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Colossendeis Bouvetensis
''Colossendeis'' is a genus of sea spider (class (biology), class Pycnogonida) belonging to the Family (biology), family Colossendeidae. These sea spiders are typically found in the deep sea. This genus includes the largest pycnogonids, with leg spans frequently ranging from 40 to 50 cm (16-20 in). The largest sea spider, ''Colossendeis colossea'', can reach a leg span of 70 cm (28 in). This genus also includes some Bioluminescence, bioluminescent sea spiders. Description Sea spiders in this genus feature an unsegmented trunk, a low ocular tubercle, and a well-developed abdomen. Chelifores are absent in adults. The palps and ovigers touch at their bases, and the strigilis is tightly curved with a strong terminal claw. Species in this genus have only four pairs of legs. The ventral surface of the second most proximal article (second coxa) of some or all of these legs features tiny genital pores. Feeding Sea spiders in this genus feed on Cnidaria, cnidarians, Sponge, sponges, B ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Decolopoda
''Decolopoda'' is a genus of sea spider (class Pycnogonida) in the family Colossendeidae. This genus includes two valid species, '' D. australis'' and '' D. qasimi''. As the name of this genus implies, these two species are among the seven species of sea spider with five pairs of legs in adults instead of the usual four leg pairs. The species ''D. australis'' is notable as the first polymerous (i.e., extra-legged) sea spider to be discovered. Discovery and taxonomy The species ''D. australis'' was first described by the American naturalist James Eights in 1834. He based the original description of this species on specimens found in the sea along the South Shetland Islands in the Antarctic region. Naturalists mostly ignored his discovery, dismissing the description by Eights as erroneous or based on a monstrosity, until the discovery of more ten-legged species several decades later. In 1905, the French zoologist Eugène-Louis Bouvier described one of these sea spiders as a new ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Colossendeis Angusta
''Colossendeis'' is a genus of sea spider (class Pycnogonida) belonging to the family Colossendeidae. These sea spiders are typically found in the deep sea. This genus includes the largest pycnogonids, with leg spans frequently ranging from 40 to 50 cm (16-20 in). The largest sea spider, ''Colossendeis colossea'', can reach a leg span of 70 cm (28 in). This genus also includes some bioluminescent sea spiders. Description Sea spiders in this genus feature an unsegmented trunk, a low ocular tubercle, and a well-developed abdomen. Chelifores are absent in adults. The palps and ovigers touch at their bases, and the strigilis is tightly curved with a strong terminal claw. Species in this genus have only four pairs of legs. The ventral surface of the second most proximal article (second coxa) of some or all of these legs features tiny genital pores. Feeding Sea spiders in this genus feed on cnidarians, sponges, bryozoans, small mollusks, and small polychaetes. Phylogeny Although ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Colossendeis Acuta
''Colossendeis acuta'' is a sea spider Sea spiders are marine arthropods of the class (biology), class Pycnogonida, hence they are also called pycnogonids (; named after ''Pycnogonum'', the type genus; with the suffix '). The class includes the only now-living order (biology), order P ... that occurs in deep-sea habitats in the Antarctic Pacific. The species shows sexual dimorphism and the eggs are brooded by the male. References Pycnogonids Animals described in 1993 {{Chelicerata-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Colossendeis Robusta
''Colossendeis'' is a genus of sea spider (class Pycnogonida) belonging to the family Colossendeidae. These sea spiders are typically found in the deep sea. This genus includes the largest pycnogonids, with leg spans frequently ranging from 40 to 50 cm (16-20 in). The largest sea spider, ''Colossendeis colossea'', can reach a leg span of 70 cm (28 in). This genus also includes some bioluminescent sea spiders. Description Sea spiders in this genus feature an unsegmented trunk, a low ocular tubercle, and a well-developed abdomen. Chelifores are absent in adults. The palps and ovigers touch at their bases, and the strigilis is tightly curved with a strong terminal claw. Species in this genus have only four pairs of legs. The ventral surface of the second most proximal article (second coxa) of some or all of these legs features tiny genital pores. Feeding Sea spiders in this genus feed on cnidarians, sponges, bryozoans, small mollusks, and small polychaetes. Phylogeny Although ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Colossendeis Megalonyx
''Colossendeis megalonyx'' is a species of pycnogonids, also known as sea spiders, in the family Colossendeidae. The species was first described by Dutch zoologist Dr. Paulus Peronius Cato Hoek after his voyage on '' HMS Challenger'' from 1873-1876. Etymology The name stems from the Latin word ''Colossus'', meaning huge, and the derived Greek name, endeis, meaning 'in the earth'. ''Megalonyx'' is a Greek word that translates to great claw. Taxonomy ''Colossendeis megalonyx'' is a member of the genus ''Colossendeis'' and belongs to the Colossendeidae family. Colossendeidae exhibit apomorphies such as cephalization through the anterior migration of trunk ganglia and loss of chelifores. Further speciation of ''C. Megalonyx'' has been proposed due to its high morphological variability and wide distribution. Description ''Colossendeis megalonyx'' is characterized by its long proboscis, reaching up to about twice its trunk size as an adult. Although ''C. megalonyx'' belongs to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Colossendeis Glacialis
''Colossendeis'' is a genus of sea spider (class Pycnogonida) belonging to the family Colossendeidae. These sea spiders are typically found in the deep sea. This genus includes the largest pycnogonids, with leg spans frequently ranging from 40 to 50 cm (16-20 in). The largest sea spider, ''Colossendeis colossea'', can reach a leg span of 70 cm (28 in). This genus also includes some bioluminescent sea spiders. Description Sea spiders in this genus feature an unsegmented trunk, a low ocular tubercle, and a well-developed abdomen. Chelifores are absent in adults. The palps and ovigers touch at their bases, and the strigilis is tightly curved with a strong terminal claw. Species in this genus have only four pairs of legs. The ventral surface of the second most proximal article (second coxa) of some or all of these legs features tiny genital pores. Feeding Sea spiders in this genus feed on cnidarians, sponges, bryozoans, small mollusks, and small polychaetes. Phylogeny Although ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Antarctic
The Antarctic (, ; commonly ) is the polar regions of Earth, polar region of Earth that surrounds the South Pole, lying within the Antarctic Circle. It is antipodes, diametrically opposite of the Arctic region around the North Pole. The Antarctic comprises the continent of Antarctica, the Kerguelen Plateau, and other list of Antarctic and Subantarctic islands, island territories located on the Antarctic Plate or south of the Antarctic Convergence. The Antarctic region includes the ice shelf, ice shelves, waters, and all the island territories in the Southern Ocean situated south of the Antarctic Convergence, a zone approximately wide and varying in latitude seasonally. The region covers some 20 percent of the Southern Hemisphere, of which 5.5 percent (14 million km2) is the surface area of the Antarctica continent itself. All of the land and ice shelf, ice shelves south of 60th parallel south, 60°S latitude are administered under the Antarctic Treaty System. Biogeograph ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Clade
In biology, a clade (), also known as a Monophyly, monophyletic group or natural group, is a group of organisms that is composed of a common ancestor and all of its descendants. Clades are the fundamental unit of cladistics, a modern approach to taxonomy adopted by most biological fields. The common ancestor may be an individual, a population, or a species (extinct or Extant taxon, extant). Clades are nested, one in another, as each branch in turn splits into smaller branches. These splits reflect evolutionary history as populations diverged and evolved independently. Clades are termed ''monophyletic'' (Greek: "one clan") groups. Over the last few decades, the cladistic approach has revolutionized biological classification and revealed surprising evolutionary relationships among organisms. Increasingly, taxonomists try to avoid naming Taxon, taxa that are not clades; that is, taxa that are not Monophyly, monophyletic. Some of the relationships between organisms that the molecul ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Monophyly
In biological cladistics for the classification of organisms, monophyly is the condition of a taxonomic grouping being a clade – that is, a grouping of organisms which meets these criteria: # the grouping contains its own most recent common ancestor (or more precisely an ancestral population), i.e. excludes non-descendants of that common ancestor # the grouping contains all the descendants of that common ancestor, without exception Monophyly is contrasted with paraphyly and polyphyly as shown in the second diagram. A ''paraphyletic'' grouping meets 1. but not 2., thus consisting of the descendants of a common ancestor, excepting one or more monophyletic subgroups. A ''polyphyletic'' grouping meets neither criterion, and instead serves to characterize convergent relationships of biological features rather than genetic relationships – for example, night-active primates, fruit trees, or aquatic insects. As such, these characteristic features of a polyphyletic grouping are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
