Table 2.

Summary of selected meristic features used to discriminate fossil and living genera of the family Narcinidae. Includes new data from the examined material and data from Fechhelm & McEachran (1984), Rincon (1997), Carvalho et al. (1999, 2002a, b, 2003), Carvalho (2001, 2008), Rincon et al. (2001), Carvalho & Séret (2002), Carvalho & Randall (2003), Menni et al. (2008), Carvalho & White (2016), Last et al. (2016), Froese & Pauly (2017).

Feature	Benthobatis	Diplobatis	Discopyge	Narcine	†Titanonarke
Trunk vertebrae	13–20	23–25	20	15–31	27–30
Precaudal vertebrae	46–73	61–63	58–70	58–77	74–115
Caudal vertebrae	31–46	22–24	?	18–32	23–32
Total vertebrae	96–118	97–112	85–91	100–127	133–155
Rib pairs	4	7–9	8	5–10	8–10
Total pectoral radials	?	31	?	27–41	35–40
Pelvic fin radials	12–13	16–21	?	14–21	19–21
First dorsal fin radials	5–6	6–7	?	6–10	7–9
Second dorsal fin radials	6–7	7–8	?	6–11	6–7
Total caudal fin radials	34–35	33–36	?	39–63	41–42
Upper jaw tooth rows	9–20	14–22	10–20	11–27	12–13
Lower jaw tooth rows	9–22	14–22	10–20	8–30	15–17