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Larcospira bulbosa Goll and Björklund, 1989

Description - Add description

Diagnosis:
A species of Larcospira characterized by its thick-walled, uniformly perforate cortical lattice shell and irregularly swollen or invaginated margin.

Etymology:
The trivial name is derived from the Latin word bulbosus, meaning swelling.

Description:
The skeleton consists of three lattice whorls that appear as simple lattice shells in plane view. The whorls are interjoined by a multitude of delicate radial beams that do not penetrate the cortical shell as spines. Cortical shell thick walled, densely and uniformly perforated by small, round pores. Medullary shells ovate in outline. Cortical shell margin varies from smoothly ovate to laterally constricted with alternating swellings and invaginations.

Occurrence:
Larcospira bulbosa occurs only in Section 104-642C-15H, CC to Sample -15H-7, 25-27 cm.

Size: 116-145 μm, maximum diameter of the cortical lattice shell.

Holotype: PMO 117.580; Section 104-642C-15H, CC; England Finder W35/3; PL 2, Figs. 16-19.

Picture:16-19. Holotype; PMO 117.580; England Finder W35/3; Section 104-642C-15H, CC.
Goll and Björklund 1989


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