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†Penygaspididae Halstead 1993
urn:lsid:organismnames.com:name:1091089
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575
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†Penygaspididae Halstead 1993
Halstead 1993. Agnatha. Benton, M.J.[Ed]. The fossil record 2., Chapman & Hall, London, Glasgow etc., 1993: i-xvii, 1-845. Chapter pagination: 573-581