Psolidium Ludwig 1886
Key to Antarctic and Sub-Antarctic species of Psolidium Ludwig, 1886 1. Mid-ventral (sole) radial series of tube feet present 2 — Lacking mid-ventral (sole) radial series of tube feet 3 2. Ossicles in sole include irregularly oval to round disc-like smooth plates, variably with few minute, closed to...
| Main Authors: | , |
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| Format: | Other/Unknown Material |
| Language: | unknown |
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Zenodo
2008
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| Subjects: | |
| Online Access: | https://doi.org/10.5281/zenodo.10665991 http://treatment.plazi.org/id/03D7DF24FF80FF9400AEF9F33709FE27 |
| Summary: | Key to Antarctic and Sub-Antarctic species of Psolidium Ludwig, 1886 1. Mid-ventral (sole) radial series of tube feet present 2 — Lacking mid-ventral (sole) radial series of tube feet 3 2. Ossicles in sole include irregularly oval to round disc-like smooth plates, variably with few minute, closed to almost closed, perforations P. disciformis (Théel, 1886) (S Chile) — Irregularly oval to round, disc-like smooth plates, variably with few minute, closed to almost closed, perforations, not present in sole P. dorsipes Ludwig, 1886 (S Chile, S Argentina, Strait of Magellan, Burdwood Bank, Falkland Is) 3. Dorsally with deep goblet-like cups, closed across rim, vertical spines above rim; brood-protects in folds of sole P. incubans Ekman, 1925 (South Georgia) — Dorsally lacking deep goblet-like cups closed across rim; no brood-protection in folds of sole 4 4. Dorsal and lateral scales conspicuous; dorsal and lateral tube feet inconspicuous; lacking numerous dorsal and lateral tube feet support ossicles; crosses and small perforated plates rare to absent in sole 5 — Dorsal and lateral scales inconspicuous; dorsal and lateral tube feet numerous and conspicuous; dorsal and lateral tube foot support ossicles numerous; sole with numerous perforated plates 9 5. Largest tentacle trunk ossicles predominantly thick, narrow rod-plates and perforated plates with prominent rod thickenings P. tenue Mortensen, 1925 (Antarctic Peninsula, Ross Sea, Wilkes Land, Antipodes I., Prydz Bay) — Largest tentacle trunk ossicles predominantly smooth perforated plates 6 6. Dorsal scales frequently with well-developed, radiating-to-margin, linear, rounded thickenings between rows of marginal perforations P. poriferum (Studer, 1876) (Marion, Kerguelen, Heard, McDonald Is; MacRobertson Land) — Dorsal scales rarely with linear thickenings between rows of marginal perforations 7 7. Dorsal scales frequently with smooth white thickening; perforations reduced, many almost closed P. pawsoni sp. nov. (Weddell Sea, Ross Sea, Enderby Land) — Dorsal scales ... |
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