Ticinella madecassiana

Taxonomy

Original description: Diagnose: espèce peu ornée caractérisée par un enroulement trochospirale mais subsymétrique, la spire initiale étant débordée dorsalement par le dernier tour - et par une croissance rapide des loges de celui-ci.
[A species weakly ornamented, characterized by a trochospiral but sub-symmetrical coiling, by an initial spire overhung by the last whorl and by its rapidly increasing chambers]

Description: test de petite taille à paroi finement et densément perforée; le nombre de loges au dernier tour de spire est de 6-7; 2 tours environ; elles augmentent régulièrement et rapidement de taille au dernier tour; l'enroulement est subsymétrique, le dernier tour surplombant de manière importante le reste de la spire, dont la trochoïdicité est faible; la périphérie est largement arrondie, le contour du test est fortement lobé.
La face spirale montre des sutures assez rectilignes, obliques, de plus en plus déprimées vers les dernières loges; la surface des loges est fortement enflée.
La face ombilicale montre un ombilic profond et assez étroit; la surface des loges est enflée, les sutures radiales rectilignes, et fortement déprimées; les expansions lamellaires se soudent en une plaque peu importante, en forme d'entonnoir.
La face terminale est fortement enflée, plus large que haute. L'ornementation est peu prononcée, on l'observe uniquement sur le tour de spire interne.
L'ouverture principale est haute et remonte largement vers la marge péri¬ phérique; la lèvre qui la surmonte est peu développée. L'ouverture supplémentaire est petite, pratiquement en position intraombilicale.
L'enroulement est apparemment à dominance dextre (66%) (contrairement à ce que laisserait entendre les formes figurées).

[Description: Small test with a finely and densely perforate wall, numbering 6-7 chambers in the last whorl; they increase regularly and rapidly in size in the last whorl; the coiling is sub-symmetrical, the last whorl clearly overhanging the remaining low spire; the periphery is rounded and the outline strongly lobate.
The spiral side displays quite straight, oblique sutures becoming more and more depressed toward the last chambers; the chambers surface is strongly inflated.
The umbilical side displays a deep and quite narrow umbilicus; the chambers surface is inflated, the sutures radial, straight and strongly depressed; the wall extensions fuse into a funnel-shaped small plate.
The apertural side is strongly inflated, broader than high.
The ornamentation is not clearly marked. It is noticeable only on the internal spire.
The main aperture is high, largely extending toward the periphery. The overlying lip is poorly developed. The supplementary aperture is small almost intraumbilical in position. 
The coiling appears to be mostly dextral (66%), as opposed to what may be understood from the figured specimens.]

Entries in the Catalog of original descriptions: Ticinella madecassiana

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. madecassiana zone (0% up, 112.4Ma, 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 madecassiana, synonyms included - Ticinella madecassiana;
• See also space-time plot :: Samples map :: Parent: Ticinella

Ticinella madecassiana 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=110554 Go to Archive.is to create a permanent copy of this page - citation notes

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