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Megalograptus was a genus of large megalograptid eurypterids. The largest species was M. ohioensis, which ranged in length from 49 to 78 centimeters (1 foot 7 inches to 2 feet 7 inches). M. ohioensis was the second largest megalograptid and the second largest eurypterid of the Ordovician period, smaller only than the related Pentecopterus, which could grow to 170 cm (5 ft 7 in).[1] Previous estimates have placed the size of some species of Megalograptus as substantially larger, with the type species M. welchi once believed to have reached lengths of 150 cm (4 ft 11 in) in length. According to a 2009 study by James Lamsdell and Simon J. Braddy, such estimates are dubious as they are based on ornamentation in incomplete fossils.[2] In the case of M. shideleri, once estimated to have reached lengths of 200 cm (6 ft 7 in),[2] the size estimate was based only on two fragmentary tergites (upper portions of body segments), wherein the dimensions of the ornamental scales were unusually large, interpreted as suggesting a giant body size. The fact that scales can vary in size across the bodies of megalograptid eurypterids and that one of the relevant tergites of M. shideleri was not longer than 3 cm (1.2 in) suggests that this species did not reach lengths of more than 56 cm (1 ft 10 in).[1] The length of the species M. alveolatus is uncertain,[2] but it was much smaller than M. ohioensis,[3] and M. williamsae grew to about 50 cm (1 ft 8 in). The smallest known species of Megalograptus was an as yet undescribed Canadian species which only grew to 10 cm (3.9 in) in length.[2] Morphology Megalograptus was morphologically unique and easily distinguishable from other eurypterids. The carapace (head plate) of Megalograptus was vaguely quadratic in shape and flattened, lacking a marginal rim, which was present in some other eurypterids. At the front of the carapace there was a downturn and six small downward-facing spikes, possibly an adaptation for digging in t
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