CATALOG OF ORIGINAL DESCRIPTIONS: Stichomitra compsa Foreman 1968
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Citation: Stichomitra compsa Foreman 1968Taxonomic rank: speciesDescribed on page(s) : p.72Type specimens: pl.8, figs.8a, bType age (chronostrat): Late Cretaceous, Mesozoic.Type locality: LL10; LL459; LL460; LL461; LL463Type repository: Holotype USNM 158008, 036/1 and paratype USNM 158009, N38/3 , U.S. National Museum, Washington, D.C.Repository city: Washington
Current identification:
Original Description Shell of six to eleven segments, conical except for last one or two segments which narrow. No complete specimen has been seen, but there is some indication that the last segment constricts to form a short tube. Cephalis with few scattered pores and tiny apical and vertical horns. On some specimens a dorsal branch from the apical spine forms a tiny dorsal horn. Internally, apical spine is free, and there are two tiny jugular pores in addition to the four larger collar pores. Weak paired ridges extend along the cephalic wall from apical spine to sides of vertical spine. Cephalis markedly elliptical in cross section, broad in lateral plane. Thoracic pores small, circular, irregularly spaced. Abdominal segments, except for the first, mostly uniform in length, or increase only very slightly distally. Pores vary considerably among specimens but are rather uniform on individual specimens. They vary from small, circular, widely spaced, very uniform, quincuncially arranged with little or no tendency towards transverse alignment, and surrounded by no or very low nodes or spines, and very rarely with some pores subdivided; to large, circular to subcircular, more closely spaced, less uniform, quincuncially arranged in transverse rows, and surrounded by blunt angular frames or nodes. Very rarely surface spines are longer, branch and join to form a partial rough lattice. Pores of adjoining segments generally apposed, sometimes coalesced. Median segments generally with three to five rows of pores. Size: Length of seven segments 150-75µ, of longest broken specimen (ten segments plus fragment) 267µ, of widest segment 25-40µ; greatest width 70-110µ. Dimensions based on twenty-five specimens. Etymology: No information given Extra details from original publication Distinguishing features: Variation in pore size and surface ornamentation is very great; as all degrees of intergradation are present it does not seem wise to subdivide this species on these bases. This species differs from Lithocampe obesa Squinabol (1903) and from Dictyomitra f
References:
Foreman, H. P. (1968). Upper Maestrichtian Radiolaria of California. Special Papers in Palaeontology. 3: 1-82. gs
Stichomitra compsa compiled by the radiolaria@mikrotax project teamviewed: 25-6-2025
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Stichomitra compsa Foreman 1968.jpg
Stichomitra compsa Foreman 1968.jpg
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