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Larcopyle polyacantha titan
Lazarus et al, 2005
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Description - Add description
Derivation of name. The name ‘titan’ is retained here to maintain the maximum degree of compatibility possible with the existing Antarctic biostratigraphic literature. It also reflects the relatively large size of this form in comparison to other morphotypes within the species group.
Holotype. Plate 3, fig. 3, sample 746A-11-2, 53 cm. Museum für Naturkunde Mikropaläontologie, Accession Number ECO-016.
Occurrence. Late Miocene–Early Pliocene (c. 9.5–4.0 Ma). A few specimens of this morphotype were also seen in sample 690B-6-2, 23 cm (estimated age c. 14.8 Ma).
Description. The relatively large shell, length 170–250 µm, has a very characteristic ellipsoidal shape with rounded truncate conical ends (e.g. the outer shell deviates from a geometric ellipsoidal shape near the poles and appears to be slightly flattened on each side near the poles in outline view). The medium-sized pores are surrounded by frames, spines can be seen on both poles. These are usually much longer on the pylome pole. The shell is filled by a single (?) spiral with closely spaced whorls, or is totally spongy. Caps sit on the opposite sides of the denser central core. A wide, sometimes tube-like pylome is obvious. | | Lazarus et al 2005 |
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