Key To Species

la. Head pole bluntly rounded or almost square, with two spines, the other end (foot pole) smoothly tapering, areolae in two or more rows along each margin 2

lb. Head pole in valve view narrowly club shaped, with one spine, the other end suddenly constricting before a fairly long tapering apex, large marginal areolae in one row along each valve margin, sternum wide except near the tapering apex L. elongatum21 (Grunow) Hasle comb. nov.

20 These structures may be difficult to observe with LM or may be lacking. With EM they are seen as flattened bubbles of about the same size as an areola, with a central opening and positioned on the internal valve surface (Plate 54, Figs, la-lc, 2b, and 3b, SEM).

21 Basionyms: Thalassiothrix elongata Grunow in Van Hureck, Thalassiothrix delicatula Cupp and Thalassiothrix mediterrĂ¡nea var. pacifica Cupp, respectively. Synonym of Lioloma elongatum: Thalassiothrix vanhoeffenii Heiden.

Lioloma pacificum

Lioloma elongatum

PLATE S3 Lioloma pacificum (a) valve outline. Scale bar = 100 fim; (b) foot pole, with valve structure; (c) median part of valve; (d) head pole with two apical spines. Scale bar =10 /un; (e) colony. Scale bar = 100 /u.m. After Cupp (1943). Lioloma elongatum : (a) foot pole; (b) median part of valve; (c) head pole with one apical spine. Scale bar = 10 )xm.

Lioloma pacificum

Lioloma elongatum

PLATE S3 Lioloma pacificum (a) valve outline. Scale bar = 100 fim; (b) foot pole, with valve structure; (c) median part of valve; (d) head pole with two apical spines. Scale bar =10 /un; (e) colony. Scale bar = 100 /u.m. After Cupp (1943). Lioloma elongatum : (a) foot pole; (b) median part of valve; (c) head pole with one apical spine. Scale bar = 10 )xm.

2a. Valve widened at head pole (valve and girdle views), gradually narrower until about one-third cell length from head pole, then wider and about the same width until tapering foot pole. Cell distinctly twisted. Structure very delicate. Solitary L. delicatulumu (Cupp) Hasle comb. nov.

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