They have a number of common characteristics such as an alarm substance and a Weberian apparatus.

In otophysians, one of the main characteristics is the Weberian apparatus.

The Weberian apparatus elements form from the fully distinguishable first five vertebrae of the individual.

Study of the embryology of the Weberian apparatus has since been conducted on various other ostariophysan species.

Like other orders of the Ostariophysi, the cypriniformes possess a Weberian apparatus.

In the Weberian apparatus, the posterior supraneural bone is elongated and contacts the skull at the forward end.

The species possesses a primitive but complete Weberian Apparatus, formed from the first four vertebrae of the spinal column.

Characins possess a Weberian apparatus, a series of bony parts connecting the swim bladder and inner ear.

They are characterized by a primitive Weberian apparatus formed by the first three vertebrae and one or more cephalic ribs within the head.

Fishes of the superorder Ostariophysi possess a structure called the Weberian apparatus, a modification which allow them to hear better.

In addition, a structure composed of fused neural spines form the dorsalmost part of the Weberian apparatus.

Indeed, the entire phylogeny of the Ostariophysi - fishes possessing a Weberian apparatus - has yet to be conclusively settled.

The claustrum, an element in modern apparati, is noticeably absent from the Weberian apparatus of S. diasii.

Rasbora maculata also possesses the Weberian apparatus a modification to the vertebrae immediately behind the skull, which joins the swimbladder to the inner ear.

Anatomically, the labeonins are distinguished by the Weberian apparatus contacting the skull with the supraneural bones, and its basioccipital process being concave in cross-section.

The Weberian apparatus is an anatomical structure that connects the swim bladder to the auditory system in fishes belonging to the Superorder Ostariophysi.

The subgenus Malacobagrus is characterized by their derived lateral line, Weberian apparatus, a subquadrangular gill cover (as opposed to triangular in other species), and pectoral spine.

The anterior chamber is connected to the inner ear by a series of small bones derived from neck vertebrae called the Weberian apparatus, which greatly enhances its hearing capability.

In the aforementioned taxon, the Weberian apparatus is fairly developed; there is a distinguishable intercalarium and a tripus which articulate with the second and third vertebrae respectively.

These catfish have a single pair of mandibular barbels, an elongated Weberian apparatus firmly sutured to the basioccipital, and the sensory canal on the posttemporal enclosed with bone.

A fully functioning Weberian apparatus consists of the swim bladder, the Weberian ossicles, a portion of the anterior vertebral column, and some muscles and ligaments.

The earliest recorded incidence of a Weberian apparatus is from the fossil fish Santanichthys diasii dating from the Early Cretaceous of Northeastern Brazil.

The Weberian apparatus functions by transmitting auditory signals straight from the gas bladder, through the Weberian ossicles and then straight into the labyrinth structures of the inner ear.

The remaining elements of the fifth vertebra (V5), the parapophysis and the articulating rib (R3), including the vertebra itself form the posterior structure of the Weberian apparatus.

Only the first four vertebrae are involved in the Weberian apparatus of Santanichthys; There are no signs of involvement from the elements of the fifth vertebra unlike in modern otophysans.