Amphiplecta tripleura


Classification: rads_cenozoic -> Plagiacanthidae -> Lophophaenidae -> Amphiplecta -> Amphiplecta tripleura
Sister taxa: A. acrostoma, A. amphistoma, A. cylindrocephala, A. satoshii, A. tripleura, A. sp.

Taxonomy

Citation: Amphiplecta tripleura Funakawa 1995
Rank: species
Basionym: Amphiplecta tripleura Funakawa 1995
Synonyms:

Amphiplecta sp.; Petrushevskaya, 1971b, pi. 54, fig. 1

Catalog entries: Amphiplecta tripleura

Original description:

Shell is composed of two segments. Internal skeletal structure is composed of A, MB, D, two L, V, two AL, two D-AL, two VL and A'. A' formsA-(D-AL). L-R is absent. V is thinner than the other internai spicules. Two L-Rd are short. A forms a long apical rib and a short apical horn. V forms a ventral horn. D and two L are well developed and form three dorsal and lateral ribs. First segment is cylindrical with long and distinct apical rib extending to apical horn. Apical horn is not bladed, short and narrow. Ventral horn is not bladed and extends obliquely upward. Its length is one to two times that of apical horn. A' is well-developed and diverges from A at the junction of A and A L . A' forms A-(D-AL); it shifts a little to right or left side from the piane of bilateral symmetry and so it connects with D-AL at near the junction with D (Piate 1, figs. le, 3b). Axial projection is distinct. Pores in the first segment are circular to subcircular and are not aligned. Pore bars are very thin. First segment is distinguished from second segment by two VL, a part of both two AL and two D-AL. Two D-AL are distinct. On the underside of both L and D,there are two or three small and irregularly arranged projections (Piate 1, figs. lb, le). On the lateral side of A, there are one to two pairs of trigonal projections (Piate 1, fig. le). There are a pair of lateral projections (1 ?) on D that are trigonal to thorny (Piate 1, figs. lb, 2). Second segment is expanded horizontally. In most specimens, lateral and dorsal ribs are indistinct. Three feet are not developed. Pores in the second segment are circular to subcircular and not aligned and pore bars are very thin. Distai end of the second segment is fully open.

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

Geological Range:
Last occurrence (top): within Early Miocene Sub-Epoch (15.97-23.03Ma, top in Burdigalian stage). Data source:
First occurrence (base): within Early Miocene Sub-Epoch (15.97-23.03Ma, base in Aquitanian stage). Data source:

Plot of occurrence data:

References:


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Amphiplecta tripleura compiled by the radiolaria@mikrotax project team viewed: 19-4-2021

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