Sternaspis Otto 1821
Key to species of Sternaspis Otto, 1821 (Modified after Salazar-Vallejo & Buzhinskaja 2013) 1 Ventro-caudal shield fan with a distinct median notch. 2 - Ventro-caudal shield fan continuous, without distinct median notch. 12 2 (1) Shield with radial ribs and concentric lines distinct. 3 - Shield...
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| Format: | Other/Unknown Material |
| Language: | unknown |
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2014
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| Online Access: | https://zenodo.org/record/6137642 https://doi.org/10.5281/zenodo.6137642 |
| Summary: | Key to species of Sternaspis Otto, 1821 (Modified after Salazar-Vallejo & Buzhinskaja 2013) 1 Ventro-caudal shield fan with a distinct median notch. 2 - Ventro-caudal shield fan continuous, without distinct median notch. 12 2 (1) Shield with radial ribs and concentric lines distinct. 3 - Shield with radial ribs distinct, concentric lines barely visible. 10 3 (2) Fan with median notch shallow. 4 – Fan with median notch deep; shields usually with concentric bands. 5 4 (3) Shield with distinct concentric bands; main rib and posterior corners directed posteriorly. S. affinis Stimpson, 1864 (NE Pacific Ocean). - Shield without concentric bands; posterior corners directed laterally. S. scutata (Ranzani, 1817) (Mediterranean Sea and NE Atlantic Ocean). 5 (3) Shield with posterior corners distinct in frontal view. 6 - Shield with posterior corners poorly defined in frontal view. 7 6 (5) Radial ribs and concentric lines distinct, well defined; body whitish to grayish. S. costata von Marenzeller, 1879 (NW Pacific Ocean). - Radial ribs and concentric lines barely defined; body brownish. S. sendalli n. sp. (Antarctic Ocean) 7 (5) Anterior keels usually exposed. 8 - Anterior keels rarely exposed; fan barely projecting posteriorly beyond posterolateral corners. 9 8 (7) Shield with anterior corners projecting at least as far as anterior keels, longer in larger specimens; fan margin crenulated in small specimens, dentate in larger ones. S. buzhinskajae n. sp. (Arctic Ocean) - Shield with anterior corners projecting as far as anterior keels; fan margin smooth to crenulated, never dentate. S. islandica Malmgren, 1867 (NE Atlantic Ocean, Iceland) 9 (7) Introvert and body with similar pigmentation or introvert paler; shield widest medially. S. fossor Stimpson, 1853 (NW Atlantic Ocean) - Introvert and body with different pigmentation, introvert darker; shield widest anteriorly. S. annenkovae Salazar-Vallejo & Buzhinskaja, 2013 (NW Pacific Ocean) 10 (2) Main ribs markedly divergent; fan as wide as anterior margins or wider. ... |
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