Streblosoma M. Sars ex G. O. Sars 1872

Reuscher et al. (2011) provide the first record of a species of this genus from deep-sea hydrothermal vents. They include a table with diagnostic characters for all known species of the genus.

Diagnostic characters of the genus are given in the following resources. Fauchald, 1977: p. 133.

Grymaea bairdi Malmgren, 1866

Original diagnosis by M. Sars in G.O. Sars (1872: 413): ''Corpus vermiforme, subteres, postice paulo sensim attenuatum. Lobus cephalicus brevis truncatus, antice tentaculis numerosis elongatis canaliculatis, postice punctis ocularibus nullis. Segmentum buccale, primum, orem subtus circumdans, nudum. Branchiae filiformes dorso segmenti secundi, tertii et qvarti affixae, haud ramosae, utrinqve in serie contigua transversa dispositae. Fasciculi setarum capillarium modo in anteriore corporis parte, in segmentis 28—34 obvii, in segmento secundo (primo branchifero) incipientes, e tuberculis elongatis pinnulaeformibus prodeuntes. Tori uncinigeri in segmento qvinto (i. e. qvarto setigero) incipientes, breves, ovales, pone ultimum segmentum setigerum in pinnulas mutati. Setae capillares leviter curvatae, anguste limbatae, acuminatae. Uncini breves aviculares, vertice uni — vel indistincte bidentato, uniseriales. Scuta ventralia in segmentis anticis conspicua, latissima. Tubus liber, teres, arenulis aut limo obductus, aut irregulariter flexuosus tortusqve aut spiraliter in anfractus regulares convolutus.''