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Helicocranchia Joubini
''Helicocranchia'' is a genus of small glass squids from the family Cranchiidae, known as piglet squid. They are characterized by possessing a very large funnel and in having a pair of small paddle-like fins which are attached to a part of the gladius which sits above the muscular mantle. These squid undergo a slow descent starting near the surface as paralarvae Paralarvae (singular: ''paralarva'') are young cephalopods in the planktonic stages between hatchling and subadult. This stage differs from the larval stage of animals that undergo true metamorphosis. Paralarvae have been observed only in mem ... moving down to lower mesopelagic depths as near-adults. The genus contains bioluminescent species. Species There are three species of Helicocranchia: *'' Helicocranchia joubini'' (Voss, 1962) *'' Helicocranchia papillata'' (Voss, 1960) *'' Helicocranchia pfefferi'' Massy, 1907 References External links CephBase: Helicocranchia [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Helicocranchia Pfefferi
''Helicocranchia pfefferi'', the banded piglet squid, is a small squid of the genus '' Helicocranchia''. Adults of this species are mesopelaegic. Physical characteristics The average size of adult ''H. pfefferi'' is in mantle length (ML). The body consists of a large funnel with small paddle-like fins. They have small tentacles above their eyes. The funnel does not have valves, but contains a dorsal pad with three papillae as organs. Paddle-shaped fins are attached to a part of the gladius. ''H. pfefferi'' has a single ocular photophore and does not have photophores at its arm tips. Habitat As paralarvae (<30 mm ML), they live near the surface of the oceans, between 100 m and 200 m deep. They descend to the as they mature, but exhibit a |
Paralarvae
Paralarvae (singular: ''paralarva'') are young cephalopods in the planktonic stages between hatchling and subadult. This stage differs from the larval stage of animals that undergo true metamorphosis. Paralarvae have been observed only in members of the orders Octopoda and Teuthida. The term was first introduced by Richard E. Young and Robert F. Harman in 1988. Paralarvae usually spend an uncertain amount of time in the plankton and then typically descend to an adult habitat in the mesopelagic or bathypelagic zone. Their population abundance is dependent on the variation of mortality rates during the planktonic period. See also *Larva *Crustacean larvae Crustaceans may pass through a number of larval and immature stages between hatching from their eggs and reaching their adult form. Each of the stages is separated by a moult, in which the hard exoskeleton is shed to allow the animal to grow. The ... References Further reading *Bigelow, Keith A. "Age and growth in p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cephalopod Genera
A cephalopod is any member of the molluscan class Cephalopoda (Greek plural , ; "head-feet") such as a squid, octopus, cuttlefish, or nautilus. These exclusively marine animals are characterized by bilateral body symmetry, a prominent head, and a set of arms or tentacles (muscular hydrostats) modified from the primitive molluscan foot. Fishers sometimes call cephalopods "inkfish", referring to their common ability to squirt ink. The study of cephalopods is a branch of malacology known as teuthology. Cephalopods became dominant during the Ordovician period, represented by primitive nautiloids. The class now contains two, only distantly related, extant subclasses: Coleoidea, which includes octopuses, squid, and cuttlefish; and Nautiloidea, represented by ''Nautilus'' and ''Allonautilus''. In the Coleoidea, the molluscan shell has been internalized or is absent, whereas in the Nautiloidea, the external shell remains. About 800 living species of cephalopods have been ide ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Squid
True squid are molluscs with an elongated soft body, large eyes, eight arms, and two tentacles in the superorder Decapodiformes, though many other molluscs within the broader Neocoleoidea are also called squid despite not strictly fitting these criteria. Like all other cephalopods, squid have a distinct head, bilateral symmetry, and a mantle. They are mainly soft-bodied, like octopuses, but have a small internal skeleton in the form of a rod-like gladius (cephalopod), gladius or pen, made of chitin. Squid diverged from other cephalopods during the Jurassic and occupy a similar role to teleost fish as open water predators of similar size and behaviour. They play an important role in the open water food web. The two long tentacles are used to grab prey and the eight arms to hold and control it. The beak then cuts the food into suitable size chunks for swallowing. Squid are rapid swimmers, moving by Aquatic locomotion#Jet propulsion, jet propulsion, and largely locate their ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Helicocranchia Papillata
''Helicocranchia'' is a genus of small glass squids from the family Cranchiidae, known as piglet squid. They are characterized by possessing a very large funnel and in having a pair of small paddle-like fins which are attached to a part of the gladius which sits above the muscular mantle. These squid undergo a slow descent starting near the surface as paralarvae moving down to lower mesopelagic depths as near-adults. The genus contains bioluminescent species. Species There are three species of Helicocranchia: *''Helicocranchia joubini'' (Voss, 1962) *'' Helicocranchia papillata'' (Voss, 1960) *''Helicocranchia pfefferi ''Helicocranchia pfefferi'', the banded piglet squid, is a small squid of the genus '' Helicocranchia''. Adults of this species are mesopelaegic. Physical characteristics The average size of adult ''H. pfefferi'' is in mantle length (ML). Th ...'' Massy, 1907 References External links CephBase: Helicocranchia [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Helicocranchia Joubini
''Helicocranchia'' is a genus of small glass squids from the family Cranchiidae, known as piglet squid. They are characterized by possessing a very large funnel and in having a pair of small paddle-like fins which are attached to a part of the gladius which sits above the muscular mantle. These squid undergo a slow descent starting near the surface as paralarvae Paralarvae (singular: ''paralarva'') are young cephalopods in the planktonic stages between hatchling and subadult. This stage differs from the larval stage of animals that undergo true metamorphosis. Paralarvae have been observed only in mem ... moving down to lower mesopelagic depths as near-adults. The genus contains bioluminescent species. Species There are three species of Helicocranchia: *'' Helicocranchia joubini'' (Voss, 1962) *'' Helicocranchia papillata'' (Voss, 1960) *'' Helicocranchia pfefferi'' Massy, 1907 References External links CephBase: Helicocranchia [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Katharina M
Katharina is a feminine given name. It is a German form of Katherine. It may refer to: In television and film: *Katharina Bellowitsch, Austrian radio and TV presenter *Katharina Mückstein, Austrian film director *Katharina Thalbach, German actress and film director *Katherine Pierce, a character in ''The Vampire Diaries'' originally named Katharina Petrova. In artistry: *Katharina Fröhlich, lover of Franz Grillparzer *Katharina Rapp, German artist In other fields: *Katharina Baunach, German footballer *Katharina Dalton, British physician and pioneer in the research of premenstrual stress syndrome. *Katharina Klafsky, Hungarian operatic singer *Katharina von Bora, German Catholic nun who was an early convert to Protestantism. *Katharina von Zimmern (1478-1547), last abbess of the Fraumünster Abbey See also *320 Katharina, small Main belt asteroid *''Katharina'', a genus of chiton mollusc in the family Mopaliidae *The Lost Honour of Katharina Blum, 1974 novel by Heinrich Böll ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mesopelagic
The mesopelagic zone (Greek μέσον, middle), also known as the middle pelagic or twilight zone, is the part of the pelagic zone that lies between the photic epipelagic and the aphotic bathypelagic zones. It is defined by light, and begins at the depth where only 1% of incident light reaches and ends where there is no light; the depths of this zone are between approximately 200 to 1,000 meters (~656 to 3,280 feet) below the ocean surface. The mesopelagic zone occupies about 60% of the planet's surface and about 20% of the ocean's volume, amounting to a large part of the total biosphere. It hosts a diverse biological community that includes bristlemouths, blobfish, bioluminescent jellyfish, giant squid, and a myriad of other unique organisms adapted to live in a low-light environment. It has long captivated the imagination of scientists, artists and writers; deep sea creatures are prominent in popular culture. Physical conditions The mesopelagic zone includes the reg ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mantle (mollusc)
The mantle (also known by the Latin word pallium meaning mantle, robe or cloak, adjective pallial) is a significant part of the anatomy of molluscs: it is the dorsal body wall which covers the visceral mass and usually protrudes in the form of flaps well beyond the visceral mass itself. In many species of molluscs the epidermis of the mantle secretes calcium carbonate and conchiolin, and creates a shell. In sea slugs there is a progressive loss of the shell and the mantle becomes the dorsal surface of the animal. The words mantle and pallium both originally meant cloak or cape, see mantle (vesture). This anatomical structure in molluscs often resembles a cloak because in many groups the edges of the mantle, usually referred to as the ''mantle margin'', extend far beyond the main part of the body, forming flaps, double-layered structures which have been adapted for many different uses, including for example, the siphon. Mantle cavity The ''mantle cavity'' is a central fea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anne Letitia Massy
Annie Letitia Massy (29 January 1868 – 16 April 1931) was a self-taught marine biologist, ornithologist, and an internationally recognised expert on molluscs, in particular cephalopods. She was one of the founders of the Irish Society for the Protection of Birds in 1904. Many of the details of her life are unknown which is attributed to the fact that she is often described as a shy and retiring person, with no known photograph of her in existence. Early life and education Massy was born in Netley, Hampshire in 1868. The family home was Stagdale Lodge close to the border of County Tipperary and County Limerick. She was the third child of four to parents Annie and Hugh Deane Massy, descendants of Hamon de Massey. Her father was a surgeon in the British Army and was probably working at the Royal Victoria military hospital in Netley at the time of Annie’s birth. She grew up in Malahide, living close to the well known mollusc collecting location the Velvet Strand, spending ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gladius (cephalopod)
The gladius (plural: ''gladii''), or pen, is a hard internal bodypart found in many cephalopods of the superorder Decapodiformes (particularly squids) and in a single extant member of the Octopodiformes, the vampire squid (''Vampyroteuthis infernalis''). It is so named for its superficial resemblance to the Roman short sword of the same name, and is a vestige of the ancestral mollusc shell, which was external. The gladius is located dorsally within the mantle and usually extends for its entire length. Composed primarily of chitin, it lies within the shell sac, which is responsible for its secretion. Gladii are known from a number of extinct cephalopod groups, including teudopseids (''e.g.'' '' Actinosepia'', '' Glyphiteuthis'', '' Muensterella'', '' Palaeololigo'', '' Teudopsinia'', ''Teudopsis'', and ''Trachyteuthis''), loligosepiids (''e.g.'' '' Geopeltis'', '' Jeletzkyteuthis'', and '' Loligosepia''), and prototeuthids (''e.g.'' ''Dorateuthis'', '' Paraplesioteuthis'', ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cranchiidae
The family Cranchiidae comprises the approximately 60 species of glass squid, also known as cockatoo squid, cranchiid, cranch squid, or bathyscaphoid squid. Cranchiid squid occur in surface and midwater depths of open oceans around the world. They range in mantle length from to over , in the case of the colossal squid. The common name, glass squid, derives from the transparent nature of most species. Cranchiid squid spend much of their lives in partially sunlit shallow waters, where their transparency provides camouflage. They are characterised by a swollen body and short arms, which bear two rows of suckers or hooks. The third arm pair is often enlarged. Many species are bioluminescent organisms and possess light organs on the undersides of their eyes, used to cancel their shadows. Eye morphology varies widely, ranging from large and circular to telescopic and stalked. A large, fluid-filled chamber containing ammonia solution is used to aid buoyancy. This buoyancy system is uni ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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