Ticinella praeticinensis

Taxonomy

Original description: Diagnose: espèce caractérisée par le mode d'enroulement et le nombre de loges de la sous-espèce Rotalipora ticinensis subticinensis, mais avec un développement dense de pustules et papilles à la place de la carène proprement dite.
[Species characterized by its mode of coiling and by the number of chambers of the subspecies Rotalipora ticinensis subticinensis, but with a growth of pustules and papillae closely packed instead of a proper keel.]

Description: test de petite taille, finement et densément perforé; l'enroulement trochospirale est très peu élevé, donnant au test un profil à peu près symétrique et très surbaissé; on observe 2,5 à 3 tours de loges croissant régulièrement et très lentement, en particulier sur la fin ; on en compte 7 à 8 au dernier tour; le dernier demi-tour (délimité par une ligne partant de la base de la dernière loge et passant par le proloculum) comporte plus de 4 loges; la périphérie est renforcée par une accumulation dense de papilles ou pustules, dont l'importance décroît peu à peu, les 4 à 5 dernières loges ne montrent finalement qu'une marge à peine anguleuse, perforée; le contour extérieur est nettement lobé.
La face spirale montre un dernier tour en général surbaissé par rapport aux tours internes au niveau des dernières loges; la surface des loges est fortement enflée, les sutures sont subradiales et fortement déprimées; la suture spirale est fortement déprimée.
La face ombilicale montre des loges assez fortement enflées, séparées par des sutures déprimées radiales et rectilignes, leur forme est typiquement triangulaire, elles s'abaissent lentement vers l'ombilic. L'ombilic est assez profond, large. Les expansions lamellaires se soudent en une rampe hélicoïdale qui obture largement l'ombilic.
La face terminale est fortement enflée, à peu près isodiamétrique, petite.
L'ornementation est constituée uniquement par les pustules et papilles, densément réparties sur la face spirale des tours internes et des 3 à 4 premières loges du dernier tour; elles sont peu développées sur la face ombilicale; à la périphérie elles sont plus densément assemblées et souvent plus grosses, simulant une bande carénale, la paroi demeure perforée entre elles.
L'ouverture principale est allongée, assez haute, atteignant presque la marge périphérique; elle est surmontée par une lèvre large.
Les ouvertures supplémentaires sont très petites, en position intra-ombilicale, sauf les 1 2 dernières qui migrent légèrement dans la suture; elles sont surmontées par une lèvre ténue.
Enroulement: apparemment 2/3 sénestres, 1/3 dextres.

[Description: Small test finely and densely perforate; very low trochospire producing a more or less symmetrical, compressed profile. One can see 2.5 to 3 whorls with chambers increasing regularly and very slowly, especially toward the end; numbering 7 to 8 in the last whorl; the last half-whorl (bounded by a line starting from the base of the last chamber to the proloculus) comprises more than 4 chambers; the periphery is thickened by an accumulation of papillae or pustules, the importance of which decreases slowly, the 4 to 5 last chambers only displaying a margin barely angular, perforate; the outline is clearly lobate.
The spiral side displays a last whorl - especially its last chambers - generally sunken compared to the internal whorls; the chambers surface is strongly inflated, the sutures subradial and strongly depressed; the spiral suture is strongly depressed.
The umbilical side displays quite strongly inflated chambers separated by depressed, radial and straight sutures, their shape typically triangular and gently dipping toward the umbilicus. The latter is fairly deep, broad. The wall extensions fuse into a helicoidal ramp which seals most of the umbilicus.
The apertural side is strongly inflated with more or less equal dimensions, small.
The ornamentation consists solely of pustules and papillae densely distributed on the spiral side of the internal whorls and on the 3 to 4 first chambers of the last whorl; they are weakly developed on the umbilical side, more densely gathered and often bigger along the periphery simulating a carinal band, the wall between the pustules remaining perforate.
The main aperture is elongate, fairly high, almost reaching the periphery; it is capped by a broad lip.
The supplementary apertures are very small, intraumbilical in position except for the last one or two which move slightly away from the umbilicus, along the sutures. They are capped by a thin lip.]

Les ouvertures supplémentaires sont très petites, en position intra-ombilicale, sauf les 1 2 dernières qui migrent légèrement dans la suture; elles sont surmontées par une lèvre ténue. Enroulement: apparemment 2/3 sénestres, 1/3 dextres.

Entries in the Catalog of original descriptions: Ticinella praeticinensis

Geological Range:
Last occurrence (top): within P. appenninica zone (100.50-101.92Ma, top in Albian stage). Data source: [copied from Chronos database]
First occurrence (base): at base of T. praeticinensis zone (0% up, 107.4Ma, in Albian stage). Data source: zonal marker (from Timescale Creator)

Plot of range and occurrence data:

• Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
• Triangles indicate an event for which a precise placement has been suggested
• Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
• Taxon plotted: Ticinella praeticinensis, synonyms included - Ticinella praeticinensis;
• See also space-time plot :: Samples map :: Parent: Ticinella

Ticinella praeticinensis compiled by the pforams@mikrotax project team viewed: 13-10-2024 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/pforams/index.php?id=110556 Go to Archive.is to create a permanent copy of this page - citation notes

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