: Not applicable for aquaria; solitary or in small groups in natural habitat.
- Requisiti speciali: Not suitable for aquaria due to extreme depth requirements, specialized diet, and conservation status. Any attempt to keep them in captivity would be unethical and likely fatal to the animal.
Informazioni in natura
- Stato di conservazione: critically endangered
- Stagionalità: No distinct seasonal behavior patterns observed; present year-round in their deep-water habitats.
- Prezzo di mercato: Not applicable; illegal to trade
- Importanza commerciale: none
- Sapore: Oily and unpalatable
- Consistenza: Oily and waxy
- Valore nutrizionale: High oil content, but not consumed due to conservation status and unpalatability.
Fatti chiave
Living Fossilevolution
Latimeria chalumnae is famously known as a 'living fossil' because its morphology has remained virtually unchanged for millions of years, closely resembling fossil coelacanths from the Devonian period (around 400 million years ago).
Rediscoveryamazing
Thought to have gone extinct with the dinosaurs 66 million years ago, the first living specimen was caught off the coast of South Africa in 1938, causing a sensation in the scientific community.
Unique Fin Movementbehavior
Coelacanths move their paired lobe fins in an alternating, limb-like fashion, similar to a trotting horse, which is unique among fish and provides insight into the evolution of tetrapod limbs.
Intracranial Jointinteresting
They possess a unique hinged joint in their skull, allowing them to open their mouths exceptionally wide to engulf prey, a feature not found in any other living vertebrate.
Ovoviviparous Reproductionbehavior
Coelacanths are ovoviviparous, meaning the eggs hatch inside the mother's body, and the young develop internally, feeding on yolk sacs, before being born live. Gestation is estimated to be very long, possibly up to 5 years.
Electroreceptioninteresting
They have a specialized rostral organ in their snout that is believed to detect weak electrical fields, aiding in the detection of prey in their deep, dark habitat.
Informazioni di sicurezza
Sicuro- Livello di sicurezza: safe
- Velenoso: No
- Commestibilità: not recommended
- Note sul maneggio: No specific handling precautions are needed regarding venom or toxicity. However, due to its critically endangered status and deep-water habitat, direct interaction is extremely rare and should be avoided. Any accidental capture should result in immediate, careful release.
Specie simili
Indonesian Coelacanth
Latimeria menadoensis
L. menadoensis is typically brownish-grey with golden flecks, whereas L. chalumnae is dark steel blue with white spots. Genetic analysis also confirms them as distinct species, with L. menadoensis found exclusively in the waters off Sulawesi, Indonesia.
Lungfish
Various species (e.g., Neoceratodus forsteri)
While lungfish also possess lobe-like fins, their body shape, scale structure, and overall morphology are distinctly different. Lungfish are freshwater inhabitants and have functional lungs, which coelacanths lack. Coelacanths have a unique tripartite tail and intracranial joint not found in lungfish.
Classificazione scientifica
- Regno
- Animalia
- Phylum
- Chordata
- Classe
- Sarcopterygii
- Ordine
- Coelacanthiformes
- Famiglia
- Latimeriidae
- Genere
- Latimeria
- Specie
- chalumnae
Esplora West Indian Ocean Coelacanth
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