Trigonaspis minutissima Thomsen 1980a
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https://doi.org/ 10.4467/16890027AP.15.007.2732 |
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https://treatment.plazi.org/id/03D8878E-FFA4-C57F-5236-FED77991FDDD |
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Felipe |
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Trigonaspis minutissima Thomsen 1980a |
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Trigonaspis minutissima Thomsen 1980a
Trigonaspis minutissima was described alongside the type species of the genus from West Greenland coastal waters ( Thomsen 1980a). Subsequent sampling excursions to the same Disko Bay site has on more occasions yielded additional material of T. minutissima that allows a reexamination of the taxon .
The appearance of the whole cell including appendages and the overall distribution of coccoliths is accounted for in Figs 12 and 16 View Figs 12–16 . Numerical facts have been assembled in Table 1. The tiny cell ( Fig. 12 View Figs 12–16 ) carries a corona of slender and tower-shaped flagellar pole coccoliths while the remaining part of the cell appears to be covered by fairly identical disc-shaped and oval body coccoliths. Trigonaspis minutissima in contrast to T. diskoensis thus appears to be strictly dimorphic. The slender individual FPC is in principle still a double-flared tube ( Figs 13 and 15 View Figs 12–16 ). The triangular groups of crystallites in this species also appear to be organized in a helical pattern. A single turn of the helix in the narrowest middle part of the FPC involves only 4–5 triangles.
The 2D-matrix of triangles on the individual body coccolith ( Fig. 14 View Figs 12–16 ) appears in the undisturbed BC to be similarly well organized as previously reported for T. diskoensis .
In contrast to T. diskoensis there is in T. minutissima a slight difference in the size of triangles among flagellar pole and body coccoliths (see Table 1), with triangles from the body coccoliths being marginally larger.
A life cycle counterpart of T. minutiussima remains to be discovered. Considering the convincing similar- ity between T. diskoensis and T. minutissima in all crucial morphological features, the life cycle counterpart is likely to be a species of Pappomonas . Pappomonas flabellifera Manton and Oates 1975 which is also abun- dantly present in the Disko Bay area ( Thomsen and Østergaard 2014b) is from all perspectives a strong candidate.
Biogeographical data on T. minutissima is presented in Table 2.
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