Stromboidea

• Strombidae
  • Dilatilabrum
    • Dilatilabrum trigonum (Grateloup, 1834)

Original Description of Strombus trigonus by Grateloup, 1834, p. 191:

• "S. Testa turbinato-trigona, tuberculifera, transversim late subsulcosa; ultimo anfractu superne tuberculis majoribus coronato; apertura laevigata; labro crassissimo, expanso, integro, anterius in acumen elongatum producto. Spira brevi."

Measurements: "6 à 7 tours de spire. Longueur: 3 pouces et demi. Diamètre: 2 pouces 8 lignes."

Locus typicus: Dax, Landes Department, France

Stratum typicum: "Faluns jaunes de Saint-Paul."

Strombus tricornis Grateloup, 1845, "Rostellaires Strombes", pl. 2, fig. 1a, 1b

• in the legend of the plate, Grateloup uses the name Strombus trigonus

History and Synonymy

Dilatilabrum trigonum (Grateloup, 1834:191) [as Strombus trigonus]

1904

Strombus (Monodactylus) trigonus in Cossmann, 1904, pl. I, fig. 6, 10

Specimens from institutional collections

Dilatilabrum trigonum (Grateloup, 1834); Aquitanian, lower Miocene; Le Planta, Saint-Morillon, Gironde Department, France; 140 mm; Ex-coll. Benoist; Coll. Museum d'Histoire Naturelle de Bordeaux no. 2007.9868

Dilatilabrum trigonum (Grateloup, 1834) ; Aquitanian, lower Miocene; Le Planta, Saint-Morillon, Gironde Department, France; 114 mm; Ex-coll. Boudin, 1877; Coll. Museum d'Histoire Naturelle de Bordeaux no. 2007.9864

Dilatilabrum trigonum (Grateloup, 1834); no locality data; Miocene; Aquitaine, France; 84 mm; Ex-coll. Benoist; Coll. Museum d'Histoire Naturelle de Bordeaux no. 2014.14.12

Dilatilabrum trigonum (Grateloup, 1834); lower Burdigalian, lower Miocene; Mérignac, Gironde Department, France; 83 mm; Coll. Museum d'Histoire Naturelle de Bordeaux no. 2007.9573

Dilatilabrum trigonum (Grateloup, 1834); Aquitanian, lower Miocene; Le Plantat, Saint-Morillon, Gironde Department, France; Coll. Stichtung Schepsel Schelp no. 13229

Strombus trigonus (Grateloup, 1834; Aquitanian, lower Miocene; Le Thil, Léognan, Gironde Department, France; Coll. MNHN; Copyright Museum national d'Histoire naturelle Paris

Specimens from private collections

Dilatilabrum trigonum (Grateloup, 1834); Aquitanian, lower Miocene; Le Thil, Léognon, France; Coll. Jean-Francois Lesport

Dilatilabrum trigonum (Grateloup, 1834); Aquitanian, lower Miocene; Le Plantat, Saint-Morillon, Gironde Department, France; 115 mm; Coll. Alain Cluzaud

Dilatilabrum trigonum (Grateloup, 1834); Aquitanian, lower Miocene; Le Plantat, Saint-Morillon, Gironde Department, France; 130 mm; Coll. Alain Cluzaud

Dilatilabrum trigonum (Grateloup, 1834); Aquitanian, lower Miocene; Le Plantat, Saint-Morillon, Gironde Department, France; 110 mm; Coll. Alain Cluzaud

Dilatilabrum trigonum (Grateloup, 1834); Aquitanian, lower Miocene; Le Plantat, Saint-Morillon, Gironde v, France; 84 mm; Coll. Didier Gourgues

Dilatilabrum trigonum (Grateloup, 1833); Burdigalian?, lower Miocene; Léognan, Gironde Department, France; Coll. Laurent Lacombe

Dilatilabrum trigonum (Grateloup, 1833); Aquitanian; lower Miocene; Mesohellenic Basin, Greece; 80 mm; Coll. Nikos Bacharidis

References:

• Grateloup, J.P.S. de. 1834
• Grateloup, J.P.S. de. 1845-1847
• J.-F. Lesport, A. Cluzaud & A. Verhecken, 2012. Les publications du Docteur Jean-Pierre Sylvestre de Grateloup sur les mollusques fossiles du Bassin d’Aquitaine (S.-O. France) : dates de parutions et commentaires; Bull. Soc. Linn. Bordeaux, Tome 147, nouv. série n° 40 (4), 2012 : 417-485.
• Magne & Vergneau-Saubade, 1972
• Mongin, 1952

Comments Virgilio Liverani: probably in genus Lobatus, linked to Lobatus dominator (Pilsbry, 1917) from Caribbean Miocene