Plagioconus,

Harzhauser, Mathias & Landau, Bernard, 2016, A revision of the Neogene Conidae and Conorbidae (Gastropoda) of the Paratethys Sea, Zootaxa 4210 (1), pp. 1-178: 135-136

publication ID

http://doi.org/10.11646/zootaxa.4210.1.1

publication LSID

lsid:zoobank.org:pub:D39416B8-CF85-440B-84C2-D4380BECC4E3

persistent identifier

http://treatment.plazi.org/id/373F87D7-FF19-FF09-FF5F-A8E1FC75400F

treatment provided by

Plazi

scientific name

Plagioconus
status

 

Plagioconus  extensus (Hörnes, 1851) 

Figs 30 K, 32C1–C3, 32D, 32E1–E3

[ Conus  ] extensus  n. sp. — Hauer 1837: 416 (nomen nudum).

Conus extensus Partsch—Hörnes 1851: 37  , pl. 5, figs 1a –c.

Conus (Leptoconus) extensus Partsch—Hoernes & Auinger 1879: 34  .

Conus (Leptoconus) extensus  Partsch—Csepreghy-Meznerics 1956: 421, pl. 11, figs 7–8.

? Conus (Leptoconus) extensus (Partsch in Hörnes 1856)  —Kojumdgieva in Kojumdgieva & Strachimirov 1960: 210, pl. 49, fig. 6.

Conus (Leptoconus) extensus Partsch—Strausz 1966: 453  , pl. 67, figs 11–12.

Conus extensus Partsch—Wank 1981: 285  , pl. 1, fig. 2.

Conus (Phasmoconus) extensus Partsch—Schultz 1989: 72  , pl. 29, fig. 13.

Conus (Chelyconus) puschi Michelotti—Chira & Voia 2001: 156  , pl. 4, figs 1a –b [non Plagioconus  puschi ( Michelotti, 1847)  ].

Plagioconus  extensus (Partsch in Hörnes, 1856)  — Kovács & Vicián 2013: 79, figs 97–100.

Conus extensus Partsch—Fözy & Szente 2014: 311  , text-fig. 5.

non Conus (Leptoconus) extensus Partsch—Chira & Voia 2001: 156  , pl. 2, figs 1a –b [= Plagioconus  marii (Sacco, 1893)  ].

Type material. 2 syntypes NHMW 1847View Materials /0037/0031, Baden ( Austria), including specimen illustrated in Hörnes (1851, pl. 5, fig. 1), middle Miocene , Badenian (late Langhian). 

Studied material. Syntypes and 1 spec. NHMW 1869/0001/0159, 1 spec. NHMW 1997View Materials z0178/0871, Badenian Baden ( Austria); 2 spec  . NHMW 2015/0391/0001 including specimen illustrated in Schultz (1998, pl. 29, fig. 13), 3 spec. NHMW 1872/0030/0017, 10 spec. NHMW 2013View Materials /0300/0525, all Baden-Sooß ( Austria); 1 spec  . NHMW 1855View Materials /0045/0370, Gainfarn ( Austria), 3 spec  . NHMW 1854/00035/0053, 3 spec. NHMW 1854/0035/0052, 2 spec. NHMW 1855/0043/0003, 2 spec. NHMW 1859/0037/0001, 1 spec. NHMW 1868/0001/0384, 2 spec. NHMW 1866/0040/0247, 4 spec. NHMW 1875/0009/0005, 1 spec. NHMW 1875/0009/0004, 2 spec. NHMW 1890/0001/ 0 0 11, 2 spec. NHMW 1890/0001/0013, 2 spec. NHMW 1973/1615/0062, 3 spec. NHMW 2015/0392/0001, 8 spec. NHMW 2015/0392/0002, 2 spec. NHMW 1858View Materials /0043/0004, all Lăpugiu de Sus ( Romania), 1 spec  . NHMW 1867View Materials / 0019/0010, Coşteiu de Sus ( Romania): 1 spec  . NHMW 2015View Materials /0393/0001, Nemeşeşti ( Romania). 

Illustrated material. Figs 32View FIGURE 32 C1–C3: Lăpugiu de Sus ( Romania): SL: 89.3 mm, MD: 35.3 mm, NHMW 1890/ 0001/0011; Figs 32View FIGURE 32 D: Lăpugiu de Sus ( Romania), SL: 89.0, MD: 36.0 mm, NHMW 1859/0037/0001; Figs 30 K, 32E1–E3: Baden-Sooß ( Austria): SL: 96.0 mm, MD: 33.2 mm, NHMW 1872/0030/0017.

Revised description. Large shells comprising at least 10 tall teleoconch whorls; spire short, conical to weakly coeloconoid. Early whorls angular above suture with coarse beads, central angulation becoming mid-whorl inflation abapically. Sutural ramp bearing subsutural collar/band and spiral striae developed to a variable degree; ramp becoming increasingly concave abapically. Suture deeply impressed. Subsutural flexure very deep, moderately curved, strongly asymmetrical. Last whorl very elongate, weakly constricted at base; moderately round shoulder with position of maximum diameter a short distance below shoulder. Aperture narrow, widening abapically. Siphonal canal long, weakly recurved; fasciole elongate, slightly twisted and demarcated from narrow glossy inner lip by a narrow notch. Base covered by very delicate spiral grooves on adapical half; grooves become stronger and wider abapically; usually somewhat irregular and pitted. Colour pattern in UV light consisting of light flammulae on spire whorls and shoulder of last whorl parallel to subsutural flexure; indistinct bands on last whorl.

Shell measurements and ratios. n = 12 adult and subadult specimens: largest specimen: SL: 107 mm, MD: 39 mm, mean SL: 88.2 mm (σ = 10.4), mean MD: 32 mm (σ = 3.7), spire angle: µ = 82.7° (σ = 4.3°), last whorl angle: µ = 22.3° (σ = 1.7°), LW: µ = 2.76 (σ = 0.19), RD: µ = 0.44 (σ = 0.03), PMD: µ = 0.95 (σ = 0.02), RSH: µ = 0.17 (σ = 0.03).

Discussion. This species is characterized by the concave sutural ramp bearing spiral striae, the distinct but rounded shoulder and rather moderate variability in outline. The largest variability is represented by the more or less prominent spiral sculpture. Hörnes (1851) had only a single complete specimen at hand, which has been largely destroyed thereafter; only the spire is preserved. Since then, numerous shells were collected at Baden, Baden-Sooß and Lăpugiu de Sus.

Paleoenvironment. The majority of shells were collected in basinal clays. In contrast, only a single specimen was found in the seagrass environment of Gainfarn ( Austria). This suggests that Plagioconus  extensus  was probably an offshore species.

Distribution in Paratethys. Badenian (middle Miocene): Alpine-Carpathian Foredeep: Grund ( Austria) ( Sieber 1947); Vienna Basin: Baden, Baden-Sooß, Gainfarn, Steinebrunn ( Austria) ( Hoernes & Auinger 1879; Sieber 1958b); Lavanttal Basin: Mühldorf ( Austria) (Wank 1981); Pannonian Basin: Hont, Letkés, Szob ( Hungary) ( Kovács & Vicián 2013); Transylvanian Basin: Lăpugiu de Sus, Coşteiu de Sus, Nemeşeşti ( Romania) ( Boettger 1902, 1906; Chira & Voia 2001); Dacian Basin: Opanec ( Bulgaria) ( Kojumdgieva & Strachimirov 1960). No reliable occurrences from the proto-Mediterranean Sea are known to date.

NHMW

Naturhistorisches Museum, Wien

Kingdom

Animalia

Phylum

Mollusca

Class

Gastropoda

Order

Neogastropoda

Family

Conidae

Loc

Plagioconus

Harzhauser, Mathias & Landau, Bernard 2016
2016
Loc

Plagioconus

Kovacs 2013: 79
2013
Loc

Conus (Leptoconus) extensus (Partsch in Hörnes 1856 )

Kojumdgieva 1960: 210
1960
Loc

Conus

Hauer 1837: 416
1837
Loc

Conus (Leptoconus) extensus Partsch—Hoernes & Auinger 1879 : 34

Auinger 1879: 34
Loc

Conus (Chelyconus) puschi Michelotti—Chira & Voia 2001 : 156

Voia 2001: 156
Loc

Conus extensus Partsch—Fözy & Szente 2014 : 311

Szente 2014: 311
Loc

Conus (Leptoconus) extensus Partsch—Chira & Voia 2001 : 156

Voia 2001: 156