Conus (Leptoconus) diversiformis edwardsi
(Cossmann, 1889)
Conus (Leptoconus) diadema (Cossmann, 1856)
Conus
(Leptoconus) diadema pyriformis (Edwards, 1856)
Descrizione e caratteristiche:
R. D. — Quoique la spire de
cette espèce soit variable, comme l'indiquent les figures du premier ouvrage
(p. 747, pi. XCVIII, fig. 9-12), C. diversiformis a toujours un contour
concave qui la caractérise et la distingue du C. deperditus; le profil
du dernier tour est exactement conique, sa surface est lisse, sauf en avant, où
il y a quelques sillons obliques. La coquille qu'Edwards rapporte à tort au C.
deperditus ressemble beaucoup plus à celle-ci, mais elle a une forme
trapue, plus courte, d'un quart plus large en arrière, le profil du dernier
tour est plus concave et les sillons de la surface persistent davantage en
arrière : je propose, pour cette variété, le nom C. Edwardsi, nob. On
peut encore rapprocher de cette espèce le C. planus, Schauroth, du
Kressenberg, créé pour des moules internes, peu déterminables. Aj. loc. Les
Groux, var. Edwardsi, coll. Chevallier. Dans le Cotentin, Hauteville, coll. Cossmann. En Angleterre, Selsey, Bramshaw, coll.
Cossmann (2).
Although the spire of this species is variable,
as indicated by the figures of the first work (p. 747, pi. XCVIII, fig.
9-12), C. diversiformis always has a concave contour which characterizes
it and distinguishes it from C. deperditus; the profile of the last turn
is exactly conical, its surface is smooth, except in front, where there are a
few oblique furrows. The shell that Edwards erroneously relates to C.
deperditus looks much more like this, but it has a stockier shape, shorter,
a quarter wider behind, the profile of the last whorl is more concave, and the
grooves of the surface persist further back: I propose, for this variety, the
name C. Edwardsi, nob
(2).
We can also compare this species with C. planus,
Schauroth, from Kressenberg, created for internal moulds, which are difficult
to determine (2).
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Conus Leptoconus diversiformis edwardsi
juvenilis 12 mm. |
Conus Leptoconus diversiformis
edwardsi juvenilis
8 mm. |
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mm. 72 x 42 |
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[AZFC N. 219-00] - Conus Leptoconus diversiformis
edwardsi ( Cossmann
1889 ) - [mm. 41,3 x 21,8 ] - Eocene, Luteziano Shepherds Gutter Bed,
Selsey Fm., Upper Bracklesham Beds – Brook, New Forest, Hampshire |
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[AZFC N. 219-01] - Conus Leptoconus diversiformis
edwardsi (
Cossmann 1889 ) - [mm. 27,8 x 13,6 ] - Eocene, Luteziano Shepherds Gutter Bed, Selsey Fm., Upper Bracklesham Beds
– Brook, New Forest, Hampshire
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[AZFC N. 219-02] - Conus Leptoconus diversiformis
edwardsi (
Cossmann 1889 ) - [mm. 20,7 x 10,6 ] - Eocene, Luteziano Shepherds Gutter Bed, Selsey Fm., Upper Bracklesham
Beds – Brook, New Forest, Hampshire |
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mm. 45 |
Conus diversiformis edwardsi mm. 41,3 x 21,8 Eocene, Luteziano [AZFC
N. 219-00] |
Conus Leptoconus diversiformis edwardsi mm. 27,8
x 13,6 Eocene,
Luteziano [AZFC N. 219-01] |
Conus Leptoconus diversiformis edwardsi mm. 20,7
x 10,6 Eocene, Luteziano [AZFC N. 219-02] |
Conus Leptoconus diversiformis
edwardsi mm. 12 |
Conus Leptoconus diversiformis
edwardsi mm. 8 |
Bibliografia Consultata
- (1)
- Steve TRACEY, Brian CRAIG, Laurent BELLIARD & Olivier GAIN (2017) – “One, four or forty species? - early Conidae (Mollusca, Gastropoda)
that led to a radiation and biodiversity peak in the late Lutetian Eocene
of the Cotentin, NW France.”
- (2)
– Cossman (1889) “Catalogue illustré des Coquilles Fossiles de l’Eocene
des environs de Paris”