of resting spores more or less evenly vaulted with two large processes originating near valve edge, growing toward or into setae of vegetative valve, valve center covered with numerous small spines; secondary valve evenly vaulted to bluntly truncated, occasionally with processes and spines.
Chaetoceros ceratosporus var. brachysetus Rines 8c Hargraves Reference: Rines 8c Hargraves, 1986, p. 105, Figs. 7-21 and 24-26; Rines 8c Hargraves, 1988, p. 63, Figs. 123-127. Setae thicker and shorter than in the nominate variety and constricted at the base.
Chaetoceros simplex Ostenfeld (Plate 47, Table 55) References: Ostenfeld, 1901b, p. 137, Fig. 8; Hustedt, 1930, p. 755, Fig. 437; Hendey, 1964, p. 137, Plate 19, Fig. 2. Setae thin, long, straight and lying in the direction of apical axis of the cell. Resting spores with vaulted valves with spines.
Chaetoceros tenuissimus Meunier (Plate 47, Table 55) Synonym: Chaetoceros simplex var. calcitrans Paulsen. References: Paulsen, 1905, p. 6; Meunier, 1913, p. 49, Plate 7, Fig. 55; Hustedt, 1930, p. 756, Fig. 438; Rines 8c Hargraves, 1988, p. 97. Cells extremely small with apical and pervalvar axes approximately equal. Setae straight, sometimes scarcely longer than apical axis, emerging from poles of valve at a 45° angle to both apical and pervalvar axes. Resting spores unknown. Probably one chloroplast. See Rines 8c Hargraves (1988, p. 97) for discussion about C. galvestonensis Collier 8c Murphy and C. calcitrans f. pumilus Takano as synonyms of C. tenuissimus. Remarks: In light of the evident identification problems the distribution of these species can scarcely be given. They seem to occur mainly in brackish and other inshore waters.
4. Two, seldom three, setae per cell.
Chaetoceros minimus (Levander) Marino, Giuffre, Montresor, 8c Zingone,
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