Pachyscyllium dachiardii ( Lawley, 1876 )

Pachyscyllium dachiardii ( Lawley, 1876)

Plate 2, Figs 14–19

* Scyllium d’Achardii Lawley, 1876: 36 View in CoL .

Catulus ( Scyllium) aff. minutissimus (Winkler) — Zbyszewski & Almeida 1950: 348, pl. 7, figs 124–126.

Catulus View in CoL af. minutissimus (Winkler) — Serralheiro 1954: 66, pl. 2, figs 54–57.

Scyliorhinus distans ( Probst, 1879) — Antunes & Jonet 1970: 158, pl. 10, figs 46–52.

Scyliorhinus dachardii ( Lawley, 1876) — Landini 1977: 111, pl. 5, fig. 14.

Premontreia ( Oxyscyllium) cf. dachiardi ( Lawley, 1876) — Balbino 1995: 68, pl. 8, figs 1–7.

Premontreia ( Oxyscyllium) cf. dachiardi ( Lawley, 1876) — Antunes & Balbino 2004: 77, figs 3h–m.

Premontreia ( Oxyscyllium) dachiardi ( Lawley, 1876) — Reinecke & Wienrich 2009: 977, 978, pl. 138, fig. 1.

Premontreia ( Oxyscyllium) dachiardi ( Lawley, 1876) — Reinecke et al. 2011: 50, pl. 54, 55.

Premontreia ( Oxyscyllium) dachiardi ( Lawley, 1876) — Cappetta 2012: 267.

Pachyscyllium dachiardii ( Lawley, 1876) — Schultz 2013: 94, pl. 10, figs 14a, b, 15a, b ( cum syn.).

Pachyscyllium dachiardii ( Lawley, 1876) — Fialho et al. 2021: 412, figs 4g –m.

Pachyscyllium dachiardii ( Lawley, 1876) — Fialho 2022: 109, pl. 3, figs A–D.

Material. 20 isolated teeth. NHMW 2025 View Materials /0177/0021 ( 5 specimens) .

Description. The teeth ( Pl. 2, figs 14–19) possess a triangularly shaped principal cusp that is approximately twice to three times as high as its base and flanked by a pair of cusplets. The lingual surface of the principal cusp ( Pl. 2, figs 14a, 15a, 16a, 17a, 18a, 19a) is strongly convex and smooth. The labial surface ( Pl. 4, figs 14b, 15b, 16b, 17b, 18b, 19b) is less convex and smooth. The principal cusp of lateral teeth becomes distally inclined. The root is divided into two root lobes by a deep central groove that diverge at an angle of approximately 90°, of which the center is strongly protruding lingually.

Discussion. This species was often attributed to the genus and subgeneus Premontreia ( Oxyscyllium) . However, a case for attributing this species to Pachyscyllium was made by Fialho et al. (2021), which is followed here.

Distribution. Miocene to Lower Pliocene. Lower Miocene: North Sea (Capetta 1987); Lower-Middle Miocene: Atlantic frontage of France ( Aquitaine Basin, Cappetta 1987) and Paratethys, ( Austria, Schultz 2013); Upper Miocene: western Proto-Mediterranean, ( France, Cappetta 1987). Lower Pliocene: Mediterranean ( Italy, Cappetta 1970).

Distribution in Portugal. Middle Miocene: (Langhian) Lower Tagus Basin ( Serralheiro 1954; Fialho et al. 2021). Upper Miocene: (Tortonian) Lower Tagus Basin, Portugal ( Serralheiro 1954), Algarve Basin, Cacela Fm. (this paper); (Messinian) Alvalade Basin, Esbarrondadoiro Fm. ( Balbino 1995; Antunes et al. 1999a, Antunes & Balbino 2004).