Conus
(Hemiconus) turbinopsis (Deshayes, 1865)
Relatively large, ovately biconical Hemiconus without tubercles on
the adult whorls which are, however, slightly convex in the lower
part; subsutural cord divided into numerous somewhat elongate beads ; spire 33%
of shell height, protoconch large, up to diameter 1 mm, paucispiral of 1.75
whorls with a very shallow suture ; spire profile slightly convex
(cyrtoconoid), shoulder obtusely rounded, last whorl straight to mildly convex
in adults; ornament of spiral threads, usually weak or effaced, but more marked in smaller shells. Columella
more or less straight above, concave below. Up to 25 x 11 mm (DESHAYES, 1865); Cotentin specimens reach 25.2 x 11.2 mm. (3).
Distribuzione: Paris Basin and Cotentin (Néhou,
Gourbesville)
Periodo geologico: Middle Calcaire Grossier, Grignon,
Chaussy, St-Félix, Hérouval.
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Conus turbinopsis ? (2)
a, b: original figure of Conus turbinopsis after DESHAYES (1865)
pl. 100,
figs 10, 11. c. NHMUK PI TG 26837 (1)(coll. DESHAYES),
Mouchy-le-Châtel (Oise), France. (Scale bar 10 mm). v. discussion
of Hemiconus tromelini |
Hemiconus turbinopsis or Hemiconus lennieri ?
Yvelines - Thiverval-Grignon Parc de l'Institut national agronomique mm. 22
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Hemiconus turbinopsis(2) Plate 4
fig. 37 NHMUK PI TG
26873 (leg. O. GAIN) Gourbesville |
Hemiconus turbinopsis(2) Plate 4
fig. 38 NHMUK PI
TG 26874 (leg. B.
CRAIG) Néhou |
Hemiconus turbinopsis(2) Plate 4
fig. 39 NHMUK PI
TG 26875 (leg. O.
GAIN) Néhou |
Hemiconus turbinopsis(2) Plate 4 fig. 40 NHMUKPI
TG 26876 (leg. B.
CRAIG) Néhou |
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Hemiconus turbinopsis(2) Plate 4
fig. 40 NHMUKPI TG 26876 mm. 28,8 |
Hemiconus turbinopsis(2) Plate 4
fig. 37 NHMUK PI TG
26873 mm. 28,8 |
Hemiconus turbinopsis(2) Plate 4
fig. 38 NHMUK PI TG
26874 mm. 13,8 |
Bibliografia
Consultata
- (1) - G.P. Deshayes (1866) “Description des Animaus sans vertèbres découvert dans le bassin de Paris“, Parigi
- (2) - Steve Tracey,
Brian Craig, Laurent Belliard &
Olivier Gain “One, four or forty species? - early Conidae (Mollusca, Gastropoda)
that led to a radiation and biodiversity peak in the late Lutetian Eocene
of theCotentin, NW France.“