Page:A Revision of the Families and Genera of the Stylonuracea (Eurypterida).djvu/10

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 * Dolichopterus bulbosus Kjellesvig-Waering, 1961 || style="white-space:nowrap;" | Siluro-Devonian || England
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 * Dolichopterus herkimerensis Caster and Kjellesvig-Waering, 1956 || Silurian || style="white-space:nowrap;" | New York
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 * Dolichopterus jewetti Caster and Kjellesvig-Waering, 1956 || Silurian || New York
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 * Dolichopterus lancmani (Delle), 1936 || Devonian || U.S.S.R.
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 * Dolichopterus macrocheirus Hall, 1859 || Silurian || New York
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 * Dolichopterus siluriceps Clarke and Ruedemann, 1912 || Silurian || New York
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 * Dolichopterus størmeri Caster and Kjellesvig-Waering || Silurian || Oesel
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Diagnosis.—Dolichopteridae of medium size; test covered with pustules and semi-lunar scales; prosoma semiovate; compound eyes submarginal; ocelli unknown; ventral doublure unknown; sixth appendages with movable, supplementary flat lobes on distal joints, ultimate joint forming large, flat lobe; distal joints and lobes forming paddle with strongly serrate margin; metastoma very narrow, cordate at anterior end; base unknown; male median appendage very long, consisting of one undivided joint; metasoma contracted past first tergite; telson unknown (Kjellesvig-Waering and Størmer, 1952, p. 660).

Type species.—Pterygotus princetonii Ruedemann, 1934.

Distribution.—Wyoming.

Stratigraphic range.—Lower Devonian.

Remarks.—Strobilopterus princetonii (Ruedemann) remains as the only known species.

Diagnosis.—Dolichopteridae of small size; distinctly stylonuroid in general aspect; carapace longer than wide; considerably wider in front than behind, making base of carapace narrowest part; eyes large, with narrow arcuate visual area, and large palpebral lobes located anteriorly and intramarginally on the carapace; axes of eyes parallel; ocelli located midway between, or grouped with the lateral eyes; prosomal appendages unknown except the sixth which are greatly elongated, subcylindrical legs having the last three joints flattened into numerous, narrow, leaf-like supplementary lobes; mesosoma very narrow; integument mainly smooth.