Pectoral fin

Definition and stakes

Portrait of George Albert Boulenger George Albert Boulenger,  The Cambridge natural history, Vol… (1904)

“ Lower pharyngeal bones united. Praecaudal vertebrae with strong parapophyses supporting the ribs. Body covered with cycloid scales. Pectoral fins inserted very high up; ventral fins widely separated from the pectorals, without spines, with 6 rays. Dorsal fin opposed to the anal, and likewise formed entirely of soft rays. Air-bladder generally present, sometimes cellular.
The shape of the head and body vary greatly, and the pectoral fin may reach an extraordinary wing-like development. The dorsal fin may be followed by a series of finlets, as in many of the Scombridae.
”
Source: Gutenberg

Portrait of George Albert Boulenger George Albert Boulenger,  The Cambridge natural history, Vol… (1904)

“ The obtusely or acutely lobate pectoral fins articulate with the pectoral girdle by a single basal endoskeletal element. Nostrils on the ventral surface of the snout. Two dorsal fins and an anal fin. Dermal bones of the ethmoid region often fused with one another and with the premaxillae in front and the frontals behind to form a continuous rostral shield. Infra-dentary bones may be present. ”
Source: Gutenberg

1911 Encyclopædia Britannica (1911)

“ Sub-Order XIII.—PEDICULATI
Air-bladder without duct. Opercle well developed, hidden under the skin; supra occipital in contact with the frontals. Pectoral arch suspended from the skull; no mesocoracoid bone. Ventral fins, if present, jugular. Gill-opening reduced to a foramen situated in or near the axil more or less posterior to the base of the pectoral fin. Body naked or covered with spines or bony tubercles.
”
Source: Wikisource

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