Information om | Engelska ordet TROCHOSPIRAL

Exempel på hur man kan använda TROCHOSPIRAL i en mening

• Globigerinids are characterized by distinctly perforate planispiral or trochospiral tests composed of lamellar radial hyaline (glassy) calcite, with typically globular chambers and single interiomarginal aperture.
• The ichnogenus Rhizocorallium Zenker 1836 includes three ichnospecies: Rhizocorallium jenense Zenker 1836 representing straight, short U-shaped spreite-burrows commonly oblique to bedding plane, and only rarely horizontal, Rhizocorallium irregulare Mayer 1954 representing long, sinuous, bifurcating or planispiral U-shaped spreite-burrows, mainly horizontal, and Rhizocorallium uliarense Firtion 1958 representing trochospiral U-shaped spreite-burrows (definitions after Fürsich 1974).
• The test, or shell, of Cibicides, which is commonly found attached, is multichambered, plano-convex, trochospiral, with a flat or dished-out evolute spiral side and a strongly arched, involute umbilical side.
• Discorbis produces a smooth plano-convex to unequally biconvex trochospiral test (shell) with a flattened umbilical side, taking up about two and a half whorls, with seven to ten chambers in the final whorl.
• Hedbergella is an extinct genus of planktonic foraminifera from the Cretaceous, described by Loeblich and Tappan, 1961, as:

  Test free, trochospiral, biconvex, umbilicate, periphery rounded with no indication of keel or poreless margin; chambers globular to ovate; sutures depressed, radial, straight or curved; wall calcareous, finely perforate, radial in structure, surface smooth to hispid or rugose; aperture an interiomarginal, extraumbilical-umbilical arch commonly bordered above by a narrow lip or spatulate flap,.

• The Valvulinidae is a family of Paleocene to recent benthic textulariid Foraminifera characterized by trochospiral tests in the early stage which may become uniserial in the later.
• Globoroatioidea have trochospiral tests with rounded to carinate peripheries, the walls of which are of finely lamellar, perforate, of optically radial calcite, with an inner organic lining.
• Cornuspiracea comprise a superfamily of miliolid forams (Loeblich & Tappan, 1988) in which the test may be free or attached, planispiral or trochospiral, evolute or involute, spreading or discoidal.
• Test are commonly planospiral or trochospiral but may be uniserial to multiserial and are of secreted hyaline (glassy) calcite.
• The test, or shell, may be trochospiral to planispiral throughout, or just in the early part with the later part uncoiled.

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