Pycnodontoidei

Apomesodon gibbosus, copyright Ghedoghedo.

Belongs within: Pycnodontiformes.
Contains: Pycnodontidae.

The Pycnodontoidei are a clade of pycnodontiform fishes characterised by the loss of scales over much of the body (Poyato-Ariza & Wenz 2002).

Characters (from Poyato-Ariza & Wenz 2002): Opercular process of hyomandibular absent; ossifications in gular region absent; two branchiostegal rays, thin and separated; crenulations on vomerine and prearticular teeth occasional and weak if present; scales not covering the whole body; scales rows between bases of lepidotrichia of unpaired fins absent.

Pycnodontoidei
    |–Eomesodon Woodward 1918 P-AW02
    |    |–*E. liassicus (Egerton 1855) [=Pycnodus liassicus] P-AW02
    |    |–E. barnesi (Woodward 1906) P-AW02
    |    |–E. depressus Woodward 1918 P-AW02
    |    `–E. hoeferi (Gorjanovic-Kramberger 1905) P-AW02
    `–+–Apomesodon Poyato-Ariza & Wenz 2002 P-AW02
       |    |–*A. gibbosus (Wagner 1851) [=Mesodon gibbosus, Gyrodus gibbosus Agassiz 1843 (n. n.)] P-AW02
       |    |–A. comosus (Thiollière 1858) [=Mesodon comosus, Macromesodon comosus] P-AW02
       |    `–A. surgens Poyato-Ariza & Wenz 2002 P-AW02
       `–Pycnodontoidea P-AW02
            |–Pycnodontidae P-AW02
            `–Coccodontidae P-AW02
                 |–Trewavasia White & Moy-Thomas 1941 P-AW02
                 |    `–*T. carinatus (Davis 1887) [=Xenopholis carinatus] P-AW02
                 `–+–Ichthyoceros Gayet 1984 P-AW02
                    |    `–*I. spinosus Gayet 1984 P-AW02
                    `–Coccodus Pictet 1850 P-AW02
                         |–*C. armatus Pictet 1850 P-AW02
                         `–C. lindstroemi Davis 1890 (n. d.) P-AW02

*Type species of generic name indicated

REFERENCES

[P-AW02] Poyato-Ariza, F. J., & S. Wenz. 2002. A new insight into pycnodontiform fishes. Geodiversitas 24 (1): 139–248.

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