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Species / Dilatilabrum Roegli

Dilatilabrum Roegli

Stromboidea


Original Description of Strombus (Dilatilabrum) roegli by Harzhauser, 2001, p. 55:

  • "Shell very thick and extremely massive. Protoconch destroyed in all available specimens. Moderately tall spire formed by the early 5 to 6 whorls with an apical angle between 60 to 80. These spire whorls are slightly convex, decorated (sometimes) by five weak spiral ribs in their anterior half and bear marginal knobs at the anterior suture. The following 2 or 3 whorls get abruptly broader and form a bulgy sutural shelf, separated only by deeply incised, irregular, wavy sutures. At the transition from the sutural shelf to the flank the body whorl bears a prominent bulge from where the base contracts rapidly in a marked concavity and terminates in a strongly deflected canal. Although the shoulder is formed by a heavily thickened and somewhat asymmetric callous bulge, no spines are observed at any investigated specimen. On the ventral side this bulge may sometimes even expand in posterior direction, thus towering the spire markedly. Dorsally the body whorl is strongly concave; no sculpture is developed but faint growth lines. On the base, the shell is slightly flattened and develops a thick columellar callus. Columella and aperture are smooth. The body whorl ends in a giant wing. The bulgy angulation of the last whorl holds on to this wing where it forms a prominent edge. The adaxial, posterior part of the wing is straight or concave, whereas the abaxial part is well-rounded and passes into a very shallow stromboid-notch. Canal bent and narrow. Outer lip very thick, broadly flared, with a very high posterior expansion that exceeds the spire distinctly. Adult shells are totally smooth. However, shells of juveniles or broken adults, which still show the flanks of early whorls, display close-set, rounded spiral-ribs on the base. The total height of adult shells usually attains about 24 cm. Casts at the sections Chalehghreh and Zefreh, measured in the field, suggest maximum sizes up to 30 cm."
  • "Intraspecific variability: The vast number of shells observed in the field document a rather low variability concerning the wing form and the stromboid notch. In contrast, the spire height and the apical angle vary widely. Similarly, the swelling along the ventral side of the body whorl, which sometimes even exceeds the spire, is very variable."

Locus typicus: Doutsiko, Mesohellenic Basin, Greece

Stratum typicum: Chattian, late Oligocene

Types: Holotype NHMW no. 2000Z0137/0001

Strombus (Dilatilabrum) roegli Harzhauser, 2001; Holotype; Chattian, Oligocene; Doutsiko, Greece; Coll. NHMW no. 2000z137/0001


References

  • Harzhauser, M. 2001. Strombus (Dilatilabrum) roegli sp. nov. - a giant Oligocene strombid (Gastropoda) and its bearing on palaeoclimatic reconstructions of the Western Tethys; Ann. Naturhist. Mus. Wien 102 A, 51-67, Fulltext

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