Siphocampe septata

Taxonomy

Catalog entries: Lithomitrella septata

Original description: Материал. 57 экз. из образцов 337-9-6, 337-11-3, 338-26-3, 338-27-3, 338-29-3, 339-10-3, 340-2-3, 340-3-3, 340-8-3, 340-11-6, 12-112-11-СС. Голотип из образца 340-11-6 хранится (No 68488) в Лабо­ ратории морских исследований ЗИН.
Описание. Апикальный рог и ребра на тораксе выражены слабо. Раковинка сигаровидная. Пережим между тораксом и постторакальной частью отчетливый; стенки последней весьма толстые, часто с внутренними утолщениями, что делает этот вид сходным с неидентифицированной формой, известной (Петрушевская, 1975а, pi. 10, fig. 6, pi. 26, fig. 4) из меловых и палеогеновых отложений Карибского района и субантарктики. Ширина цефалиса 13—18 мкм, высота его (от МВ) около 9 мкм, наибольшая ширина раковинки 25—40 мкм, длина — 60—90 мкм. На постторакальной части 8—13 поперечных рядов пор; по 8—11 пор в ряду на половине окружности. Ряды пор и поры в ряду располагаются на равных расстояниях, но приустьевые ряды могут нарушаться. Продольные ряды пор не выражены. Бороздки слабые, поверхность почти гладкая.
Распространение. Эоцен—ранний олигоцен: Норвежскоеморе.
Примечание. Отличается от L. staihmeporoides отчетливым разделением раковинки на торакс и постторакальную часть, от L. acephala— относительно более длинной раковинкой и отсутствием продольных рядов пор. В тропиках и в районе возвышенности Роколл (образец 48-404-10-СС) встречаются несколько более широкие (40—50 мкм) экземпляры с более резкими пережимами между сегментами, отличающиеся четкими продольными рядами пор. Нигрини (Nigrini, 1977, pi. 3, fig. 6) определяет эти экземпляры как Siphocampe elizabethae (Clark et Campbell), с чем мы не вполне согласны.
Название от septatum (лат.) — перегородчатый.
Translated description: Material. 57 specimens from samples 337-9-6, 337-11-3, 338-26-3, 338-27-3, 338-29-3, 339-10-3, 340-2-3, 340-3-3, 340-8-3, 340-11-6, 12-112-11-SS. The holotype from specimen 340-11-6 is kept (No. 68488) at the Marine Research Laboratory of ZIN.
Description. The apical horn and ribs on the thorax are weakly expressed. The shell is cigar-shaped. The constriction between the thorax and the postthoracic part is distinct; the walls of the latter are very thick, often with internal thickenings, which makes this species similar to an unidentified form known (Petrushevskaya, 1975a, pi. 10, fig. 6, pi. 26, fig. 4) from the Cretaceous and Paleogene deposits of the Caribbean region and subantarctic. The width of the cephalis is 13–18 µm, its height (from MB) is about 9 µm, the maximum width of the shell is 25–40 µm, and its length is 60–90 µm. Postthoracic part with 8-13 transverse rows of pores; 8-11 pores in a row on half a circle. Rows of pores and pores in a row are located at equal distances, but near-mouth rows can be disturbed. Longitudinal rows of pores are not expressed. The grooves are weak, the surface is almost smooth.
Distribution. Eocene-Early Oligocene: Norwegian Sea.
Note. Differs from L. stathmeporoides in a distinct division of the shell into the thorax and postthoracic part, and from L. acephala in a relatively longer shell and the absence of longitudinal rows of pores. In the tropics and in the region of the Rockall Rise (sample 48-404-10-SS), somewhat wider (40–50 µm) specimens with sharper constrictions between segments and distinct longitudinal rows of pores are found. Nigrini (1977, pi. 3, fig. 6) identifies these specimens as Siphocampe elizabethae (Clark et Campbell), with which we do not fully agree.
The name is from septatum (lat.) - cloisonné. [Google Translate]

Description

Biogeography and Palaeobiology

Similar species

Biostratigraphic distribution

Geological Range:
Last occurrence (top): within Early Oligocene Sub-Epoch (28.09-33.89Ma, top in Rupelian stage). Data source: Lazarus et al. 2015 - "P age group"
First occurrence (base): within Eocene Epoch (33.89-55.96Ma, base in Ypresian stage). Data source: Lazarus et al. 2015 - "P age group"

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
• Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
• Taxon plotted: Siphocampe septata, synonyms included - Siphocampe septata;
• See also space-time plot :: Samples map :: Parent: Siphocampe

Siphocampe septata compiled by the radiolaria@mikrotax project team viewed: 29-11-2023 Taxon Search: Advanced Search Short stables page link: https://mikrotax.org/radiolaria/index.php?id=205393 Go to Archive.is to create a permanent copy of this page - citation notes

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