Species

Didymograptus extensus (Hall, 1858)

Synonymy list
1858     Graptolithus extensus — Hall , pp. 132
1901     Didymograptus extensus — Elles & Wood , pp. 8-9, fig. 1:1a,v; text fig. 4a-d
1947     Didymograptus extensus — Ruedemann , pp. 331-332, fig. 55:16; 56:1,2
1960     Didymograptus extensus — Berry , pp. 60-61, fig. 6:5; 8:10
1976     Didymograptus extensus (hall) — Braithwaith , pp. 48, fig. 9:10, 11, 13