The complete mitochondrial genomes of Notomastus sp. (15,776 bp) (Annelida: Capitellidae) and Armandia sp. (18,538 bp) (Annelida: Opheliidae) were assembled for the first time. A group II intron (303 bp) was found in cox1 of Notomastus sp. A phylogenetic

In this paper we review the systematics, diversity, and ecology of two related annelid families: Opheliidae Malmgren, 1867 and Scalibregmatidae Malmgren, 1867. Opheliids are deposit-feeders and that are mainly found as burrowers in sandy sediments. Morphologically,

The photoreceptors of juvenile, interstitially living Ophelia rathkei, which were collected from sand samples of an exposed beach at the isle of Sylt, are investigated ultrastructurally. The animals have three pigmented photorecep-tors, two lateral ones