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Pycnogonids
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 Pantopoda ( ‘all feet’), alongside a few fossil species which could trace back to the early or mid Paleozoic. They are cosmopolitan distribution, cosmopolitan, found in oceans around the world. The over 1,300 known species have leg spans ranging from to over . Most are toward the smaller end of this range in relatively shallow depths; however, they can grow to be quite large in Antarctic and deep-sea gigantism, deep waters. Despite their name and brief resemblance, "sea spiders" are not spiders, nor even arachnids. While some literature around the 2000s suggests they may be a sister group to all other living arthropods, their traditional classification as a member of chelicerates alongside Xiphosura, horseshoe crabs and arachnids has r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Callipallene Brevirostris (YPM IZ 077244) 003
''Callipallene brevirostris'' is a species of sea spider in the family Callipallenidae. It is found in Europe. Subspecies These two subspecies belong to the species ''Callipallene brevirostris'': * ''Callipallene brevirostris brevirostris'' (Johnston, 1837) * ''Callipallene brevirostris producta'' (G. O. Sars, 1888) References Pycnogonids Articles created by Qbugbot Animals described in 1837 {{Chelicerata-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Austrodecidae
Austrodecidae is a family of sea spiders. Austrodecids tend to be small measuring only 1–2 mm, characterized by an annulated proboscis with vertical slit-like mouth opening. It is the most basal family of the order Pantopoda, representing a lineage (Stiripasterida) sister A sister is a woman or a girl who shares parents or a parent with another individual; a female sibling. The male counterpart is a brother. Although the term typically refers to a familial relationship, it is sometimes used endearingly to ref ... to all other pantopod families (Eupantopodida). References * PycnoBaseWorld list of Pycnogonida External links * Pycnogonids Chelicerate families {{Chelicerata-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Colossendeidae
Colossendeidae is a family of sea spiders (class Pycnogonida). This family includes more than 100 species distributed among six genera. These sea spiders inhabit the deep sea mostly but are also found in shallower waters, especially in Antarctic and Arctic waters. Description Most colossendeids can grow to giant sizes as adults, far larger than any other sea spiders. The largest sea spider, '' Colossendeis colossea'', can reach a leg span of 70 cm, whereas the subfamily Hedgpethiinae includes tiny species with leg span of less than 1 cm. Like most sea spiders, colossendeids usually have four pairs of legs, except for three species, '' Decolopoda australis'', '' D. qasimi'', and '' Pentacolossendeis reticulata'', with five leg pairs, and one species, '' Dodecolopoda mawsoni'', with six leg pairs. Colossendeids typically have no chelifores, except in the extra-legged species which have robust pincers and 2-segmented scapes. The palps and ovigers are present in both males and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pycnogonidae
Pycnogonidae is a family of sea spiders. Characteristics Sea spiders of the family Pycnogonidae are recognisable by their stubby legs, rough-surfaced exoskeleton and the significant reduction of cephalic appendages. Chelifores (feeding pincers) and palps (sensory limbs) as seen in most other sea spiders are completely absent after postlarval metamorphosis, instead they using only their proboscis to suck juices from their cnidarian prey. Ovigers (cleaning and offspring-carrying limbs) are only retained in adult males, bring absent in all females of this family and exceptionally lost in both sexes of the subgenus ''Nulloviger''. Their legs are noticeably stout and short, in contrast to other sea spiders with a slender appearance. Like most sea spiders, they usually have four pairs of legs, except for genus '' Pentapycnon'' with five pairs. Genera The World Register of Marine Species lists the following genera: *'' Pentapycnon'' Bouvier, 1910 *''Pycnogonum ''Pycnogonum'' is a g ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ammotheidae
Ammotheidae is the most diversified group of the class Pycnogonida Sea spiders are marine arthropods of the 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 Pantopoda ( ‘all feet’), alongs ..., with 297 species described in more than 20 genera, of which only '' Nymphopsis'' and '' Sericosura'' were found to be monophyletic. Despite its internal taxonomic uncertainty, studies on 18S rRNA supports its monophyly, and the subdivision on Achelinae and Ammotheinae subfamilies. Genera The family Ammotheidae comprises the following subfamilies: * '' Achelia'' Hodge, 1864 * '' Acheliana'' Arnaud, 1971 * '' Ammothea'' Leach, 1814 * '' Ammothella'' Verrill, 1900 * '' Austroraptus'' Hodgson, 1907 * '' Biammothea'' Pushkin, 1993 * '' Cilunculus'' Loman, 1908 * '' Dromedopycnon'' Child, 1982 * '' Elassorhis'' Child, 1982 * '' Hedgpethius'' Child, 1974 * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nymphonidae
Nymphonidae is a family of 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 ...s which has representatives in all the oceans. This family contains some 250 species, most of which are found in the genus '' Nymphon''. Nymphonid bodies are between 1 and 15 mm long, the extent between the points of the legs reaching 150 mm. Most species are predators of hydroids. Like most sea spiders, species in this family have four pairs of legs, except for '' Pentanymphon antarcticum'', which has five pairs, and '' Sexanymphon mirabilis'', which has six pairs. Taxonomy Seven genera are currently recognized:Bamber, R.N., El Nagar, A. & Staples, D. (Eds) (2014). Pycnobase: World Pycnogonida Database. Accessed at http://www.marinespecies.org/pycnobase on 2014-10-30 * '' Boreonymph ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Palaeoisopus
''Palaeoisopus'' is a genus of fossil pycnogonid (sea spider). The only known species is ''Palaeoisopus problematicus'' from the Lower Devonian Hunsrück Slate of Germany. It is characterized by several features unusual for a pycnogonid, such as swimming legs of different sizes and a long, segmented abdomen. Discovery ''Palaeoisopus'' is the most common pycnogonid of Hunsrück Slate, with over 80 fossil specimens had been discovered as of 2024. When this arthropod was first described by Broili 1928, it was thought to be an isopod crustacean, hence the name ''Palaeoisopus''. A few years later, it was re-identified as a pycnogonid by the same author. Even so, the anterior and posterior axis was reversed, with the overlapped chelifores and long abdomen being misinterpreted as a round abdomen and an elongated cephalon (head), respectively. This was corrected by Lehmann 1959, which using X-ray to identify cephalic structures such as ovigers and ocular tubercles between the "abdomen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Deep-sea Gigantism
In zoology, deep-sea gigantism or abyssal gigantism is the tendency for species of deep-sea dwelling animals to be larger than their shallower-water relatives across a large taxonomic range. Proposed explanations for this type of gigantism include necessary adaptation to colder temperature, food scarcity, reduced predation pressure and increased dissolved oxygen concentrations in the deep sea. The harsh conditions and inhospitality of the underwater environment in general, as well as the inaccessibility of the abyssal zone for most human-made underwater vehicles, have hindered the study of this topic. Taxonomic range In marine crustaceans, the trend of increasing size with depth has been observed in mysids, euphausiids, decapods, isopods, ostracods and amphipods. Non-arthropods in which deep-sea gigantism has been observed are cephalopods, cnidarians, and eels from the order Anguilliformes. Notable organisms that exhibit deep-sea gigantism include the big red jellyfish, ' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cosmopolitan Distribution
In biogeography, a cosmopolitan distribution is the range of a taxon that extends across most or all of the surface of the Earth, in appropriate habitats; most cosmopolitan species are known to be highly adaptable to a range of climatic and environmental conditions, though this is not always so. Killer whales ( orcas) are among the most well-known cosmopolitan species on the planet, as they maintain several different resident and transient (migratory) populations in every major oceanic body on Earth, from the Arctic Circle to Antarctica and every coastal and open-water region in-between. Such a taxon (usually a species) is said to have a ''cosmopolitan'' distribution, or exhibit cosmopolitanism, as a species; another example, the rock dove (commonly referred to as a ' pigeon'), in addition to having been bred domestically for centuries, now occurs in most urban areas around the world. The extreme opposite of a cosmopolitan species is an endemic (native) species, or one foun ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Department Of The Environment And Energy
The Department of the Environment and Energy (DEE) was an Government of Australia, Australian government department in existence between 2016 and 2020. The department was responsible for matters including environment protection and conservation of biodiversity as well as energy policy. It was established in July 2016 by the Turnbull government after the 2016 Australian federal election, 2016 federal election. Following the appointment of Scott Morrison as Prime Minister, Josh Frydenberg was elevated to Treasurer of Australia, whereby Frydenberg's previous ministerial positions were separated, with Melissa Price (politician), Melissa Price as Minister of the Environment (Australia), Minister of the Environment and Angus Taylor (politician), Angus Taylor as Minister for Energy. Price was reshuffled from her position in 2019, and was replaced by Sussan Ley. By an administrative order issued on 5 December 2019 and effective from 1 February 2020, the environment functions of th ... [...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] |
Chelicerates
The subphylum Chelicerata (from Neo-Latin, , ) constitutes one of the major subdivisions of the phylum Arthropoda. Chelicerates include the sea spiders, horseshoe crabs, and arachnids (including harvestmen, scorpions, spiders, solifuges, ticks, and mites, among many others), as well as a number of extinct lineages, such as the eurypterids (sea scorpions) and chasmataspidids. Chelicerata split from Mandibulata by the mid-Cambrian, as evidenced by stem-group chelicerates like Habeliida and '' Mollisonia'' present by this time. The surviving marine species include the four species of xiphosurans (horseshoe crabs), and possibly the 1,300 species of pycnogonids (sea spiders), if the latter are indeed chelicerates. On the other hand, there are over 77,000 well-identified species of air-breathing chelicerates, and there may be about 500,000 unidentified species. Like all arthropods, chelicerates have segmented bodies with jointed limbs, all covered in a cutic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
