radiolaria - rads_cenozoic - Phormostichoartus doliolum

Phormostichoartus doliolum


Classification: rads_cenozoic -> Artostrobiidae -> Phormostichoartus -> Phormostichoartus doliolum
Sister taxa: P. caryoforma, P. corbula, P. crustula, P. doliolum, P. fistula, P. furcaspiculata, P. marylandicus, P. multiseriatus, P. pitomorphus, P. platycephala, P. schneideri, P. strongi, P. sp.

Taxonomy

Citation: Phormostichoartus doliolum Riedel and Sanfilippo 1971
Rank: species
Basionym: Phormostichoartus doliolum
Taxonomic discussion: (Riedel and Sanfilippo) 1971 p.1599 pl.1H figs.1-3; pl.8 figs.14-15 as Artostrob; Nigrini 1977 p.252 pl.1 fig.14

Catalog entries: Artostrobium doliolum

Original description: Spindle-shaped, four-segmented artostrobiid in which the intersegmental strictures are not strongly pronounced externally. Cephalis very small, spherical bearing a lateral tube that lies along the thoracic wall and is thus directed obliquely downward. Thorax and third segment truncate-conical; fourth segment the widest, tapering distally, in some specimens with a poreless peristome. All post-cephalic segments with pores in closely-spaced transverse rows.

[Based on 30 specimens]. Total length 95 to 150µm. Maximum breadth 75 to 100µm (usually about 85µm). Distinguishing characters (rw): This species differs from all described members of the family in the broadly spindle-shaped form of the four-segmented shell, without very pronounced external strictures. Phylogeny (rw): It apparently developed from a form with less developed third segment, more widely separated rows of pores and somewhat more pronounced intesegmental strictures (Plate 1H, Figure 4; Plate 2I, Figures 1-8; Plate 3E, Figures 7-9) as we are not yet sure of the phylogenetic development of this form, its assignment to the genus Artostrobium is arbitrary.

Description


Morphology:


Size:

Biogeography and Palaeobiology

Biostratigraphic distribution

Geological Range:
Last occurrence (top): within Neogene Period (2.59-23.03Ma, top in Piacenzian stage). Data source: Lazarus et al. 2015 - "N age group"
First occurrence (base): within Neogene Period (2.59-23.03Ma, base in Aquitanian stage). Data source: Lazarus et al. 2015 - "N age group"

Plot of occurrence data:

References:

Nigrini, C. A. (1977). Tropical Cenozoic Artostrobiidae (Radiolaria). Micropaleontology. 23(3): 241-269. gs

Riedel, W. R. & Sanfilippo, A. (1971). Cenozoic Radiolaria from the western tropical Pacific, Leg 7. Initial Reports of the Deep Sea Drilling Project. 7: 1529-1666. gs


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Phormostichoartus doliolum compiled by the radiolaria@mikrotax project team viewed: 30-9-2022

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