The barrel-eye, Opisthoproctus, enters the LRT alongside the bonefish, Albula
Another overlooked interrelationship today.
Opisthoproctus soleatus (Vaillant 1888; 10.4cm; Figs. 1, 2) is a small, extant deep-sea fish with a transparent head and telescope eyes perpetually looking dorsally. Note the tiny mouth and the quadrate in front of the orbit only visible in the Gregory 1933 diagram (Fig. 2). Many of the fragile bones are transparent or nearly so (Fig. 2).
Albula vulpes
(Linneaus 1758; 105cm in length) is the extant bonefish. It feeds on deep sea floor and tidal invertebrates. Note the floating cheekbone, dorsal nares, open rostrum, shark-like premaxilla, and large frontal. The large number of pre-sacral vertebrae is a primitive trait. The heavy cycloid scales are also found in the barrel-eye. The high presacral vertebra count of the bonefish is greatly reduced in the shorter barrel-eye.
Let me know
if you find any citations linking bone fish and pycnodontiformes to barrel-eyes so I can promote them here.
References
Gregory WK 1933. Fish skulls. A study of the evolution of natural mechanisms. American Philosophical Society 23(2) 1–481.
Vaillant L 1888. Éxpeditions scientifiques du Travailleur et du Talisman pendant les années 1880, 1881, 1882, 1883. par L. Vaillant. Paris: G. Masson.
wiki/Opisthoproctus
wiki/Barreleye
wiki/Bonefishes
wiki/Argentiniformes
reptileevolution.com/albula.htm
Source: https://pterosaurheresies.wordpress.com/2021/04/20/the-barrel-eye-opisthoproctus-enters-the-lrt-alongside-the-bonefish-albula/
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