CATALOG OF ORIGINAL DESCRIPTIONS: Pterocodon anteclinata Foreman 1975

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 -> Pterocodon -> Pterocodon anteclinata
Other pages this level: P. anteclinata, P. apis, P. campana, P. campanella, P. davisianus, P. favosus, P. lex, P. ornatus, P. poculum, P. tenellus

Pterocodon anteclinata

Citation: Pterocodon anteclinata Foreman 1975
Rank: species
Type specimens: pl.9, figs.32-34
Described on page(s) : p.621
Family (traditional): Theoperidae
Family (modern): Theocotylidae

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Current identification/main database link: Pterocodon anteclinata Foreman 1975


Original Description
Shell small, of four segments, subcylindrical to spindle-shaped. The small subspherical porous cephalis bears a slender, relatively long horn and an upward directed vertical pore. The two post-cephalic segments are smooth without external segmental division and have rounded pores arranged quincuncially in transverse diagonal rows. Only small fragments of the third post-cephalic segment have been observed.

Based on 10 specimens. Length of first three segments including horn 125-140 µ (majority 125-130 µ). Width of abdomen 60-80 µ (majority 60-70 µ). Distinguishing characters (rw): Pterocodon ? anteclinata is distinguished from Buryella clinata by possessing a roughened cylindrical horn (rather than a well-developed, heavily ridged bladed horn) which encloses the cephalis at its base. In P. ? anteclinata the thorax is subhemispherical and longer than in B. clinata, and the abdomen subcylindrical rather than inflated. It is distinguished from P. ampla in having four segments rather than three, and by not having a distinct internal septum at the lumbar stricture. (Sanfilippo, unpublished) Phylogeny (rw): Origin unknown; ancestor of Buryella clinata.

Etymology: Latin ante- + clinatus -a -um = formerly tilted

Editors' Notes
Early forms have the horn cylindrical with a roughened blunt tip or roughened overall. This gradually becomes conical, sharper, basally ridged with, in late forms, the ridges beginning to extend onto the cephalis. In late forms also, the thorax becomes relatively shorter and the abdomen more inflated, barrel-shaped. When the horn becomes pointed, completely ridged with well-developed ridges extending down to the base of the cephalis so that the change in contour from the cephalis to the horn is obscure and the abdomen is inflated, barrel-shaped, this species passes over to Buryella clinata. (Foreman, 1975)

References:

Foreman, H. P. (1975). Radiolaria from the North Pacific, Deep Sea Drilling Project, Leg 32. Initial Reports of the Deep Sea Drilling Project. 32: 579-676. gs


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Pterocodon anteclinata compiled by the radiolaria@mikrotax project team viewed: 1-3-2021

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