radiolaria - rads_cat - Plectodiscus radiolaria - rads_cat - Plectodiscus

CATALOG OF ORIGINAL DESCRIPTIONS: Plectodiscus Kozlova, Petrushevskaya & Kozlova 1972

This page provides data from the catalog of type descriptions. The catalog is sorted alphabetically. Use the current identification link to go back to the main database.

Higher levels: rads_cat -> P -> Plectodiscus
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Plectodiscus runanganus O'Connor 1999

Plectodiscus totschilinae Kozlova 1984


Citation: Plectodiscus Kozlova, Petrushevskaya & Kozlova 1972
taxonomic rank: genus
Type species: Porodiscus circularis Clark & Campbell 1942 ?
Described on page(s) : 526

Current identification/main database link: Plectodiscus Kozlova in, Petrushevskaya & Kozlova 1972

Original Description

Thin, biconvex skeleton, with oval, less frequently circular outline, consisting of frontal, equatorial, and sagittal girdles. The closed-spiral structure of girdles is of the Spironium type: wings of the same type of girdle form a one-half turn of the spiral, and at the point of their junction overlap each other. Fist system has fully developed girdles, its dimensions are 40-50µm; in the rest of the girdles only the equatorial girdle is fully developed, both sagittal and frontal girdles terminating at the point of their junction with the previous system. Distance between rings is greater than is the diameter of the central chamber. Inner spines are indistinct; rim of the disc is smooth or is covered by numerous short spines.

Depending on the degree of inclination of the plane of the girdles in relation to the main axes of the skeleton, the equatorial girdles appear from the surface (rest of girdles in corresponding cross-section) in the form of rings, as a single or double spiral, or in the form of rings connected by zigzag radial lines.

From the Greek plekta = interlacing, and discos = disc.


Petrushevskaya, M. G. & Kozlova, G. E. (1972). Radiolaria: Leg 14, Deep Sea Drilling Project. Initial Reports of the Deep Sea Drilling Project. 14: 459-648. gs O


Plectodiscus compiled by the radiolaria@mikrotax project team viewed: 25-6-2024

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