Sentences with word «annelid»

One distinction to note is that the nerve bundle is dorsal in zebrafish and ventral in annelids.

A team of Japanese scientists has discovered a new species of polychaete, a type of marine annelid worm, 9 - meters deep underwater near Japan's Syowa Station in Antarctica, providing a good opportunity to study how animals adapt to extreme environments.

Using scanning electron microscopy, researchers found a «network of interwoven cables,» nestled within the wall of a cocoon, which they later determined was the rare preservation of clitellate annelid spermatozoa (pictured above), they report today in Biology Letters.

Osedax, commonly known as bone - eating worms, are marine annelid worms that are an important example of evolutionary adaptation to a specialised habitat: the bones of vertebrates sunk in the sea.

We thus investigated expression of seven transcription factors (brachyury, foxA, foxD, twist, not, soxD, and soxE), the signaling molecules noggin and hedgehog [chordin appears absent from annelid genomes (8)-RSB-, and the guidance factors netrin and slit (table S2 for references).

We focused our search on the model annelid Platynereis dumerilii, which is amenable to molecular studies and has retained more ancestral features than Drosophila melanogaster or Caenorhabditis elegans (4).

We next examined whether an axochord is also present in other annelids, lophotrochozoans, or protostomes (Fig. 1C).

Molecular architecture of annelid nerve cord supports common origin of nervous system centralization in Bilateria.

Mollusks were followed by annelids (segmented worms), cnidarians (including sea anemones), bryozoans (moss animals that sometimes resemble coral), crustaceans and others.

Learning is now known to be well within the capacity of many annelids, mollusks, and anthropods (AT 173 - 76).

Hospitals around the world use the bloodsucking annelids — which have three jaws, each bearing 100 tiny teeth — for tasks such as stimulating circulation after the surgical reattachment of a severed finger or ear.

Our study of annelid development reveals a population of mesodermal cells that converge and extend along the ventral midline and express a combination of transcription factors, signaling molecules, and guidance factors that closely matches that of the vertebrate chordamesoderm.

It is unlikely that the molecular similarity between annelid and vertebrate mesodermal midline is due to independent co-option of a conserved gene cassette, because this would require either that this cassette was active elsewhere in the body (which is not the case) or that multiple identical independent events of co-option occurred (which is unparsimonious).

This is not so for annelids.

K. K. Dill, K. Thamm, E. C. Seaver, Characterization of twist and snail gene expression during mesoderm and nervous system development in the polychaete annelid Capitella sp..

It causes a gradual deterioration of the kidneys.Eggs from this parasite are passed through the urine and eaten by aquatic annelids.

Like many war games featuring crazily outfitted robots, furry woodland critters or slimy annelids, the humor is easily half the fun.

While blowing up annelids with old ladies and crushing limbless grubs with concrete donkeys, has it crossed your mind that you'd like to enjoy Worms ™ Revolution with more weapons, new puzzle missions, and even more additional content all with a funfair theme?

As with other lists, crustaceans, mollusks, and annelids contributed high numbers of species, and more species remain to be found.

Arthropod and annelid relationships re-examined.

The fossilized cells, reported today as the oldest animal sperm ever collected, belong to a class of cocoon - producing worms called clitellate annelids, more commonly known as earthworms, leeches, and their relatives.

She calls her show «Anemine» # 8212; and, just, for the record, that means a green substance distilled from annelids, or worms, that covers the Amazon.

We identify a population of mesodermal cells in a developing invertebrate, the marine annelid Platynereis dumerilii, that converges and extends toward the midline and expresses a notochord - specific combination of genes.

Note that there is a similar structure to the other annelids.

7 - day - old Enchytraeus coronatus (annelid worm) embryo (250x) Confocal microscopy Annette Bergter Department of Zoology University of Osnabruck Osnabruck, Germany

One such example is Capitella teleta, which belongs to the second big clade of annelids, the Sedentaria (beside Errantia, to which Platynereis belongs).

No - tilled fields often have more beneficial insects and annelids, [29] a higher microbial content, and a greater amount of soil organic material.

It is worth remembering that the UB and IRBio team led by Conxita Àvila has contributed to the discovery of the first Osedax bone - eating worm in the Antarctic continent and the Mediterranean, the nemertean Antarctonemertes riesgoae, which has a bizarre reproductive behaviour, and the annelid Parougia diapason, a new species discovered in Deception Island, among others, in the South Shetland Islands in the Southern Ocean.

These annelid predators live beneath the sandy ocean floors of the Indo - Pacific and can reach up to three meters in length.

The annelid buries itself in the sand up to its head and lies in wait for its prey, luring it in with worm - shaped tentacles.

The authors say high - resolution confirmation of the fossil would not only allow a peak into the evolutionary history of clitellate annelids, it would blow the door wide open.

The annelids, collectively called Annelida are a large phylum of animals, comprising the segmented worms, with about 15,000 modern species including the well - known earthworms and leeches.

As a part of this process, they conducted microscopic analyses to examine two annelid worms that scuba divers collected 8 - 9 meters deep on January 16th, 1981, at Nishinoura near Syowa Station.

The origin and evolution of clitellate annelids — earthworms, leeches and their relatives — is poorly understood, partly because body fossils of these delicate organisms are exceedingly rare.

The non-BMP body side will be dorsal (d) in vertebrate and ventral (v) in annelid, reflecting inversion of body posture in early chordate evolution (35).

In annelids, these cells differentiate into an axochord; our investigation of chaetognath musculature and an ancestral state reconstruction based on comparative anatomy (fig.

A and B are cross-sectional representations of midline development in zebrafish (A) and annelid (B).

This is a phalloidin stain in another species of annelid, Owenia.

We next compared the developmental fate of annelid and vertebrate mesodermal midline cells.

However, unlike in chicken (10), the annelid mesodermal and ectodermal midline populations are not directly related by lineage (fig.

Phalloidin stainings had revealed ventral midline muscles in almost all annelid families (table S3), yet in some cases only pairs of ventral muscles had been reported (18, 19).

«Tracing the cellular origins of germline formation and regeneration in the annelids.»

17 pages.I know About Animals Animal Classification Flip Book has Characteristics and examples worksheets for the below Animal Classifications: Vertebrates - birds, fishes, amphibians, mammals, reptiles Invertebrates - insects, annelids, mollusk, arthropods, protozoa, crustaceans, arachnids, echinoderms.

An annelid is a worm, in case you didn't know either.