Lithamphora

Daughter taxa (time control age-window is: 0-800Ma)
				Lithamphora sacculifera neptune records:
				Lithamphora sp. neptune records: 1

Taxonomy

Catalog entries: Lithamphora

Original description: Dem Genus Poroamphora schließt sich das gleichfalls neue Genus Lithamphora dicht an. In der äußeren Form sind auch diese Stichocyrtida Vertreter der Lithocampidae. Wie bei Poroamphora findet sich im innern der vier- oder mehrteiligen Schale ein inneres Stachelgerüst, dessen einzelne Stacheln mir bisher noch nicht mit ausreichender Genauigkeit gelang zu identifizieren, da die Schale und der Weichkörper bei den bisher beobachteten Individuen nicht durchsichtig genug waren. Eine Untersuchung durch Entfernen der entsprechenden Schalenteile war ausgeschlossen, da die Tiere schon in Kanadabalsam eingeschlossen waren. Soviel steht jedoch fest, daß ein aufwärtsstrebender am Kopf als Höcker hervortretender Dorsalstachel vorhanden ist und zwei Apikalstachel, die jedoch im oberen Teil zusammenfließen in einen Ast, der, wie im Genus Poroamphora, in der Mitte des ersten Abdominalringes in der Schale mündet. Wegen dieses im unteren Teil gablig gespaltenen Apikalstachels, der in vielen anderen Arten, welche ihn besaßen, stets einfach war wurde für die einzige folgende Art ein neues Genus unter obigem Namen eingerichtet. Betreffs der übrigen Stacheln,des inneren Gerüstes will es mir scheinen, als ob außer dem gabligen Apikalstachel die übrigen Stacheln vorhanden sind, also auch zwei Lateral-, ein Ventralstachel, ein Dorsalstachel (letzterer wurde sicher festgestellt).
Die beobachteten Exemplare waren zum Teil Entwicklungsstadien, eins schien jedoch mit der Schalenbildung abgeschlossen zu haben, und zwar besaß das Tier anscheinend eine unten geschlossene Schale.

Translated description: The new genus Lithamphora is close to the genus Poroamphora. By their external shape, these Stichocyrtida are also representatives of the Lithocampidae. As in Poroamphora, there is an internal spicule inside the four-, and more, segmented shell, that I have been unable, until now, to recognize precisely, because the shell and cytoplasm were not sufficiently transparent in the specimens observed. A more precise observation by removal of some parts of the shell was impossible as specimens were already included into Canada Balsam. Anyway, a dorsal spine upwardly directed protrudes above the cephalis, and two apical spines, that are linked, on their superior part, in a single branch end, as in Poroamphora, on the middle of the first of the abdominal segment. It is because of this branched apical spine, that remains simple in many other species, that this new genus was erected with a single species. It seems that the other spines of the internal spicule (in case they would be different from the furcate apical spine) would include two lateral, a ventral and a dorsal spine (this last one should be more easily recognizable). Most of the observed specimens were development stages, one of them seemed, however, to have a fully developed shell with a closed lower part. (In German. Translation by J.P.C.)]

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

Geological Range:
Last occurrence (top): at top of (100% up, 0Ma, in "Holocene" stage). Data source: Total of ranges of the species in this database
First occurrence (base): within (-Ma, base in "Holocene" stage). Data source: Total of ranges of species in this database

Plot of 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
• Neptune data: This is a higher taxon page so Neptune data is not plotted. See also: customisable plot Parent: Artostrobiidae

Lithamphora compiled by the radiolaria@mikrotax project team viewed: 8-9-2024 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/radiolaria/index.php?id=204455 Go to Archive.is to create a permanent copy of this page - citation notes

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