Beroe cucumis Fabricius 1780
BEROE CUCUMIS FABRICIUS, 1780 The body shape is strait or slightly oval in the oral part and oval at the aboral side, and it is more flattened in the paragastral plane than B. pseudocucumis (Fig. 6C, D). The adult length varies from 50 to 150 mm. Its length to width ratio (l/w) ranges 1.6–2.2. This...
| Main Authors: | , |
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| Format: | Other/Unknown Material |
| Language: | unknown |
| Published: |
2021
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| Online Access: | https://zenodo.org/record/5799227 https://doi.org/10.5281/zenodo.5799227 |
| Summary: | BEROE CUCUMIS FABRICIUS, 1780 The body shape is strait or slightly oval in the oral part and oval at the aboral side, and it is more flattened in the paragastral plane than B. pseudocucumis (Fig. 6C, D). The adult length varies from 50 to 150 mm. Its length to width ratio (l/w) ranges 1.6–2.2. This ratio is variable: we observed specimens, which were shorter and longer, wider or slenderer, but never less than for B. pseudocucumis. Juvenile individuals may be narrower in the oral part of the body. Similar individuals were illustrated by Mayer (1912). The meridional canals lie under eight rows of ciliary combs, which extend about three-quarters of the distance from the aboral pole towards the mouth or a bit longer, but not up to the mouth. Its meridional canals have numerous diverticulae, which may branch out in adult ctenophores, but do not anastomose with each other, and do not connect with paragastral canals. At the aboral end, two oval polar-plates (Fig. 6A) surround the sense organ at the oval aboral pole, and are fringed with a row of short, branched papillae. Macrociliaries have three-toothed macrociliary tips with a somewhat larger middle tooth (Tamm & Tamm, 1993). Geographical distribution: Beroe cucumis was previously believed to be a widespread species, continuously distributed from the Arctic to the Antarctic (Pages & Orejas, 1999), but according to our genetic and morphological studies, and by comparison of published data, this species has a bipolar distribution, inhabiting cold polar and temperate waters, while being absent from tropical and subtropical zones. Distribution in the Arctic: all Eurasian seas (Sirenko, 2001), including the Barents Sea (Manko et al., 2015; Bandara et al., 2016; this study), the White Sea (Kosobokova & Pertsova, 2018), the Kara Sea (Dvoretsky & Dvoretsky, 2017), the Laptev Sea (Abramova & Tuschling, 2005), the East-Siberian Sea and the Chukchi Sea (Ershova et al., 2015); Canada Basin (Raskoff et al., 2005; Purcell et al., 2010). Distribution in the ... |
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