Abdopus aculeatus is a small octopus species in the order Octopoda. A. aculeatus has the common name of algae octopus due to its typical resting camouflage, which resembles a gastropod shell overgrown with algae. It is small in size with a mantle around the size of a small orange (c. 7 cm or 3 inches) and arms 25 cm (10 inches) in length, and is adept at mimicking its surroundings.
A. aculeatus has been described as "the only land octopus",[1] because it lives on beaches, walking from one tidal pool to the next as it hunts for crab. Many octopuses can crawl short distances on land when necessary, but no others do so routinely.
Algae octopuses are found throughout intertidal zones along the Indonesian, Philippine, and Northern Australian coastlines. They primarily live in areas with abundant sea grass coverage and occupy dens built into the sandy seafloor, which they line with small pebbles. In its resting camouflage, A. aculeatus displays mottled ochre, gray, and brown colors that resemble a shell overgrown with algae, and dark arm bars reminiscent of hermit crab legs.[2]
Algae octopuses are most active during the day, leaving their dens to forage and returning at night. In some areas (mainly Northern Australia), Algae Octopuses will forage among coral, but typically they do not. They tend to feed on small crustaceans including portunid and calappid crabs by groping and pouncing on small rocks and clusters of algae, and digging into the sand. They will chase their prey by jetting, the act of forcing water out of their siphon in order to propel their body forward, head first. Once they catch their prey they use their sharp beak to "drill" into its exoskeleton and reach the muscle within. Most often they will eat their prey on site, but on occasion when they consume their prey near their den, they will carry the exoskeleton up to one meter (3+1⁄4 feet) away to discard it.[2]
A. aculeatus demonstrates one of the most complex mating cultures of any documented octopus species. They participate in three distinct mating strategies: mate guarding, transient copulation, and sneaker mating. Larger males and females will have adjacent dens, where the male is able to extend his mating arm (hectocotylus) to the female's den, while resting in his own. These two individuals are paired and mate repeatedly for up to a week. However, the female does not remain monogamous to her mate, and may respond to sneaker mating from other males. In this instance, the guarding male may be present or away foraging, and a smaller male (the sneaker) approaches the female's den from an angle obstructed from the guarding male, sometimes camouflaged as a small female itself, to mate with the female. The third mating tactic is transient copulation, where a male will mate with an opportunistic female (typically smaller than the guarded females) that he encounters while foraging. In all cases of successful copulation, the male uses the hectocotylus to transfer sperm packages (spermatophores) to the female.[2][3] After successful mating, female will retreat to her den and cover the entrance with rubble. She remains in her den for several days, spawning multiple festoons equating to thousands of eggs. After spawning, she will remain with her eggs until they hatch, cleaning and caring for them. The hatchlings are planktonic (c. 2 mm or 3⁄32 inch in size) and will not have parental protection after hatching, as algae octopuses are semelparous, dying shortly after their young are hatched. As the hatchlings grow larger, they remain in the intertidal zones and begin to burrow into the sandy bottom.[2]
Juvenile and adult algae octopuses have a unique method of locomotion. In addition to the common tactics of swimming, crawling and jetting, algae octopuses participate in upright, bi-pedal locomotion. This is a fast method of movement used for escape and often paired with crypsis, or camouflage to mimic surrounding sea grass.[4]
Octopus bimaculoides may be a closely related species, as the two share many skin components that are the basis for their camouflage tactics, though this may also be evidence of evolutionary convergence.[2]
Abdopus aculeatus is a small octopus species in the order Octopoda. A. aculeatus has the common name of algae octopus due to its typical resting camouflage, which resembles a gastropod shell overgrown with algae. It is small in size with a mantle around the size of a small orange (c. 7 cm or 3 inches) and arms 25 cm (10 inches) in length, and is adept at mimicking its surroundings.
A. aculeatus has been described as "the only land octopus", because it lives on beaches, walking from one tidal pool to the next as it hunts for crab. Many octopuses can crawl short distances on land when necessary, but no others do so routinely.
Abdopus aculeatus est une espèce d'octopodes ayant la particularité de se déplacer sur deux tentacules, comme on peut le voir sur cette photo[5].
Cette espèce vit dans le centre de l'océan Indien. Elle est difficile à observer ce qui explique le peu de connaissances à son sujet. La découverte de son comportement est récente.
Cette bipédie est une position de défense contre ses prédateurs. Cela lui permet de se camoufler tout en se déplaçant ressemblant alors à une algue flottant entre deux eaux et se déplaçant avec le courant.
Ces octopodes intéressent particulièrement les scientifiques ainsi que les représentants du genre Marginatus car leur comportement fait preuve d'une certaine « intelligence ». Ce seraient des mollusques capables d'un raisonnement complexe plus que d'autres octopodes.
Sa reproduction est elle aussi compliquée. Les mâles élaborent des stratégies complexes pour approcher les femelles. Ils cachent leurs rayures brunes (typiques des mâles) et imitent les comportements féminins. Ceux-ci choisissent les femelles les plus grandes afin qu'elles pondent le plus d'œufs possibles. Le mâle monte la garde devant la tanière de la femelle, il tue même les autres poulpes s'approchant trop près et prouve ainsi sa virilité. Une fois la femelle fécondée, elle se retire et pond quelques dizaines de milliers d’œufs. Elle les protège et les entretient sans s’occuper d’elle-même ni même se nourrir. Elle meurt au bout d’un mois, précédant de quelques semaines le mâle.
Abdopus aculeatus est une espèce d'octopodes ayant la particularité de se déplacer sur deux tentacules, comme on peut le voir sur cette photo.
Cette espèce vit dans le centre de l'océan Indien. Elle est difficile à observer ce qui explique le peu de connaissances à son sujet. La découverte de son comportement est récente.
Cette bipédie est une position de défense contre ses prédateurs. Cela lui permet de se camoufler tout en se déplaçant ressemblant alors à une algue flottant entre deux eaux et se déplaçant avec le courant.
Ces octopodes intéressent particulièrement les scientifiques ainsi que les représentants du genre Marginatus car leur comportement fait preuve d'une certaine « intelligence ». Ce seraient des mollusques capables d'un raisonnement complexe plus que d'autres octopodes.
Abdopus aculeatus (synoniem: Octopus aculeatus) is een inktvissensoort uit de familie van de Octopodidae.[1] De wetenschappelijke naam van de soort is voor het eerst geldig gepubliceerd in 1834 door d'Orbigny.
De inktvis komt enkel in zout water voor en is in staat om van kleur te veranderen. Hij beweegt zich voort door water in zijn mantel te pompen en het er via de sifon weer krachtig uit te persen. De inktvis is een carnivoor en zijn voedsel bestaat voornamelijk uit vis, krabben, kreeften en weekdieren die ze met de zuignappen op hun grijparmen vangen.
De inktvis komt uit het geslacht Abdopus en behoort tot de familie Octopodidae.
Bronnen, noten en/of referentiesOctopus aculeatus d'Orbigny, 1834
Octopus harmandi Rochebrune, 1882
Abdopus aculeatus Octopoda takımındaki küçük bir ahtapot türüdür. A. aculeatus, tipik dinlenme kamuflajından dolayı yaygın olarak alg ahtapotu olarak da anılır. Görüntüsü su yosunuyla beraber büyümüş bir yumuşakça kabuğunu andırır. Küçük boyutlu bu ahtapotun mantosunun uzunluğu küçük bir portakal (~7 cm) kadardır ve ayaklarının uzunluğu 25 santimetredir. Çevresini taklit etme yeteneği gelişmiştir.
Aculeatus "tek kara ahtapotu",[1] olarak adlandırılır. Bunun sebebi sahillerde yaşaması ve bir gel-git havuzundan diğerine yengeç avlamak için yürüyebilmesidir. Pek çok ahtapot gerektiğinde karada kısa mesafe sürünebilir, ancak hiçbiri bunu bir rutin olarak yapmayı tercih etmez. Endonezya, Filipinler ve Kuzey Avustralya'daki gel-git bölgelerinde yaşarlar.
Abdopus aculeatus Octopoda takımındaki küçük bir ahtapot türüdür. A. aculeatus, tipik dinlenme kamuflajından dolayı yaygın olarak alg ahtapotu olarak da anılır. Görüntüsü su yosunuyla beraber büyümüş bir yumuşakça kabuğunu andırır. Küçük boyutlu bu ahtapotun mantosunun uzunluğu küçük bir portakal (~7 cm) kadardır ve ayaklarının uzunluğu 25 santimetredir. Çevresini taklit etme yeteneği gelişmiştir.
Aculeatus "tek kara ahtapotu", olarak adlandırılır. Bunun sebebi sahillerde yaşaması ve bir gel-git havuzundan diğerine yengeç avlamak için yürüyebilmesidir. Pek çok ahtapot gerektiğinde karada kısa mesafe sürünebilir, ancak hiçbiri bunu bir rutin olarak yapmayı tercih etmez. Endonezya, Filipinler ve Kuzey Avustralya'daki gel-git bölgelerinde yaşarlar.
