Citizendia
Your Ad Here

Bobtail squid
Sepiola atlantica
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Order: Sepiolida
Fioroni, 1981
Families

Idiosepiidae
Sepiolidae

Bobtail squid (order Sepiolida) are a group of cephalopods closely related to cuttlefish. The Atlantic Bobtail ( Sepiola atlantica) is a species of Bobtail squid native to the northeastern Atlantic Ocean (65ºN to 35ºN from Iceland Molluscs are animals belonging to the phylum Mollusca. There are around 250000 extant Species within the phylum with an estimated 70000 The cephalopods ( Greek plural (kephalópoda "head-feet" are the Mollusc class Cephalopoda characterized by Year 1981 ( MCMLXXXI) was a Common year starting on Thursday (link displays the 1981 Family denotes a group of People affiliated by consanguinity affinity or co-residence Idiosepius is a Genus of Bobtail squid encompassing around eight species Sepiolidae is a family of Bobtail squid encompassing 15 genera in three or four subfamilies. The cephalopods ( Greek plural (kephalópoda "head-feet" are the Mollusc class Cephalopoda characterized by Cuttlefish are marine animals of the order Sepiida belonging to the Cephalopoda class (which also includes Squid, Octopuses Bobtail squid tend to have a rounder mantle than cuttlefish and have no cuttlebone. The mantle is an important part of the anatomy of Molluscs It is the dorsal body wall which covers the visceral mass Cuttlebone, also known as cuttlefish bone, is a hard brittle internal structure found in all members of the family Sepiidae, commonly known as Cuttlefish They have eight suckered arms and two tentacles and are generally quite small (typical male mantle length being between 1 and 8 cm). [1] Sepiolids live in shallow coastal waters of the Pacific Ocean and some parts of the Indian Ocean. The Pacific Ocean is the largest of the Earth 's Oceanic divisions The Indian Ocean is the third largest of the world's Oceanic divisions covering about 20% of the water on the Earth 's surface Like cuttlefish, they can swim by either using the fins on their mantle or by jet propulsion. They are also known as dumpling squid (owing to their rounded mantle) or stubby squid.

Contents

Light organ

Bobtail squid have a symbiotic relationship with bioluminescent bacteria (Vibrio fischeri), which inhabit a special light organ in the squid's mantle. This article is about the biological phenomenon for other uses see Symbiosis (disambiguation The term symbiosis (from the Greek Bioluminescence' is the production and emission of Light by a living Organism as the result of a chemical reaction during which chemical energy is converted The Bacteria ( singular: bacterium) are a large group of unicellular Microorganisms Typically a few Micrometres in length bacteria have Vibrio fischeri is a Gram-negative rod-shaped Bacterium found globally in the marine environments The bacteria are fed a sugar and amino acid solution by the squid and in return hide the squid's silhouette when viewed from below by matching the amount of light hitting the top of the mantle. A silhouette is a view of some object or scene consisting of the outline and a featureless interior with the silhouette usually being black The organ contains filters which may alter the wavelength of luminescence closer to that of downwelling moonlight and starlight; a lens with biochemical similarities to the squid's eye to diffuse the bacterial luminescence; and a reflector which directs the light ventrally. In Physics wavelength is the distance between repeating units of a propagating Wave of a given Frequency. Moonlight is the light that comes to Earth from the Moon. This light does not originate from the Moon but is actually reflected Sunlight. The lens is a transparent biconvex structure in the Eye that along with the Cornea, helps to Refract Light to be focused Biochemistry is the study of the chemical processes in living Organisms It deals with the Structure and function of cellular components such as In fields of Anatomy, anatomical terms of location are descriptive terms to help identify relative positions or directions within a species [1]

Reproduction

Sepiolida are iteroparous and a female might lay several clutches, each of 1-400 eggs (dependent on species), over her estimated one year long lifetime. Reproduction is the Biological process by which new individual Organisms are produced In Biology, a species is one of the basic units of Biological classification and a Taxonomic rank. [1] The eggs are covered with sand and left without parental care. [1] Symbiosis with V. fischeri from the surrounding seawater is initiated immediately upon hatching, and the bacteria's colonisation of the juvenile light-organ induces morphological changes in the squid that lead to maturity. Colonisation (also known as Colonization) occurs whenever any one or more species populates a new area The term morphology in Biology refers to the outward appearance ( Shape, Structure, Colour, Pattern) of an Organism [1]

Classification

Sepiolid taxonomy within the coleoid cephalopods is currently controversial, thus their position is subject to future change. Subclass Coleoidea is the grouping of Cephalopods containing all the primarily soft-bodied creatures [1]

References

  1. ^ a b c d e f McFall-Ngai, M. The cephalopods ( Greek plural (kephalópoda "head-feet" are the Mollusc class Cephalopoda characterized by Nautiloids are a group of marine Mollusks in the subclass Nautiloidea, which all possess an external shell the best-known example being the modern Nautiluses Subclass Coleoidea is the grouping of Cephalopods containing all the primarily soft-bodied creatures Squid are marine Cephalopods of the order Teuthida, which comprises around 300 species The Cuttlefish are marine animals of the order Sepiida belonging to the Cephalopoda class (which also includes Squid, Octopuses Decapodiformes is a Superorder of Cephalopoda, which includes all species with ten limbs the name derives from the Greek word meaning ten feet Boletzkyida is an order of Cephalopods Spirulida is an order of Cephalopods comprising one extant species and several extinct taxa. Cuttlefish are marine animals of the order Sepiida belonging to the Cephalopoda class (which also includes Squid, Octopuses Idiosepius is a Genus of Bobtail squid encompassing around eight species Sepiolidae is a family of Bobtail squid encompassing 15 genera in three or four subfamilies. Squid are marine Cephalopods of the order Teuthida, which comprises around 300 species Octopodiformes is a superorder of the subclass Coleoidea. It comprises the Octopuses and the Vampire squid. J. (1999). "Consequences of evolving with bacterial symbionts: Insights from the Squid-Vibrio Associations". Annual Review of Ecology and Systematics 30: 235–256.   doi:10.1146/annurev.ecolsys.30.1.235

External links

 This cephalopod-related article is a stub. A digital object identifier ( DOI) is a permanent identifier given to an Electronic document. The cephalopods ( Greek plural (kephalópoda "head-feet" are the Mollusc class Cephalopoda characterized by You can help Wikipedia by expanding it.
© 2009 citizendia.org; parts available under the terms of GNU Free Documentation License, from http://en.wikipedia.org
 Dapyx Software network: MP3 Explorer | Ebook Manager | Zenithic