This work seeks morphological criteria for estimating age and hence for demographic population studies. Observations on 6 species of terebellid polychaetes revealed a continuous formation of uncinial plates throughout the individual's life. As the replacement proceeds, the size of uncinial plates increases and the torus bears larger and larger uncinial plates between the area where they appear ...

Some species of Eunice might reach giant size, often being longer than 2m, and they are known from tropical and temperate seas. Despite their large size and recent internet notoriety, there remain some taxonomic problems in large-sized eunicids, especially since original descriptions were brief and type materials are often missing. As a mean to encourage the solution of this situation, we revie...

In the article we presents results of study mollusks and polychaetes remains collected during more than 80 years excavations Yudinovo Eliseevichi 1 Upper Paleolithic settlements (Dnieper region). The sites, located on right bank Sudost’ River 45 km from each other are two large with mammoth bone dwellings. sites belonging to different cultural traditions have been excavated over a area. analysi...

p a twin pregnancy with a complete hydatidiform mole with a coexistent foetus (chmf) is a rare condition that typically results in poor pregnancy outcomes. for patients with refractory vaginal bleeding, termination of pregnancy is more appropriate. however, unified methods for termination remain to be explored. in the present study, we reviewed the termination measures in four cases of twin pre...

Pectinariids are a family of polychaetes commonly found in shallow coastal waters around the world, but their diversity is poorly known along the coasts of Asia. Here we describe Amphictene alata sp. n. (Pectinariidae), based on 15 specimens collected from the coastal waters of Guangdong in the northern South China Sea. This new species can be distinguished from all other 13 described species a...

The hydraulic activities of two arenicolid polychaetes, Abarenicola pacifica and Arenicola marina, result in strikingly similar pressure waveforms. The principal hydraulic activities are defecation, burrowing and feeding/ burrow maintenance. Both the duration and magnitudes of the pressures are very similar. The behavioral periodicities of the two species are also quite similar, although burrow...

The feeding habits of the shortnose guitarfish, Zapteryx brevirostris, were studied based on 382 specimens from the northern São Paulo coast, southeast Brazil. The diet showed a predominance of crustaceans (carideans and amphipods), polychaete annelids, and occasionally small fish, sipunculids, and cephalopods. The diets of males and females were similar; however, differences in the proportion ...

Patterns of change in the structure of bacterial communities monitored by ribosomal intergenic spacer analysis (RISA) in oil contaminated sediments inhabited or not by the marine polychaete Nereis diversicolor were studied during 45 days under laboratory conditions. Results supported by principal component analysis showed a marked response of the bacterial communities to the oil contamination a...