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Pterygotidae
Pterygotidae (the name deriving from the type genus ''Pterygotus'', meaning "winged one") is a family of eurypterids, an extinct group of aquatic arthropods. They were members of the superfamily Pterygotioidea. Pterygotids were the largest known arthropods to have ever lived with some members of the family, such as ''Jaekelopterus'' and ''Acutiramus'', exceeding 2 metres (6.6 ft) in length. Their fossilized remains have been recovered in deposits ranging in age from 428 to 372 million years old (Late Silurian to Late Devonian). One of the most successful groups of eurypterids, the pterygotids were the only eurypterid family to achieve a truly cosmopolitan distribution, worldwide distribution. Several evolutionary innovations made the pterygotids unique among the eurypterids, with large and flattened telsons (the posteriormost division of the body) likely used as rudders to provide additional agility and enlarged chelicerae (frontal appendages) with claws. These claws were ro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pterygotioidea
Pterygotioidea (the name deriving from the type genus ''Pterygotus'', meaning "winged one") is a superfamily (taxonomy), superfamily of eurypterids, an extinct group of aquatic arthropods. Pterygotioids were the most Derived trait, derived members of the infraorder Diploperculata and the sister taxon, sister group of the Adelophthalmoidea, adelophthalmoid eurypterids. The group includes the basal (phylogenetics), basal and small Hughmilleriidae, hughmilleriids, the larger and specialized Slimonidae, slimonids and the famous Pterygotidae, pterygotids which were equipped with robust and powerful Chelicerae, cheliceral claws. Though the more primitive hughmilleriids were small, ''Hughmilleria, Hughmilleria wangi'' being the smallest of all pterygotioids at just in length, later members of the group, particularly in the Pterygotidae, would become the largest known arthropods to ever exist with several genera surpassing in length. Among all currently recognized eurypterid clades, t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pterygotus
''Pterygotus'' is an extinct genus of giant predatory eurypterid, a group of extinct aquatic arthropods. Fossils of ''Pterygotus'' have been discovered in deposits ranging in age from Middle Silurian to Late Devonian, and have been referred to several different species. Fossils have been recovered from four continents; Australia (continent), Australia, Europe, North America and South America, which indicates that ''Pterygotus'' might have had a nearly Cosmopolitan distribution, cosmopolitan (worldwide) distribution. The type species, ''P. anglicus'', was described by Swiss naturalist Louis Agassiz in 1839, who gave it the name ''Pterygotus'', meaning "winged one". Agassiz mistakenly believed the remains were of a giant fish; he would only realize the mistake five years later in 1844. ''Pterygotus'' was among the largest eurypterids. Isolated fossil remains of a large Chelicerae, chelicera (frontal appendage) suggests that the largest known species, ''P. grandidentatus'', reached ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acutiramus
''Acutiramus'' is a genus of giant predatory eurypterid, an extinct group of aquatic arthropods. Fossils of ''Acutiramus'' have been discovered in deposits of Late Silurian to Early Devonian age. Eight species have been described, five from North America (including ''A. cummingsi'', the type species) and two from the Czech Republic (with one of them potentially found in Australia as well). The generic name derives from Latin ''acuto'' ("acute" or "sharp") and Latin ''ramus'' ("branch"), referring to the acute angle of the final tooth of the claws relative to the rest of the claw. ''Acutiramus'' is classified as part of the eurypterid family Pterygotidae, a family differentiated from other eurypterids by their flattened telsons (the most posterior segment of the body) and their modified chelicerae (frontal appendages), ending in well-developed chelae (claws). Many pterygotid eurypterids, such as ''Jaekelopterus'' and ''Pterygotus'', grew to gigantic proportions. ''Acutiramus'' wa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ciurcopterus
''Ciurcopterus'' is a genus of eurypterid, an extinct group of aquatic arthropods. Fossils of ''Ciurcopterus'' have been discovered in deposits of Late Silurian age in North America. Formerly classified as part of the family Pterygotidae, but placed into a separate family Ciurcopteridae in a 2025 paper, the genus contains two species, ''C. sarlei'' from Pittsford, New York and ''C. ventricosus'' from Kokomo, Indiana. The genus is named in honor of Samuel J. Ciurca, Jr., who has contributed significantly to eurypterid research by discovering a large amount of eurypterid specimens, including the four specimens used to describe ''Ciurcopterus'' itself. ''Ciurcopterus'' was formerly classed as the most basal (primitive) known member of the Pterygotidae, and combined characteristics of more derived members of the family with features of close relatives of the group, such as ''Slimonia''. Measuring 70 centimetres (28 inches) in length, ''Ciurcopterus'' was relatively large though smal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eurypterid
Eurypterids, often informally called sea scorpions, are a group of extinct marine arthropods that form the Order (biology), order Eurypterida. The earliest known eurypterids date to the Darriwilian stage of the Ordovician period, 467.3 Myr, million years ago. The group is likely to have appeared first either during the Early Ordovician or Late Cambrian period. With approximately 250 species, the Eurypterida is the most diverse Paleozoic Chelicerata, chelicerate order. Following their appearance during the Ordovician, eurypterids became major components of marine faunas during the Silurian, from which the majority of eurypterid species have been described. The Silurian genus ''Eurypterus'' accounts for more than 90% of all known eurypterid specimens. Though the group continued to diversify during the subsequent Devonian period, the eurypterids were heavily affected by the Late Devonian extinction event. They declined in numbers and diversity until becoming extinct during the Permi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Erettopterus
''Erettopterus'' is a genus of large predatory eurypterid, an extinct group of aquatic arthropods. Fossils of ''Erettopterus'' have been discovered in deposits ranging from Early Silurian (the Rhuddanian age) to the Early Devonian (the Lochkovian age), and have been referred to several different species. Fossils have been recovered from two continents; Europe and North America. The genus name is composed by the Ancient Greek words ἐρέττω (''eréttō''), which means "rower", and πτερόν (''pterón''), which means "wing", and therefore, "rower wing". ''Erettopterus'' is classified as part of the eurypterid family Pterygotidae, a family differentiated from other eurypterids by their flattened telsons (the most posterior segment of the body) and their modified chelicerae (frontal appendages), ending in well-developed chelae (claws). Although some pterygotid eurypterids, such as ''Jaekelopterus'' or ''Acutiramus'' grew to gigantic proportions, it is estimated that the la ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jaekelopterus
''Jaekelopterus'' is a genus of predatory eurypterid Eurypterids, often informally called sea scorpions, are a group of extinct marine arthropods that form the Order (biology), order Eurypterida. The earliest known eurypterids date to the Darriwilian stage of the Ordovician period, 467.3 Myr, mil ..., a group of extinct aquatic arthropods. Fossils of ''Jaekelopterus'' have been discovered in deposits of Early Devonian age, from the Pragian and Emsian stages. There are two known species: the type species ''J. rhenaniae'' from Brackish water, brackish to fresh water strata in the Rhineland, and ''J. howelli'' from Estuary, estuarine strata in Wyoming. The generic name combines the name of German paleontologist Otto Jaekel, who described the type species, and the Ancient Greek, Greek word () meaning 'wing'. Based on the isolated fossil remains of a large Chelicerae, chelicera (claw) from the Klerf Formation of Germany, ''J. rhenaniae'' has been estimated to have reached ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jaekelopterus Rhenaniae
''Jaekelopterus'' is a genus of predatory eurypterid, a group of extinct aquatic arthropods. Fossils of ''Jaekelopterus'' have been discovered in deposits of Early Devonian age, from the Pragian and Emsian stages. There are two known species: the type species ''J. rhenaniae'' from brackish to fresh water strata in the Rhineland, and ''J. howelli'' from estuarine strata in Wyoming. The generic name combines the name of German paleontologist Otto Jaekel, who described the type species, and the Greek word () meaning 'wing'. Based on the isolated fossil remains of a large chelicera (claw) from the Klerf Formation of Germany, ''J. rhenaniae'' has been estimated to have reached a size of around 2.3–2.6 metres (7.5–8.5 ft), making it the largest arthropod ever discovered, surpassing other large arthropods such as fellow eurypterids ''Acutiramus'' and ''Pterygotus''; the millipede ''Arthropleura''. ''J. howelli'' was much smaller, reaching 80 centimetres (2.6 ft) in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Necrogammarus
''Necrogammarus salweyi'' is the binomial name applied to an arthropod fossil discovered in Herefordshire, England. The fossil represents a fragmentary section of the underside and an Arthropod leg, appendage of a Pterygotidae, pterygotid eurypterid, a group of large and predatory aquatic arthropods that lived from the late Silurian to the late Devonian. The ''Necrogammarus'' fossil is Late Silurian in age and its generic name means "dead lobster", deriving from Ancient Greek νεκρός (''nekrós'', “dead body”) and Latin ''gammarus'' ("lobster"). Historically classified as either a millipede or a crustacean (hence the name) and once considered to potentially represent the oldest Myriapoda, myriapod in the fossil record, ''Necrogammarus'' was first revealed to represent a fragmentary section of a large pterygotid eurypterid in 1986 by the researcher Paul Selden. As two large pterygotids are already known from the same locality and same timespan as ''Necrogammarus'', ''Eret ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
20210106 Jaekelopterus Rhenaniae
1 (one, unit, unity) is a number, numeral, and glyph. It is the first and smallest positive integer of the infinite sequence of natural numbers. This fundamental property has led to its unique uses in other fields, ranging from science to sports, where it commonly denotes the first, leading, or top thing in a group. 1 is the unit of counting or measurement, a determiner for singular nouns, and a gender-neutral pronoun. Historically, the representation of 1 evolved from ancient Sumerian and Babylonian symbols to the modern Arabic numeral. In mathematics, 1 is the multiplicative identity, meaning that any number multiplied by 1 equals the same number. 1 is by convention not considered a prime number. In digital technology, 1 represents the "on" state in binary code, the foundation of computing. Philosophically, 1 symbolizes the ultimate reality or source of existence in various traditions. In mathematics The number 1 is the first natural number after 0. Each natural number, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Systematics Association
The Systematics Association (SystAss for short) is a charitable organisation based in the UK founded in 1937 for the promotion of the study of systematics and taxonomy. It publishes research, organises conferences, and provides competitive research funds for systematics research. History The society arose from informal meetings held between Royal Botanic Gardens, Kew & John Innes Horticultural Institute (Merton) staff, leading to the formation of a joint zoological and botanical "Committee on Systematics in Relation to General Biology" on May 3, 1937. The council then changed the name of the organisation to its present form. The original founding council included: Julian Huxley (Chairman), Hampton Wildman Parker (Zoological Secretary), and J. S. L. Gilmour (Botanical Secretary). Functions It publishes book volumes on a variety of related topics in the ''Systematics Association Special Volume Series'' and a newsletter for members called ''The Systematist''. An annual meeting espe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
