Tag Archives: Polychaeta

Evolutionary relationship of Sphaerodoridae

Small grown species with spherical protrusions, called macrotubercles, on their back are the most characteristic features of the polychaete family Sphaerodoridae. A small group of polychaetes with about 110 species in 10 genera. With an overall aim to study evolutionary relationships of the group, we first started to study relationships within the family, but also its position within the polychaete group Phyllodocida. Continue reading Evolutionary relationship of Sphaerodoridae

Sphaerodorid polychaetes from Australia

SEM photo of Sphaerodoropsis exmouthensis . Source Capa & Bakken 2015.
SEM photo of Sphaerodoropsis exmouthensis. Source Capa & Bakken 2015.

Sphaerodoridae is a group of small polychaetes that rarely exceeds 5 mm long. They have often been overlooked in samples when samples are sieved, they simply go through the sieve mesh. In Australia this group has been poorly known. In order to shed more light on the group we examined available museum material representing samples from around the Australian coast. Four new species was described, and three species formally re-described. After our revision the diversity of Sphaerodoridae in Australian waters are 10 species. Continue reading Sphaerodorid polychaetes from Australia

A new polychaete from the Norwegian Sea

Pseudoscalibregma parvum. Photo: Katrine Kongshavn/University Museum of Bergen.
Pseudoscalibregma parvum. Photo: Katrine Kongshavn/University Museum of Bergen.

Knowledge of the biological diversity in the Norwegian Sea is limited. As a result new knowledge on distribution and abundance of benthic species are revealed as more studies are done. We have described a new species of polychaete, Scalibregma hanseni, based on newly available material. In addition a redescription of Pseudoscalibregma parvum is provided, as well as new knowledge on distribution of known scalibregmatids in the Nordic Seas. Continue reading A new polychaete from the Norwegian Sea

Benthic diversity in the deep Norwegian Sea

The diversity of benthic organisms in the Norwegian Sea is higher than previously known. Ongoing projects reveal species and new knowledge. The first expedition set to explore deep sea diversity in this area was the “Norwegian North Atlantic Expedition 1876-1878”. This expedition was one of the first exploring deep sea diversity in the world. Not until the 1980’s new expeditions aimed at studying the benthic diversity. This is continued with the ongoing MAREANO programme. Polychaete worms from these expeditions are now studied to examine deep sea diversity as such, but also differences in diversity from shelf, slope and deep sea areas. Continue reading Benthic diversity in the deep Norwegian Sea

Field trip to Mallorca

Collecting in different habitats provide the opportunity to obtain different species, usually. This is an important aspect in the study of evolutionary development and biogeographic distribution of species in the group of interest. To help in this we set off to Mallorca to sample species of polychaete families Sphaerodoridae and Oweniidae. Continue reading Field trip to Mallorca