A morphological review of the jellyfish genus Nausithoe Kölliker, 1853 (Nausithoideae, Coronatae, Scyphozoa, Cnidaria) Author Molinari, Clarissa G. Departamento de Zoologia, Instituto Biociências, Universidade de São Paulo, Rua do Matão, travessa 14, n. 101, Cidade Universitária, São Paulo, SP, 05508 - 090, Brazil & School of Environment and Science, Gold Coast Campus, Griffith University, Southport, QLD 4222, Australia Author Collins, Allen G. National Systematics Laboratory, Office of Science and Technology, NOAA National Marine Fisheries Service, MRC- 153, Washington, DC 20013 - 7012, USA & Department of Invertebrate Zoology, Smithsonian National Museum of Natural History, MRC- 163, Washington, DC 20013 - 7012, USA Author Morandini, André C. Departamento de Zoologia, Instituto Biociências, Universidade de São Paulo, Rua do Matão, travessa 14, n. 101, Cidade Universitária, São Paulo, SP, 05508 - 090, Brazil & Centro de Biologia Marinha, Universidade de São Paulo, Rodovia Manuel Hypólito do Rego km 131.5, São Sebastião, SP, 11612 - 109, Brazil text Zootaxa 2023 2023-08-21 5336 1 1 32 http://dx.doi.org/10.11646/zootaxa.5336.1.1 journal article 10.11646/zootaxa.5336.1.1 1175-5326 8268440 98F89833-1EBB-41A6-B943-2091F2296D40 Nausithoe simplex ( Kirkpatrick, 1890 ) ( Fig. 15 : A–B) Stephanoscyphus simplex Kirkpatrick, 1890: 14 , pl. III. Stephanoscyphistoma simplex — Jarms, 1990: 11 . Nausithoe simplex — Morandini & Jarms, 2012: 62–63 , figs 1–4. Lectotype NHM 1878.3.26.11a. Material examined: NHM 1878.3.26.11a, b, d. Diagnosis: polyp—solitary with 1 whorl of 4 cusps. Description: Based on original description, and Morandini & Jarms (2012) . Only known from the polyp stage. Polyp 4.56 mm in total length; a single series with 4 internal quadratic cusps. Type locality: S of Greenland ( 56°11’N 37°41’W ), ~ 2650m depth . Distribution: Only known from type locality. Remarks: The precise identification of this species demands visualization of the internal cusps (shape and number). We analyzed one specimen previously identified as N. simplex ( NMNH 53831— North Carolina / USA 1966), but observation of the internal cusps to confirm the identification was not possible without damaging the specimen.