A systematic study of three species of Celleporina (Bryozoa, Cheilostomata) from Hokkaido, Japan with special reference to their early astogeny

概要

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Celleporina porosissima and two new species, C. umbonata n. sp. and C. fusiforma n. sp., from Hokkaido, Japan are described with emphasis on early astogeny. Among its congeners, C. umbonata n. sp. is unique in possessing three such characteristics in combination as, a single frontal umbo, a subterminal avicularium on its column, and the avicularian frontal at a right angle to the orifice ; C. fusiforma is distinct in having the combination of spiramina on frontally budded zooids, a tabula with entire peripheral pores, and pisiform colonies. The three species differ in astogenetic features as follows : The ancestrulae of C. porosissima have a budding zone around the distal half from which the first zooid buds off ; those of the two new species have a pair of disto-lateral buds from which the first paired zooids bud simultaneously. As the presence of paired zooid buds is assumed to be a synapomorphy, Celleporina umbonata n. sp. and C. fusiforma n. sp. are considered to be more closely related to each other than to C. porosissima.
社団法人日本動物学会の論文
1993-12-15