Species
Didymograptus extensus (Hall, 1858)
Synonyymit
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
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