Conus stromboides

Conus (Hemiconus) stromboides (Lamarck, 1802)

Original description of H. stromboides : “Conus(stromboïdes). Testa subfusiformis, infernè et versùs apicem sulcato-punctata; spirâ acutâ, obsoletè nodosâ: anfractibusobtusis. n. L. n. Grignon. Il est petit, strié, par-touttransversalement, et ressemble à un strombe à demi-formé.Mon cabinet.” (LAMARCK, 1802 : p. 387) [It is small, spirally striate all over, and resembles a half grown Strombus] ⁽¹⁾.

Emended diagnosis of H. stromboides : Fusiform, weakly spirally striate Hemiconus ; height : width ratio 2.4-2.9:1 ; spire c. 40% of shell height, ornamented with obscure low rounded central tubercles crossed by 3-4 spiral cords with 2-3 weaker spiral threads above ; beaded subsutural cord weakly present throughout growth ; body whorl covered in very close, fine spiral threads and profile slightly concave basally ; columella straight ; aperture widens towards the base; protoconch large, diameter c. 760 μm., paucispiral, of 1.75 whorls. Neotype 17.0 x 5.7 mm ⁽¹⁾.

Cotentin specimens reach 21.0 x 8.2 mm ⁽¹⁾.

Discussion of H. stromboides : LAMARCK’s (1802) ambiguous original figure and description are insufficient to define this species and subsequent identification has generally been based on DESHAYES’s (1835) more accurately drawn version. COSSMANN & PISSARRO (1907) figured as H. stromboides a shell that seems very similar to their figure of H. disjunctus (Deshayes, 1865). Confusion has since arisen from differing interpretations of H.stromboides featured on internet websites. Figures of shells missing part of the outer lip (e.g. TUCKER & TENORIO, 2009) appear more narrowly spindle-shaped than when complete. For these reasons and in accordance with ICZN (1999) Article 75.3, we consider it advisable to designate a neotype. Specimens corresponding to DESHAYES’s concept of H. stromboides occur uncommonly in the Cotentin (Plate 2, Figs. 10-12) ⁽¹⁾.

Hemiconus stromboides

*Hemiconus stromboides* Fig. 214 bis 1 (Cossmann & Pissarro 1907)		*Fig. 7 :* Hemiconus stromboides (Lamarck, 1802) ⁽¹⁾ NHMUK PI TG 26845 (leg. O. GAIN) Late Lutetian, Néhou

Hemiconus stromboides MNHN J17242

Figs. 9: Hemiconus stromboides Neotype NHMUK PI OR 31452(1) (coll. DESHAYES) mm. 17,0 x 5,7 Calcaire Grossier, Grignon (Yvelines)	Figs. 10 : Hemiconus stromboides NHMUK PI TG 26846 (leg. B. CRAIG) Fresville		Figs. 11: Hemiconus stromboides NHMUK PI TG 26847 (leg. S. TRACEY) Fresville

Figs. 12: Hemiconus stromboides (protoconch) NHMUK PI TG 26848 (leg. B. CRAIG) Néhou	Figs. 13: Hemiconus stromboides (protoconch) NHMUK PI TG 26849 (leg. S. TRACEY) Ferme de l’Orme.


Conus (Hemiconus) stromboides mm. 11,6 x 8,0 Luteziano – Yvelines, Ferme de l’Orme (ID. 311) [AZFC 402-00]	Conus (Hemiconus) stromboides Luteziano – Yvelines, Ferme de l’Orme (ID. 311) [AZFC 402-01]	Conus (Hemiconus) stromboides Luteziano – Yvelines, Ferme de l’Orme (ID. 311) [AZFC 402-02]

Conus (Hemiconus) stromboides mm. 9,6 Luteziano – Yvelines, Ferme de l’Orme (ID. 311) [AZFC 402-03]	Conus (Hemiconus) stromboides mm. 7,3 Luteziano – Yvelines, Ferme de l’Orme (ID. 311) [AZFC 402-04]