Archiretiolitinae

Pipiograptus hesperus, from Bulman (1970).

Belongs within: Reclinata.

The Archiretiolitinae are a group of 'retiolitid' graptolites from the Upper Ordovician in which the initial part of the colony remains sclerotised, with the distal arms net-like.

Characters (from Bulman 1970): Sicula and initial portions of one or more proximal thecae sclerotised; development basically diplograptoid.

Archiretiolitinae
    |--Archiretiolites Eisenack 1935 B70
    |    `--*A. regimontanus Eisenack 1935 B70
    |--Orthoretiolites Whittington 1954 B70
    |    `--*O. hami Whittington 1954 B70
    |--Phormograptus Whittington 1955 B70
    |    `--*P. sooneri Whittington 1955 B70
    |--Pipiograptus Whittington 1955 B70
    |    `--*P. hesperus Whittington 1955 B70
    `--Plegmatograptus Elles & Wood 1908 B70
         `--*P. nebula Elles & Wood 1908 B70
              |--P. n. nebula F71
              `--P. n. caudatus (Hall 1902) [=Retiolites caudatus] F71

*Type species of generic name indicated

REFERENCES

[B70] Bulman, O. M. B. 1970. Graptolithina with sections of Enteropneusta and Pterobranchia. In Treatise on Invertebrate Paleontology Part V 2^nd ed. (C. Teichert, 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.