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Nematosphaeropsis scala
Nematosphaeropsis scala Duxbury, 1977
Holotype: Duxbury, 1977, pl. 9, fig. 2
Locus typicus: Speeton, England
Stratum typicum: Valanginian-Hauterivian
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G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Nematosphaeropsis scala Duxbury, 1977, has an ovoidal to spheroidal central body with long gonal and sutural processes, connected by low sutural ridges and which are distally widely flared and fenestrate. Each gonal process is connected to three neighbouring processes by distal trabeculae and each sutural process to two. These trabeculae are formed of two thin, parallel strands which are connected at various points along their length either by lateral fusion or by short cross-strands. Size: overall 69-94 x 66-86
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Original diagnosis: Duxbury, 1977, p. 43
A chorate cyst. The main body is ovoidal to spheroidal and the endophragm and periphragm are closely appressed, except along body sutures where fairly long processes are developed. These processes are proximally connected by low sutural ridges and sre distally widely flared and fenestrate. Each gonal process is connected to three neighbouring processes by distal trabeculae and each sutural process to two. These trabeculae are formed of two thin, parallel strands which are connected at various points along their length either by lateral fusion or by short cross-strands.
Observed Dimensions: Holotype 86 x 86 Ám. Overall 94(80)69 x 86(75)66 Ám.
Affinities:
Duxbury, 1977, p. 43: The trabecular connections which are the characteristic feature of this species are seen entire only in well-preserved specimens. Commonly, the trabeculae are partially broken and sometimes are completely destroyed leaving the nevertheless distinctive widely flared and fenestrate processes. In some respects, Nematosphaeropsis scala resembles Spiniferites ramosus ssp. primaevus n. ssp., particularly in the tendency of the latter to have some perforation of the process terminations and some cross-connection between terminal spines in each process.
Holotype: Duxbury, 1977, pl. 9, fig. 2
Locus typicus: Speeton, England
Stratum typicum: Valanginian-Hauterivian
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G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Nematosphaeropsis scala Duxbury, 1977, has an ovoidal to spheroidal central body with long gonal and sutural processes, connected by low sutural ridges and which are distally widely flared and fenestrate. Each gonal process is connected to three neighbouring processes by distal trabeculae and each sutural process to two. These trabeculae are formed of two thin, parallel strands which are connected at various points along their length either by lateral fusion or by short cross-strands. Size: overall 69-94 x 66-86
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Original diagnosis: Duxbury, 1977, p. 43
A chorate cyst. The main body is ovoidal to spheroidal and the endophragm and periphragm are closely appressed, except along body sutures where fairly long processes are developed. These processes are proximally connected by low sutural ridges and sre distally widely flared and fenestrate. Each gonal process is connected to three neighbouring processes by distal trabeculae and each sutural process to two. These trabeculae are formed of two thin, parallel strands which are connected at various points along their length either by lateral fusion or by short cross-strands.
Observed Dimensions: Holotype 86 x 86 Ám. Overall 94(80)69 x 86(75)66 Ám.
Affinities:
Duxbury, 1977, p. 43: The trabecular connections which are the characteristic feature of this species are seen entire only in well-preserved specimens. Commonly, the trabeculae are partially broken and sometimes are completely destroyed leaving the nevertheless distinctive widely flared and fenestrate processes. In some respects, Nematosphaeropsis scala resembles Spiniferites ramosus ssp. primaevus n. ssp., particularly in the tendency of the latter to have some perforation of the process terminations and some cross-connection between terminal spines in each process.