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Coral growth in Oligophylloides pachylhecus Rozkowska, 1969

100%

Wrzolek T.

Acta Palaeontologica Polonica

1980

tom 25

nr 3-4

Coral growth in Heterocorallia is described and illustrated for the first time. It has been studied in Oligophyltoides pachythecus Różkowska, 1969 from the Upper Famennian of the Świętokrzyskie (Holy Cross) Mountains, Poland. One single offset at a time was formed laterally with respect to the parent polyp. It did not inherit any, septa from the parent corallite forming its own, independent set of septa. The young polyp was for a long time connected with the parent by soft tissue being separated from its skeleton by a tabulotheca. The theca and possibly all the other skeletal elements of the species studied grew centrifugally. Evidence is presented that O. pachythecus had a distal part of its corallite in the shape of a slender distal cone with a set of septa protruding on top of the cone.

Septal development of Oligophylloides pachythecus from the Famennian of Poland

80%

Sutherland P. K., Forbes C. L.

Acta Palaeontologica Polonica

1980

tom 25

nr 3-4

The septal development of Oligophylloides pachythecus Różkowska, the type species for the genus, has been studied by means of closely spaced serial sections. It has been observed that four original septa were secreted on a basal plate with two sets of adjacent septa joining before the two resulting axial septa each join. The result is a symmetrical double 'Y', with the bases of the letters joined at the axis. Subsequently each of these four may split peripherally, producing eight septa. Next, two additional septa were added pinnately on each side on one of the open fossulae, but not within the adjacent enclosed loculae. The specimens studied have a total of only 10 septa each. The resulting septal pattern, which produces a bilateral symmetry with open fossulae in the plane of symmetry, is at marked variance with the previously assumed septal insertion plans described from Lower Carboniferous heterocorals.

Ograniczanie wyników

2 Acta Palaeontologica Polonica

1 Forbes C. L.

1 Sutherland P. K.

1 Wrzolek T.

2 1980

Wyniki wyszukiwania

Coral growth in Oligophylloides pachylhecus Rozkowska, 1969

Septal development of Oligophylloides pachythecus from the Famennian of Poland