Monteiroconus antiquus ( Lamarck, 1810 ),

Harzhauser, Mathias & Landau, Bernard, 2016, A revision of the Neogene Conidae and Conorbidae (Gastropoda) of the Paratethys Sea, Zootaxa 4210 (1), pp. 1-178: 102-104

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

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scientific name

Monteiroconus antiquus ( Lamarck, 1810 )
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Monteiroconus antiquus ( Lamarck, 1810) 

Figs 17 N, 24A1–A3, 24B1–B3, 24C1–C3

Conus antiquus Lamarck 1810: 439  .

Conus Acuminatus  nobis—Borson 1820: 194, pl. 1, fig. 2 [non Conus acuminatus Bruguière, 1792  ].

Conus tarbellianus Grat.  —Hörnes 1851: 33, pl. 4, figs 1a –b, 2 [non fig. 3?].

Conus subacuminatus d’Orb.  —d’Orbigny 1852: 5 [nom. nov. pro C. acuminatus Borson, 1820  , non Bruguière, 1792].

Conus (Leptoconus) Tarbellianus Grat.  var. Sharpeanus  da Costa—Hoernes & Auinger 1879: 32, pl. 4, fig. 1. [ Conus virginalis Brocc.  ] var. epellus De Greg.  — De Gregorio 1885: 364.

Conus (Lithoconus) subacuminatus (d’Orbigny)  — Csepreghy-Meznerics 1956: 420, pl. 11, figs 5–6.

Conus (Lithoconus) subacuminatus d’Orbigny, 1852  — Strausz 1966: 454, pl. 67, fig. 13.

? Conus (Lithoconus) subacuminatus  d’Orbigny—Bohn-Havas 1973: 1069, pl. 7, fig. 10.

? Conus antiqus  [sic] Lamarck – Chira & Voia 2001: 156, pl. 1, figs 3a –b.

Monteiroconus antiquus ( Lamarck, 1810)  — Landau et al. 2013: 241, pl. 38, figs 5–6, pl. 41, fig. 10, pl. 42, fig. 4, pl. 81, figs 4– 5 [cum syn.].

non Conus (Lithoconus) antiquus concavespira (Sacco, 1893)  — Atanacković 1985: 180, pl. 40, figs 7–10. non Lithoconus antiquus ( Lamarck, 1810)  — Kovács & Vicián 2013: 74, figs 74–76.

Type material. Lectotype catalogue number MNHN B35774View Materials, stored in the Muséum national d'histoire naturelle, Paris; no detailed locality given; Piedmont Italy, probably Burdigalian (early Miocene). This specimen was found again in the Paris collection in the 1980s (Ferrero-Mortara et al. 1984). Therefore, Hall (1966) considered the type specimen as lost and designated a neotype based on a Burdigalian specimen from the Turin Hills in the Saccocollection of the Museo Regionale di Scienze Naturali, Torino (BS.038.02.021). 

Studied material. 1 spec. NHMW 1853/0003/0007, 1 spec. NHMW 1846/0037/0035, 2 spec. NHMW 1855/ 0014/0364, 3 spec. NHMW 1856/0001/0364, 2 spec. NHMW 1856/0004/0034, 1 spec. NHMW 1856/0050/0112, 1 spec. NHMW 1863/0015/1283, 2 spec. NHMW 1997z0178/1480, 1 spec. NHMW 1970/1396/1486, 9 spec. NHMW 2013/0479/2041, 2 spec. NHMW 2013View Materials /0479/1623, GBA 1856/004/0003, illustrated in Hörnes (1851, pl. 4, fig. 1), all Gainfarn ( Austria); 4 spec  . NHMW 1858View Materials /0015/0067, Steinebrunn ( Austria); 2 spec  . NHMW 1860/ 0001/0063, 1 spec. NHMW 1851View Materials /0010/0007, illustrated in Hörnes (1851, pl. 4, fig. 2), 1 spec  . NHMW 1850View Materials /0001/ 0 0 54, illustrated in Hoernes & Auinger (1879, pl. 4, fig. 1), all Mikulov-Kienberk ( Czech Republic). 

Illustrated material. Figs 24AView FIGURE 24 1View FIGURE 1 –A3: SL: 137.3 mm, MD: 68.7 mm, NHMW 2016View Materials /0048/0001; all Gainfarn ( Austria)  ; Figs 24View FIGURE 24 B1–B3, 17N: SL: 109.8 mm, MD: 49.1 mm, NHMW 1970/1396/1486; Figs 24View FIGURE 24 C1–C3: SL: 128.4 mm, MD: 59.9 mm, NHMW 1856/0050/0112.

Description: Large shells with low, coeloconoid spire. Early spire whorls angulated, later distinctly concave with spiral striae, which are most prominent on the adapical half of the whorls. Subsutural flexure moderately deep, moderately curved, strongly asymmetrical. Last whorl elongate, straight-sided; position of maximum diameter close below shoulder; weakly constricted at base. Weak spiral grooves on abapical third of last whorl are usually developed and become stronger and more closely spaced abapically. Aperture narrow, straight, slightly narrowed in middle part. Siphonal canal long, weakly recurved posteriorly with broad, rounded fasciole. Colour pattern under UV light consisting of numerous, thin, continuous and regular brown spiral lines covering the entire last whorl.

Shell measurements and ratios. n = 10 adult and subadult specimens: largest specimen: SL: 128.4 mm, MD: 59.9 mm, mean SL: 107.9 mm (σ = 14.2), mean MD: 51.12 mm (σ = 6.5), spire angle: µ = 107.9° (σ = 8.8°), last whorl angle: µ = 26° (σ = 1.9°), LW: µ = 2.1 (σ = 0.1), RD: µ = 0.56 (σ = 0.03), PMD: µ = 0.94 (σ = 0.03), RSH: µ = 0.16 (σ = 0.03).

Discussion. This species is an outlier within Monteiroconus  concerning the strongly elongate last whorl. Nevertheless, we follow Tucker & Tenorio (2009) and place it in Monteiroconus  based on its genus-typical spire and sculpture. The colour pattern of Serravallian specimens of M. antiquus  from the Karaman Basin in Turkey consists of narrow, axially arranged flammules ( Landau et al. 2013), thus differing from the Paratethyan shell with densely spaced, continuous spirals. Comparable patterns, however, are also documented from Tortonian shells from Montegibbio ( Italy) (see Davoli 1972). This is among the largest cone shells in the Paratethys and is recognized easily by its slender shell with short coeloconoid spire and concave spire whorls. Hoernes & Auinger (1879) illustrated a rather bulky subadult shell, which they identified with the smaller and shorter Conus sharpeanus Pereira  da Costa, 1866. De Gregorio (1885) introduced epellus as new name for the specimens illustrated in Hörnes (1851, pl. 4, figs 1–3), which is considered herein to be a subjective junior synonym of Conus antiquus Lamarck, 1810  . The juvenile specimen illustrated by Hörnes (1851, pl. 4, fig 3.) was excluded by Hall (1966) from C. antiquus  and placed it in Plagioconus elatus ( Michelotti, 1847)  . Unfortunately, this specimen is lost and its status remains unclear.

Paleoenvironment. Monteiroconus antiquus  occurs only in shallow sublittoral settings. At localities, such as Gainfarn and Mikulov it was inhabiting sea grass meadows ( Zuschin et al. 2007).

Distribution in Paratethys. Badenian (middle Miocene): Vienna Basin: Gainfarn, Steinebrunn, Pötzleinsdorf ( Austria) ( Hoernes & Auinger 1879; Sieber 1958b), Mikulov-Kienberk ( Czech Republic) ( Hoernes & Auinger 1879); Pannonian Basin: Pécsszabolcs, Szob ( Hungary) ( Strausz 1966); Transylvanian Basin: Lăpugiu de Sus ( Romania) ( Chira & Voia 2001).

Proto-Mediterranean Sea and northeastern Atlantic. Widespread during the early Miocene to late Miocene in the northeastern Atlantic and the Proto-Mediterranean Sea; the species persists into the Pliocene in the Mediterranean Sea (see Landau et al. 2013 for detailed references).

MNHN

Museum National d'Histoire Naturelle

NHMW

Naturhistorisches Museum, Wien

Kingdom

Animalia

Genus

Monteiroconus

Loc

Monteiroconus antiquus ( Lamarck, 1810 )

Harzhauser, Mathias & Landau, Bernard 2016
2016
Loc

Monteiroconus antiquus (

Landau 2013: 241
2013
Loc

Conus antiqus

Chira 2001: 156
2001
Loc

Conus (Lithoconus) antiquus concavespira

Kovacs 2013: 74
Atanackovic 1985: 180
1985
Loc

Conus (Lithoconus) subacuminatus d’Orbigny, 1852

Strausz 1966: 454
1966
Loc

Conus (Lithoconus) subacuminatus (d’Orbigny)

Csepreghy-Meznerics 1956: 420
1956
Loc

Conus (Leptoconus) Tarbellianus Grat.

De 1885: 364
Auinger 1879: 32
1879
Loc

Conus antiquus

Lamarck 1810: 439