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TESSEROPORA PILSBRY (CIRRIPEDIA, THORACICA) FROM THE PLIOCENE OF THE GULF OF CALIFORNIA BY VICTOR A. ZULLO 1) Department of Geology, California Academy of Sciences, San Francisco, California 94118, U.S.A. . INTRODUCTION The subgenus Tesseropora Pilsbry, 1916, encompasses those species of Tetra- clita Schumacher, 1817, that possess but a single row of parietal tubes as full- grown adults. The type species, T. rose (Krauss) has been reported from South Africa and southeastern Australia. The three other extant members of this sub- genus are considered subspecies of Tetraclita wireni Nilsson-Cantell. The typical subspecies is reported from Sumatra and Palao Islands, the subspecies pacifica Pilsbry from Wake Island and the Marshall Islands, and the subspecies africana Nilsson-Cantell from Dar-es-Salaam, Tanzania. Pilsbry (1916: 260) considered T. i.r.reli Alessandri from the Oligocene (Tongrian) of Italy to be a Te.r.reropora closely related to T etraclita rose. Henry (1957: 36) raised T. wireni pacifica to specific rank and re-assigned it to the typical subgenus Tetraclita. The latter change was based on the tendency of the parietal septa to divide near the outer margin of the shell, thus forming one or two series of small secondary tubes. However, this same tendency is also observable in certain
Crustaceana – Brill
Published: Jan 1, 1968
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