Page 225 - Introduction to Paleobiology and The Fossil Record

212 INTRODUCTION TO PALEOBIOLOGY AND THE FOSSIL RECORD

Box 9.2 Classifi cation of Foraminifera

Suborder ALLOGROMIINA

• Organic tests, usually unilocular, occurring in fresh, brackish and marine conditions. Not usually
fossilized
• Cambrian (Lower) to Recent
Suborder TEXTULARIINA
• Agglutinated tests consist of debris bound together with cement; both septate and non-septate
• Cambrian (Lower) to Recent
Suborder FUSULININA
• Microgranular tests, some with two or more laminae; septate and non-septate forms
• Ordovician (Llandeilo) to Permian (Changhsingian)
Suborder INVOLUTININA
• Aragonitic hyaline tests
• Permian (Rotliegendes) to Cretaceous (Cenomanian)
Suborder SPIRILLININA
• Calcitic hyaline tests, planispiral to conical
• Triassic (Rhaetic) to Recent

Suborder CARTERININA
• Tests comprise calcareous spicules in calcareous cement
• Tertiary (Priabonian) to Recent

Suborder MILIOLINA
• Porcellaneous tests, imperforate, both septate and non-septate, which are often large and
complex
• Carboniferous (Viséan) to Recent
Suborder SILICOLOCULININA
• Imperforate tests of opaline silica
• Tertiary (Miocene) to Recent
Suborder LAGENINA
• Calcitic monolamellar tests, hyaline radial
• Silurian (Prídolí) to Recent
Suborder ROBERTININA
• Aragonitic, hyaline radial tests; both septate and fi nely perforate
• Triassic (Anisian) to Recent
Suborder GLOBIGERININA
• Calcitic, hyaline tests; finely perforate planktonic forms

• Jurassic (Bajocian) to Recent
Suborder ROTALIINA
• Calcitic, hyaline radial; perforate multilocular forms
• Jurassic (Aalenian) to Recent