Back
Odontochitina porifera
Odontochitina porfera Cookson, 1956
Holotype: Cookson, 1956, pl.1, fig.17
Locus typicus: Nelson Bore, Victoria, Australia
Stratum typicum: Senonian
--------------------------------------------------
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Odontochitina porifera Cookson, 1956. According to Cookson (1956), Odontochitina porifera has antapical horns which are perforated in the middle portions by small, rather regularly arranged holes, and are entire at the pointed apices and short proximal regions. The wall of the larger anterior horn is almost completely perforated by small, 4-sided or oval openings, which are arranged in several longitudinal rows that extend from the base to a short distance behind the narrowed apex. Size: overall length 208-234, body 78-81 µm wide, anterior horn 78-96 µm, posterior horns 75-70 µm long, 16-29 µm wide.
--------------------------------------------------
Original description: Cookson, 1956, p. 188
The organism consists of a globular body with two stout appendages, and an operculum with a single broader anterior horn. The walls of the posterior appendages are perforated in the middle portions by small, rather regularly arranged holes, and are entire at the pointed apices and short proximal regions. The wall of the larger anterior horn is almost completely perforated by small 4-sided to oval openings, which are arranged in several longitudinal rows that extend from the base to a short distance behind the narrowed apex. Only 2 complete examples have been found, and neither of these has the extreme tip of the anterior process been preserved.
Dimensions: Holotype: overall length 208 µm, body 78 µm broad; anterior horn 78 µm long, 31 µm broad, posterior appendages 65 µm and 57 µm long, 16 µm broad.
Affinities: Cookson, 1956, p. 118: O. porifera is apparently closely related to O. cribropoda Deflandre and Cookson. In both species the walls of the appandages are perforated, whereas in the genotype, O. operculata from the European and Australian Cretaceous deposits, the walls of the appendages are entire throughout.
O. porifera is a more robust type than O. cribropoda and also differs in the position of the perforated areas of the appendages. In O. cribropda the appendages are club-shaped and the perforations are restricted to the distal regions. In O. porifera, on the other hand, the apices are pointed and their walls entire.
Holotype: Cookson, 1956, pl.1, fig.17
Locus typicus: Nelson Bore, Victoria, Australia
Stratum typicum: Senonian
--------------------------------------------------
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Odontochitina porifera Cookson, 1956. According to Cookson (1956), Odontochitina porifera has antapical horns which are perforated in the middle portions by small, rather regularly arranged holes, and are entire at the pointed apices and short proximal regions. The wall of the larger anterior horn is almost completely perforated by small, 4-sided or oval openings, which are arranged in several longitudinal rows that extend from the base to a short distance behind the narrowed apex. Size: overall length 208-234, body 78-81 µm wide, anterior horn 78-96 µm, posterior horns 75-70 µm long, 16-29 µm wide.
--------------------------------------------------
Original description: Cookson, 1956, p. 188
The organism consists of a globular body with two stout appendages, and an operculum with a single broader anterior horn. The walls of the posterior appendages are perforated in the middle portions by small, rather regularly arranged holes, and are entire at the pointed apices and short proximal regions. The wall of the larger anterior horn is almost completely perforated by small 4-sided to oval openings, which are arranged in several longitudinal rows that extend from the base to a short distance behind the narrowed apex. Only 2 complete examples have been found, and neither of these has the extreme tip of the anterior process been preserved.
Dimensions: Holotype: overall length 208 µm, body 78 µm broad; anterior horn 78 µm long, 31 µm broad, posterior appendages 65 µm and 57 µm long, 16 µm broad.
Affinities: Cookson, 1956, p. 118: O. porifera is apparently closely related to O. cribropoda Deflandre and Cookson. In both species the walls of the appandages are perforated, whereas in the genotype, O. operculata from the European and Australian Cretaceous deposits, the walls of the appendages are entire throughout.
O. porifera is a more robust type than O. cribropoda and also differs in the position of the perforated areas of the appendages. In O. cribropda the appendages are club-shaped and the perforations are restricted to the distal regions. In O. porifera, on the other hand, the apices are pointed and their walls entire.