Adelophthalmus

rdf:langString Adelophthalmus

rdf:langString right

rdf:langString Jordan in Jordan & von Mayer, 1854

rdf:langString horizontal

rdf:langString Drawings of the ventral and dorsal sides of fossils of A. nebraskensis.

rdf:langString Early Devonian–Early Permian,

rdf:langString AmJourSci 4 38 228 509 figure 1.jpg

rdf:langString AmJourSci 4 38 228 509 figure 2.jpg

rdf:langString Fossil specimen of A. mansfieldi illustrated by James Hall

rdf:langString

rdf:langString (Chernyshev, 1933)

rdf:langString (Jordan, 1854)

rdf:langString (Kues & Kietzke, 1981)

rdf:langString (Lamsdell et al., 2020)

rdf:langString (Lamsdell, Simonetto & Selden, 2013)

rdf:langString (Přibyl, 1952)

rdf:langString (Shpinev & Filimonov, 2018)

rdf:langString (Shpinev, 2006)

rdf:langString (Shpinev, 2012)

rdf:langString †?A. carbonarius

rdf:langString †?A. lohesti

rdf:langString †?A. perornatus

rdf:langString †?A. raniceps

rdf:langString †A. approximatus

rdf:langString †A. asturica

rdf:langString †A. bradorensis

rdf:langString †A. cambieri

rdf:langString †A. chinensis

rdf:langString †A. corneti

rdf:langString †A. douvillei

rdf:langString †A. dubius

rdf:langString †A. dumonti

rdf:langString †A. granosus

rdf:langString †A. imhofi

rdf:langString †A. irinae

rdf:langString †A. kamyshtensis

rdf:langString †A. khakassicus

rdf:langString †A. kidstoni

rdf:langString †A. luceroensis

rdf:langString †A. mansfieldi

rdf:langString †A. mazonensis

rdf:langString †A. moyseyi

rdf:langString †A. nebraskensis

rdf:langString †A. pennsylvanicus

rdf:langString †A. piussii

rdf:langString †A. pruvosti

rdf:langString †A. pyrrhae

rdf:langString †A. sellardsi

rdf:langString †A. sievertsi

rdf:langString †A. waterstoni

rdf:langString †A. wilsoni

rdf:langString †A. zadrai

rdf:langString Species

rdf:langString

rdf:langString (Decker, 1938)

rdf:langString (Goldenberg, 1873)

rdf:langString (Hall, 1884)

rdf:langString (Meek & Worthen, 1868)

rdf:langString (Peach, 1882)

rdf:langString (Reuss, 1855)

rdf:langString (Størmer, 1974)

rdf:langString (Woodward, 1907)

rdf:langString A. caledonicus

rdf:langString A. oklahomensis

rdf:langString Anthraconectes

rdf:langString Eurypterus derbiensis

rdf:langString Eurypterus stylus

rdf:langString Eurypterus trapezoides

rdf:langString Glyptoscorpius

rdf:langString Lepidoderma

rdf:langString Polyzosternites

rdf:langString Adelophthalmus

rdf:langString Adelophthalmus granosus

rdf:langString Jordan in Jordan & von Meyer, 1854

rdf:langString Adelophthalmus is a genus of eurypterid, an extinct group of aquatic arthropods. Fossils of Adelophthalmus have been discovered in deposits ranging in age from the Early Devonian to the Early Permian, which makes it the longest lived of all known eurypterid genera, with a total temporal range of over 120 million years. Adelopththalmus was the final genus of the Eurypterina suborder of eurypterids and consisted the only known genus of swimming eurypterids from the Middle Devonian until its extinction during the Permian, after which the few surviving eurypterids were all walking forms of the suborder Stylonurina. Fossils of Adelophthalmus have been described from four continents; North America, Europe, Asia and Australia, which indicates that Adelophthalmus might have had a nearly cosmopolitan (worldwide) distribution, one of few eurypterid genera to achieve one besides potentially Pterygotus. The territorial expansion of Adelophthalmus had begun early, with representatives found in both Siberia and Australia during the Devonian, but it first gained its almost cosmopolitan distribution following the amalgamation of the supercontinent Pangaea during the Carboniferous and Permian. The generic name Adelophthalmus means "no obvious eye", referencing that the holotype fossil seemingly represented an eyeless eurypterid, with a carapace (head plate) completely lacking any indication of eyes. Though this has caused much subsequent confusion, including the naming of several junior synonyms, the apparent eyelessness of the type specimen is treated by modern researchers as a preservational artifact, and not a feature that any species of Adelophthalmus would have possessed in life. Adelophthalmus was a genus of comparatively small eurypterids, with species ranging in size from 4 cm (1.6 in, A. douvillei) to 32 cm (12.6 in, A. khakassicus). As of 2020, Adelophthalmus is the most taxonomically diverse of all eurypterid genera, containing 33 species considered valid. This large amount of species, many named long ago, have prompted some researchers to designate Adelophthalmus as a "wastebasket taxon" with poorly known internal relationships and phylogeny. The genus as it is currently seen may form a monophyletic group (a group sharing a common ancestor) but might most appropriately be split into different genera along distinct clades formed within the current confines of the genus.