radiolaria - rads_cenozoic - Lophophaena tekopua radiolaria - rads_cenozoic - Lophophaena tekopua

Lophophaena tekopua


Classification: rads_cenozoic -> Plagiacanthidae -> Lophophaenidae -> Lophophaena -> Lophophaena tekopua
Sister taxa: L. apiculata, L. arctissa, L. arie, L. buetschlii, L. capito, L. circumtexta, L. clevei, L. cylindrica, L. decacantha, L. galeaorci, L. hispida, L. josephinus, L. macrencephala, L. mugaica, L. nadezdae, L. polycyrtis, L. radians, L. rioplatensis, L. sibirica, L. simplex, L. tekopua, L. thaumasia, L. variabilis, L. witjazii, Lophophaenoma, L. sp., Lophophaenoma sp.

Taxonomy

Citation: Lophophaena tekopua O'Connor 1997
taxonomic rank: species
Basionym: Lophophaena tekopua
Synonyms:
1997 Lophophaena tekopua - O'Connor p.73, pl. 2, fig. 11-14; pl. 7, fig. 7-10
Taxonomic discussion: O'Connor 1997

Catalog entries: Lophophaena tekopua

Original description: Cephalis truncate spheroidal, generally rough- surfaced due to overgrowths on pore bars and/or small nodes at pore bar junctions. Pores circular to subcircular. relatively large, irregularly arranged. Two prominent, stout, bladed horns present (both are extensions of internal elements - see below) - apical horn generally curved proximally. extends upward from upper anterior of cephalis: vertical horn straight, generally shorter than apical horn, extends upwards from posterior base of cephalis at 10-20 angle. Collar stricture not always well defined but generally seen as slight constriction. Thorax truncate conical to campanulate, always wider and longer than cephalis. Pores larger than those on cephalis. circular to subangular, roughly arranged in longitudinal rows but irregular in size distribution. Terminates in up to ten bladed feet, irregularly distributed around distal margin. Feet not seen to be associated with any internal elements. Where feet are well developed weak peristome generally apparent in form of narrow, poreless bars between feet, sometimes with weakly developed spines extending downwards from them (pl. 2. figs 11,12; pl. 7, figs. 8, 9). Internal skeleton consists of bars M, D, A, Al, V, LI, Lr, ll1, Ir1, spine Ax and arches A-Ll, A-Lr, V-Ll and V-Lr (text-fig. 6; pl. 7, fig. 10). M very short. Ax reduced to a node. D generally trifurcates before joining thorax, central trifurcation sometimes extends outside thorax as very short wing (pi. 2. figsl 1.12; pi. 7, fig. 9). LI and Lr bi- or trifurcate but do not penetrate thoracic wall. V very thin, extends upward at angle to collar stricture, penetrates to become vertical horn (see above). A extends upward from M to anterior wall of cephalis. continues outside as apical horn (see above). Al branches from A to join shell wall at collar stricture but does not penetrate outside. From approximately same point as A. A-Ll and A-Lr extend downward and join to LI and Lr at thoracic wall. Bars ll1 and Ir1 join, but do not penetrate, shell wall at collar stricture. V-Ll and V-Lr extend downward along inner wall from V at collar stricture and join to LI and Lr respectively. Arches A-Ll, A-Lr, V-Ll and V- Lr may create externally visible furrows (pl. 7, fig. 9).

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

Geological Range:
Last occurrence (top): within Paleogene Period (23.03-66.04Ma, top in Chattian stage). Data source: Lazarus et al. 2015 - "P age group"
First occurrence (base): within Paleogene Period (23.03-66.04Ma, base in Danian stage). Data source: Lazarus et al. 2015 - "P age group"

Plot of occurrence data:

References:

O'Connor, B. (1997b). New Radiolaria from the Oligocene and early Miocene of Northland, New Zealand. Micropaleontology. 43(1): 63-100. gs


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Lophophaena tekopua compiled by the radiolaria@mikrotax project team viewed: 22-7-2024

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Short stable page link: https://mikrotax.org/radiolaria/index.php?id=204615 Go to Archive.is to create a permanent copy of this page - citation notes



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