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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] |
