Diplograptidae
Classification
Phylum: Hemichordata
Class: Graptolithina
Order: Graptoloidea
Family: Diplograptidae (Lapworth, 1873)
Cincinnatian Genera: Arnheimograptus, Geniculograptus
Geologic Range
Late Ordovician – Late Silurian
Common Paleoecology
Diplograptidae is an extinct family of passively mobile planktonic suspension feeders
Description of the Family
- Scandent biserial, with straight stripes
- Median septum may be present or absent, or partially present
- Thecae straight or with carrying degrees of sigmoidal curvature
- Unspined or with apertural or mesial spines restricted to base of rhabdosome
- Rhabdosome oval, circular or rectangular in cross section
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Treatise on Invertebrate Paleontology, Part V (1955):
Treatise on Invertebrate Paleontology, Part V (1955):
- Scandent biserial, with straight stripes, adnate dorsally, with or without median septum or with incomplete or partial septum; thecae straight or with carrying degrees of sigmoidal curvature; usually unspined or with apertural or mesial spines restricted to base of rhabdosome, which is oval, circular or rectangular in cross section; periderm continuous, rarely attenuated or supported by lists; development of diplograptid type.
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Arnheimograptus
Geniculograptus
