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Endoscrinium pharo
Endoscrinium pharo Duxbury, 1977
Originally (and now) Endoscrinium, subsequently Scriniodinium.
Davey, 1982, transferred this species to Scriniodinium Klement, 1957.
Jan du Chene et al., 1986, agreed with Davey, 1982. Lentin and Williams, 1985, 1989, retained the species in Endoscrinium.
Holotype: Duxbury, 1977, pl.9, fig.5; Jan du Chene et al., 1986, pl.111, figs.11-12
Locus typicus: Speeton, England
Stratum typicum: Berriasian-Valanginian
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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.
Endoscrinium pharo Duxbury, 1977, is thin-walled, fairly large, cavate. Periblast smooth to finely granular and apically produced into characteristically long, distally open horn, which tapers towards the apex. Endoblast smooth ovoidal, longer than broad and with a prominent, bluntly-rounded apical protuberance. A faint tabulation in outline on the periblast by narrow, low, smooth ridges. Tabulation ?4', 6", 5"’, ?1pv, ?”“. Sometimes there is an additional opening in the periblast, which may correspond to 1pv. Archeopyle precingular. This species differs from E.campanula is in the development of the apical horn. That of E.pharo is always well developed (usually about 40 µm long) as opposed to the short horn of E.campanula. The difference in horn length between these two species results in a considerable difference in the average overall length of the test. Size: overall 90 to 141 x 57 to 78 µm
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Original diagnosis: Duxbury, 1977, p. 32
A thin-walled, fairly large, cavate cyst. Periblast smooth to finely granular and apically produced into a characteristically long, distally open horn which tapers towards the apex. Endoblast smooth, ovoidal, longer than broad and with a prominent, bluntly-rounded apical prominence. A faint tabulation is outlined on the periphragm by narrow, low, smooth ridges. Tabulation ?4', 6", 5''', ?1pv, ?''''. Archeopyle precingular, formed by loss of plate 3". Sometimes an additional opening occurs in the periphragm, possibly corresponding to 1 pv.
Dimensions: Holotype 119x70 Ám. Overall 141(121)90x78(70)57 Ám.
Affinities: Duxbury, 1977, p. 32
In possessing a distinct apical horn and in the general shape of the test other than the apical horn, Endoscrinium pharo resembles Endoscrinium campanula (Gocht) Vozzhennikova. The main difference between the two is the degree of dvelopment of the apical horn. That of E. pharo is always very well-developed (usually about 40 Ám long) as opposed to the short horn of E. campanula. The difference in horn length between these two species results in a considerable difference in the average overall length of the test.
Originally (and now) Endoscrinium, subsequently Scriniodinium.
Davey, 1982, transferred this species to Scriniodinium Klement, 1957.
Jan du Chene et al., 1986, agreed with Davey, 1982. Lentin and Williams, 1985, 1989, retained the species in Endoscrinium.
Holotype: Duxbury, 1977, pl.9, fig.5; Jan du Chene et al., 1986, pl.111, figs.11-12
Locus typicus: Speeton, England
Stratum typicum: Berriasian-Valanginian
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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.
Endoscrinium pharo Duxbury, 1977, is thin-walled, fairly large, cavate. Periblast smooth to finely granular and apically produced into characteristically long, distally open horn, which tapers towards the apex. Endoblast smooth ovoidal, longer than broad and with a prominent, bluntly-rounded apical protuberance. A faint tabulation in outline on the periblast by narrow, low, smooth ridges. Tabulation ?4', 6", 5"’, ?1pv, ?”“. Sometimes there is an additional opening in the periblast, which may correspond to 1pv. Archeopyle precingular. This species differs from E.campanula is in the development of the apical horn. That of E.pharo is always well developed (usually about 40 µm long) as opposed to the short horn of E.campanula. The difference in horn length between these two species results in a considerable difference in the average overall length of the test. Size: overall 90 to 141 x 57 to 78 µm
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Original diagnosis: Duxbury, 1977, p. 32
A thin-walled, fairly large, cavate cyst. Periblast smooth to finely granular and apically produced into a characteristically long, distally open horn which tapers towards the apex. Endoblast smooth, ovoidal, longer than broad and with a prominent, bluntly-rounded apical prominence. A faint tabulation is outlined on the periphragm by narrow, low, smooth ridges. Tabulation ?4', 6", 5''', ?1pv, ?''''. Archeopyle precingular, formed by loss of plate 3". Sometimes an additional opening occurs in the periphragm, possibly corresponding to 1 pv.
Dimensions: Holotype 119x70 Ám. Overall 141(121)90x78(70)57 Ám.
Affinities: Duxbury, 1977, p. 32
In possessing a distinct apical horn and in the general shape of the test other than the apical horn, Endoscrinium pharo resembles Endoscrinium campanula (Gocht) Vozzhennikova. The main difference between the two is the degree of dvelopment of the apical horn. That of E. pharo is always very well-developed (usually about 40 Ám long) as opposed to the short horn of E. campanula. The difference in horn length between these two species results in a considerable difference in the average overall length of the test.