Favartia (Pygmaepterys) giselae ( Boettger, 1902 )

Kovács, Zoltán, 2018, Muricidae (Neogastropoda) assemblages from the Middle Miocene of the Făget Basin (Romania) in the collection of the Hungarian Natural History Museum, Budapest, Fragmenta Palaeontologica Hungarica 35, pp. 111-142 : 126

Favartia (Pygmaepterys) giselae ( Boettger, 1902)

( Figs 38–41 )

1902 Murex (Muricidea) giselae – BOETTGER, p. 30.

1934 Muricidea giselae Boettger – ZILCH, p. 251, pl. 15, fig. 79.

Material – 9 specimens; Coşteiu: M.60.6948 (3), M.60.10434B–E, M.60. 10460 (2).

Remarks – As P. giselae is a very rare, endemic species, a revised description is provided here. Shell length max. 10.5 mm, protoconch of about 2 smooth, rounded whorls, teleoconch of five whorls. Last whorl 80% of total length of the teleoconch. Ovate aperture, six denticles within the outer lip (ID, D1–D5), three folds on the columella, siphonal canal open and slightly dorsally recurved. Crenulate axial growth lamellae, spiral sculpture of strong primary cords (first whorl: appearance of P1 and P2; last whorl: strong P1–P5). Axial sculpture of 6–7 varices on the last whorl, small P1–5 spinelets on the varices.

The classification of the species is discussed in the literature. I follow VOKES (1994) who underlined the presence of characteristic growth lamellae on the shell surface and assigned giselae to subgenus Pygmaepterys .

Figures

Figs 38–41. Favartia (Pygmaepterys) giselae (Boettger). – Figs 38–39. M.60.6948A, SL 10.2 (6×), apertural and abapertural views. – Figs 40–41. M.60.6948B, SL 9.5 (7×), apertural and abapertural views. – Figs 42–43. Ocinebrina credneri (Hoernes et Auinger), M.68.498C, SL 23 (1.7×), apertural and abapertural views. – Figs 44–45. Ocinebrina dertonensis (Bellardi), M.60.10329, SL 28 (1.6×), apertural and abapertural views. – Figs 46–47. Ocinebrina imbricata (Brocchi), M.60.10197, SL 36 (1.6×), apertural and abapertural views