We also see in various organs of the rabbit, and especially in the case of the limbs and vertebral column, what is called metameric segmentation, that is, a repetition of parts, one behind the other, along the axis of the body.    From Wordnik.com.  [Text Book of Biology, Part 1: Vertebrata] Reference

Geoffroy's principle of the unity of plan and composition to the three great metameric groups, the Annelida, Arthropoda, and Vertebrata.    From Wordnik.com.  [Form and Function A Contribution to the History of Animal Morphology] Reference

As far as we know, all metameric organisms use the same underlying genetic regulatory mechanism to produce segmented (i.e. metameric) bodies.    From Wordnik.com.  [Ancient Predator Revealed!] Reference

In contrast to flies, which have a clearly segmented ectoderm, the mesoderm is the primary vertebrate tissue that is organized in a metameric pattern.    From Wordnik.com.  [Nobel Lecture The Identification Of Genes Controlling Development In Flies And Fishes] Reference

All we know is that all of the known metameric animals use essentially the same mechanism to regulate the development of their multiple body segments.    From Wordnik.com.  [Ancient Predator Revealed!] Reference

As part of the wider idea of the metameric repetition of parts it had some scientific worth, but the theory was pushed too far, and the facts were twisted to suit it.    From Wordnik.com.  [Form and Function A Contribution to the History of Animal Morphology] Reference

Right and left organs are homotypic, metameric organs are homodynamic; homonomy is the relation exemplified by fin-rays or fingers, which are arranged with reference to.    From Wordnik.com.  [Form and Function A Contribution to the History of Animal Morphology] Reference

Furthermore, this regulatory mechanism almost certainly evolved among organisms that were not metameric, but then became modified later in those descendant lines that became metameric.    From Wordnik.com.  [Ancient Predator Revealed!] Reference

The failure to find mutations resembling the gap and pair rule mutations in the fish may mean that the formation of metameric patterns differs between Drosophila and most other animals.    From Wordnik.com.  [Nobel Lecture The Identification Of Genes Controlling Development In Flies And Fishes] Reference

The earliest metameric pattern, that of the pair rule genes, has 7 stripes that are determined one by one by the action and interaction of a particular combination of gap gene products (32, 33).    From Wordnik.com.  [Nobel Lecture The Identification Of Genes Controlling Development In Flies And Fishes] Reference

In the context of this thread, the homeobox regulatory mechanism of non-metameric ancestral metazoans (such as flatworms) would qualify as an exaptation for the homeobox regulatory mechanism of their metameric descendants.    From Wordnik.com.  [Ancient Predator Revealed!] Reference

In Gould's concept of the term, the original homeobox regulatory mechanism would have evolved first in non-metameric animals, and then become modified later in the dominant metameric forms (i.e. arthropods and vertebrates).    From Wordnik.com.  [Ancient Predator Revealed!] Reference

In the dorsal plates, which early show metameric segmentation, the investing skeleton of the neural axis develops; in the ventral plates are formed the ribs, the ventral arches of the vertebræ, the hyoid, the lower jaw and other skeletal structures.    From Wordnik.com.  [Form and Function A Contribution to the History of Animal Morphology] Reference

If I were a FLID supporter, I would propose that the homeobox regulatory mechanism for body regions was a "front-loaded design element" that, once it was in place, could be modified extensively via standard evolutionary mechanisms to produce the various metameric metazoan bauplans.    From Wordnik.com.  [Ancient Predator Revealed!] Reference

Amphioxus, he thinks, is not a Vertebrate, and Ascidians, though sharing with Annelids the possession of a notochord, gill-slits, and a "dorsal" nervous system, yet are further removed from Vertebrates than the latter by reason of their lacking that essential characteristic of Vertebrates, metameric segmentation.    From Wordnik.com.  [Form and Function A Contribution to the History of Animal Morphology] Reference

Having established this primary principle, Semper has little difficulty in showing that the main organs of the body lie to one another in the same relative positions in Annelida, Arthropoda, and Vertebrata; and this, together with the metameric segmentation common to them all, constitutes his first great argument in favour of their genetic relationship.    From Wordnik.com.  [Form and Function A Contribution to the History of Animal Morphology] Reference

What are bilateral symmetry and metameric segmentation?.    From Wordnik.com.  [Text Book of Biology, Part 1: Vertebrata] Reference

Oh, howzabout hox genes, and segment duplication in metameric organisms?.    From Wordnik.com.  [Pharyngula] Reference

In other words, in these lower vertebrata, the vertebral axis is not metameric.    From Wordnik.com.  [Text Book of Biology, Part 1: Vertebrata] Reference

If the student wants a perfect figure of metameric segmentation he should think of a train of precisely similar carriages, or a string of beads.    From Wordnik.com.  [Text Book of Biology, Part 1: Vertebrata] Reference

This is not quite the same issue as the gloss problem, although metameric failure can be noticed just by changing the angle of view of a print, too.    From Wordnik.com.  [Imaging Resource What's New] Reference

In contrast to metameric segmentation is the antimeric repetition of radial symmetry (Section 142), in which each ray of the star is called an antimere.    From Wordnik.com.  [Text Book of Biology, Part 1: Vertebrata] Reference

But the metameric segmentation in the rabbit's organism is not nearly so marked as that of an earthworm, for instance, which is visibly a chain of rings.    From Wordnik.com.  [Text Book of Biology, Part 1: Vertebrata] Reference

In addition, metameric failure (commonly called simply metamerism) is the phenomenon of a color appearing differently when viewed under different light sources.    From Wordnik.com.  [Imaging Resource What's New] Reference

Pigment printing itself has improved, diminishing the effect of bronzing and metameric failure, while maintaining the stout display properties for which it is prized.    From Wordnik.com.  [Imaging Resource What's New] Reference

The renal organ of the rabbit, some time before birth, displays a metameric arrangement of its parts; but this disappears, as development proceeds, into the compact kidney of the adult.    From Wordnik.com.  [Text Book of Biology, Part 1: Vertebrata] Reference

But as certainly as we have no such metameric segmentation, as this older view implies, in the brain-case of the frog, so quite as certainly is metameric segmentation evident in its branchial arches.    From Wordnik.com.  [Text Book of Biology, Part 1: Vertebrata] Reference

It is possible to have bilateral symmetry without a metameric arrangement of parts, as in the mussel and the cuttle-fish; but metameric segmentation without complete or reduced bilateral symmetry does not occur.    From Wordnik.com.  [Text Book of Biology, Part 1: Vertebrata] Reference

These are thick-bodied sinuous creatures distinguished by the curious conformation of the mouth and by a lateral row of dots that may represent the metameric spiracles or, as commonly, a demarcation between dorsal and ventral surfaces.    From Wordnik.com.  [Animal Figures in the Maya Codices] Reference

We are now in a position to appreciate the fact that the old and more popularly know division of animals into vertebrata and invertebrata scarcely represents the facts of the case, that the primary division should be into protozoa and metazoa, and that the vertebrata are one of several groups of metazoa with a fundamental bilateral symmetry and imperfect metameric segmentation.    From Wordnik.com.  [Text Book of Biology, Part 1: Vertebrata] Reference

September 29, 2009 11:59 AM metameric said.    From Wordnik.com.  [FYI: DIY RPCube PDQ] Reference

(With metameric segmentation.    From Wordnik.com.  [Form and Function A Contribution to the History of Animal Morphology] Reference