Sandmason Worm Or Sand Mason Worm

Prostomium compact. Branchiae, 3 pairs present on segments 2,3 and 4, branchiae branched. Lateral lobes present on peristomium and segment 3. Notopodia present from segment 4, 17 pairs, notosetae smooth-tipped capillaries. Neuropodia from segment 5 (setiger 2), initially uncini arranged in single rows, subsequently arranged back to back in posterior thorax. Neurosetae avicular uncini. Tube with or without branched fine-meshed fan attached to opening.

Original diagnosis by Malmgren (1866: 379-380): "Corpus antice subcylindricum, postice attenuatum. Segmentum buccale antice productum labium magnum fingens, infra et lateraliter lobum cephalicum amplectens. Segmentum tertium lobulo magno verticali utrinque limbatum. Puncta ocularia nulla conspicua. Branchiae paria 3, ramosae arborescentes, stipite breve, ramis elongatis, ramulis brevissimis filiformibus dense obsitis, postice altitudine decrescentes, dorso segmenti secundi tertii et quarti adnatae. Fasciculi setarum capillarium, a segmento quarto, h. e. tertio branchifero, incipientes in 17 segmentis. Setae capillares limbatae, breves, limbo striato. Tori uncinigeri a segmento secundo setigero usque ad postremum corporis obvii. Uncini breves aviculares, vertice bidentato, uniseriales, in segmento septimo uncinigere et novem sequentibus autem biseriales. Scuta ventralia contigua."

Known from seamounts and knolls