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Trachymedusae
Trachymedusae belong to the phylum Cnidaria and the class Hydrozoa, among the 30 genera are 5 families containing around 50 species in all, the family Rhopalonematidae has the greatest diversity. Description Trachymedusae are identifiable by their umbrella edge which lacks any lobes. The tentacles at the edge of the umbrellas are solid or solid and hollow, there is a thickened tissue ring that has a large number of nematocysts, the radial canals number from 4 to 6 to 8 and more than 8, though 8 is the most common amount found. The sensory clubs can be open or closed with the endodermal axis. The gonads are generally located at the radial canal or where the radial canal and the manubrium connect. The cnidome may have stenoteles. Trachymedusae reproduce sexually during the medusae stage lacking a polyp stage. Primarily found in the deep ocean, where they are recorded at depths of seventy to two thousand metres. Interactions with humans Interactions with humans are few as this spec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydrozoa
Hydrozoa (hydrozoans; ) are a taxonomic class of individually very small, predatory animals, some solitary and some colonial, most of which inhabit saline water. The colonies of the colonial species can be large, and in some cases the specialized individual animals cannot survive outside the colony. A few genera within this class live in freshwater habitats. Hydrozoans are related to jellyfish and corals and belong to the phylum Cnidaria. Some examples of hydrozoans are the freshwater jelly ('' Craspedacusta sowerbyi''), freshwater polyps (''Hydra''), '' Obelia'', Portuguese man o' war (''Physalia physalis''), chondrophores (Porpitidae), " air fern" (''Sertularia argentea''), and pink-hearted hydroids ('' Tubularia''). Anatomy Most hydrozoan species include both a polypoid and a medusoid stage in their lifecycles, although a number of them have only one or the other. For example, ''Hydra'' has no medusoid stage, while '' Liriope'' lacks the polypoid stage. Polyps The hydro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Petasidae
Petasidae is a family of cnidarians belonging to the order Trachymedusae Trachymedusae belong to the phylum Cnidaria and the class Hydrozoa, among the 30 genera are 5 families containing around 50 species in all, the family Rhopalonematidae has the greatest diversity. Description Trachymedusae are identifiable by the .... Genera: * '' Petasiella'' Uchida, 1947 * '' Petasus'' Haeckel, 1879 References Trachymedusae Cnidarian families {{hydrozoa-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ptychogastriidae
Ptychogastriidae is a family of cnidarians belonging to the order Trachymedusae Trachymedusae belong to the phylum Cnidaria and the class Hydrozoa, among the 30 genera are 5 families containing around 50 species in all, the family Rhopalonematidae has the greatest diversity. Description Trachymedusae are identifiable by the .... Genera: * '' Glaciambulata'' Galea, 2016 * '' Ptychogastria'' Allman, 1878 * '' Tesserogastria'' Beyer, 1958 References Trachymedusae Cnidarian families {{hydrozoa-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhopalonematidae
Rhopalonematidae is a family of hydrozoans. The family comprises 15 genera and 36 species. Genera *''Aglantha'' (4 species) *'' Aglaura'' (monotypic – ''Aglaura hemistoma'') *''Amphogona'' (3 species) *''Arctapodema'' (4 species) *''Benthocodon'' (2 species) *'' Colobonema'' (3 species) *'' Crossota'' (5 species) *''Pantachogon'' (3 species) *'' Persa'' (monotypic – ''Persa incolorata'') *'' Ransonia'' (monotypic – ''Ransonia krampi'') *''Rhopalonema'' (2 species) *''Sminthea'' (2 species) *''Tetrorchis'' (monotypic – ''Tetrorchis erythrogaster'') *''Vampyrocrossota'' (monotypic – ''Vampyrocrossota childressi'') *''Voragonema ''Voragonema'' is a genus of hydrozoans belonging to the family Rhopalonematidae. The genus comprises four species.Lindsay, Dhugal & Francesc Pagès, 2010. "''Voragonema tatsunoko'' (Trachymedusae: Rhopalonematidae) a new species of benthopelag ...'' (4 species) References * Schuchert, Peter (2005)The Hydrozoa Directory� Retrieved 4 Nove ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crossota
''Crossota'' is a genus of hydrozoans of the family Rhopalonematidae. The genus comprises five species. Unlike most hydromedusae, these do not have a sessile Sessility, or sessile, may refer to: * Sessility (motility), organisms which are not able to move about * Sessility (botany), flowers or leaves that grow directly from the stem or peduncle of a plant * Sessility (medicine), tumors and polyps that ... stage. Rather, they spend their entire lives in the water column as plankton. The genus ''Crossota'' is widespread throughout the oceans. Species *'' Crossota alba'' *'' Crossota brunnea'' *'' Crossota millsae'' *'' Crossota norvegica'' *'' Crossota rufobrunnea'' References World Register of Marine Species Rhopalonematidae Hydrozoan genera Bioluminescent cnidarians {{hydrozoa-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geryoniidae
The Geryoniidae are a family of hydrozoans in the order Trachymedusae. List of genera *''Geryonia ''Geryonia'' is a monotypic genus of hydrozoans in the family Geryoniidae. It is represented by the species ''Geryonia proboscidalis'' which occurs in the Mediterranean and subtropical seas. In the Mediterranean the species is more numerous and ...'' Péron & Lesueur, 1810 *'' Liriope'' Lesson, 1843 ;''Nomen dubium'' *''Heptarradiata'' Zamponi & Gezano, 1989 *''Octorradiata'' Zamponi & Gezano, 1989 *''Pentarradiata'' Zamponi & Gezano, 1989 References Cnidarian families Taxa named by Johann Friedrich von Eschscholtz {{hydrozoa-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Halicreatidae
Halicreatidae is a family Family (from la, familia) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its ... of hydrozoans. The family comprises 6 genera and 9 species. Taxonomy References Trachymedusae Cnidarian families {{hydrozoa-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cnidaria
Cnidaria () is a phylum under kingdom Animalia containing over 11,000 species of aquatic animals found both in Fresh water, freshwater and Marine habitats, marine environments, predominantly the latter. Their distinguishing feature is cnidocytes, specialized cells that they use mainly for capturing prey. Their bodies consist of mesoglea, a non-living jelly-like substance, sandwiched between two layers of epithelium that are mostly one cell (biology), cell thick. Cnidarians mostly have two basic body forms: swimming Medusa (biology), medusae and Sessility (motility), sessile polyp (zoology), polyps, both of which are Symmetry (biology)#Radial symmetry, radially symmetrical with mouths surrounded by tentacles that bear cnidocytes. Both forms have a single Body orifice, orifice and body cavity that are used for digestion and respiration (physiology), respiration. Many cnidarian species produce Colony (biology), colonies that are single organisms composed of medusa-like or polyp (z ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cnidocyte
A cnidocyte (also known as a cnidoblast or nematocyte) is an explosive Cell (biology), cell containing one large secretory organelle called a cnidocyst (also known as a cnida () or nematocyst) that can deliver a sting to other organisms. The presence of this cell defines the phylum Cnidaria (corals, sea anemones, Hydra (genus), hydrae, jellyfish, etc.). Cnidae are used to capture prey and as a defense against predators. A cnidocyte fires a structure that contains a toxin within the cnidocyst; this is responsible for the stings delivered by a cnidarian. Structure and function Each cnidocyte contains an organelle called a cnida, cnidocyst, nematocyst, ptychocyst or spirocyst. This organelle consists of a bulb-shaped capsule containing a coiled hollow tubule structure attached to it. An immature cnidocyte is referred to as a cnidoblast or nematoblast. The externally oriented side of the cell has a hair-like trigger called a cnidocil, which is a mechano- and chemo-receptor. When ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Liriope Tetraphylla
''Liriope'' is a genus of hydrozoan in the family Geryoniidae. It contains only one species, ''Liriope tetraphylla''. Description ''Liriope tetraphylla'' has marginal tentacles, a manubrium, and gonads that are all green or rose-red in colour. It has a nearly hemispherical umbrella which is normally 10 to 30 mm wide. The exumbrella has four interradial and four perradial nematocyst tracks that are short in length. It has a well-developed velum. Normally, there are four radial canals that are straight. The ring canal is broad, and each quadrant has 1 to 3 (and possibly more) centriipedal canals that are short and blind. A marginal nematocyst ring is present. It has thick jelly, particularly in the region towards the apex. The manubrium of ''Liriope tetraphylla'' are extend from a long, gastric pendicule. These manubrium are normally 1 to 3 times the height of the umbrella. There are four lips on the mouth that are either simple or slightly crenulated. The subumbrellar par ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sea Of Marmara
The Sea of Marmara,; grc, Προποντίς, Προποντίδα, Propontís, Propontída also known as the Marmara Sea, is an inland sea located entirely within the borders of Turkey. It connects the Black Sea to the Aegean Sea via the Bosporus and Dardanelles straits, separating the country's European and Asian sides. The Sea of Marmara is a small sea with an area of , and dimensions of . Its greatest depth is . Name The Sea of Marmara is named after the largest island to its south side which is called Marmara Island because it is rich in marble (Greek (''mármaron'') "marble)." In classical antiquity it was known as the Propontis, which is derived from the Greek words ''pro-'' (before) and ''pontos'' (sea) and reflects the fact that the Ancient Greeks used to sail through it to reach the Black Sea that they called Pontos. Mythology In Greek mythology, a storm on the Propontis brought the Argonauts back to an island they had left, precipitating a battle in whic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
