WebThe first anatomical structures many people identify on a fish are the fins. In fact, “appendages, when present, as fins” is part of one of the scientific definitions of a fish. Most fish have two kinds of fins: median and paired. … WebJun 25, 2012 · Their profoundly asymmetrical heads have one of the most unusual body plans among all backboned animals (vertebrates) but the evolution of their bizarre …
Flatfish fossils fill in evolutionary missing link
WebJun 25, 2012 · Friedman, M. Osteology of †Heteronectes chaneti (Acanthomorpha, Pleuronectiformes), an Eocene stem flatfish, with a discussion of flatfish sister-group relationships. Journal of Vertebrate ... Webpleuronectiform, (order Pleuronectiformes), also called flatfish, any one of about 680 species of bony fishes characterized by oval-shaped, flattened bodies as in the flounder, halibut, and turbot. The pleuronectiforms are … how pension affects social security
Pleuronectiform fish order Britannica
A flatfish is a member of the ray-finned demersal fish order Pleuronectiformes, also called the Heterosomata, sometimes classified as a suborder of Perciformes. In many species, both eyes lie on one side of the head, one or the other migrating through or around the head during development. Some species … See more Over 800 described species are placed into 16 families. Broadly, the flatfishes are divided into two suborders, Psettodoidei and Pleuronectoidei, with > 99% of the species diversity found within the Pleuronectoidei. … See more The most obvious characteristic of the flatfish is its asymmetry, with both eyes lying on the same side of the head in the adult fish. In some families, the eyes are usually on the right side of the body (dextral or right-eyed flatfish), and in others, they are … See more Flatfishes lay eggs that hatch into larvae resembling typical, symmetrical, fish. These are initially elongated, but quickly develop into a more rounded form. The larvae typically have protective spines on the head, over the gills, and in the pelvic and pectoral fins. … See more Flatfish is considered a Whitefish because of the high concentration of oils within its liver. Its lean flesh makes for a unique flavor that differs … See more Flatfishes are found in oceans worldwide, ranging from the Arctic, through the tropics, to Antarctica. Species diversity is centered in the Indo-West … See more • Brill • Dab • Sanddab • Flounder • Halibut • Megrim See more In 2008, a 50-million-year-old fossil, Amphistium, was identified as an early relative of the flatfish and transitional fossil. In a typical modern flatfish, the head is asymmetric, with … See more WebDec 5, 2016 · Flatfish are some of the most unusual vertebrate animals on our planet. They start out their life fully symmetrical, like any other fish, but undergo a spectacular … WebThe flatfish species constitute a natural paradigm for investigating adaptive changes in the vertebrate central nervous system. During metamorphosis all species of flatfish … meriwether package store luthersville ga