| Sub-taxa & variants (time control age-window is: 0-800Ma) | ||||
| | | Ticinella raynaudi aperta | |
| | | Ticinella raynaudi digitalis | |
Taxonomy
Original description: Diagnose: espèce caractérisée par un test relativement peu épais possédant une périphérie nettement lobée, voire digitiforme (variété digitalis), et doué d'un enroulement assez peu serré, voire à tendance evolute (variété aperta).
[A species characterized by a comparatively thin test provided with a clearly lobate periphery or even having radially elongate chambers (variety digitalis) and a loosely coiled arrangement even with tendency to uncoil (variety aperta).]
Description: test de petite taille, à paroi finement et densément perforée; le nombre de loges au dernier tour est de 6-9 loges selon les sous-espèces; sur deux tours et demi environ, elles augmentent régulièrement de taille; l'enroulement trochospirale est peu dissymétrique, le test est relativement peu épais, avec faces spirale et ombilicale aplaties, la trochoïdicité est faible, la périphérie est réguliè¬ rement arrondie; le contour du test est fortement lobé.
La face spirale montre un dernier tour parfois un peu surbaissé par rapport aux tours internes, au niveau des dernières loges; la surface des loges est globuleuse, les sutures radiales, un peu cintrées, ainsi que la ligne spirale sont fortement déprimées.
La face ombilicale montre un ombilic de grande taille, très ouvert et peu profond; la surface des loges est enflée, les sutures radiales, rectilignes et fortement déprimées; les loges se prolongent par des expansions lamellaires qui se soudent en une plaque ombilicale en forme d'entonnoir.
La face terminale est enflée, ses dimensions sont variables selon les variétés.
L'ornementation est toujours présente, mais relativement peu développée, sous forme de petites pustules arrondies, plus importantes en approchant de la périphérie, où elles se groupent même en protubérances plus importantes et plus irrégulières; elle est présente sur les tours internes et sur 2-3 loges du dernier tour.
L'ouverture principale est intériomarginale, haute, grande et remontant plus qu'à mi-chemin de la distance ombilic-face spirale. Elle est protégée par une lèvre ténue, importante; leur ensemble, dans l'ombilic, constitue par soudure une plaque en forme d'entonnoir. L'ouverture supplémentaire est partiellement en position intrasuturale, en général peu élevée et large, bordée par un léger bourrelet. L'enroulement accorde une place importante (au moins 50%) aux formes sénestres.
[Description: small test with a wall finely and densely perforate; numbering 6 to 9 chambers in the last whorl in accord with the various subspecies; forming approximately two and half whorls and increasing gradually in size; the trochospiral coiling is slightly asymmetrical, the test comparatively thin with flat spiral and umbilical sides, with a low trochospire; the periphery is evenly rounded, the outline of the test strongly lobate.
The spiral side displays a last whorl sometimes sunken compared to the internal whorls, especially so for the last chambers; inflated chambers surface, sutures radial, slightly curved. Intercameral and spiral sutures strongly depressed. The umbilical side displays a large, widely open and shallow umbilicus; chambers surface inflated, sutures radial straight and strongly depressed; chambers with extensions of their walls that combine into a funnel-like umbilical plate.
The septal side is inflated, its dimensions varying according to the subspecies.
Ornamentation always present but relatively weak consisting of small round pustules that become bigger towards the periphery even merging into bigger and more irregular protuberances; ornamentation present on the internal whorls and on the 2-3 chambers of the last whorl.
The main aperture is interiomarginal in position, high, large and extending more than half-way from the umbilicus to the spiral side. The aperture is shielded by a well-developed but thin lip, the successive lips fusing into an umbilical plate shaped like a funnel. The supplementary aperture is partly intrasutural in position, usually not high but big and bordered by a weak ridge.
Entries in the Catalog of original descriptions: Ticinella raynaudi, Ticinella raynaudi digitalis, Hedbergella trocoidea yezoana
Character matrix
| test outline: | Lobate | chamber arrangement: | Trochospiral | edge view: | - | aperture: | - |
| sp chamber shape: | Globular | coiling axis: | Low | periphery: | N/A | aperture border: | Thick lip |
| umb chbr shape: | Globular | umbilicus: | Wide | periph margin shape: | Broadly rounded | accessory apertures: | Umbilical |
| spiral sutures: | Moderately depressed | umb depth: | Deep | wall texture: | Finely pustulose | shell porosity: | - |
| umbilical or test sutures: | Moderately depressed | final-whorl chambers: | 6-8 | N.B. These characters are used for advanced search. N/A - not applicable | |||
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): within T. praeticinensis zone (106.98-107.39Ma, base in Albian stage). Data source: [copied from Chronos database]
Plot of range and occurrence data:
References:
 |
Ticinella raynaudi compiled by the pforams@mikrotax project team viewed: 23-1-2025
Short stable page link: https://mikrotax.org/pforams/index.php?id=110558 Go to Archive.is to create a permanent copy of this page - citation notes |
This policy contains information about your privacy. By posting, you are declaring that you understand this policy:
This policy is subject to change at any time and without notice.
These terms and conditions contain rules about posting comments. By submitting a comment, you are declaring that you agree with these rules:
Failure to comply with these rules may result in being banned from submitting further comments.
These terms and conditions are subject to change at any time and without notice.
Comments