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Marine diatom genus Climaconeis (Berkeleyaceae, Bacillariophyta): two new species, Climaconeis koenigii and C. colemaniae, from Florida Bay, USA

2000; Taylor & Francis; Volume: 39; Issue: 3 Linguagem: Inglês

10.2216/i0031-8884-39-3-199.1

2330-2968

A. K. S. K. Prasad, Kimberly A. Riddle, James A. Nienow,

Environmental Monitoring and Data Management

Two new species of marine, epipelic, biraphid diatoms of the genus Climaconeis, Climaconeis koenigii A.K.S.K Prasad and C. colemaniae A.K.S.K Prasad, collected from several localities in Florida Bay, USA, are described by means of light and scanning electron microscopy. Climaconeis koenigii is characterized by extremely long and narrow arcuate cells (200–468 μm long and 2–4 μm wide) with fine striae, straight rather than curved central raphe endings, and 48–72 H-shaped plastids and by the absence of stauros and associated pores. Climaconeis colemaniae closely resembles C. scopulorioides in valve shape and in the structure and arrangement of the striae, polar mantle slits, central stauros, and two isolated pores in the central area; it differs from it in the stria density and the number of plastids. The new species are compared with other members of the genus, including the generitype C. lorenzii, which is also found in Florida Bay, and C. inflexa. A revised artificial key to the known species of Climaconeis is also provided.