Euchelicerata - Eurypterida - Adelophthalmidae

The original specimen seems to be lost, with the New York State Museum catalog listing only a plastotype (NYSM 4459). In 2012, however, Andrew Bush located in the collections of the State Museum of Pennsylvania a specimen collected by the 1800's by the Second Pennsylvania Geological Survey (Second Survey 9651, State Museum Pennsylvania : SMP IP-12793). It appears to be the counterpart of the holotype.

Alternative combination: Eurypterus approximatus

Full reference: J. Hall and J. M. Clarke. 1888. Descriptions of the trilobites and other Crustacea of the Oriskany, Upper Helderberg, Hamilton, Portage, Chemung and Catskill Groups. New York State Geological Survey, Palaeontology of New York 7:1-236

Belongs to Adelophthalmus according to R.E. Plotnick 2022

See also Hall and Clarke 1888

Sister taxa: Adelophthalmus (Eurypterus), Adelophthalmus asturica, Adelophthalmus brasdorense, Adelophthalmus cambieri, Adelophthalmus carbonarius, Adelophthalmus chinensis, Adelophthalmus corneti, Adelophthalmus douvillei, Adelophthalmus dubius, Adelophthalmus dumonti, Adelophthalmus granosus, Adelophthalmus imhofi, Adelophthalmus irinae, Adelophthalmus kamyshtensis, Adelophthalmus kidstoni, Adelophthalmus lohesti, Adelophthalmus luceroensis, Adelophthalmus mansfieldi, Adelophthalmus mazonensis, Adelophthalmus moyseyi, Adelophthalmus nebraskensis, Adelophthalmus pennsylvanicus, Adelophthalmus perornatus, Adelophthalmus piussii, Adelophthalmus pruvosti, Adelophthalmus pyrrhae, Adelophthalmus raniceps, Adelophthalmus sellardsi, Adelophthalmus sievertsi, Adelophthalmus waterstoni, Adelophthalmus wilsoni, Adelophthalmus zadrai, Glyptoscorpius kidstoni, Lepidoderma imhofi

Type specimen: SMP IP-12793

Ecology: nektobenthic carnivore

Distribution: found only at Sill Run - Warren (Devonian of Pennsylvania )

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Specimen images are retrieved through the ePANDDA API.