Sergestes robustus Smith, 1882: 97, pl. 16, figs. 5–8.
Material examined. None.
Distribution. Western Atlantic— Canada (New Scotia), Bermuda, USA (Massachusetts), Gulf of Mexico, Caribbean Sea, Suriname, French Guiana, Brazil (São Pedro and São Paulo Archipelago, São Paulo, Rio Grande do Sul), and Uruguay. Eastern Atlantic— Norway, Denmark, Faroe Islands, Scotland, Ireland, Azores, Canary Islands, Cape Verde Islands, Madeira Islands, Mediterranean Sea, Greece, Congo, Angola, and South Africa (Holthuis 1952b; D’Incao 1995a; Pérez Farfante & Kinsley 1997; Vereshchaka 2000; Cardoso et al. 2014; Judkins 2014; Araújo & Wirtz 2015; Kondylatos et al. 2020; Timm et al. 2020).
Remarks. The coordinates of previous records from the coast of São Paulo refers to Sergia robustus and are 24°16’S / 44°00’W, which is close to Ubatuba (D’Incao 1995a). This species was first described as Sergestes robustus (Smith, 1882), and reclassified as Sergia robusta afterward (Vereshchaka 2000; De Grave & Fransen 2011). Vereshchaka et al. (2014) describes a new genus Robustosergia Vereshchaka, Olesen & Lunina, 2014 including the four species of S. robusta species complex (S. robusta, S. regalis, S. extenuata, S. vityazi). We did not collect this species, since it is known to occur at depths of 200 and 5,000 m (D’Incao 1995a), predominantly between 600 and 1,000 m (Timm et al. 2020); they are sampled with demersal and pelagic trawls (Cardoso et al. 2014). We did not reach such depths or use such collecting gear. There is a COI sequence (JSDPX79-05 = JQ306179) available on GenBank by Matzen da Silva et al. (2011).