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

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174
FIELDIANA: GEOLOGY, VOLUME 14
Dolichopterus bulbosus Kjellesvig-Waering, 1961 Siluro-Devonian England
Dolichopterus herkimerensis Caster and Kjellesvig-Waering, 1956 Silurian New York
Dolichopterus jewetti Caster and Kjellesvig-Waering, 1956 Silurian New York
Dolichopterus lancmani (Delle), 1936 Devonian U.S.S.R.
Dolichopterus macrocheirus Hall, 1859 Silurian New York
Dolichopterus siluriceps Clarke and Ruedemann, 1912 Silurian New York
Dolichopterus størmeri Caster and Kjellesvig-Waering Silurian Oesel


Genus Strobilopterus Ruedemann, 1935

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.


Genus Ruedemannipterus, new genus

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.