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Larcopyle butschlii Dreyer (Figure 5B, 5B’, 15.85). Ellipsoidal outer shell with
irregular pores, surface often thorny or spiny, inner
structure spiral. One of the poles bears a pylome
surrounded by larger spines. Major diameter: 80-170 µm.
Ref: Nigrini and Moore
(1979).
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Larcospira quadrangula Haeckel (Figure 15.86). Shell consists of two open
spirals arising from a common origin. Breadth of shell:
120-250 µm. Ref: Nigrini and Moore
(1979).
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Lithelius minor Jorgensen group? (Figure 15.87). Tightly wound spiral with thorny
or spiny surface, outline circular or ovoid. Diameter:
80-150 µm. Ref: Nigrini and Moore
(1979).
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Lithelius nautiloides Popofsky (Figure 5C, 5C’, 15.88). Small, spherical medullary shell
surrounded by an involute spiral of four-five whorls
which increase in width outwards; surface spiny.
Diameter: 100-230 µm. Ref: Petrushevskaya (1967).
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Pylospira octopyle Haeckel (Figure 15.90) [=?Phorticium pylonium]. A
series of spirally arranged chambers; outline
ellipsoidal; surface spiny. Shell diameter: 80-130 µm.
Ref: Nigrini and Moore
(1979).
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Tholospira cervicornis
Haeckel group (Figure 15.89). Irregular meshwork with pores of
variable size; surface spiny. Probably an artificial
category for lumping various juvenile, broken and poorly
known Litheliidae and Pyloniidae. Ref: Petrushevskaya (1967), Takahashi and
Honjo (1981).
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