Halecium dichotomum Allman 1888
Creators
Description
Halecium dichotomum Allman, 1888
(Fig. 4 K–Q)
Halecium dichotomum Allman, 1888: 13, pl. 6.― Billard, 1910: 4.― Stechow, 1925:419.― Millard, 1957: 188; 1966: 466, fig. 10A–K; 1968: 256; 1975: 147, fig. 48A–G.― Migotto, 1996: 31, fig. 6F, G.
not Halecium cf. dichotomum ― Gili et al., 1989: 78, fig. 8.
Material examined. Stn. 2, 22.ii.2012, 1 m, M245: small female and male colonies on Sertularella diaphana (Allman, 1885).
Remarks. No dichotomic arrangement of the lateral hydrophores, so characteristic of Allman's (1888) species, could be seen in this epizoic material with dwarfed, poorly developed colonies. However, the presence of both male and female gonothecae support this correct identification. The perisarc of gonothecae of both sexes has a filmy appearance and is easily collapsible, and wrinkled surfaces are less regularly marked than in earlier accounts (Millard 1966, Migotto 1996), especially in males.
Two types of nematocysts occur in this species (Fig. 3 Q): 1) microbasic mastigophores, ca. 5.9×1.6 µm, abundant in the tentacles, also scattered in the coenosarc; 2) larger and wider capsules with conspicuous shaft, (8.8–9.3)×(3.7–4.0) µm, occurring in the coenosarc. Since no discharged capsules of the latter type were found, I follow Migotto (1996) in considering them to be pseudostenoteles.
Geographical distribution. South Africa (Allman 1888; Stechow 1925; Millard 1975), Brazil (Migotto 1996), eastern Caribbean (present study).
Notes
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Linked records
Additional details
Identifiers
Biodiversity
- Family
- Haleciidae
- Genus
- Halecium
- Kingdom
- Animalia
- Order
- Leptothecata
- Phylum
- Cnidaria
- Scientific name authorship
- Allman
- Species
- dichotomum
- Taxon rank
- species
- Taxonomic concept label
- Halecium dichotomum Allman, 1888 sec. Galea, 2013
References
- Allman, G. J. (1888) Report on the Hydroida dredged by H. M. S. Challenger during the years 1873 - 76. Part II. - The Tubularinae, Corymorphinae, Campanularinae, Sertularinae and Thalamophora. Report on the Scientific Results of the Voyage of H. M. S. Challenger during the year 1873 - 76, Zoology, 23 (70), 1 - 90.
- Billard, A. (1910) Revision d'une partie de la collection des hydroides du British Museum. Annales des Sciences Naturelles, Zoologie, 11 (9), 1 - 67.
- Stechow, E. (1925) Hydroiden der Deutschen Tiefsee-Expedition. Wissenschaftliche Ergebnisse der Deutschen Tiefsee- Expedition auf dem Dampfer " Valdivia " 1898 - 1899, 27, 383 - 546. http: // dx. doi. org / 10.1038 / 078267 a 0
- Millard, N. A. H. (1957) The Hydrozoa of False Bay, South Africa. Annals of the South African Museum, 43 (4) (6), 173 - 243.
- Migotto, A. E. (1996) Benthic shallow-water hydroids (Cnidaria, Hydrozoa) of the coast of Sao Sebastiao, Brazil, including a checklist of Brazilian hydroids. Zoologische Verhandelingen, Leiden, 306, 1 - 125.
- Gili, J. M., Vervoort, W. & Pages, F. (1989) Hydroids from the west African coast: Guinea Bissau, Namibia and South Africa. Scientia Marina, 53 (1), 67 - 112.
- 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.