Back
Luehndea spinosa
Luehndea spinosa Morgenroth, 1970
Holotype: Morgenroth, 1970, pl.9, fig.1
Paratypes: Morgenroth, 1970
Locus typicus: L³hnde, Germany
Stratum typicum: Late Pliensbachian
Translation Below, 1990: LPP
--------------------------------------------------
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Luehndea spinosa Morgenroth, 1970, according to Bucefalo Palliani et al. (1997), has a smooth autophragm, homomorphic gonal, solid, straight, conical, distally acuminate processes. The parasutural ornamentation consists of low ridges evident over the entire surface. The cingulum is broad. Tabulation 4', 3a, 6", 6c, 6"’, 1p, 1"”. Archeopyle Size: length is 31-45 µm, width is 23-33 µm, length of processes 5-16 µm.
--------------------------------------------------
Original description: Morgenroth, 1970, p. 347
Diagnosis: Test ovoidal; epitract and hypotract of smaller size. Wall thin; surface of test smooth. Reflected tabulation: 4', 3a, 6'', 6c, 6''', 1p, 1''''. Sutures marked by low crests. Spines arise from many of the plate junctions. These are generally long, stiff and massive and distally pointed. Cingulum broad, slightly laevorotatory. Sulcus broadens towards antapex. Archeopyle type: epithecal, AIP.
Description: The wall of the ovoidal test measures about 1 micron in thickness. The surface of the test is smooth. Some specimens, however, show a row of small granules on the reflected plates flanking the sutures. Four apical plates are reflected. Plate 1' is elongate and abuts against the anterior end of the sulcus. 2', 3' and 4' are pentagonal and of about equal size. On the dorsal side of the epitract, three pentagonal anterior intercalary plates are reflected. All six precingular plates are almost pentagonal. 1'' and 6'' are somewhat smaller than 2'', 3'', 4'' and 5''. On the hypotract six trapezoidal postcingular plates, one posterior intercalary plate and one antapical plates are reflected. The intruding cingulum is displaced ventrally by 1/2-1 cingulum width. The undivided sulcus is clearly intruding. It is considerably wider on the hypotract. The archeopyle is formed by a rupture on the apical side immidiately above the cingulum. The rupture seems to start on the dorsal side of the test because most of the specimens show epitract and hypotract still joined together on the sulcus.
Modified description: Below, 1990, p. 38, 40
Vesicle organisation/tabulation of dinoflagellate amphiesma PR, 4', 3a, 6'', 7c, 6''', 2'''', as, Xs, ps. Pentagonal 1'''' and hexagonal 2'''' partiform; very large omegaform ps. Growth of thecal plates peridinioid.
Zygote cyst skolochorate, acavate to finicavate, polyhedrical, in equatorial outline round or dorsoventrally flattened, tentoriate epicyst and tentoriate hypocyst equally long; wall consisting of thin pedium and overlying luxuria, surface smooth to scabrate, luxuria building low finate bands, which are connected by long, acuminate, solid gonal spines, morphologically identical, finate spines are rare, bands intergonally very low, rising steadily near the corners of the areae towards the sides of the gonal spines and often standing on limbate, wall-like elevated luxuria, in that case with finate cavity between pedium and luxuria; areation scheme XPR, 4', 3a, 6'', Xc/7c, 6''', 2'''', as, xs, ps, areae of the dextral and sinistral epicyst halves almost bilateral symmetrically arranged, 6 precingulars and 6 postcingulars more or less arranged in column, hypocyst with respect to epicyst rotated slightly to the right; PR undifferentiated, nonfinate;
4 apicals: steno VI 1' (V), VI 2' (VL), isocamerate 3' (D), VI 4' (VR;
3 omegaform, inverse-camerate, anterior intercalaries: V 1a, (LDL), V 2a (D), V 3' (VR);
6 precingulars: anteriorly geniculate V-nE 1'' (VVL), V-nE 2'' (L), V-nE 3'' (DL), V-nE 4'' (DDR), V-nE 5'' (R), V-nE 6'' (VVR);
cingulum laevorotatory, flat or deeply indented, nonpartite or heptapartite, in that case lati 1-6c and iso 7c;
6 postcingulars: posteriorly linear V-nE 1''' (VL), IV-nE 2''' (LDL), IV-nE 4''' (DDR), IV-nE 5''' (R), V-nE 6''' (VVR), posterioirly geniculate V-nE 3''' (DDL);
2 antapicals partiform: V 1'''' sloping towards L, VI 2'''' towards R;
sulcus nonpartite, anterior as and posterior ps nonfinate against the inarticulate central sulcus.;
archaeopyle epicystal, PR+1'+2'+3'+4'+1a+2a+3a+1''+2''+3''+4''+5''+6''.; operculum foederate, secate, general opercular formula (PR+1'+2'+3'+4'+1a+2a+3a+1''+2''+3''+4''+5''+6'')s.
Holotype: Morgenroth, 1970, pl.9, fig.1
Paratypes: Morgenroth, 1970
Locus typicus: L³hnde, Germany
Stratum typicum: Late Pliensbachian
Translation Below, 1990: LPP
--------------------------------------------------
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Luehndea spinosa Morgenroth, 1970, according to Bucefalo Palliani et al. (1997), has a smooth autophragm, homomorphic gonal, solid, straight, conical, distally acuminate processes. The parasutural ornamentation consists of low ridges evident over the entire surface. The cingulum is broad. Tabulation 4', 3a, 6", 6c, 6"’, 1p, 1"”. Archeopyle Size: length is 31-45 µm, width is 23-33 µm, length of processes 5-16 µm.
--------------------------------------------------
Original description: Morgenroth, 1970, p. 347
Diagnosis: Test ovoidal; epitract and hypotract of smaller size. Wall thin; surface of test smooth. Reflected tabulation: 4', 3a, 6'', 6c, 6''', 1p, 1''''. Sutures marked by low crests. Spines arise from many of the plate junctions. These are generally long, stiff and massive and distally pointed. Cingulum broad, slightly laevorotatory. Sulcus broadens towards antapex. Archeopyle type: epithecal, AIP.
Description: The wall of the ovoidal test measures about 1 micron in thickness. The surface of the test is smooth. Some specimens, however, show a row of small granules on the reflected plates flanking the sutures. Four apical plates are reflected. Plate 1' is elongate and abuts against the anterior end of the sulcus. 2', 3' and 4' are pentagonal and of about equal size. On the dorsal side of the epitract, three pentagonal anterior intercalary plates are reflected. All six precingular plates are almost pentagonal. 1'' and 6'' are somewhat smaller than 2'', 3'', 4'' and 5''. On the hypotract six trapezoidal postcingular plates, one posterior intercalary plate and one antapical plates are reflected. The intruding cingulum is displaced ventrally by 1/2-1 cingulum width. The undivided sulcus is clearly intruding. It is considerably wider on the hypotract. The archeopyle is formed by a rupture on the apical side immidiately above the cingulum. The rupture seems to start on the dorsal side of the test because most of the specimens show epitract and hypotract still joined together on the sulcus.
Modified description: Below, 1990, p. 38, 40
Vesicle organisation/tabulation of dinoflagellate amphiesma PR, 4', 3a, 6'', 7c, 6''', 2'''', as, Xs, ps. Pentagonal 1'''' and hexagonal 2'''' partiform; very large omegaform ps. Growth of thecal plates peridinioid.
Zygote cyst skolochorate, acavate to finicavate, polyhedrical, in equatorial outline round or dorsoventrally flattened, tentoriate epicyst and tentoriate hypocyst equally long; wall consisting of thin pedium and overlying luxuria, surface smooth to scabrate, luxuria building low finate bands, which are connected by long, acuminate, solid gonal spines, morphologically identical, finate spines are rare, bands intergonally very low, rising steadily near the corners of the areae towards the sides of the gonal spines and often standing on limbate, wall-like elevated luxuria, in that case with finate cavity between pedium and luxuria; areation scheme XPR, 4', 3a, 6'', Xc/7c, 6''', 2'''', as, xs, ps, areae of the dextral and sinistral epicyst halves almost bilateral symmetrically arranged, 6 precingulars and 6 postcingulars more or less arranged in column, hypocyst with respect to epicyst rotated slightly to the right; PR undifferentiated, nonfinate;
4 apicals: steno VI 1' (V), VI 2' (VL), isocamerate 3' (D), VI 4' (VR;
3 omegaform, inverse-camerate, anterior intercalaries: V 1a, (LDL), V 2a (D), V 3' (VR);
6 precingulars: anteriorly geniculate V-nE 1'' (VVL), V-nE 2'' (L), V-nE 3'' (DL), V-nE 4'' (DDR), V-nE 5'' (R), V-nE 6'' (VVR);
cingulum laevorotatory, flat or deeply indented, nonpartite or heptapartite, in that case lati 1-6c and iso 7c;
6 postcingulars: posteriorly linear V-nE 1''' (VL), IV-nE 2''' (LDL), IV-nE 4''' (DDR), IV-nE 5''' (R), V-nE 6''' (VVR), posterioirly geniculate V-nE 3''' (DDL);
2 antapicals partiform: V 1'''' sloping towards L, VI 2'''' towards R;
sulcus nonpartite, anterior as and posterior ps nonfinate against the inarticulate central sulcus.;
archaeopyle epicystal, PR+1'+2'+3'+4'+1a+2a+3a+1''+2''+3''+4''+5''+6''.; operculum foederate, secate, general opercular formula (PR+1'+2'+3'+4'+1a+2a+3a+1''+2''+3''+4''+5''+6'')s.