Graptolite family:  RETEOGRAPTIDAE Mu, 1974
Diagnosis: Biserial axonophoran with periderm reticulate; clathria developed; structure of lists regular,
without reticulumn and lacinia; thecal periderm normal.

Distribution: Asia, Europe, Oceania, North America; uppermost Lower Ordovician to Upper Ordovician.

Genera:
I. First group: Virgula extending freely into clathria, but not connected with lists; both median strands
zigzag in appearance.
Reteograptus Hall, Pararetiograptus Mu, Pseudoreteograptus Mu, Orthoretiograptus MU
II. Second group: Virgula merging with one of the median strands to form a straight virgular strand; hence
the presence of two median strands, with one curved and the other straight.
Orthoretiolites Whittington, Sinoretiograptus Mu.
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Source: Mu Enzhi, Li Jijin, Ge Meiyu, Chen Xu, Lin Yaokun and Ni Yunan. 1993. Upper Ordovician
graptolites of central China region. - Palaeontologia Sinica 182, B, 29, 1-393.
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