percid (persid)

and a. I. n. A perch, as a member of the Percidæ. II. a . Like a perch; percoid or percine. Percidæ (per'si-dē), n. pl . [NL., Perca + -idæ.] The perch family, a group of acanthopterygian fishes, to which widely varying limits have been a igned. (a) In Bonaparte's system, same as the first family of acanthopterygian fishes in Cuvier's system ( Percoides in French). It included those with oblong bodies covered with scales which are generally hard or rough, with the operculum or pre operculum (or both) dentated or spinous at the edge, and the jaws and some part of the palate toothed. With such definition it included not only the modern Percidæ proper, but also many other families. (b) In Günther's system, the representative family of his Acanthopterygii perciformes , having perfect ventrals, unarmed cheeks, uninterrupted lateral line, acute teeth in the jaws and on the palate, no barbels, the lower pectoral rays branched, and the vertical fins not scaly. (c) In recent American systems, Percoidea with an increased number of abdominal and caudal vertebræ, depre ed cranium and little prominent cranial ridges, dorsal fins generally separate, and anal with one or two spines. The species are inhabitants of fresh waters, and are represented by two genera common to North America and Europe ( Perca and Stizostedion ), several peculiar to the Pale arctic region ( Acerina , Aspro , Per car in a ), and the numerous darters, constituting the subfamily Eth eos to minæ , peculiar to North America. percidal (per'si-dal), a. [