Globigerina


Globigerina (/ɡlˌbɪəˈrnə/) is a genus of planktonic Foraminifera, in the order of Rotaliida.[1] It has populated the world's oceans since the Middle Jurassic.

Globigerina
Temporal range: Middle Jurassic - Recent.
Illustration of Globigerina ooze
Scientific classification
Clade: SAR
Phylum: Foraminifera
Class: Globothalamea
Order: Rotaliida
Suborder: Globigerinina
Superfamily: Globigerinoidea
Family: Globigerinidae
Subfamily: Globigerininae
Genus: Globigerina
d'Orbigny, 1826

Globigerina ooze


Vast areas of the ocean floor are covered with Globigerina ooze, dominated by the foraminiferous shells of Globigerina and other Globigerinina. The name was originally applied to mud collected from the bottom of the Atlantic Ocean when planning the location of the first transatlantic telegraph cables and it was mainly composed of the shells of Globigerina bulloides.[2]

Description


Globigerina has a globose, trochospirally enrolled test composed of spherical to ovate but not radially elongate chambers that enlarge rapidly as added, commonly with only three to five in the final whorl. The test (or shell) wall is calcareous, perforate, with cylindrical pores. During life the surface has numerous long slender spines that are broken on dead or fossil shells, the short blunt remnants resulting in a hispid surface. The aperture a high umbilical arch that may be bordered by an imperforate rim or narrow lip. No secondary apertures.

Species


Globigerina includes the following species (extinct species marked with a dagger, †)

  • Globigerina bulloides d'Orbigny, 1826
  • Globigerina compacta Hofker, 1956
  • Globigerina cretacea d'Orbigny, 1840
  • Globigerina dubia Egger, 1857
  • Globigerina falconensis Blow, 1959
  • Globigerina hexagona Natland, 1938
  • Globigerina paratriloculinoides Hofker, 1956
  • Globigerina paravenezuelana Hofker, 1956
  • Globigerina protoreticulata Hofker, 1956
  • Globigerina pseudocretacea Hofker, 1956
  • Globigerina stainforthi Hofker, 1956
  • Globigerina supracretacea Hofker, 1956

References


  1. Globigerina, World Foraminifera Database, accessed 3 December 2018
  2. John Murray and A. F. Renard (1891). Report of the Scientific Results of the Voyage of H.M.S. Challenger During the Years 1873–76 — Report on the Deep-Sea Deposits based on the Specimens Collected during the Voyage. London: Her Majesty's Stationery Office. p. 213. Retrieved April 5, 2013.
  • Alfred R. Loeblich Jr. and Helen Tappan, 1964. Sarcodina Chiefly "Thecamoebians" and Foraminiferida; Treatise on Invertebrate Paleontology, Part C Protista 2. Geological Society of America and University of Kansas Press.
  • Alfred R. Loeblich Jr. and Helen Tappan, 1988. Forminiferal Genera and their Classification. . GSI E-book