Fig. 8
From: Halysis Høeg, 1932 — an ancestral tabulate coral from the Ordos Basin, North China
Modes of reproduction in the ‘multiple-tube’ Halysis. a Longitudinal section of a ‘multiple-tube’ Halysis with fission increase; the arrow points to the new wall inserted in the center of the mother tube; b Longitudinal section of an erect colony; c Longitudinal section of a ‘multiple-tube’ Halysis with arrows pointing to the initial part of a new bud; d Longitudinal section of a ‘multiple-tube’ Halysis with arrows pointing to the fissions of different growth stages; e Longitudinal section of three ‘multiple-tube’ Halysis with arrows pointing to four new walls; f Longitudinal section of a ‘multiple-tube’ Halysis with arrows pointing to the fissions occurring at the same time. g-j Longitudinal section of a ‘multiple-tube’ Halysis with arrows pointing to the fissions. Note the tube diameters of daughter tubes and of mother tubes; k Longitudinal section of a ‘multiple-tube’ Halysis shows the low frequency of budding (number of budding sites versus total tube number) along the growth direction