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Koonaspides
''Koonaspides'' is an extinct genus of fossil crustacean in the family Anaspidesidae, from Early Cretaceous (Aptian) Koonwarra Fossil Beds in eastern Victoria, Australia. The only known species within the genus is ''Koonaspides indistinctus''.P. A. Jell and P. M. Duncan. 1986. Invertebrates, mainly insects, from the freshwater, Lower Cretaceous, Koonwarra Fossil Bed (Korumburra Group), South Gippsland, Victoria. ''Memoirs of the Association of Australasian Palaeontologists'' 3:111-205 Along with the Triassic genus '' Anaspidites'', this is one of two known fossil members of this family. Discovery and etymology A single specimen of ''K. indistinctus'', NMV P102799 is known from the Koonwarra Fossil Beds. The genus name consists of Koon- from Koonwarra and -aspides from Greek ''aspis'', a shield. The species name ''indistinctus'' means obscure or dim. Description The only known specimen of ''K. indistinctus'' has a body length of , with indistinct antennae preserved as long ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anaspidesidae
Anaspidesidae is a family of freshwater crustacean that is endemic to Tasmania, Australia. The family contains 3 living genera. This group of crustaceans are considered living fossils. They are commonly and collectively known as the Tasmanian anaspid crustaceans. This family is originally called as Anaspididae. However, genus name ''Anaspis'' was preoccupied by the insect genus, ''Anaspis'' Geoffroy, 1762, and therefore, in 2017, the family was renamed to Anaspidesidae by Shane Ahyong and Miguel A. Alonso-Zarazaga. Anaspiesids have stalked eyes, long antennae and antennules, and a slender body with no carapace. The two species of ''Allanaspides'' and the single species of ''Paranaspides'' are all listed as vulnerable on the IUCN Red List. Taxonomy After Höpel ''et al.'' (2023) *''Allanaspides'' Swain, Wilson, Hickman & Ong, 1970 **'' Allanaspides hickmani'' Swain, Wilson & Ong, 1970 – commonly known as Hickman's pygmy mountain shrimp **'' Allanaspides helonomus'' Swain, W ... [...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] |
Early Cretaceous Arthropods
Early may refer to: Places in the United States * Early, Iowa, a city * Early, Texas, a city * Early Branch, a stream in Missouri * Early County, Georgia * Fort Early, Georgia, an early 19th century fort Music * Early B, stage name of Jamaican dancehall and reggae deejay Earlando Arrington Neil (1957–1994) * Early James, stage name of American singer-songwriter Fredrick Mullis Jr. (born 1993) * ''Early'' (Scritti Politti album), 2005 * ''Early'' (A Certain Ratio album), 2002 * Early Records, a record label Other uses * Early (name), a list of people and fictional characters with the given name or surname * Early effect, an effect in transistor physics * Early, a synonym for ''hotter'' in stellar classification See also * * The Earlies, a 21st century band * Earley (other) * Earlie Earlie is a masculine given name which may refer to: * Earlie Fires (born 1947), American jockey * Earlie Thomas (1945–2022), American National Football League player * Earlie End ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ostracod
Ostracods, or ostracodes, are a Class (biology), class of the crustacean, Crustacea (class Ostracoda), sometimes known as seed shrimp. Some 33,000 species (only 13,000 of which are extant taxon, extant) have been identified,Brandão, S.N.; Antonietto, L.S; Nery, D.G.; Santos, S.G.; Karanovic, I. (2023). World Ostracoda Database. Accessed at https://www.marinespecies.org/ostracoda on 2023-09-12. grouped into 7 valid orders. They are small crustaceans, typically around in size, but varying from , the latter in the case of the marine ''Gigantocypris.'' The largest known freshwater species is ''Megalocypris princeps'', which reach 8 mm in length. In most cases, their bodies are flattened from side to side and protected by a bivalve-like valve or "shell" made of chitin, and often calcium carbonate. The family Entocytheridae and many planktonic forms do not have calcium carbonate. The hinge of the two valves is in the upper (dorsal) region of the body. Ostracods are grouped toget ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anostracan
Anostraca is one of the four orders of crustaceans in the class Branchiopoda; its members are referred to as fairy shrimp. They live in vernal pools and hypersaline lakes across the world, and they have even been found in deserts, ice-covered mountain lakes, and Antarctic ice. They are usually long (exceptionally up to ). Most species have 20 body segments, bearing 11 pairs of leaf-like ''phyllopodia'' (swimming legs), and the body lacks a carapace. They swim "upside-down" and feed by filtering organic particles from the water or by scraping algae from surfaces, with the exception of ''Branchinecta gigas,'' or "giant fairy shrimp", which is itself a predator of other species of anostracans. They are an important food for many birds and fish, and some are cultured and harvested for use as fish food. There are 300 species spread across 8 families. Description The body of a fairy shrimp is elongated and divided into segments. The whole animal is typically long, but one species, '' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lioestheria
''Lioestheria'' is an extinct genus of clam shrimp that thrived from the Carboniferous to the Cretaceous (360.7 to 99.7 Mya). They fed on detritus, being very small slow moving, nekton Nekton or necton (from the ) is any aquatic organism that can actively and persistently propel itself through a water column (i.e. swimming) without touching the bottom. Nektons generally have powerful tails and appendages (e.g. fins, pleopods, ...ic organisms that filter fed as they floated. They have been found in both marine and freshwater environments. First identified in 1912, they have been found in Germany, Hungary, Colorado,Lucas, S.G. and Kirkland, J.I., 1998. Preliminary report on conchostraca form the Upper Jurassic Morrison Formation, western United states. ''Modern Geology'', ''22'', p.415-422. New Mexico, Montana, Texas, Utah and China. There are two species: *'' Lioestheria monticula *'' Lioestheria carinacurvata'' References Diplostraca Branchiopoda genera {{branc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cyzicus (crustacean)
''Cyzicus'' is a genus of clam shrimp Clam shrimp are a group of bivalved branchiopod crustaceans that resemble the unrelated bivalved molluscs. They are extant and also known from the fossil record, from at least the Devonian period and perhaps before. They were originally classif ...s in the family Cyzicidae. Identified by Jean Victoire Audouin in 1837, the genus was reidentified as ''Caenestheriella'' by Eugen von Daday in 1910. There are seven species in the genus: *'' Cyzicus belfragei'' (Packard, 1871) – Belfrage clam shrimp *'' Cyzicus californicus'' (Packard, 1883) – California clam shrimp *'' Cyzicus elongatus'' (Mattox, 1957 – elongate clam shrimp *'' Cyzicus gynecia'' (Mattox, 1949) – Mattox clam shrimp *'' Cyzicus mexicanus'' (Claus, 1860) – Mexican clam shrimp *'' Cyzicus morsei'' (Packard, 1883) – Morse clam shrimp *'' Cyzicus setosa'' (Pearse, 1912) – setose clam shrimp References Branchiopoda genera Spinicaudata {{Bran ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Conchostracans
Clam shrimp are a group of bivalved branchiopod crustaceans that resemble the unrelated bivalved molluscs. They are extant and also known from the fossil record, from at least the Devonian period and perhaps before. They were originally classified in the former order Conchostraca, which later proved to be paraphyletic, because water fleas are nested within clam shrimps. Clam shrimp are now divided into three orders, Cyclestherida, Laevicaudata, and Spinicaudata, in addition to the fossil family Leaiidae. Characteristics Both valves of the shell are held together by a strong closing muscle. The animals react to danger by contracting the muscle, so that the valves close tightly and the crustacean, as if dead, lies motionlessly at the bottom of the pool. In most species the head is dorsoventrally compressed. The sessile compound eyes are close together and located on the forehead; in the genus ''Cyclestheria'' they are truly fused. In front of them is a simple naupliar eye. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Victalimulus
''Victalimulus mcqueeni'' is an extinct horseshoe crab, from Early Cretaceous (Aptian) Koonwarra Fossil Beds in eastern Victoria, Australia. The holotype and only known specimen was discovered by James McQueen who was encouraged by Leon Costermans to take it to the Museum of Victoria. Unlike modern species of horseshoe crab, it was likely native to freshwater as the Koonwarra Fossil Beds was, during the Aptian The Aptian is an age (geology), age in the geologic timescale or a stage (stratigraphy), stage in the stratigraphic column. It is a subdivision of the Early Cretaceous, Early or Lower Cretaceous epoch (geology), Epoch or series (stratigraphy), S ... epoch, a freshwater lake. References Xiphosura Early Cretaceous arthropods Cretaceous arthropods of Australia {{Paleo-arthropod-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Xiphosuran
Xiphosura (; , in reference to its sword-like telson) is an order of arthropods related to arachnids. They are more commonly known as horseshoe crabs (a name applied more specifically to the only extant family, Limulidae). They first appeared in the Hirnantian (Late Ordovician). Currently, there are only four living species. Xiphosura contains one suborder, Xiphosurida, and several stem-genera. The group has hardly changed in appearance in hundreds of millions of years; the modern horseshoe crabs look almost identical to prehistoric genera and are considered to be living fossils. The most notable difference between ancient and modern forms is that the abdominal segments in present species are fused into a single unit in adults. Xiphosura were historically placed in the class Merostomata, although this term was intended to encompass also the eurypterids, whence it denoted what is now thought to be an unnatural (paraphyletic) group (although this is a grouping recovered in some rece ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tarwinia
''Tarwinia'' is an extinct genus of stem-group flea known from a single species, ''T. australis'', from the Early Cretaceous (Aptian) Koonwarra Fossil Bed of Victoria Victoria most commonly refers to: * Queen Victoria (1819–1901), Queen of the United Kingdom and Empress of India * Victoria (state), a state of Australia * Victoria, British Columbia, Canada, a provincial capital * Victoria, Seychelles, the capi ..., Australia, it is the only member of the family Tarwiniidae, and the only stem-group flea known from the Southern Hemisphere. References {{Taxonbar, from1=Q21315090, from2=Q21334053, from3=Q35082361 Prehistoric invertebrates of Australia Fleas Monotypic prehistoric insect genera Early Cretaceous insects ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
