Larger than M. hypostoma, tail with spine and prickles (Ref. 6902).
- Bigelow, H.B. and W.C. Schroeder 1953 Sawfishes, guitarfishes, skates and rays. p. 1-514. In J. Tee-Van et al. (eds.) Fishes of the western North Atlantic. Part two. New Haven, Sears Found. Mar. Res., Yale Univ. (Ref. 6902) http://www.fishbase.org/references/FBRefSummary.php?id=6902&speccode=140
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