CATALOG OF ORIGINAL DESCRIPTIONS: Trimiduca Kozur & Mostler 1979

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Higher levels: rads_cat -> T -> Trimiduca
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Trimiduca

Citation: Trimiduca Kozur & Mostler 1979
Rank: genus
Described on page(s) : 180

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Current identification/main database link:


Original Description
Große, mehrschichtig-spongiose Scheibe mit sechs distal verbreiterten und abrupt endenden Armen mit nadelförmigen Zentralstacheln und kurzen Randstacheln. Poren unregelmäßig angeordnet, in Zentrum des Scheibeninneren konzentrische Porenanordnung (? winzige Markschale).


Translation: Large disc of numerous spongious layers and six distally widening and abruptly ending arms with needle-shaped central spines and short marginal spines. Pores irregularly distributed, inside the central part of the disc, pores pores in concentric rows (very small medullary shell ?). (In German. Translation by J.P.C.)]

Etymology: Anagram of P. Dumitrica, to honour his important contribution to the study of radiolarians.

Editors' Notes
Die größte morphologische Ähnlichkeit besteht zu Natraglia Pessagno, 1979, die ebenfalls sechs spongiöse Arme besitzt. Diese haben aber mehr das Aussehen von Ausbuchtungen der Zentralscheibe, so daß Natraglia Pessagno, 1979, ein sternförmiges Aussehen erhält, wobei die Arme mit breiter Basis beginnen und distal spitz auslaufen. Inwieweit beide Gattungen Überhaupt näher miteinander verwandt sind, müssen detaillierte Untersuchungen des wenig bekannten Innenbaus bei Trimiduca n.gen. und des unbekannten Innenbaus bei Natraglia Pessagno, 1979, klären. Hagiastrum Haeckel, 1881a, emend. Pessagno, 1971 und Rhopalodictyum Ehrenberg, 1860b, emend. Kozur and Mostler, 1978, unterscheiden sich durch die abweichende Anzahl der Arme (vier bzw. drei) und die wesentlich kleinere Zentralscheibe, stimmen aber sonst völlig überein, so daß trotz der morphologischen Unterschiede beide Gattungen eng mit Trimiduca n.gen. n.sp. verwandt sind.

[Very similar to Natraglia Pessagno, 1979, that has also six spongious arms. However, these arms seem to be more like a bulge of the central disc, so that Natraglia Pessagno, 1979, looks more like a star with arms widened at their base and distally tapering. Before understanding at which point both genera are allied, it is necessary to have detailed descriptions of the not-well known inner structure of Trimiduca n.gen. and the unknown inner structure of Natraglia Pessagno, 1979. Hagiastrum Haeckel, 1881a, emend. Pessagno, 1971 and Rhopalodictyum Ehrenberg, 1860b, emend. Kozur and Mostler, 1978, differ by a different number of arms (respectively four and three) and considerably smaller central discs, but otherwise are so close that their morphological differences with Trimiduca n.gen. n.sp. are not significant.

Stratigraphic range:Cordevolian, Early Carnian, Late Triassic.

References:

Kozur, H. & Mostler, H. (1979b). Eine neue Radiolariengattung aus dem hoheren Cordevol (Unterkarn) von Gostling (Osterreich). Geologisch-Paläontologische Mitteilungen Innsbruck. 9(4): 179-181. gs


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Trimiduca compiled by the radiolaria@mikrotax project team viewed: 26-11-2020

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