✦ LIBER ✦

Evolution of gastrulation in the ray-finned (actinopterygian) fishes

✍ Scribed by Mark S. Cooper; Valerie C. Virta

Publisher: John Wiley and Sons
Year: 2007
Tongue: English
Weight: 825 KB
Volume: 308B
Category: Article
ISSN: 1552-5007
DOI: 10.1002/jez.b.21142

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

Sometime before or during the early Mesozoic era, new lineages of actinopterygian (ray‐finned) fishes radically transformed their mode of gastrulation. During this evolutionary transformation, yolky endoderm was a hotspot for ontogenetic change. As holoblastic cleavage patterns were modified into meroblastic cleavage patterns, major changes in cell identity specification occurred within the mesendodermal marginal zone, as well as in the superficial epithelium of the embryo. These cellular identity changes resulted in the appearance of two novel extra‐embryonic tissues within the embryos of teleostean fishes: the enveloping layer (EVL) and the yolk syncytial layer (YSL). The generation of these extra‐embryonic tissues prompted major morphogenetic changes within the Organizer Region. As these evolutionary changes occurred, the outermost cell layer of the Organizer (the Organizer Epithelium) was apparently retained as a signaling center necessary for the establishment of left–right embryonic asymmetry in the embryo. Conserved and derived features of Organizer morphogenesis and gastrulation within ancient lineages of ray‐finned fishes provide important insights into how the genetically encoded cell behaviors of early morphogenesis can be altered during the course of evolution. In particular, a highly divergent form of actinopterygian gastrulation, which is found in the annual fishes of South America, demonstrates that no aspect of vertebrate gastrulation is inherently immutable to evolutionary change. J. Exp. Zool. (Mol. Dev. Evol.) 308B:591–608, 2007. © 2007 Wiley‐Liss, Inc.

📜 SIMILAR VOLUMES

Evolution of median fin modules in the a

Evolution of median fin modules in the axial skeleton of fishes

✍ Mabee, Paula M. ;Crotwell, Patricia L. ;Bird, Nathan C. ;Burke, Ann C. 📂 Article 📅 2002 🏛 John Wiley and Sons 🌐 English ⚖ 420 KB 👁 1 views

Detailed examples of how hierarchical assemblages of modules change over time are few. We found broadly conserved phylogenetic patterns in the directions of development within the median fins of fishes. From these, we identify four modules involved in their positioning and patterning. The evolutiona

Aquatic prey capture in ray-finned fishe

Aquatic prey capture in ray-finned fishes: A century of progress and new directions

✍ Lara A. Ferry-Graham; George V. Lauder 📂 Article 📅 2001 🏛 John Wiley and Sons 🌐 English ⚖ 833 KB

## Abstract The head of ray‐finned fishes is structurally complex and is composed of numerous bony, muscular, and ligamentous elements capable of intricate movement. Nearly two centuries of research have been devoted to understanding the function of this cranial musculoskeletal system during prey c

Effects of Precaudal Elongation on Visce

Effects of Precaudal Elongation on Visceral Topography in a Basal Clade of Ray-Finned Fishes

✍ Andrea B. Ward; Nathan J. Kley 📂 Article 📅 2011 🏛 Wiley (John Wiley & Sons) 🌐 English ⚖ 448 KB

## Abstract Elongate body forms have evolved numerous times independently within Vertebrata. Such body forms have evolved in large part via changes to the vertebral column, either through addition or lengthening of vertebrae. Previous studies have shown that body elongation in fishes has evolved mo

Homology of the paired fins in fishes

✍ A. Brazier Howell 📂 Article 📅 1933 🏛 John Wiley and Sons 🌐 English ⚖ 324 KB 👁 1 views

## Abstract Recent and fossil fishes may be divided into groups having both pectoral and pelvic fins, pectorals only, pelvics only, or with a second pair of fins located anteriorly and seemingly not homologous with pelvics. In some groups the pelvics are located near the cloaca, with an extensive h

Functional implications of variation in

Functional implications of variation in pectoral fin ray morphology between fishes with different patterns of pectoral fin use

✍ Natalia K. Taft 📂 Article 📅 2011 🏛 John Wiley and Sons 🌐 English ⚖ 425 KB

## Abstract In this study, I compare the morphology from the pectoral fin rays from the benthic longhorn sculpin (__Myoxocephalus octodecimspinosus__) to those from a species that does not use its fins for substrate contact, the yellow perch (__Perca flavescens__). I use CT scanning technology to c

Evolution of the upper jaw mechanism in

Evolution of the upper jaw mechanism in teleost fishes

✍ JR Theodore H. Eaton 📂 Article 📅 1935 🏛 John Wiley and Sons 🌐 English ⚖ 865 KB

## Abstract This study reveals the existence of four distinct but genetically related types of upper jaw mechanisms: 1. The non‐protractile, with no mechanism for the protrusion of the pre‐maxillae. The maxillaries form part of the upper margin of the mouth, as in Isospondyli, Apodes and Haplomi.