Octopuses
نویسنده
چکیده
What are they? Octopuses and their relatives, the cuttlefish and squids, form the class of modern cephalopods (coleoids). These are soft-bodied molluscan invertebrates like garden snails or sea hares (Aplysia). The modern cephalopods appeared in the sea at the same time as bony fish; more than 200 million years ago. The old cephalopods are virtually extinct — their only living representative is the shell-bearing Nautilus. Modern and old cephalopods separated about 450 million years ago and the modern cephalopods have evolved into highly effective hunters which compete with fish in their marine habitat.
منابع مشابه
Research Proposal Do Octopuses Think like Vertebrates? a New Comparative Test
Research Proposal Do Octopuses Think Like Vertebrates? A New Comparative Test by Dakota E. McCoy Introduction Octopuses are non-social, short-lived invertebrates that are genetically and physically distant from the accepted cadre of intelligent animals: the social and long-lived primates, birds, dolphins, and elephants (Mather 1995). Yet a growing body of research suggests that octopuses have m...
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This study exposed 8 Enteroctopus dofleini separately to 2 unfamiliar individual humans over a 2-week period under differing circumstances. One person consistently fed the octopuses and the other touched them with a bristly stick. Each human recorded octopus body patterns, behaviors, and respiration rates directly after each treatment. At the end of 2 weeks, a body pattern (a dark Eyebar) and 2...
متن کاملEvidence That Octopus Is Colour Blind
1. Six octopuses were trained on a series of visual discrimination tasks where the discriminanda were presented simultaneously, and where different tasks alternated in a single training session. 2. All the octopuses could make discriminations based on brightness and orientation over the same period of time. 3. Over a period in which all octopuses discriminated a black from a white vertical rect...
متن کاملSeasonal Variations of Fat and Fatty Acid Composition in Muscle Tissues of Mediterranean Octopuses
The effects of seasons on lipid and fatty acid profiles of muscle types (mantle and arm) of Mediterranean octopuses (common octopus-Octopus vulgaris and musky octopus-Eledone moschata) were investigated. The results showed that lipid levels ranged from 0.75% to 1.60% in both muscle types of octopuses which were considered as lean. Lipid levels in mantle tissues of both octopus species were hig...
متن کاملPull or Push? Octopuses Solve a Puzzle Problem
Octopuses have large brains and exhibit complex behaviors, but relatively little is known about their cognitive abilities. Here we present data from a five-level learning and problem-solving experiment. Seven octopuses (Octopus vulgaris) were first trained to open an L shaped container to retrieve food (level 0). After learning the initial task all animals followed the same experimental protoco...
متن کاملOctopus tetricus (Mollusca: Cephalopoda) as an ecosystem engineer ; Octopus tetricus (Mollusca: Cephalopoda) como ingeniero de ecosistemas
The Sydney octopus (Octopus tetricus) occurs in unusual numbers on a shell bed of its prey remains that have accumulated as an extended midden where additional octopuses excavate dens. Here, O tetricus are ecosystem engineers, organisms that modulate availability of resources to other species and to their own species by causing physical state changes in materials. A community of invertebrate gr...
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ورودعنوان ژورنال:
- Current Biology
دوره 18 شماره
صفحات -
تاریخ انتشار 2008