Monocoryne antarctica CANTERO, 2017, sp. nov.
Creators
Description
Monocoryne antarctica sp. nov.
(Figs 3 A, 4; Table 2)
Material examined. Stn 126, one polyp, c. 13 mm long (holotype, NIWA 115613).
Description. 13-mm-long polyp (Fig. 3 A). Basal 9 mm devoid of tentacles, enveloped by thin perisarc. Basal 3 mm provided with anchoring filaments. Capitate tentacles, usually in groups of three, one of them usually more developed.
Gonophores absent.
Cnidome consisting of stenoteles in two size groups (Fig. 4 A–B), desmonemes (Fig. 4 A, D), fusiform microbasic mastigophores? (Fig. 4 B, D) and an unidentified, relatively large, tear-shaped type (Fig. 4 C).
Measurements (in µm). Cnidome: larger stenoteles [range 33– 36 x 30 –33, mean 34.8±1.0 x 31.6±0.8 (n=10); ratio, range 1.0–1.2, mean 1.1±0.1 (n=10)], smaller stenoteles [range 19– 21 x 15–16, mean 19.9±0.7 x 15.6±0.4 (n=10); ratio, range 1.2–1.4, mean 1.3±0.1 (n=10)], desmonemes [range 20–22 x 13.5–17, mean 20.8±0.7 x 14.6±0.9 (n=10); ratio, range 1.3–1.5, mean 1.4±0.1 (n=10)], microbasic mastigophores? [range 27– 30 x 13–15, mean 28.6±1.0 x 13.6±0.7 (n=10); ratio, range 1.9–2.3, mean 2.1±0.1 (n=10)], unidentified type [range 43– 48 x 20–25, mean 45.6±1.7 x 22.4±1.6 (n=12); ratio, range 1.9–2.2, mean 2.0±0.1 (n=12)].
Remarks. Notwithstanding the absence of gonophores, Monocoryne antarctica sp. nov. is recognizable by the cnidome (cf. Table 2). Only Monocoryne bracteata (Fraser, 1943) also has two size categories of stenoteles (Schuchert et al. 2016), although in Fraser’s species they are smaller, particularly the larger ones. The unidentified type of nematocysts in M. antarctica sp. nov. could correspond to the microbasic euryteles observed in Monocoryne gigantea (Bonnevie, 1899) and Monocoryne colonialis Brinckmann-Voss & Lindner, 2008, but if so they are larger in M. antarctica sp. nov. (cf. Table 2).
Monocoryne minor (4) Monocoryne sp.(3) Monocoryne antarcticum sp. nov.
Apart from the differences in the cnidome, there are geographical reasons to consider M. antarctica sp. nov. a different species. Monocoryne colonialis and M. bracteata are known from the North Pacific, M. gigantea from the North Atlantic and Monocoryne minor Millard, 1966 from South Africa. Only a species of Monocoryne, described as Monocoryne sp. by Stepanjants (1979), had been reported from Antarctic waters. Monocoryne antarctica sp. nov. can be distinguished from Stepanjants’ material by the cnidome, as only one category of stenoteles was described by her, microbasic euryteles or equivalent were not described, and the remaining shared nematocysts are distinctly larger in M. antarctica sp. nov. This species also differs from the other geographically close species, M. minor from South Africa, by the presence of only three categories of nematocysts, and their distinctly smaller size, in Millard’s species.
Ecology and distribution. Material collected at a depth of 159–161 m, off Cape Adare.
Etymology. The specific name “ antarctica ” refers to the Antarctic region where this species was found.
Notes
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Linked records
Additional details
Identifiers
Biodiversity
- Family
- Candelabridae
- Genus
- Monocoryne
- Kingdom
- Animalia
- Order
- Anthoathecata
- Phylum
- Cnidaria
- Species
- antarctica
- Taxonomic status
- sp. nov.
- Taxon rank
- species
- Taxonomic concept label
- Monocoryne antarctica CANTERO, 2017
References
- Fraser, C. M. (1943) New species of hydroids, mostly from the Atlantic Ocean, in the United States National Museum. Proceedings of the United States National Museum, 91, 77 - 89, pls. 13 - 17.
- Schuchert, P., Sanamyan, N. & Sanamyan, K. (2016) Observations on two large athecate hydroids (Cnidaria: Hydrozoa) from the Kamchatka Peninsula (NW Pacific). Revue suisse de Zoologie, 123 (1), 165 - 178.
- Bonnevie, K. (1899) Hydroida. Norske Nordhavs-Expedition 1876 - 1878, Zoologi, 26, 1 - 104, pls. 1 - 8, map.
- Brinckmann Voss, A. & Lindner, A. (2008) Monocoryne colonialis sp. nov., a colonial candelabrid hydroid (Cnidaria: Hydrozoa: Candelabridae) from the north Pacific. Journal of the Marine Biological Association of the United Kingdom, 88 (8), 1631 - 1635.
- Millard, N. A. H. (1966) The Hydrozoa of the south and west coasts of South Africa. Part III. The Gymnoblastea and small families of the Calyptoblastea. Annals of the South African Museum, 48 (18), 427 - 487, pl. 1.
- Stepanjants, S. D. (1979) Hydroids of the antarctic and subantarctic waters. In: Biological results of the Soviet Antarctic Expedition, 6. Issledovaniya Fauny Morei, 20 (30), 1 - 200, pls. 1 - 25. [in Russian]