The Cyrtograptus (1867)
Phylum : Hemichordata Class : Graptolithina Order : Graptoiloidea Suborder : Virgellina Family : Monograptidae Genus : Cyrtograptus Species : C. murchisoni, C. egregius, C. rigidus, C. centrifugus, C. sakmaricus, C. kriki, C. lundgreni, C. ellesi, C. symmetricus
Silurian (430 Ma)
Oceans worldwide (map)













