Polychaetes inhabiting deep-sea soft bottoms from the southeastern Gulf of California were collected during four oceanographic cruises during 2000 and 2001. Sampling of benthic organisms was performed with a benthic sledge to collect epifauna and a Karling dredge for epifauna and infauna, in a depth range from 732 to 2 250 m. A list of the polychaetes that were collected and their distribution ...

Fauna Europaea provides a public web-service with an index of scientific names (including important synonyms) of all living European land and freshwater animals, their geographical distribution at country level (up to the Urals, excluding the Caucasus region), and some additional information. The Fauna Europaea project covers about 230,000 taxonomic names, including 130,000 accepted species and...

In Annelida, as well as in other invertebrate taxa, the nervous system is considered to be a very conservative organ system. Immunohistochemical investigations [use of anti-5-HT (serotonin), FMRFamide, and acetylated α-tubulin antibodies] in combination with laser scanning microscopy enable more detailed reanalyses of known structures and detection of new characteristics that are useful for phy...

A body wall musculature comprising an outer layer of circular fibers and an inner layer of longitudinal fibers is generally seen as the basic plan in Annelida. Additional muscles may be present such as oblique, parapodial, chaetal, and dorsoventral muscles. The longitudinal muscle fibers do not form a continuous layer but are arranged in distinct bands in polychaetes. Mostly there are four to s...

We report the presence of Mesorhizobium, a genus best known for its nitrogen-fixing symbiosis with terrestrial legumes, associated with the marine polychaete Meganerilla bactericola (Annelida: Nerillidae). Abundant epibionts were previously described as coating the exterior of M. bactericola, which is found within the anoxic sulfide-oxidizing microbial mats of the Santa Barbara Basin, Californi...