Key To Species

la. Band ends in a straight line 2

lb. Band ends in an oblique line 4

2a. Process marginal 3

2b. Process central with external tube fitting into a depression (pocket) in adjacent cell D. fragilissimus (Bergon) Hasle comb. nov.

3a. No external process tube D. blavyanus (H. Peragallo) Hasle

3b. Short external process tube fitting into a depression (pocket) in adjacent cell D. phuketensis (Sundstrom) Hasle comb. nov.

4a. Process central, no external tube. . . . D. tenuijunctus (Manguin) Hasle 4b. Process marginal, occasionally closer to valve center, no external tube D. antarcticus Castracane

A. Band ends in an oblique line: D. antarcticus, and D. tenuijunctus (Table 37).

B. Band ends in a straight line: D. blavyanus, D. fragilissimus, and D. phuketensis (Table 37).

A. Band ends in an oblique line.

Dactyliosolen antarcticus Castracane (Plate 32, Table 37) References: Castracane, 1886, p. 75, Plate 9, Fig. 7; Hustedt, 1930, p. 556, Fig. 316; Cupp, 1943, p. 76, Fig. 37; Hasle, 1975, p. 119, Figs. 90-100, 109-112.

TABLE 37 Morphometric Data of Dactyliosolen spp.

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