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Zygorhiza Whale Canine Replica measures 159mm or 4.1 inches. The Zygorhiza Whale Canine Replica is Museum quality cast in Polyurethane resins. Made in USA. Toothed whale of Eocene North Carolina. Zygorhiza (“Yoke-Root”) is an extinct genus of basilosaurid early whale known from the Late Eocene (Priabonian, 38–34 Ma) of Louisiana, Alabama, and Mississippi, United States, and the Bortonian to the late Eocene of New Zealand (43 to 33.9 million years ago). Specimens reported from Europe are considered Dorudontinae incertae sedis. Zygorhiza kochii is the state fossil of Mississippi. The mounted specimen in the Mississippi Museum of Natural Science in Jackson is commonly referred to as Ziggy.
Zygorhiza had a body similar to modern cetaceans with flipper-like forelimbs, rudimentary hind limbs, a vertebral column adapted for oscillatory swimming, and a tail fluke. The estimated the adult body mass for Zygorhiza was 7,388 lbs. based on an estimated body length of 200 in. Using CT scans, they estimated the brain weight to 26.04 oz.
Zygorhiza replaced their upper and lower deciduous first premolars with permanent teeth. This is very unusual in modern mammals and contrasts to extant toothed whales that only develop a single set of teeth. It might indicate that Zygorhiza represents a stage in archaeocete evolution where skeletal maturation was delayed like in modern cetaceans. Zygorhiza differs from all other dorudontines in the presence of well-developed cuspules on the cingula of the upper premolars.
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