The completeness of reference libraries is often a limiting factor in the effectiveness biomonitoring using molecular tools. fact that these are built upon Sanger sequencing can create substantial bias due to poor primer fits and unoptimized lab protocols. Some taxa marine macroinvertebrates known be notoriously difficult sequence traditional, PCR-based means, only about 15% bioindicator specie...

Three hundred and thirty two species of polychaetes belonging to 50 families are reported for Costa Rica based on previously published reports. In a few families, available material was re-examined and appropriate changes in species identifications were made. Only three species, (Glycera oxycephala Ehlers, 1887; Hemipodia pustulata (Friedrich 1956); and Scolepis (Scolepis) squamata (Miller, 180...

The ultrastructure of spermatozoa and spermiogenesis in PoZydora neocaeca is described. Most morphological features and measurements of cellular components of the spermatozoa are similar to previously studied members of the genus Polydora. However, early spermatids contain finely granular chromatin which becomes finely tibrillar in late spermatids and uniformly electrondense in mature spermatoz...

Actinosporean stages including spherical pansporocysts and oval tetractinomyxon actinospores about 8 μm long were found in two unidentified spionid polychaetes in the northern Øresund, Denmark. The myxosporean stages in fish are unknown. Members of the Spionidae occur worldwide and at all depths and it is likely that they act as invertebrate hosts for several species of Myxozoa. *Corresponding ...

Spionidae (Polychaeta) collected from seamounts in the Atlantic Ocean were studied. Altogether six species were found of which two are new to science and one belongs to a new genus. Aonidella cf. dayi Maciolek in López-Jamar, 1989 and Glandulospio orestes gen. et sp. nov. were the most common species and occurred on both the Great and Little Meteor Seamount, the Irving Seamount and the Hyeres S...