Dicarinella imbricata

Taxonomy

Original description: Diagnosis: Petite coquille à enroulement trochospiral dextrogyre, à face spirale convexe, face ombilicale concave, contour périphérique peu lobé, sauf à la hauteur des deux dernières loges — la dernière seulement chez le cotype — grandes, globuleuses, dépourvues des deux bourrelets carénaux qui ornent les loges précédentes.

French translation: Small shell with a trochospiral, dextral coiling, convex spiral side, concave umbilical side, equatorial periphery slightly lobulate, except for the two last chambers (the last chamber in the paratype) which are large, globular and devoid of the two carinal ridges that ornament the preceding chambers.

Description: Face spirale: 2½ tours, 5 loges au dernier tour, surface des loges plane ou faiblement bombée par rapport aux bourrelets suturaux qui disparaissent dans les deux dernières loges où les lignes de suture occupent une dépression. Bourrelets suturaux granuleux dans les premiers tours, saillants, arqués dans le sens de l'enroulement, rapprochés et presque parallèles grâce à un accroissement lent des loges, tombant tangentiellement sur les tours précédents. Ils se poursuivent par le bourrelet carénai supérieur. La face ombilicale montre des loges trapezoides peu renflées, à lignes suturales droites, radiales, dans des dépressions peu profondes, dépourvues de bourrelets. Bourrelets périombilicaux jamais distincts mais remplacés parfois par des granulations. Le bourrelet carénai inférieur reste strictement périphérique. L'ombilic type possède un étroit replat formé par les prolongements adombilicaux de chaque loge et porte une lèvre ou un liséré continu qui surmonte les ouvertures.

Vue de profil, la position oblique des bourrelets carénaux donne l'aspect de loges imbriquées. Ceux-ci forment, d'abord, comme la tête d'une épingle à cheveu surplombant, à paroi perpendiculaire, la ligne de suture au point de jonction avec le bourrelet inférieur de la loge précédente. De là ils bifurquent: l'inférieur ourle la face ombilicale; l'autre, presque parallèle, borde la face spirale puis se prolonge par le bourrelet suturai. Ainsi, le bandeau carénai est délimité, par rapport à la face spirale de la loge, suivant une simple ligne de suture arquée vers l'arrière.

Entries in the Catalog of original descriptions: Globotruncana imbricata, Globotruncana indica

Geological Range:
Last occurrence (top): within D. concavata zone (85.60-89.75Ma, top in Santonian stage). Data source: [copied from Chronos database]
First occurrence (base): within R. cushmani zone (94.03-98.69Ma, base in Cenomanian stage). Data source: [copied from Chronos database]

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: Dicarinella imbricata, synonyms included - Concavatotruncana imbricata; Dicarinella imbricata; Globotruncana imbricata; Marginotruncana imbricata; Praeglobotruncana imbricata;
• See also space-time plot :: Samples map :: Parent: Dicarinella

Dicarinella imbricata compiled by the pforams@mikrotax project team viewed: 25-4-2025 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/pforams/index.php?id=110091 Go to Archive.is to create a permanent copy of this page - citation notes

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