''Clavulina'' is a genus of aggulinated benthic
foraminifera
Foraminifera (; Latin for "hole bearers"; informally called "forams") are single-celled organisms, members of a phylum or class of amoeboid protists characterized by streaming granular Ectoplasm (cell biology), ectoplasm for catching food and ot ...
ns with an elongate test. The early stage is triserial and triangular in section, the later stage uniserial and rectilinear, with angular to rounded section. In some species agglutinated walls have considerable calcareous cement. Septa are secondarily doubled as a result of imperforate floors, which are added as new chambers are formed. Walls contain fine bifurcating canaliculi within, openings of which are sealed internally by an inner organic lining, and externally by the imperforate surface layer of the wall. The aperture is interiomarginal in the early triserial stage, terminal and rounded in the adult.
The genus ''Clavulina'' was named by d'Orbigny, 1826. It is included in the
textulariid family,
Valvulinidae
The Valvulinidae is a family of Paleocene to recent benthos, benthic Textulariida, textulariid Foraminifera characterized by trochospiral tests in the early stage which may become uniserial in the later. Walls are of cemented agglutinated material ...
and is cosmopolitan in distribution, with a range extending from the Paleocene to now.
Species
There are many species, extant and extinct, including:
* †''Clavulina alazanensis'' Nuttall, 1932
* †''Clavulina anglica'' Cushman, 1936
* ''
Clavulina angularis'' d'Orbigny, 1826
* ''
Clavulina arenata'' Cushman, 1933
; Names brought to synonymy:
* †''Clavulina antipodum'' Stache, 1864 and †''Clavulina elegans'' Karrer, 1864,
[Karrer, F. (1864). Die Foraminiferen-Fauna des tertiären Grünsandsteines der Orakei-Bay bei Auckland. Reise der Österreichischen Fregatte Novara um die Erde in den Jahren 1857, 1858, 1859 unter den Befehlen des Commodore B. von Wüllerstorf-Urbair. Paläontologie von Neu-Seeland: Beiträge zur Kenntniss der fossilen Flora und Fauna der Provinzen Auckland und Nelson. Novara-Expedition, Geologischer Theil. 1(2): 69-86.] synonyms for †''
Arenodosaria
''Arenodosaria'' is an extinct genus of foraminifera
Foraminifera (; Latin for "hole bearers"; informally called "forams") are single-celled organisms, members of a phylum or class of amoeboid protists characterized by streaming granular Ect ...
antipodum'' (Stache, 1864)
References
*
Joseph A. Cushman
Joseph Augustine Cushman (January 31, 1881 – April 16, 1949) was an American geologist, paleontologist and Foraminifera, foraminiferologist.
Biography
He was born on January 31, 1881 in Bridgewater, Massachusetts, the son of Darius and Jane ( ...
, 1950. Foraminifera, their classification and economic use. Harvard University Press, Cambridge, Massachusetts. Fourth edition, 1950
*
Alfred R. Loeblich Jr
Alfred R. Loeblich Jr (1914–1994) was an American micropaleontologist. He was married to Helen Niña Tappan Loeblich and the two co-authored a number of important works on the Foraminifera and related organisms.
Biography
Alfred R. Loeblich Jr ...
and
Helen Tappan
Helen may refer to:
People
* Helen of Troy, in Greek mythology, the most beautiful woman in the world
* Helen (actress) (born 1938), Indian actress
* Helen (given name), a given name (including a list of people with the name)
Places
* Helen, G ...
, 1964. Sarcodina, chiefly "Thecamoebians" and Foraminiferida.
Treatise on Invertebrate Paleontology
The ''Treatise on Invertebrate Paleontology'' (or ''TIP'') published by the Geological Society of America and the University of Kansas Press, is a definitive multi-authored work of some 50 volumes, written by more than 300 paleontologists, and co ...
, Part C, Protista 2. Geological Society of America and University of Kansas Press, 1964.
Valvulinidaein Loeblich and Tappan, 1988, Foraminiferal genera and their classification.
External links
''Clavulina''at WoRMS
{{Taxonbar, from=Q5129654
Globothalamea
Foraminifera genera
Fossil taxa described in 1826
Extant Paleocene first appearances