Page:A Revision of the Families and Genera of the Stylonuracea (Eurypterida).djvu/31

 Stratigraphic range.—Lower Carboniferous; Upper Devonian (?).

The following species are recognized:

Diagnosis.—Hibbertopteridae with subelliptical prosoma, narrow at base and broadest at midsection; compound eyes reniform, without annular cuticular thickening, located in posterior half of prosoma.

Type species.—Limulus oculatus Kutorga, 1838.

Distribution.—Urals, U.S.S.R.

Stratigraphic range.—Upper Carboniferous-Permian.

Recognized species for this genus: