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Species / Latiala Tegulata


Original description of Alaria tegulata by Stoliczka, 1868:

  • "A. testa spira elongata, acuta, superficie polita; anfractibus 8-10, subconvexis, transversaliter costulatis; costulis parum obliquis, nonnullis fortioribus interdumque in anfractibus sucsedentibus contnuiis; ultimo anfractu circiter dirnidium totius altitudinis occupante, ad basim spiraliter striato; rostro elongato (?), tenui; labio calloso; labro expanso posterius uncinato (?), postice nonnunquam supra anfractum antepenultimum decurrente."
  • "The shell is rather elongated consisting of 8 or 10 whorls, which are slightly convex, transversally costulated and covered with a thin enamel callosity. These costae are usually very thin, sharpened and numerous, only some of them, in about one-third of one volution separated from each other, being somewhat stronger. On the last whorl, which is of about the same height as, or a little higher than, the spire, the ribs become more distant and often disappear altogether. When the shell is not enveloped in the callose secretion it appears to have been all over covered with very fine spiral striae; on the anterior portion of the last whorl this striation is usually retained. The transversal ribs owe their sharpness chiefly to the covering callosity, which unites them often through nearly the total height of the spire, continuing from one whorl to the other; this makes the sutures nearly obliterate, but they are always traceable by a slight impression. The rostrum is not entirely preserved in any of our specimens and we have indicated its probable length by an outline. The inner lip is rather callose and the secretion of the enamel-coating seems to proceed from this portion of the mantle. The outer lip is expanded, reaching posteriorly on the penultimate whorl and occasionally little higher; it seems to have been prolonged into a hook-like wing, while anteriorly it is much contracted. This species differs from A. acicularis by a greater height of the whorls of which the ribs are not so much oblique, by a smaller spiral and larger sutural angle, and apparently also by a greater length of the anterior canal or rostrum. The numerous ribs, resembling sharp lamellae, are characteristic of this species, and do not admit an identification with any known species, although when these lamellar ribs are not preserved, the resemblance becomes apparent to several others."

Stratum typicum: Trichinopoly Group, upper Cretaceous

Alaria tegulata in Stoliczka, pl. II, fig. 11, 12, 13

Dicroloma tegulata (Stoliczka, 1868); upper Cretaceous; Manandany, Atsimo-Andrefana Region, Madagascar; 26 mm; Coll. MNHN no. R06528; Copyright Museum national d'Histoire naturelle Paris

Specimens from private collections

Latiala tegulata (Stoliczka, 1868); Maastrichtian, upper Cretaceous; Belon'i Tsiribihina (formerly Belo-sur-Tsiribihina), Menabe Region, Madagascar; Coll. Ulrich Wieneke

Latiala tegulata (Stoliczka, 1868); Maastrichtian, upper Cretaceous; Belon'i Tsiribihina (formerly Belo-sur-Tsiribihina), Menabe Region, Madagascar; Coll. Ulrich Wieneke

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