New species and records of deep-water Cirratulidae (Polychaeta) from off Northern California

New species of Cirratulidae (Polychaeta) from the northeastern United States

“…For example, nuchal organs of species of Chaetozone observed in this paper are small, circular or oval structures, whereas those of Caulleriella venefica are elongated slits. The four species of Chaetozone treated by Blake (2006) in this volume provide similar observations on nuchal organ structure. Although these observations are too few to draw larger conclusions, the structure and placement of the nuchal organs may prove useful in a phylogenetic analysis of cirratulids.…”

“…The three Chaetozone species reported in this paper suggest that new characters associated with segmentation patterns and branchial distribution, details of posterior spines, and placement and form of the nuchal organs may be important in developing a phylogenetic analysis of the family in general. Some of these issues, especially those dealing with anterior segmentation and branchial distribution, are considered by Blake (2006) in a companion paper in this volume. Chaetal distribution patterns and the nature of the nuchal organs are considered in more detail for the New England species (Table 1).…”

Kirkegaardia (Polychaeta, Cirratulidae), new name for Monticellina Laubier, preoccupied in the Rhabdocoela, together with new records and descriptions of eight previously known and sixteen new species from the Atlantic, Pacific, and Southern Oceans

“…The sediments where the species was collected are composed of fine silt. Throughout the study area the benthic fauna is dominated by a large suite of polychaetes of the families Paraonidae, Spionidae, Cossuridae, and cirratulids of the genus Chaetozone, most of which were described by Blake (2006). Ecology of the site was reported by Blake et al (2009 Description.…”

Redescription of Tharyx killariensis (Southern) from Ireland and description of two new species of Tharyx from the Kattegat, Sweden (Polychaeta, Cirratulidae)

“…Further, the short, geniculate or sigmoid shape of the neuropodial and some notopodial spines of Tharyx species are entirely different from the longer, more numerous and robust spines found in species of Chaetozone. Overall, the spines of Tharyx species are inconspicuous to an observer using a stereomicroscope when compared to the larger conspicuous armature of Chaetozone species (see Blake 2000Blake , 2006Blake , 2015.…”