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Species / Myurusina Sublaevigata


Original Description of Alaria sublaevigata by Hudleston, 1887, p. 129:

  • "The points in which this species or variety differs from Al. myurus, Desl., are: - the general form is slightly more elongate in the majority os specimens, the whorls are less tumid, and the position of the spine on the posterior keel is differently placed; in this case being nearly three-quarters of a turn above the commencement of the wing; the anterior keel is also better defined on the side of the columella; the aperture is somewhat more triangular."

Dimensions: "Length 28 mm. Width of body-whorl to height of shell 44:100. Spiral angle 34°"

Types: Woodwardian Museum, Cambridge (Woods, 1891)

Hudleston, 1887, p. 130:

  • "Relations and Distribution. - In some respects this species has more resemblance to Al. Laevigata, M. and L., but the position of the principal spine, the comparative straightness of the canal, the keel in the penultimate, and the well-developed spiral lines, should, if Piette's description is to be accepted, distinguish Al. sublaevigata from the Great-Oolite species. Occurs sparingly in the Inferior Oolite of North Dorset, and chiefly in the Sowerbyi- or concavus-bed. The variety shown in figs. 3'a and 3'b from Bradford Abbas has a smooth outline, and but for the position of the spine might almost be referred to Al. myurus. The specimen, 3b, is from Yorkshire Dogger."

Alaria sublaevigata Hudleston, 1887, pl. VI, fig. 3

  • top row:
    • 3a. Al. sublaevigata, sp. nov. Sowerbyi-bed, Bradford Abbas. My collection. (Page 129.)
    • 3'a. Al. sublaevigata var. Sowerbyi-bed, Dorset. Buckman collection. (p. 130.)
    • 3b. The same. [as 3a] Another specimen. Dogger, Blue Wyke. Leckenby collection.
  • bottom row
    • 3'b. The same. [as 3'a] Another specimen. Sowerbyi-bed, Bradford Abbas. Buckman collection.

History and Synonymy


Lorenz, 1900 about Alaria sublaevigata:

  • p. 32: "Ein schlankes, hohes Gehäuse mit konvexen Umgängen. Die vorletzte Windung trägt einen deutlichen Kiel. Feine Horizontalrippen. - Der untere Teil dieses Exemplars ist nachträglich umgeknickt. Ein Teil der Schale ist verdeckt. Deshalb stehe ich von einer Abbildung ab. Trotzdem ist die Übereinstimmung sehr gross. Verwandte Arten: A. myurus H., weicht durch seine gedrungene Gestalt ab. A. laevigata Mor. et Lyc., besitzt keinen Kiel auf dem vorletzten Umgang. - Vorkommnis: Bajocien von Bajeux etc.


  • Th. Lorenz, 1900. Monographie des Fläscherberges. Mit 13 Zinkographien, einer geologischen Karte in 1:25,000 und 4 Tafeln Profile, Ansichten und Petrefakten. Beiträge zur Geologischen Karte der Schweiz, Neue Folge, X. Lieferung, pp. 1-63, 1 map, pl. 1-5 Fulltext
  • Henry Woods, 1891. Catalogue of the Type Fossils in the Woodwardian Museum, Cambridge; University Press, Cambridge, pp.1-179 Fulltext

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