On the basis of the vesicular structure of the shell wall, Fisher felt that they were not closely related to annelid worms. |
|
These differences in expression domains indicate changes in the regulation of these genes somewhere in the annelid lineage. |
|
When present, the annelid peritoneum either rests directly on the muscle cells or is separated from them by a layer of extracellular matrix. |
|
If reptiles could develop into birds then annelid worms could develop into insects. |
|
Then the waste exits out of the nephridiopore as dilute urine, balancing osmotic intake of fresh water surrounding the annelid. |
|
Many polychaetes hatch into a particular type of planktonic larva, the trochophore, which later metamorphoses into a juvenile annelid. |
|
It is clear that two different hydrophobic motifs are conserved in annelid species. |
|
They seem to eat more annelid worms and insects than any other prey, and chicks are fed mostly earthworms. |
|
The insectan nervous system evolved from the segmented system of annelid worms, such as the earthworm. |
|
The project is using arthropods and annelid worms as an example of how to investigate this question. |
|
Scolecodonts are the isolated jaws of polychaete annelid worms. |
|
Similar processes, which occur in the development of other animals, establish the basic organization of an annelid, a mollusk, or an arthropod. |
|
The movements of most other annelid worms are also controlled by a hydrostatic skeleton. |
|
Marine worms from the annelid superfamily are also well represented with 400 catalogued specimens. |
|
Some of the micromeres become arranged in a characteristic pattern known as the annelid cross. |
|
The four cells of the annelid cross frequently give rise to a so-called apical tuft of cilia at the anterior end. |
|
Another conspicuous feature of this annelid is the red bush-like gills that also extend from its head. 15-20 cm. |
|
The most common worms are segmented annelid polychaetes, and slender nemerteans, or round worms. |
|
These genomes have remarkably similar gene orders to previously published annelid genomes, suggesting that gene order is conserved across annelids. |
|
Thus some shallow water marine annelid worms contain considerable quantities of porphyrins in their tissues, but are tubicolous or burrowing in habit. |
|
|
Scolecodonts are the partly organic, fossil remains of the jaw apparatus, a tooth-like structure, of eunicid polychaete annelid worms. |
|
Rare fossils include an annelid worm, two crabs, a spiny lobster, a ratfish, a ray, unidentified bony fishes, and reptiles reported here. |
|
As soft-bodied animals, annelid fossils are exceedingly rare. |
|
All 4 of these compounds had juvenile hormone activity, inducing metamorphosis in larvae of the annelid Capitella. |
|
The other members of the Lophotrochozoa are the annelid worms and seven marine phyla. |
|
For many years arthropods and annelids were believed to be closely related, with arthropods likely evolving from annelid ancestors, or vice versa. |
|
Segments occur in other animals, including annelid worms and arthropods, but these segments have a different composition and probably a separate evolutionary origin. |
|
Bookworm: Vanilla with gummy worms and annelid chunks. |
|
Invertebrate paleontology deals with fossils of invertebrates such as molluscs, arthropods, annelid worms and echinoderms. |
|
Ortonia, a new genus of fossil tubicolar Annelides.a new tubicolar Annelid from the Silurian of Bohemia. |
|