Dorypygidae
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Dorypygidae
''Dorypygidae'' is a family of trilobite belonging to the order Corynexochida. Genera * ''Atdabanella'' Repina 1965 * ''Basocephalus'' Ivshin 1952 * ''Bonnaria'' Lochman 1956 * ''Bonnia'' Walcott 1916 * ''Bonniella'' Resser 1937 * ''Bonnima'' Fritz 1991 * ''Bonniopsis'' Poulsen 1946 * ''Dorypyge'' Dames 1883 * ''Dorypygina'' Lermontova 1940 * ''Fordaspis'' Lochman 1956 * ''Hicksia'' Delgado 1904 * ''Holteria'' Walcott 1924 * ''Holyoakia'' Palmer and Rowell 1995 * ''Kootenia'' Walcott 1899 * ''Kooteniella'' Lermontova 1940 * ''Kooteniellina'' Sivov 1955 * ''Liokootenia'' Qiu 1983 * ''Mengzia'' Lo 1974 * ''Metakootenia'' Qiu 1983 * ''Ogygopsis'' Walcott 1889 * ''Olenoides'' Meek 1877 * ''Olenoidestranans'' Meek 1877 * ''Paraolenoides'' Ivshin 1952 * ''Popigaia'' Egorova 1967 * ''Prokootenia'' Lermontova 1940 * ''Protypus'' Walcott 1986 * ''Shipaiella'' Zhang et al. 1980 * ''Strettonia'' Cobbold 1931 * ''Tabatopygellina'' Sivov 1955 * ''Tolanaspis'' Ivshin 1952 References

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Holyoakia
''Holyoakia'' is a genus of very small (up to 7½ mm long) trilobites of the family Dorypygidae, from the late Lower Cambrian (Late Botonian) of South Australia and Antarctica. Etymology ''Holyoakia simpsoni'' was named in honor of David Simpson from Adelaide, who collected the first specimens. Distribution * ''Holyoakia granulosa'' has only been collected from the late Lower Cambrian of Antarctica (presumably Botomian, Shackleton Limestone, Central Transantarctic Mountains) * ''Holyoakia simpsoni'' only occurs in the late Lower Cambrian of South Australia (mid-late Botomian, Emu Bay Shale, Big Gully, Kangaroo Island). Taxonomy The genus was originally with reservation placed in the Emuellidae. The genus however lacks the specific characteristics of this family, most notably, the clearly furrowed Trilobite#Cephalon, glabella that is rounded at the frontal end, the hook-shaped eye ridges that run parallel to the margin of the head shield (or Trilobite#Cephalon, cephalon), c ...
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