A new genus of frenulates (Annelida: Siboglinidae) from shallow waters of the Yenisey River estuary, Kara SeaстатьяИсследовательская статья
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Аннотация:Only seven frenulate species are currently known along the Eurasian coast of the Arctic Ocean. We describe
a new genus and a new species of frenulates Crispabrachia yenisey, gen. nov. et sp. nov. The morphological analysis
involved standard anatomical techniques, semithin sections and scanning electron microscopy (SEM). The molecular
study included four markers (partial COI, 16S, 18S and 28S) and implemented Bayesian and Maximum likelihood
phylogenetic approaches. The description of Crispabrachia gen. nov. is the first documented finding of frenulates in the
Kara Sea at the estuary of the Yenisey River in rather shallow water (28 m). The establishment of a new genus is
warranted based on the composition of morphological characters and several specific features including free,
comparatively short curly tentacles, a triangular cephalic lobe with amplate base, the valvate extension of the
posterior part of the forepart and prominent papillae on the nonmetameric region. The tube structure with
prominent frills and the worm’s numerous tentacles, metameric papillae with cuticular plaques and segmental
furrow on the forepart indicate that the new genus belongs to the polybrachiid group. Although the type locality
in the Yenisey River estuary is unusual for siboglinids in general, the physical conditions here are common for other
frenulates habitats, i.e. salinity ~30–33, bottom water temperature –1.5C. This finding was made in the Yenisey Gulf in
the region with the highest methane concentrations in the southern part of the Kara Sea that reflects permafrost
degradation under the influence of river flow. Further study of the region would help to understand the factors
influencing frenulate distributions and improve our knowledge of their biodiversity.