Orthograptus calcaratus (Lapworth, 1876)

Synonymy list
1907     Diplograptus (Orthograptus) calcaratus — Elles et Wood, pp. 239-241, fig. 30:1a-c
1975     Rectograptus calcaratus (Lapworth) — Ulst, pp. 78-79, fig. 2:10; 1:9
Selection of related publications
Goldman, D., Nõlvak, J., Maletz, J. 2015. Middle to Late Ordovician graptolite and chitinozoan biostratigraphy of the Kandava-25 drill core in western Latvia. GFF 137, 3, 197-211. DOI:10.1080/11035897.2015.1021375
References based on distribution