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Adelophthalmus approximatus

Eurypterida - Adelophthalmidae

Discussion

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.

Taxonomy
Eurypterus approximatus was named by Hall and Clarke (1888). It is not extant. Its type specimen is SMP IP-12793.

It was recombined as Adelophthalmus approximatus by Tetlie (2007), Plotnick (2022).

Sister species lacking formal opinion data
A. brasdorensis

Synonymy list
YearName and author
1888Eurypterus approximatus Hall and Clarke
2007Adelophthalmus approximatus Tetlie
2022Adelophthalmus approximatus Plotnick

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Protostomia
—EcdysozoaAguinaldo et al. 1997
—Panarthropoda
phylumArthropodaGravenhorst 1843
—Deuteropoda
RankNameAuthor
subphylumChelicerataHeymons 1901
orderEurypteridaHuxley 1857
suborderEurypterinaNovojilov 1962
infraorderDiploperculata
superfamilyAdelophthalmoideaTollerton 1989
familyAdelophthalmidaeTollerton 1989
genusAdelophthalmusJordan and von Mayer 1854
speciesapproximatus()

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

†Adelophthalmus approximatus Hall and Clarke 1888
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Diagnosis
No diagnoses are available