Plagioconus extensus (M. Hörnes, 1851)

Kovács, Z. & Vicián, Z., 2013, Badenian (Middle Miocene) Conoidean (Neogastropoda) fauna from Letkés (N Hungary), Fragmenta Palaeontologica Hungarica 30, pp. 53-100 : 79-81

Plagioconus extensus (Partsch in Hörnes, 1856)

(Figs 97–100)

1856 Conus extensus Partsch – HÖRNES, p. 37, pl. 5, fig. 1.

non 1935 Conus (Leptoconus) extensus Partsch – VENZO, p. 204, pl. 17, fig. 6 [= P.elongatus (Borson) ]. 1956 Conus (Leptoconus) extensus Partsch – CSEPREGHY-MEZNERICS, p. 421, pl. 11, figs 7–8. 1960 Conus (Leptoconus) extensus Partsch – KOJUMDGIEVA, p. 210, pl. 49, fig. 6.

non 1966 Conus (Leptoconus) extensus Partsch – STRAUSZ, pl. 67, figs 11–12 [= P. elongatus (Borson) ].

1981 Conus extensus Partsch – WANK, pl. 1, fig. 2.

1998 Conus (Phasmoconus) extensus Partsch – SCHULTZ, pl. 29, fig. 13.

non 2001 Conus (Leptoconus) extensus Partsch – CHIRA & VOIA, pl. 2, fig. 1 (= P.marii Sacco )

Material – 62 specimens.

Description – Shell large (SL: 38–62). Spire high, outline straight, step-like. Early whorls finely tuberculate. Shoulder rounded. Body whorl narrowly conical, outline straight, smooth with marked, widely spaced grooves on the lower third to mid-height. Aperture narrow. Subsutural flexure asymmetrically curved and deep.

Remarks – The Letkés specimens match the type, but some bear slightly low- er spire with somewhat rounded whorls. The closely allied Plagioconus elongatus (Borson) agrees well in size and general morphology ( PAVIA 1976, BAŁUK 2006); however, it differs in growth of the spire, and in robust shape of the shoulder.

Distribution – (?) Turkey (M), Austria, Bulgaria, Romania (MM), (?) Spain (UM). Hungary: Hont, Letkés, Szob (MM).