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Remipedia
Remipedia is a class of blind crustaceans, closely related to hexapods, found in coastal aquifers which contain saline groundwater, with populations identified in almost every ocean basin so far explored, including in Australia, the Caribbean Sea, and the Atlantic Ocean. The first described remipede was the fossil '' Tesnusocaris goldichi'' ( Lower Pennsylvanian). Since 1979, at least seventeen living species have been identified in subtropical regions around the world. Description Remipedes are long and comprise a head and an elongate trunk of up to thirty-two similar body segments. Pigmentation and eyes are absent. Biramous swimming appendages are laterally present on each segment. The animals swim on their backs and are generally slow-moving. They are the only known venomous crustaceans, and have fangs connected to secretory glands, which inject a combination of digestive enzymes and venom into their prey, but they also feed through filter feeding. Being hermaphrodites, the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pancrustacea
Pancrustacea is the clade that comprises all crustaceans and all hexapods (insects and relatives). This grouping is contrary to the Atelocerata hypothesis, in which Hexapoda and Myriapoda are sister taxa, and Crustacea are only more distantly related. As of 2010, the Pancrustacea taxon was considered well accepted, with most studies recovering Hexapoda within Crustacea. The clade has also been called Tetraconata, referring to having a four-part cone in the ommatidium. The term "Tetraconata" is preferred by some scientists in order to avoid confusion with the use of "pan-" to indicate a clade that includes a crown group and all of its stem group representatives. Molecular studies A monophyletic Pancrustacea has been supported by several molecular studies, in most of which the subphylum Crustacea is paraphyletic with regard to hexapods (that is, that hexapods, including insects, are derived from crustacean ancestors). This means that within Pancrustacea, only some members are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crustacean
Crustaceans (from Latin meaning: "those with shells" or "crusted ones") are invertebrate animals that constitute one group of arthropods that are traditionally a part of the subphylum Crustacea (), a large, diverse group of mainly aquatic arthropods including decapods (shrimps, prawns, crabs, lobsters and crayfish), seed shrimp, branchiopods, fish lice, krill, remipedes, isopods, barnacles, copepods, opossum shrimps, amphipods and mantis shrimp. The crustacean group can be treated as a subphylum under the clade Mandibulata. It is now well accepted that the hexapods (insects and entognathans) emerged deep in the Crustacean group, with the completed pan-group referred to as Pancrustacea. The three classes Cephalocarida, Branchiopoda and Remipedia are more closely related to the hexapods than they are to any of the other crustaceans ( oligostracans and multicrustaceans). The 67,000 described species range in size from '' Stygotantulus stocki'' at , to the Japanese ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jill Yager
Jill Yager is an American zoologist and cave diver. Yager's research is centered on the conservation of inland caves. She discovered a venomous crustacean species, and she also named its class. Yager was named Cave Scientist of the Year in 2000 and was inducted into the Women Divers Hall of Fame in 2000. Education Yager received her bachelor's degree from Colorado State University, her Master's of Science degree from the Florida Institute of Technology, and her Ph.D. from Old Dominion University. Career After reading ''Kon Tiki'' and ''Lady with a Spear'', Yager became interested in exploring underwater. Jacques Cousteau, who raised public awareness about the ocean, had an impact on her. She was inspired by Jane Goodall, whom she regards as "a true hero". Yager's research is centered on the conservation of inland caves, emphasizing that activities occurring above the caves, such as deforestation and pollution, can influence the caves themselves. She started her research in the mid ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tesnusocaris Goldichi
''Tesnusocaris goldichi'' is an extinct species of remipedian crustacean that lived in the Pennsylvanian period, one of the two representatives of the extinct remipedian order Enantiopoda. Its fossil is from the Lower Pennsylvanian (Paleozoic, Carboniferous) Tesnus formation, Texas Texas ( , ; or ) is the most populous U.S. state, state in the South Central United States, South Central region of the United States. It borders Louisiana to the east, Arkansas to the northeast, Oklahoma to the north, New Mexico to the we .... The other known enantiopod remipedian is '' Cryptocaris hootchi'' of the Mazon Creek fauna. References Remipedia Carboniferous crustaceans Monotypic crustacean genera Carboniferous animals of North America {{paleo-crustacean-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Godzilliidae
Godzilliidae is a family of remipede Remipedia is a class of blind crustaceans, closely related to hexapods, found in coastal aquifers which contain saline groundwater, with populations identified in almost every ocean basin so far explored, including in Australia, the Caribbean Se ...s in the order Nectiopoda. There are at least two genera and four described species in Godzilliidae. Genera These two genera belong to the family Godzilliidae: * '' Godzilliognomus'' Yager, 1989 * '' Godzillius'' Schram, Yager & Emerson, 1986 References Further reading * * Remipedia Articles created by Qbugbot Crustacean families {{crustacean-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Speleonectidae
Speleonectidae is a family of remipede Remipedia is a class of blind crustaceans, closely related to hexapods, found in coastal aquifers which contain saline groundwater, with populations identified in almost every ocean basin so far explored, including in Australia, the Caribbean Se ...s in the order Nectiopoda. There are at least two genera and about seven described species in Speleonectidae. Genera These two genera and seven species belong to the family Speleonectidae: * '' Lasionectes'' Yager & Schram, 1986 ** '' Lasionectes entrichoma'' Yager & Schram, 1986 * '' Speleonectes'' Yager, 1981 ** '' Speleonectes epilimnius'' Yager & Carpenter, 1999 ** '' Speleonectes gironensis'' Yager, 1994 ** '' Speleonectes kakuki'' Daenekas, Iliffe, Yager & Koenemann, 2009 ** '' Speleonectes lucayensis'' Yager, 1981 ** '' Speleonectes minnsi'' Koenemann, Iliffe & van der Ham, 2003 ** '' Speleonectes tanumekes'' Koenemann, Iliffe & van der Ham, 2003 Several former ''Speleonectes'' species ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lucayan Caverns
Lucayan National Park is a national park in Grand Bahama, the Bahamas. The park was established in 1982 and has a land area of , and in total. The park contains an underwater cave system with of charted tunnels. Flora and fauna Prior to the creation of the park, the area was the site of the discovery of the Remipedia class of crustaceans, in 1979. The park is also an Important Bird Area An Important Bird and Biodiversity Area (IBA) is an area identified using an internationally agreed set of criteria as being globally important for the conservation of bird populations. IBA was developed and sites are identified by BirdLife Int ..., providing habitat for the thick-billed vireo, Bahama swallow and the olive-capped warbler, among others. See also * Cave diving regions of the world: Bahamas References National parks of the Bahamas Grand Bahama {{Bahamas-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hermaphrodite
A hermaphrodite () is a sexually reproducing organism that produces both male and female gametes. Animal species in which individuals are either male or female are gonochoric, which is the opposite of hermaphroditic. The individuals of many taxonomic groups of animals, primarily invertebrates, are hermaphrodites, capable of producing viable gametes of both sexes. In the great majority of tunicates, mollusks, and earthworms, hermaphroditism is a normal condition, enabling a form of sexual reproduction in which either partner can act as the female or male. Hermaphroditism is also found in some fish species, but is rare in other vertebrate groups. Most hermaphroditic species exhibit some degree of self-fertilization. The distribution of self-fertilization rates among animals is similar to that of plants, suggesting that similar pressures are operating to direct the evolution of selfing in animals and plants. A rough estimate of the number of hermaphroditic animal species ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tagma (biology)
In biology, a tagma (Greek: τάγμα, : tagmata – τάγματα - body of soldiers; battalion) is a specialized grouping of multiple segmentation (biology), segments or Metamerism (biology), metameres into a coherently functional Morphology (biology), morphological unit. Familiar examples are the head, the Thorax (arthropod anatomy), thorax, and the Abdomen#Arthropoda, abdomen of insects. The segments within a tagma may be either fused (such as in the head of an insect) or so jointed as to be independently moveable (such as in the abdomen of most insects). Usually the term is taken to refer to tagmata in the morphology of members of the phylum Arthropoda, but it applies equally validly in other phyla, such as the Chordata. In a given taxon the names assigned to particular tagmata are in some sense informal and arbitrary; for example, not all the tagmata of species within a given subphylum of the Arthropoda are Homology (biology), homologous to those of species in other subph ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Proceedings Of The National Academy Of Sciences
''Proceedings of the National Academy of Sciences of the United States of America'' (often abbreviated ''PNAS'' or ''PNAS USA'') is a peer-reviewed multidisciplinary scientific journal. It is the official journal of the National Academy of Sciences, published since 1915, and publishes original research, scientific reviews, commentaries, and letters. According to ''Journal Citation Reports'', the journal has a 2022 impact factor of 9.4. ''PNAS'' is the second most cited scientific journal, with more than 1.9 million cumulative citations from 2008 to 2018. In the past, ''PNAS'' has been described variously as "prestigious", "sedate", "renowned" and "high impact". ''PNAS'' is a delayed open-access journal, with an embargo period of six months that can be bypassed for an author fee ( hybrid open access). Since September 2017, open access articles are published under a Creative Commons license. Since January 2019, ''PNAS'' has been online-only, although print issues are available ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
