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Netrelytron par
Netrelytron "par" Gitmez, 1970, p.314–315, pl.5, fig.4; pl.9, fig.4. Holotype: Gitmez, 1970, pl.9, fig.4. Originally Netrelytron, subsequently Kalyptea. Taxonomic senior synonym: Netrelytron (as Kalyptea) stegastum, according to Poulsen (1996, p.61). Taxonomic senior synonyms: Pareodinia ceratophora subsp. ceratophora (as Pareodinia ceratophora var. ceratophora), according to Below (1990, p.65); Netrelytron (as Kalyptea) trinetrum, according to Wiggins (1975, p.110). For etymology, see Kalyptea par. N.I.A. Age: early Kimmeridgian.
Original diagnosis: Gitmez, 1970, p.314
Netrelytron having a broadly ovoidal periblast, tapering to form a strong apical horn at the apex and a blunt, short mamelon at the antapex. Apical and antapical projections are formed by the periphragm only. Endoblast spheroidal, thin-walled and often hard to distinguish. The surfaces of the endophragm and periphragm are smooth or very finely granular.
Dimensions: Holotype: length of the periblast 85 µm, breadth 60 µm; apical horn length 16 µm, antapical horn length 6 µm. Range of the English specimens (11 specimens measured): overall length 60-85 µm, breadth 35-60 µm; apical horn length 10-16 µm, antapical horn length 3-6 µm. French specimens (10 specimens measured): overall length 62-80 µm, breadth 35-60 µm; horn length 10-12 µm, antapical horn length 3-5 µm.
Original description: Gitmez, 1970, p.315
The shell is consistently enclosed in a cloak of organic matter. The periblast is ovoidal in shape, with a spherical endoblast. At the apex of the periblast, a strong apical horn is present, but the antapex is only slightly projecting. Both projections are formed by the periphragm only. Neither tabulation nor an archaeopyle was observed in any of the specimens. Although it is usual to find only a single body enclosed in each organic debris mass, two shells, apex to antapex, inside the same organic debris mass were observed in one instance (pl. 5, fig. 4).
Affinities:
Gitmez, 1970, p.315: This new species is common in the assemblages from Dorset, Normandy and the Boulonnais, but rare in the Le Havre and Stretham material. It is easily distinguishable from the only previously described species of the genus, N. stegastum, in its much less-marked antapical horn and more broadly elongate shape.
Original diagnosis: Gitmez, 1970, p.314
Netrelytron having a broadly ovoidal periblast, tapering to form a strong apical horn at the apex and a blunt, short mamelon at the antapex. Apical and antapical projections are formed by the periphragm only. Endoblast spheroidal, thin-walled and often hard to distinguish. The surfaces of the endophragm and periphragm are smooth or very finely granular.
Dimensions: Holotype: length of the periblast 85 µm, breadth 60 µm; apical horn length 16 µm, antapical horn length 6 µm. Range of the English specimens (11 specimens measured): overall length 60-85 µm, breadth 35-60 µm; apical horn length 10-16 µm, antapical horn length 3-6 µm. French specimens (10 specimens measured): overall length 62-80 µm, breadth 35-60 µm; horn length 10-12 µm, antapical horn length 3-5 µm.
Original description: Gitmez, 1970, p.315
The shell is consistently enclosed in a cloak of organic matter. The periblast is ovoidal in shape, with a spherical endoblast. At the apex of the periblast, a strong apical horn is present, but the antapex is only slightly projecting. Both projections are formed by the periphragm only. Neither tabulation nor an archaeopyle was observed in any of the specimens. Although it is usual to find only a single body enclosed in each organic debris mass, two shells, apex to antapex, inside the same organic debris mass were observed in one instance (pl. 5, fig. 4).
Affinities:
Gitmez, 1970, p.315: This new species is common in the assemblages from Dorset, Normandy and the Boulonnais, but rare in the Le Havre and Stretham material. It is easily distinguishable from the only previously described species of the genus, N. stegastum, in its much less-marked antapical horn and more broadly elongate shape.