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The Swimbladder and Associated Structures in Western Atlantic Sea Robins (Triglidae)

1973; American Society of Ichthyologists and Herpetologists; Volume: 1973; Issue: 2 Linguagem: Inglês

10.2307/1442970

1938-5110

Robert R. Evans,

Physiological and biochemical adaptations

The morphology of the swimbladder and associated structures in four species of Bellator and fourteen species of Prionotus (Triglidae) from the western Atlantic is examined. Triglid swimbladders are divided externally into lateral lobes and internally into lateral chambers by a median septum. Intrinsic sonic muscles are present in all species investigated. Extrinsic sonic muscles are present in all species of Bellator and in nine of the fourteen species of Prionotus examined. Presence of extrinsic sonic muscles in these genera is previously undescribed. Sonic musculature in both genera is innervated by a branch of an occipital spinal nerve. Arterial blood supply is via a branch of the dorsal aorta. Histological examination reveals a pseudo-massive type gas gland. Arterial blood supply to the gas gland is by a branch of the coeliaco-mesenteric artery; venous return is by the hepatic portal system. Veins returning blood from resorbent capillaries located in the left chamber posterior to the diaphragm enter the posterior cardinal vein.