By Moyano, Hugo
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Additional info for Bryozoan Studies 2004: Proceedings of the 13th International Bryozoology Association conference, Concepción/Chile, 11-16 January 2004
According to Pitcher (1964, p. 674, Fig. 43), B. , p. 672) that in B. chazyensis colonies from the younger Chazyan Crown Point (and Valcour) reefs, acanthorods were more abundant than in conspecific forms in the older Chazyan Day Point reefs. Such variation of acanthorod abundance over time within a species can be interpreted as an example of nonstasis within species evolution, that is, a species does not necessarily remain precisely constant in morphology throughout its geologic lifespan. Separation of B.
8: Weathered surface of a reticulate branching zoarium displaying both oval zooecial openings and long zooecial tubes; GSC 94768, ϫ8; same locality as Fig. 1. 9: Tangential peel displaying 3 to 4 rows of oval zooecia on reticulate branches and long zooecial tubes; GSC 94772, ϫ16; Desrochers’ locality 399A, Île du Fantôme. 6: Eopachydictya aff. gregaria Ross. Oblique tangential peel displaying alignment of oval zooecia; GSC 94778, ϫ16; Desrochers’ locality 309B, Île Nue de Mingan. qxd 04/01/2005 14:44 PM Page 36 In longitudinal section, walls are thin where not recrystallized, gently curving to the periphery where thickened; one or two diaphragms are preserved near surface of the zoarium.
In her original studies, Ross (1963d, p. 857) reported B. chazyensis as the oldest species of Batostoma, but reported it only from localities assigned to the middle and upper Chazy Formation (Ross 1963d, Text-fig. 6). Finks & Toomey (1969) and Toomey & Nitecki (1979) illustrated laminar colonies of B. chazyensis from the lower Chazyan Day Point Formation, and Ross (1981, p. , basal and lower Chazy). Batostoma campensis according to Ross (1963d, p. 857) was widely distributed in the upper part of the Chazy Formation (Valcourian – Pitcher 1964, p.
Bryozoan Studies 2004: Proceedings of the 13th International Bryozoology Association conference, Concepción/Chile, 11-16 January 2004 by Moyano, Hugo