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Table 1 Pentecopterus decorahensis prosomal ventral plate measurements

From: The oldest described eurypterid: a giant Middle Ordovician (Darriwilian) megalograptid from the Winneshiek Lagerstätte of Iowa

Specimen Total length Maximum width Rostrum width Main body length Posterior process Lateral projections
Length Width Length Width
SUI 139914 42a 22a 42a 22
SUI 139915 64a 23a 64a 8
SUI 139916 144a 42a 61a 97 21
SUI 139917 60 62 29 28 5 4 32 7
SUI 139921 28a 24a 28 24
SUI 139936 66a 76a 35a 43 13 10 23a 19
SUI 139941 89a 111a 28a 57 19 14 16a 8a
SUI 139978 102a 40a 29a 72 13
SUI 139979 94a 122a 63a 52a 27a 21
SUI 139982 69a 33a 15a 54a 17
SUI 140009 54a 12a 54a 12a
SUI 140011 61a 21a 61a 21
  1. All measurements in millimetres
  2. aindicates an incomplete measurement