liik
Didymograptus extensus (Hall, 1858)
Sünonüümika
1858 Graptolithus extensus — Hall , lk. 132
1901 Didymograptus extensus — Elles & Wood , lk. 8-9, joon. 1:1a,v; text fig. 4a-d
1947 Didymograptus extensus — Ruedemann , lk. 331-332, joon. 55:16; 56:1,2
1960 Didymograptus extensus — Berry , lk. 60-61, joon. 6:5; 8:10
1976 Didymograptus extensus (hall) — Braithwaith , lk. 48, joon. 9:10, 11, 13
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Klassifikatsioon
| organismirühm | Biota |
| domeen | Eukaryota |
| riik | Animalia |
| hõimkond | Hemichordata |
| klass | Pterobranchia |
| alamklass | Graptolithina |
| selts | Graptoloidea |
| alamselts | Dichograptina |
| sugukond | Didymograptidae |
| perekond | Didymograptus |
| liik | acutus |
| artus | |
| broggeri | |
| cinereus | |
| decens | |
| ensjoensis | |
| extensus | |
| flexilis | |
| geminus | |
| goldschmidti | |
| grandis | |
| holtedahli | |
| kreklingensis | |
| leptograptoides | |
| murchisoni | |
| opimus | |
| oscillatoris | |
| pakrianus | |
| primigenius | |
| propinquus | |
| protoindentus | |
| serpens | |
| slemmestadi | |
| stensbergensis | |
| vicinatus |