[2] Molecular phylogenetic analysis suggests that Pectinereis strickrotti is most closely related to Alitta, Nectoneanthes, and Nereis.

[3] Most nereidids perform oxygen exchange in branchiae; however, Pectinereis strickrotti possesses more elaborate gills.

[4] The internal acicula are also unique; some of them in the rear parapodia are very stout, slightly curved, have a blunt end, and extend beyond the parapodial surface.

They were found swimming near a methane seep off the Pacific coast of Costa Rica at a depth of around 1,000 meters.

[7] This habitat is unusual, as other related nereid worms are not found in the deep sea, but in shallow waters.