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Ram's Horn Squid (Spirula spirula) is a unique and peculiar species of mollusc which constitutes a family (Spirulidae) and order (Spirulida) by itself. Live specimens are very rare because they are deep dwellers. It is also known as Little Post Horn Squid or simply by its genus Spirula. Image File history File links Spiruladraw. ...
Scientific classification or biological classification is how biologists group and categorize extinct and living species of organisms (as opposed to folk taxonomy). ...
Phyla Animals are a major group of organisms, classified as the kingdom Animalia or MetaÂzoa. ...
Classes Caudofoveata Aplacophora Polyplacophora - Chitons Monoplacophora Bivalvia - Bivalves Scaphopoda - Tusk shells Gastropoda - Snails and Slugs Cephalopoda - Squids, Octopuses, etc. ...
Orders Subclass Nautiloidea †Plectronocerida †Ellesmerocerida †Actinocerida †Pseudorthocerida †Endocerida †Tarphycerida †Oncocerida †Discosorida Nautilida †Orthocerida †Ascocerida †Bactritida Subclass †Ammonoidea †Goniatitida †Ceratitida †Ammonitida Subclass Coleoidea †Belemnoidea †Aulacocerida †Belemnitida †Hematitida †Phragmoteuthida Neocoleoidea (most living cephalopods) Sepiida Sepiolida Spirulida Teuthida Octopoda Vampyromorphida The cephalopods (head-foot) are the mollusk class Cephalopoda characterized by bilateral body...
Orders Aulacocerida (extinct) Hematitida (extinct) Phragmoteuthida (extinct) Belemnitida (extinct) Sepiida Sepiolida Spirulida Teuthida Octopoda Vampyromorphida Subclass Coleoidea is the grouping of cephalopods containing all the primarily soft-bodied creatures. ...
Orders Sepiida Sepiolida Spirulida Teuthida Decapodiformes is a superorder of Cephalopoda, which includes all species with ten limbs; the name derives from the Latin meaning ten feet. ...
1919 (MCMXIX) was a common year starting on Wednesday (see link for calendar). ...
Sir Richard Owen and Dinornis bird skeleton Sir Richard Owen (July 20, 1804 - December 18, 1892) was an English biologist, comparative anatomist and palaeontologist. ...
Charles Darwin 1836 was a leap year starting on Friday (see link for calendar). ...
Jean-Baptiste Lamarck Jean-Baptiste Pierre Antoine de Monet, Chevalier de Lamarck (August 1, 1744 – December 28, 1829) was a French naturalist and an early proponent of the idea that evolution occurred and proceeded in accordance with natural laws. ...
1799 was a common year starting on Tuesday (see link for calendar). ...
In biology, binomial nomenclature is the formal method of naming species. ...
Carolus Linnaeus Carl Linnaeus, also known after his ennoblement as , (May 23, 1707 – January 10, 1778), was a Swedish botanist, physician and zoologist[1] who laid the foundations for the modern scheme of nomenclature. ...
1758 was a common year starting on Sunday (see link for calendar). ...
Classes Caudofoveata Aplacophora Polyplacophora - Chitons Monoplacophora Bivalvia - Bivalves Scaphopoda - Tusk shells Gastropoda - Snails and Slugs Cephalopoda - Squids, Octopuses, etc. ...
In biological classification, family (Latin: familia, plural familiae) is 1) a rank or 2) a taxon in that rank. ...
Scientific classification or biological classification refers to how biologists group and categorize extinct and living species of organisms. ...
In biology, a genus (plural genera) is a taxonomic grouping. ...
Description
Spirula have a squid-like body between 35 mm and 45 mm long. They are decapods, with 8 arms and 2 longer tentacles, all with suckers. The arms and tentacles can all be withdrawn completely into the mantle. The most distinctive feature is the buoyancy chamber, an internal shell in the shape of an open planispiral (a flat spiral where the coils do not touch each other). The chamber keeps the spirula in a vertical, head-down attitude. The posterior also contains a light-emitting organ that can glow for hours at a time. Suborders Squids are a large, diverse group of marine cephalopods. ...
A millimetre (American spelling: millimeter), symbol mm is an SI unit of length that is equal to one thousandth of a metre. ...
Orders Sepiida Sepiolida Spirulida Teuthida Decapodiformes is a superorder of Cephalopoda, which includes all species with ten limbs; the name derives from the Latin meaning ten feet. ...
Tentacles can refer to the elongated flexible organs that are present in many invertebrates, and sometimes to the hairs of the leaves of some insectivorous plants. ...
The mantle is an organ found in mollusks. ...
Habitat Spirula inhabit continental slopes with water depths of 1000 to 2000 metres. By day they dwell at a depth of 550 to 700 metres and sometimes as deep as 1000 metres. By night, they rise to a depth of 100 to 300 metres.
Distribution Most sources cite them as tropical, and they are observed to be plentiful in the seas around the Canary Islands. However, significant quantities of shells from dead spirula are washed ashore in temperate regions, such as the western coasts of South Africa and New Zealand. These have possibly been carried long distances by ocean currents. The tropics are the geographic region of the Earth centered on the equator and limited in latitude by the two tropics: the Tropic of Cancer in the north and the Tropic of Capricorn in the southern hemisphere. ...
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Taxonomy The order Spirulida also contains two extinct suborders - Groenlandibelina (incl. extinct families Groenlandibelidae and Adygeyidae) and Belopterina (incl. extinct families Belemnoseidae and Belopteridae).
External links - CephBase: Ram's Horn Squid
- TONMO.com Spirulidae Forum
 Spirula spirula, Mission Beach, National Park, Queensland, Australia, 2002
 Spirula spirula, Mission Beach, National Park, Queensland, Australia, 2002 |
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