Planche 1 issued from : T. Scott in Rep. Fishery Bd Scotl., 1904, 12 (3). [Pl. XIV, fig.5]. As Thaumaleus rostratus. Female (from Lerwick Harbour, Shetlad): 5, habitus (dorsal).
Nota : 1st cephalothoracic segment moderately stout, tapering gradually in front into a blunt pointed rostrum, while posteriorly the body becomes gradually narrower towards the distal extremity.
Planche 2 issued from : T. Scott in Rep. Fishery Bd Scotl., 1904, 12 (3). [Pl. XIV, figs.6-8]. As Thaumaleus rostratus. Female: 6, A1; 7, P5; 8, abdomen and caudal rami. Abdomen 3-segmented ; 1st segment as large as the next two together, but the 2nd very small. caudal rami each with 3 setae of moderate lengths A1 short and moderately stout, 4-segmented and sparingly setiferous ; 1st and 3rd segments small, 2nd about one and a half times the length of the 3rd, while the last equal to the entire length of the other’ 3 segments. P5 short and foliaceous, and each terminates in two unequal lobes ; the outer lobe, which is narrower than the inner and projects somewhat beyond it, furnished with 3 moderately long setae ; the inner lobe broadly rounded and provided with a single seta.
Isaac (1975) suggère que Thaumaleus similirostratus pourrait être le mâle de cette espèce. Grygier & Suarez-Morales, 2018 (p499) suggèrent que cette espèce (connue uniquement par une femelle) est la même que celle décrite par Isaac (1974) comme Thaumaleus similirostratus (= Cymbasoma similirostratum) male. Pour des raisons de nomenclature (ICZN) les deux formes seraient synonymes, mais la priorité de l'appellation reviendrait à Isaac (1974).
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