Conus (Hemiconus) tremletti (Le Renard, 1994)

Diagnosis of H. tremletti : Small, biconical Hemiconus, spire c. 37% of shell height; protoconch small, diameter c. 510 μm., paucispiral, of 1.75 whorls with distinct sutures; teleoconch more or less smooth with 10-12 prominent tubercles per whorl, central on the first whorl but low on the remaining spire whorls, typically resting on and partly obscured by the following whorls; subsutural cord rather irregularly and obscurely beaded; 2-4 spiral threads on the ramp; last whorl straight-sided to slightly sinuous with close fine cords becoming stronger basally. Size 11 x 5 mm.

(DESHAYES, 1865). Cotentin examples reach 11.4 x 5.2 mm.

Discussion of H. tremletti : Shell more distinctly biconical and nodules smaller than the sharp tubercles of H. disjunctus (Deshayes, 1865), from which it also differs by its smaller protoconch.

Hemiconus tremletti Le Renard, 1994 ⁽¹⁾

as Conus nodulosus after DESHAYES (1865)

pl. 100, figs. 24, 25, 26

Figs. 80 – 84. Hemiconus tremletti (Le Renard, 1994)

80. NHMUK PI TG 26909 (leg. B. CRAIG) Néhou

81. NHMUK PI TG 26910 (leg. B. CRAIG) Néhou

82. NHMUK PI TG 26911 (leg. B. CRAIG) Néhou

83. NHMUK PI TG 26912 (leg. B. CRAIG) Néhou

84. (protoconch) NHMUK PI TG 26913 (leg. S. TRACEY) Néhou.

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Bibliografia Consultata

• (1) – Tracey, Craig, Belliard, Gain (2016) “One, four or fourty species? Early Conidae (Mollusca, Gastropoda) tha led to a radiation and biodiversity peak in the late Lutetian Eocene of the Cotentin, NW France”

• (2) - LE RENARD (J.) – 1994 – Révision des Mollusques paléogènes du Bassin de Paris. 1 : Rectifications de nomenclature d'espèces. Cossmanniana, 3 (2): 35-40.