Halecium Oken 1815
Authors/Creators
Description
Halecium sp.
Figs. 19e, f
Material examined. Southwest Florida Shelf, middle shelf west of Gasparilla Island, 26°45.86’N, 83°21.44’W, 50 m, 18 July 1981, triangle dredge, one colony fragment, 3.9 cm high, without gonophores, coll. Continental Shelf Associates, ROMIZ B1594.— Sanibel Island, beach at Lighthouse Point, 26°26’58”N, 82°01’04.5”W, detached and stranded on beach, 21 March 2018, 22° C, 34.5‰, one colony, 7 cm high, with male gonophores, coll. D. Calder, ROMIZ B4381.
Remarks. These hydroids resemble the trophosomes of several species of Halecium Oken, 1815 that have been reported from the Gulf of Mexico (Calder & Cairns 2009), including H. halecinum (Linnaeus, 1758), H. beanii (Johnston, 1838), H. sessile Norman, 1867, H. macrocephalum Allman, 1877, and H. bermudense Congdon, 1907. In lacking female gonophores, the specimens cannot be reliably identified to species. Colonies were strongly polysiphonic, with alternate and predominantly pinnate side branches; hydranths bore 20+ tentacles and the cnidome comprised both pseudostenoteles (10.2–12.0 long x 5.4 – 7.0 μm wide) and microbasic mastigophores (ca. 6.0 long x 1.8 μm wide).
Notes
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Linked records
Additional details
Identifiers
Biodiversity
- Collection code
- ROMIZ
- Material sample ID
- B4381
- Event date
- 2018-03-21
- Verbatim event date
- 2018-03-21
- Scientific name authorship
- Oken
- Kingdom
- Animalia
- Phylum
- Cnidaria
- Order
- Leptothecata
- Family
- Haleciidae
- Genus
- Halecium
- Taxon rank
- genus
- Taxonomic concept label
- Halecium Oken, 1815 sec. Calder, 2019
References
- Oken, L. (1815) Okens Lehrbuch der Naturgeschichte. III. Theil. Zoologie. Vol. 1. Oken, Jena, 842 pp.
- Calder, D. R. & Cairns, S. D. (2009) Hydroids (Cnidaria: Hydrozoa) of the Gulf of Mexico. In: Felder, D. L. & Camp, D. K. (Eds.), Gulf of Mexico. Origin, waters, and biota. Vol. 1. Biodiversity. Texas A & M University Press, College Station, Texas, pp. 381 - 394.
- Linnaeus, C. (1758) Systema naturae per regna tria naturae, secundum classes, ordines, genera, species cum characteribus, differentiis, synonymis, locis. Editio decima, reformata. Laurentii Salvii, Holmiae, 823 pp. https: // doi. org / 10.5962 / bhl. title. 542
- Johnston, G. (1838) A history of the British zoophytes. W. H. Lizars, Edinburgh, 341 pp. https: // doi. org / 10.5962 / bhl. title. 110844
- Norman, A. M. (1867) Report of the committee appointed for the purpose of exploring the coasts of the Hebrides by means of the dredge. - Part II. On the Crustacea, Echinodermata, Polyzoa, Actinozoa, and Hydrozoa. Report of the British Association for the Advancement of Science, Nottingham, 1866, 193 - 206.
- Allman, G. J. (1877) Report on the Hydroida collected during the exploration of the Gulf Stream by L. F. de Pourtales, assistant United States Coast Survey. Memoirs of the Museum of Comparative Zoology at Harvard College, 5 (2), 1 - 66. https: // doi. org / 10.5962 / bhl. title. 15852
- Congdon, E. D. (1907) The hydroids of Bermuda. Proceedings of the American Academy of Arts and Sciences, 42, 463 - 485. https: // doi. org / 10.2307 / 20022242