Depressiscala nautlae ( Mörch, 1875 ) Scala nautlae Mörch, 1875: 265 Scala scipio Dall, 1889: 27 Epitonium (Depressiscala) nautlae Abbott, 1974: 122 Rios,1975:56 Depressiscala nautlae Rosenberg et al., 2009: 641 New species, misidentifications and problematic taxonomy of some Atlantic South American marine mollusks: a review Simone, Luiz Ricardo L. Papéis Avulsos de Zoologia 2024 2024-08-09 64 1 104     Depressiscala nautlae( Mörch, 1875)( Fig. 7A-F)     Scala nautlae Mörch, 1875: 265.     Scala scipio Dall, 1889: 27, 310.  Epitonium (Depressiscala) nautlae:  Abbott, 1974: 122(fig.1271);  Rios,1975:56(pl.15,fig.217),1994:157(pl.52, fig.743), 1994:99 (pl. 32,fig. 400),2009:181 (fig.439).    Depressiscala nautlae:  Rosenberg et al.,2009: 641.    Typelocalities:  S.nautlae:ad litus mexicanum inter Vera Cruz et Nautla.  Scala scipio:Vera Cruz; sta. 2597, 20 milesSW by S from CapeHattenas, N.C., 15 + 12 fms.   Remarks:Specimens found on the Brazilian coast with the shell characteristics shown in Fig. 7A-C were identified as both  D. nautlaeand  D. niditella( Dall, 1889). A comparison to the lectotypeof  D. nitidella(USNM 83716) ( Fig. 7G) reveals that they do not belong to that species, as the shells are much slenderer and lack an umbilicus. Conversely, their shells are virtually identical to the lectotypeof  Scala scipio( Fig. 7D, E), a species presently considered synonymous with  D. nautlae. The issue arises from the apparent existence of two different morphs under this epithet. One resembles the  S. scipiomodel, with a deeper suture, more distant and narrower axial threads, and always with an amputated apex ( Fig. 7A-E). The other morph, illustrated in Fig. 7F, features a shallower suture, taller and more closely locat- ed axial threads, and a complete apex. This latter morph is illustrated, for example, in Abbott (1974). Upon analyzing these specimens, the most parsimonious conclusion is that they belong to different species. However, it is important to determine whether the typesof Mörch (1875)resemble them, as they have not been located or photographed to the best of our knowledge. This is an important issue for future surveys.   Material examined:  USA.  Florida;  Pompano Beach,  52 m, ANSP 457201, 2shells ( Harriet, Robertson& Golbergcol., 2004).  BRAZIL.  São Paulo;  Ubatuba, praia Puruba, 23°21′09.2″S 44°55′54.3″W, MZSP 166500, 1shell, 165694, 7 shells ( D. Forcellicol.,  viii.2023). Plus11 lots of MZSPcollection from Piauíto São Paulo. [1048,1200,1274,1299] Florida United States of America USA 11 12 1 ANSP Pompano Beach & Harriet & Robertson & Golberg United States of America 52 12 13 11 12 ANSP 457201, 2 1 [358,569,218,243] Brazil Sao Paulo 12 13 1 Sao Paulo 2023-08 MZSP Ubatuba & D. Forcelli & Plus Brazil -23.352556 Piaui 1 -44.93175 12 13 MZSP 166500, 1 1 Piaui