Emschermannia ramificata Borisanova 2016, sp. nov.
Emschermannia ramificata sp. nov. (Figs 1–4) Material examined. Holotype : ZMMU No. Uk-7, from central plateau of Kara Sea, 73°43.05' N, 79°23.38' E, 29 m, September–October 2011. Paratypes : ZMMU No. Uk-8), five specimens from the same locality. Other material : ZMMU No. Uk-9, three speci...
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| Format: | Other/Unknown Material |
| Language: | unknown |
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Zenodo
2016
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| Online Access: | https://doi.org/10.5281/zenodo.6073823 http://treatment.plazi.org/id/0A678784B26E2579FDC1FD5B80130458 |
| Summary: | Emschermannia ramificata sp. nov. (Figs 1–4) Material examined. Holotype : ZMMU No. Uk-7, from central plateau of Kara Sea, 73°43.05' N, 79°23.38' E, 29 m, September–October 2011. Paratypes : ZMMU No. Uk-8), five specimens from the same locality. Other material : ZMMU No. Uk-9, three specimens from central plateau of Kara Sea, 73°10' N, 79°51' E, 25 m. ZMMU No. Uk-10, three specimens from central plateau of Kara Sea, 74°17' N, 79°37' E, 33 m. ZMMU Uk-11, two species from St Anna trough of Kara Sea, 77º12' N, 78º07' E, 119 m. ZMMU Uk-12, four species from St Anna trough of Kara Sea, 78º00' N, 74º53' E, 364 m, all September–October 2011. Etymology. Latin ramus , branch, and facio , make, alluding to the unusual branched attachment structure of this species Description. Solitary, with single zooids attached to substratum by basal plate and short or long, usually branched, pseudostolons. Total length of body from end of stalk to base of tentacles 250–300 µm (Table 1). Calyx length 160–200 μm, width at broadest part 130–160 μm. Calyx laterally compressed, with 8–10 tentacles, facing distally or slightly distofrontally in contracted state. Tentacle crown of calyx with developing larvae directed distofrontally. Sensitive papillae absent. Stomach rounded without lobes. No cuticular septum between calyx and stalk (Fig. 2D). Stalk shorter than calyx, slightly extended at base, 80–110 μm long, 30–60 μm wide. Attachment structure an expanded basal plate from which sterile appendices (pseudostolons) grow out in different directions; these structures unequal, ranging from 50 to 600 μm long and 25–40 μm wide. Long pseudostolons usually growing from basal plate in opposite directions (Figs 2C, 4C); short pseudostolons growing from basal plate in any direction, also originating from long pseudostolons. Basal plate may be reduced in some specimens such that zooid arises only from creeping pseudostolon (Fig. 4B). In other specimens basal plate can attain diameter> 100 μm. Two unusual specimens of Emschermannia were found among ... |
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