Halecium ovatum Totton 1930
Creators
Description
Halecium ovatum Totton, 1930
Figure 8A, B
Halecium ovatum Totton, 1930: 143, fig. 3.- Vervoort, 1972: 339, fig. 1.- Stepanjants, 1979: 103, pl. 20 fig. 1a-g.- Peña Cantero, 1991: 48, pl. 2, figs g-h.- Blanco, 1994: 160: 156.- Blanco, 1994: 187.- Peña Cantero and García Carrascosa, 1996: 12, fig. 2G-H.- Peña Cantero and García Carrasocosa, 1999: 63: 212 et seq.- Watson, 2003: 166, fig. 15 D,E.- Vervoort and Watson, 2003: 86.
Notes and supplementary description from holotype. To establish the identity of Halecium interpolatum it became necessary to examine type material of Halecium ovatum. Although Totton provided an adequate description and dimensions of Halecium ovatum his figures were poor, and the gonotheca was not figured. Ihave compared the BANZARE material with the holotype (alcohol-preserved colony) and four paratype microslide preparations of Halecium ovatum loaned bythe Natural History Museum, London.Abrief supplementary description of the important diagnostic characters from the holotype (glycerol-mounted) of Halecium ovatum is given.
The holotype colony (BMNH No.29.10.10.1) comprises a dense tuft of long and short stems growing on another hydroid. Hydrocauli arise from a tangled adherent meshwork of tubular stolons entwined with hydrorhizae of the other hydroid.
Shorter stems monosiphonic, taller stems fascicled with up to 10 polysiphonic tubes; stems arborescently branched in all directions up to two thirds of their length, ultimate branches monosiphonic.
Mature female gonothecae small, borne abundantly on all but distalmost branches, inserted on a short pedicel in a hydrotheca typically situated in a fork between two or three branches but hydrotheca often overgrown by polysiphonic tubes; body of gonotheca ovoid to subquadrangular with a very thin, smooth perisarc; aperture terminal, small, circular, surrounded by a very low fragile collar; immature gonotheca kidney-shaped as described by Totton.
Nematocysts in tentacles undischarged?anisorhizas capsule oval, 11–12 x 6–7 μm.
Measurements (μm) of gonotheca of Halecium ovatum
Length of pedicel of gonotheca 80 Length of gonotheca 784 – 1176 Width of gonotheca 588 – 901 Diameter of orifice 80
Notes
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Linked records
Additional details
Identifiers
Biodiversity
- Collection code
- BMNH
- Family
- Haleciidae
- Genus
- Halecium
- Kingdom
- Animalia
- Order
- Leptothecata
- Phylum
- Cnidaria
- Scientific name authorship
- Totton
- Species
- ovatum
- Taxon rank
- species
- Type status
- holotype
- Taxonomic concept label
- Halecium ovatum Totton, 1930 sec. Watson, 2008
References
- Totton, A. K. 1930. Coelenterata. Part V. Hydroida. Natural History Report. British Antarctic Terra Nova Expedition 1910, Zoology 5: 131 - 252.
- Vervoort, W. 1972. Hydroids from the Theta, Vema and Yelcho cruises of the Lamont-Doherty Geological Observatory. Zoologische Verhandelingen, Leiden 120: 1 - 247.
- Stepanjants, S. D. 1979. Gidroidy vod antarktiki i subantarktiki. In Rezul'taty biologicheskikh issledovanii Sovetskikh Antarkticheskikh Ekspeditsii, 6. Issledovaniya Fauny Morei 22: 1 - 99.
- Blanco, O. M. 1994 a. Claves de familias y generos para facilitar el reconocimiento de los Hydroida (Leptolina) Athecata, Thecata y LimnomedusaeArgentinos (generacionpolipoideexclusivamente). Revista del Museo de La Plata, new series 14, Zoologia 160: 147 - 179.
- Pena Cantero, A. L., and Garcia Carrascosa A. M. 1996. Hidrozoos bentonicos de la campana Antartida 8611. Instituto Espanol de Oceanografia. Publicaciones Especiales 19: 1 - 147.
- Pena Cantero A. L., and Garcia Carrasocosa, A. M. 1999. Biogeographical distribution of the benthic thecate hydroids collected during the Spanish ' Antartida 8611 ' expedition and comparison between Antarctic and Magellan benthic hydroid faunas. Scientia Marina 63 (suppl. 1): 209 - 218.
- Watson, J. E. 2003. Deep-water hydroids (Hydrozoa: Leptolida) from Macquarie Island. Memoirs of Museum Victoria 60: 151 - 180.
- Vervoort, W., and Watson, J. E. 2003. The Marine fauna of New Zealand: Leptothecata (Cnidaria: Hydrozoa) (Thecate Hydroids). NIWA Biodiversity Memoir 119: 1 - 537.