perennibranchiateadj.n.

1834 Philos. Trans. (Royal Soc.) 124 338 This bulb [of the aorta]..is permanent in Fish and perennibranchiate Reptiles.

1875 Encycl. Brit. I. 762/1 It is probable..that no known Labyrinthodonts were perennibranchiate.

1922 Jrnl. Linn. Soc.: Zool. 35 97 Crinoids are as ‘pædomorphic’ as any Perennibranchiate Amphibian.

1962 Q. Rev. Biol. 37 235/2 Many descendants of tetrapods secondarily reentered the water, to mention only various perennibranchiate urodeles, ichthyosaurs, [etc.].

1997 Internat. Jrnl. Developmental Biol. 41 533 Perennibranchiate amphibians retain their larval characters mainly because their tissues do not respond to thyroid hormones.

1848 J. Craig New Universal Dict. Perennibranchiates, Perennibranchiata, a division of the Brabranchian [sic] reptiles, including such as preserve the external branchiæ throughout life.

1871 Nature 28 Sept. 406/2 The development of lungs in the adult state and the co-existence of these organs with gills in the Perennibranchiates, were considered to be sufficient indications of their class-distinctness from fishes.

1925 Proc. Royal Soc. B. 98 141 An even more startling example is that afforded by the Perennibranchiates.

1976 Amer. Naturalist 110 659 Paedogenetic perennibranchiates are known in the Plethontidae..and Sirenidae.

2001 Russ. Jrnl. Herpetol. 8 179 These patterns are essentially different in the neotenic and paedomorphic forms, and also in various species of the perennibranchiates.