Abc

PLATE 54 Scanning electron micrographs. (1) Lioloma delicatulum: (a) internal view of head pole, two apical spines, "parrot beak"-shaped labiate process, two or three marginal rows of foramina, and one "bubble shaped" structure; (b) part of valve, internal view with narrow sternum, three marginal rows of foramina, and one "bubble-shaped" structure; (c) part of valve, external view with narrow sternum, vela divided into several compartments, and external openings (?) of two bubble-shaped structures. (2) Lioloma pacificum: (a) external view of head pole with two apical spines, external opening of labiate process, and vela in irregular pattern; (b) part of valve, internal view with wide sternum, three marginal rows of foramina, and two bubble-shaped structures; (c) part of valve, external view with wide sternum, and two marginal rows of vela. (3) Lioloma elongatum: (a) external view of head pole with one apical spine and external opening of labiate process; (b) part of valve, internal view with wide sternum, one marginal row of foramina, and one bubble-shaped structure; (c) part of valve, external view with wide sternum, and one marginal row of vela. Scale bar = 1 p.m.

TABLE 65 Morphometric Data of Lioloma spp.

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