scholarly journals Variability of conch morphology in a cephalopod species from the Cambrian to Ordovician transition strata of Siberia

2020 ◽  
Vol 65 ◽  
Author(s):  
Jerzy Dzik
Keyword(s):  
Cephalopod Species

Cephalopod species in the diet of large pelagic fish (sharks and billfishes) in Ecuadorian waters

2016 ◽  
Vol 173 ◽  
pp. 159-168 ◽  
Author(s):  
R. Rosas-Luis ◽  
P. Loor-Andrade ◽  
M. Carrera-Fernández ◽  
J.E. Pincay-Espinoza ◽  
C. Vinces-Ortega ◽  
...  
Keyword(s):  
Pelagic Fish ◽  
Cephalopod Species

scholarly journals Cuttlefish use stereopsis to strike at prey

2020 ◽  
Vol 6 (2) ◽  
pp. eaay6036 ◽  
Author(s):  
R. C. Feord ◽  
M. E. Sumner ◽  
S. Pusdekar ◽  
L. Kalra ◽  
P. T. Gonzalez-Bellido ◽  
...  
Keyword(s):  
Information Processing ◽  
Visual Information ◽  
Convergent Evolution ◽  
Visual Fields ◽  
Three Dimensional ◽  
Visual Information Processing ◽  
Depth Information ◽  
Cephalopod Species ◽  
Left And Right

The camera-type eyes of vertebrates and cephalopods exhibit remarkable convergence, but it is currently unknown whether the mechanisms for visual information processing in these brains, which exhibit wildly disparate architecture, are also shared. To investigate stereopsis in a cephalopod species, we affixed “anaglyph” glasses to cuttlefish and used a three-dimensional perception paradigm. We show that (i) cuttlefish have also evolved stereopsis (i.e., the ability to extract depth information from the disparity between left and right visual fields); (ii) when stereopsis information is intact, the time and distance covered before striking at a target are shorter; (iii) stereopsis in cuttlefish works differently to vertebrates, as cuttlefish can extract stereopsis cues from anticorrelated stimuli. These findings demonstrate that although there is convergent evolution in depth computation, cuttlefish stereopsis is likely afforded by a different algorithm than in humans, and not just a different implementation.

scholarly journals Cephalopods in marine predator diet assessments: why identifying upper and lower beaks is important

2011 ◽  
Vol 68 (9) ◽  
pp. 1857-1864 ◽  
Author(s):  
José C. Xavier ◽  
Richard A. Phillips ◽  
Yves Cherel
Keyword(s):  
Marine Science ◽  
Relative Importance ◽  
Future Studies ◽  
Marine Predator ◽  
Predator Diet ◽  
Cephalopod Species ◽  
Diomedea Exulans ◽  
Wandering Albatross ◽  
The World ◽  
Different Parts

AbstractXavier, J. C., Phillips, R. A., and Cherel, Y. 2011. Cephalopods in marine predator diet assessments: why identifying upper and lower beaks is important. – ICES Journal of Marine Science, 68: 1857–1864. Cephalopods are components of the diet of many predators worldwide. They are identified mainly using their chitinized upper and lower beaks, but because it has been assumed that the number of upper and lower beaks would be the same in predator diet samples, more effort has been put into creating keys for the lower beaks, which are more easily identifiable from morphology. A test is made of whether the number of upper and lower beaks differs in diet samples collected from a major cephalopod predator, the wandering albatross (Diomedea exulans), potential biases in the estimation of predator diets are assessed, and upper:lower beak ratios in published studies of other seabirds, seals, whales, and fish from different parts of the world reviewed. The ratio of upper to lower beaks in diet samples from wandering albatrosses varied greatly in a single year (from 69.6% more lower beaks to 59% more upper beaks), and between years (from 0.5 to 32.1% more upper beaks), and biases were greater for certain cephalopod species, resulting in underestimation of their relative importance. Future studies need to consider using both upper and lower beaks to improve the assessment of the contribution of different cephalopods to predator diets.

scholarly journals Occurrence of ascaridoid nematodes in Illex coindetii, a commercially relevant cephalopod species from the Ligurian Sea (Northwest Mediterranean Sea)

Food Control ◽  
2020 ◽  
Vol 116 ◽  
pp. 107311
Author(s):  
Vasco Menconi ◽  
Paolo Pastorino ◽  
Erika Astrid Virginie Burioli ◽  
Marzia Righetti ◽  
Tommaso Scanzio ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Ligurian Sea ◽  
Cephalopod Species

scholarly journals Life history traits of the temperate mini-maximalist Idiosepius notoides, (Cephalopoda: Sepioidea)

2003 ◽  
Vol 83 (6) ◽  
pp. 1297-1300 ◽  
Author(s):  
Sean R. Tracey ◽  
Mike A. Steer ◽  
Gretta T. Pecl
Keyword(s):  
Life History ◽  
Growth Rates ◽  
Sexual Maturity ◽  
Life History Traits ◽  
Mantle Length ◽  
Power Curve ◽  
Short Life ◽  
Gender Dimorphism ◽  
Cephalopod Species

Age, growth and maturation of the temperate ‘mini-maximalist’ Idiosepius notoides from Tasmania is described and compared with those of its tropical congener Idiosepius pygmaeus. Using statolith increment analysis, growth of I. notoides was best described by a power curve with a maximum age of 115 days recorded. Males have a shorter lifespan than females, however growth rates were similar between the sexes. Idiosepius notoides grows to a larger size than its tropical counterpart. Onset of maturity in I. notoides occurred at an age of approximately 68 days for males and 88 days for females compared to 45–60 days for I. pygmaeus. Size at onset of sexual maturity was analogous between the two species, with males mature at approximately 6·5 mm mantle length (ML) and females at 14·0 mm ML. Idiosepius notoides, like I. pygmaeus, is a small short-lived sepioid with significant gender dimorphism and the capacity to spawn multiple times throughout its short life. This research supports the concept of similar cephalopod species living longer and growing larger in cooler environments.

Molecular identification of cephalopod species by FINS and PCR-RFLP of a cytochrome b gene fragment

2003 ◽  
Vol 217 (6) ◽  
pp. 524-529 ◽  
Author(s):  
Mar�a Jos� Chapela ◽  
Carmen G. Sotelo ◽  
Ricardo I. P�rez-Mart�n
Keyword(s):  
Cytochrome B ◽  
Molecular Identification ◽  
Cytochrome B Gene ◽  
Gene Fragment ◽  
Cephalopod Species ◽  
Pcr Rflp

scholarly journals Radioisotopes Demonstrate the Contrasting Bioaccumulation Capacities of Heavy Metals in Embryonic Stages of Cephalopod Species

PLoS ONE ◽  
2011 ◽  
Vol 6 (11) ◽  
pp. e27653 ◽  
Author(s):  
Thomas Lacoue-Labarthe ◽  
Roger Villanueva ◽  
Claude Rouleau ◽  
François Oberhänsli ◽  
Jean-Louis Teyssié ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Cephalopod Species

Cephalopods as prey. III. Cetaceans

1996 ◽  
Vol 351 (1343) ◽  
pp. 1053-1065 ◽  
Keyword(s):  
Polar Regions ◽  
Oceanic Water ◽  
Cetacean Species ◽  
Commercial Fish ◽  
Cephalopod Species ◽  
The North ◽  
Continental Shelf Water ◽  
Continental Shelves ◽  
Regional Estimates ◽  
The North Pacific

Over 80 % of odontocete species and two balaen whale species include cephalopods in their diet regularly. In 28 odontocetes they comprise the main food. Predominently cephalopod-eating species are found in the Physeteridae, Ziphiidae, Phocaenidae and Delphinidae. By far the most important of the 28 families of cephalopods represented in the diet of cetaceans are the oceanic Ommastrephidae, Histioteuthidae and the Cranchiidae, with the neritic Loliginidae assuming most importance on the continental shelves. Onychoteuthidae and Gonatidae assume greater importance in polar regions and the North Pacific. The other 22 families form a reservoir from which various cetaceans eat opportunistically and as their sizes permit. There are probably less than 60 cephalopod species regularly in the diet of cetaceans. Species composition of the food varies regionally, seasonally and annually. Locally, the greatest difference is found between cetaceans that live in oceanic water and continental shelf water. There is a positive correlation between the size of the prey and both the size of pelagic feeding cetacean species and the growth stage within a species. This leads to some partitioning of the food and less competition. Broad estimates show that the biomass of oceanic cephalopods consumed annually by the largest odontocete, Physeter catodon , may be over twice the biomass of fish caught by man. Regional estimates show that consumption by cetaceans of little known cephalopod species may greatly exceed the local catches of commercial fish.

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