Climacograptus bicornis, from the Natural History Museum.

Belongs within: Climacograptidae.

Climacograptus is a genus of graptoloids known from the Lower Ordovician to Lower Silurian, with a biserial and nearly circular rhabdosome (Bulman 1970).

Characters (from Bulman 1970): Rhabdosome nearly circular in cross section, scalariform views consequently common; thecae strongly geniculate, with deep apertural excavations, supragenicular wall straight, parallel to axis of rhabdosome.

Climacograptus Hall 1865B70
|--*C. bicornis (Hall 1848)B70 [=Graptolithus bicornisB70; incl. C. bicornis var. longispina Hall 1902F71]
|--C. affinis Hall 1900F71
|--C. antiquusF71
| |--C. a. antiquusB70
| `--C. a. bursiferB70
|--C. baragwanathiB70
|--C. brevisB04
|--C. caudatusF71
|--C. ensiformisB70
|--C. hastatas Hall 1902F71
|--C. inuitiRC79
|--C. mediusRG04
|--C. missilisF71
|--C. papilioB70
|--C. parvusB70
|--C. peltiferF71
|--C. ramulus (White 1871) [=Graptolithus (Climacograptus) ramulus]W77
|--C. rectangularisB70
|--C. scalarisB70
|--C. tridentatusF71
|--C. tubuliferus Lapworth 1876R93
|--C. typicalisB70
|--C. venustusB70
`--C. wilsoni [incl. C. wilsoni var. tubularis]F71

*Type species of generic name indicated


[B04] Botting, J. P. 2004. An exceptional Caradoc sponge fauna from the Llanfawr Quarries, central Wales and phylogenetic implications. Journal of Systematic Palaeontology 2 (1): 31–63.

[B70] Bulman, O. M. B. 1970. Graptolithina with sections on Enteropneusta and Pterobranchia. In: Teichert, C. (ed.) Treatise on Invertebrate Paleontology pt V 2nd ed. pp. V1–V149. The Geological Society of America, Inc.: Boulder (Colorado), and the University of Kansas: Lawrence (Kansas).

[F71] Fletcher, H. O. 1971. Catalogue of type specimens of fossils in the Australian Museum, Sydney. Australian Museum Memoir 13: 1–167.

[RG04] Racheboeuf, P. R., R. Gourvennec, M. Deynoux & D. Brice. 2004. The Devonian of the Hodh area (Islamic Republic of Mauritania): paleontology and stratigraphy. Journal of Paleontology 78 (1): 98–110.

[R93] Rickards, R. B. 1993. Graptolithina. In: Benton, M. J. (ed.) The Fossil Record 2 pp. 537–542. Chapman & Hall: London.

[RC79] Rickards, R. B., & P. R. Crowther. 1979. New observations on the mode of life, evolution and ultrastructure of graptolites. In: Larwood, G., & B. R. Rosen (eds) Biology and Systematics of Colonial Organisms pp. 397–410. Academic Press: London.

[W77] White, C. A. 1877. Report upon the invertebrate fossils collected in portions of Nevada, Utah, Colorado, New Mexico, and Arizona, by parties of the expeditions of 1871, 1872, 1873, and 1874. U.S. Geographical Surveys West of the One Hundredth Meridian 4 (1): 1–219, pls 1–21.

Leave a comment

Your email address will not be published. Required fields are marked *