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Lagenorhytis delicatula
Lagenorhytis delicatula (Duxbury, 1977, p.49, pl.12, figs.1-2,4-5; text-fig.18) Duxbury, 1979b, p.587. Emendation: Piasecki, 1984, p.149-150, as Lagenorhytis delicatula.
Originally Speetonia (an illegitimate generic name), subsequently (and now) Lagenorhytis.
Holotype: Duxbury 1977, pl.12, fig. 4
Paratypes: Duxbury 1977, pl.12, figs.1, 2 and 5
Locus typicus: Speeton, England
Stratum typicum: 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.
Lagenorhytis delicatula Duxbury, 1979b, emend. Piasecki, 1984, as emended by Piasecki (1984), thin-walled, proximate cysts of spherical to ovoidal shape. A hollow, apical protuberance or a strong apical horn is typically well developed. The wall is single layered (autophragm) and without internal structures. The surface is smooth to finely to coarsely granular. Small tubercles may occur scattered on the surface. Granules or tubercles may be concentrated at the apex. The compound archeopyle is of type 2P, probably equivalent to paraplates 3" and 4". One plate is detached (3"), the 4" is generally attached. No cingulum, sulcus or paratabulation is reflected by the morphology except for the shape of the archeopyle. Size: length 75-118 µm, width 61-103 µm.
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Original diagnosis: Duxbury, 1977, p. 49: Speetonia delicatula
A thin-walled proximate cyst. Test spheroidal to ovoidal, produced into a strong, broadbased projection. The body surface displays no tabulation except for a large, precingular archeopyle formed by the loss of two plates. Body finely to coarsely granular and usually covered by an apparently random scatter of small tubercles. The tip of the apical projection sometimes bears a small, irregular terminal structure.
Observed Dimensions: Holotype 88x73 Ám. Overall 118(95)75x103(82)61 Ám.
Emended diagnosis Piasecki, 1984, p.149-150:
Thin-walled, proximate cysts of spherical to ovoidal shape. A hollow, apical protuberance or a strong apical horn is typical well developed. The wall is single layered (autophragm) and without internal structures. The surface is smooth to finely to coarsely granular. Small tubercles may occur scattered on the surface. Granules or tubercles may be concentrated at the apex. The compound archaeopyle is of type 2P. probably equivalent to paraplates 3" and 4". One plate is detached (3"), the other (4") generally attached. No cingulum, sulcus or paratabulation is reflected by the morphology except for the shape of the archaeopyle.
Remark:
Duxbury, 1977, p. 49: Speetonia delicatula
Well-preserved specimens of Speetonia delicatula are rare. Usually, the body is folded or broken to some extent. Nevertheless, the large, unornamonted test (except for small tubercles) and two-plate precingular archeopyle are usually very distinctive.
Originally Speetonia (an illegitimate generic name), subsequently (and now) Lagenorhytis.
Holotype: Duxbury 1977, pl.12, fig. 4
Paratypes: Duxbury 1977, pl.12, figs.1, 2 and 5
Locus typicus: Speeton, England
Stratum typicum: Valanginian
--------------------------------------------------
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Lagenorhytis delicatula Duxbury, 1979b, emend. Piasecki, 1984, as emended by Piasecki (1984), thin-walled, proximate cysts of spherical to ovoidal shape. A hollow, apical protuberance or a strong apical horn is typically well developed. The wall is single layered (autophragm) and without internal structures. The surface is smooth to finely to coarsely granular. Small tubercles may occur scattered on the surface. Granules or tubercles may be concentrated at the apex. The compound archeopyle is of type 2P, probably equivalent to paraplates 3" and 4". One plate is detached (3"), the 4" is generally attached. No cingulum, sulcus or paratabulation is reflected by the morphology except for the shape of the archeopyle. Size: length 75-118 µm, width 61-103 µm.
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Original diagnosis: Duxbury, 1977, p. 49: Speetonia delicatula
A thin-walled proximate cyst. Test spheroidal to ovoidal, produced into a strong, broadbased projection. The body surface displays no tabulation except for a large, precingular archeopyle formed by the loss of two plates. Body finely to coarsely granular and usually covered by an apparently random scatter of small tubercles. The tip of the apical projection sometimes bears a small, irregular terminal structure.
Observed Dimensions: Holotype 88x73 Ám. Overall 118(95)75x103(82)61 Ám.
Emended diagnosis Piasecki, 1984, p.149-150:
Thin-walled, proximate cysts of spherical to ovoidal shape. A hollow, apical protuberance or a strong apical horn is typical well developed. The wall is single layered (autophragm) and without internal structures. The surface is smooth to finely to coarsely granular. Small tubercles may occur scattered on the surface. Granules or tubercles may be concentrated at the apex. The compound archaeopyle is of type 2P. probably equivalent to paraplates 3" and 4". One plate is detached (3"), the other (4") generally attached. No cingulum, sulcus or paratabulation is reflected by the morphology except for the shape of the archaeopyle.
Remark:
Duxbury, 1977, p. 49: Speetonia delicatula
Well-preserved specimens of Speetonia delicatula are rare. Usually, the body is folded or broken to some extent. Nevertheless, the large, unornamonted test (except for small tubercles) and two-plate precingular archeopyle are usually very distinctive.