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Platybursa clathrobursa (Haeckel, 1881)

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Shell nearly ovate, strongly compressed, smooth, one and a half times as long as broad, with deep sagittal stricture in the basal half. Pores very small and numerous, irregularly roundish. Basal plate with four very large triangular holes, two larger (posterior) cardinal, and two smaller (anterior) jugular pores; above the latter (on the frontal face) two large mental pores. Two pectoral feet large, half as long as the shell, at the base fenestrated, vertical, and parallel. Two sagittal feet much smaller, nearly horizontal, pyramidal (the caudal larger than the sternal foot). Two longitudinal pectoral ribs arise on the frontal face.

Dimensions
Shell 0.21 long, 0.14 broad; lateral feet 0.1, sagittal feet 0.02.

Habitat
South Atlantic, Station 332, depth 2200 fathoms.
Haeckel 1887
Platybursa clathrobursa (Haeckel), emend. p. 259, fig. 130, II-V
--Clathrobursa dictyopus Haeckel, 1881, Atlas.
--Tessarospyris clathrobursa Haeckel, 1887: 1051, pl. 53, fig. 7.

Materials
8 specimens, 1-2 in each of the catches from the
surface plankton at 4 stations ("Vityaz", 3478, 3484, 3528 and
"Kovalevskij", 209).

Diagnosis:
Platybursa with hollow legs: the appendages formed
by spines D, Lr and Ll are not completely solid as in the closely
related Neogene species (fig. 130, VIII) but have similar porous
walls to the cephalis itself. The actual sagittal ring is not ex-
pressed and spines A and Vert do not merge at the apex.

Measurements:
Height of cephalis 0.15-0.19 mm; measurement in the sagittal plane 0.12-0.15 mm, in the frontal plane 0.13-0.16 mm. p. 260.

Distribution
Tropical areas of the World Ocean.

Taxonomic remarks:
The species differs from P. cancellata (fig. 130, VI, VII) not only in having peculiar legs but also in that the pores of the wall of the shell are rounded (in P. cancellata the pores are polygonal).

Petrushevskaya 1971


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