Stephanelytron ceto Courtinat, 1999, p.179, pl.1, figs.10–12; text-fig.3.
Holotype: Courtinat, 1999, pl.1, fig.11. N.I.A.
Age: latest Callovian–early Oxfordian.

Original description, Courtinat, 1999: Stephanelytron ceto n. sp. (this study), Plate 1, figs 10--12
Holotype. This study, Plate 1, fig. 11.
Dimensions. Length of central body, 34 μm; equatorial diameter of central body, 40 μm; length of processes, 1- 2 μm; R = 0.03- 0.06
Age. Early Oxfordian (Minax zone).
Geographical location. France (Ardeche, Chenier).
Diagnostic elements. (See Tables 2 and 3)
No apical horn present..
Corona: One, smoothwall on ps paraplate; low and straight; thick base; intra corona area smooth without processes
Paratabulation: indicated by archeopyle, paracingulum, and accessory archeopyle suture.
Processes: dense cover of intratabular and penitabular processes. Processes are cylindrical, tubiform to buccinate, non-perforate.
Autophragm: Smooth
Archeopyle/operculum: apical/free
Stratigraphic range. (See Table 4): First appearance: Lamberti Zone (this study). Last appearance: Minax Zone (this study)