Sertularella leiocarpa
Description
Sertularella leiocarpa (Allman, 1888)
Fig. 13L, M; Table 15
Sertularia leiocarpa Allman, 1888: 52, pl. 25 figs 1, 1a.
Sertularella leiocarpa. – Stechow, 1925: 477, fig. 35. – Galea, 2015: 9, fig. 3P.
Material examined: HRG-1056; Tristan da Cunha group of islands, E of Inaccessible I., -37.32000° 12.60000°, 160 m, coll. British Antarctic Survey, Stn. 80, lot DB12-0340; 24.05.2013; a ca. 5 cm high, sterile stem bearing a single side branch.
Description: Colonies up to ca. 7.5 cm high, arising from thin hydrorhizal fibers. Stems mono- or lightly polysiphonic basally, moderately stiff, giving rise to roughly alternate, coplanar side branches; stems and branches divided into moderately long, slender, geniculate internodes by means of indistinct oblique nodes; a hydrotheca confined to the distal end of each internode; side branches given off irregularly, directly (no apophyses present) and laterally from below a stem hydrotheca; up to 2nd order branches. Hydrothecae long, tubular, adnate for ca. 1/3rd their length to the corresponding internode, then curving gently outwards; abaxial wall almost straight, free adaxial wall slightly convex proximally, then nearly straight for most of its length; aperture facing outwards, provided with 4 small, triangular cusps separated by very shallow embayments; usually without intrathecal, submarginal cusps, but occasionally 2-4 present, one below each embayment; a 4-flapped operculum. Gonothecae arising from the stem internodes at level of hydrothecal bases, on opposite side to hydrotheca; spindle-shaped, walls entirely smooth, apically 3-4 short spines.
Dimensions: See Table 15.
Remarks: The colony shape and the gonotheca are illustrated by both Allman (1888) and Millard (1975). Although generally absent, internal, submarginal hydrothecal cusps may occasionally occur (Vervoort, 1966; Gili et al., 1989).
Distribution: Tristan da Cunha group of islands, Namibia, New Caledonia, New Zealand, as well as scattered records from the south and southeast Indian Ocean (Galea, 2015).
Notes
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Linked records
Additional details
Identifiers
Biodiversity
- Family
- Sertulariidae
- Genus
- Sertularella
- Kingdom
- Animalia
- Order
- Leptothecata
- Phylum
- Cnidaria
- Scientific name authorship
- Allman
- Species
- leiocarpa
- Taxon rank
- species
- Taxonomic concept label
- Sertularella leiocarpa (Allman, 1888) sec. Galea, Schories, Häussermann & Försterra, 2017
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 years 1873 - 76, Zoology 23 (70): 1 - 90.
- Stechow E. 1925. Hydroiden der Deutschen Tiefsee-Expedition. Wissenschaftliche Ergebnisse der Deutschen Tiefsee- Expedition auf dem Dampfer " Valdivia " 1898 - 1899 27: 383 - 546.
- Galea H. R. 2015. Hydroids (Cnidaria: Hydrozoa) from Tristan da Cunha and St. Helena. Marine Biodiversity Records 8 (e 154): 1 - 18.
- Millard N. A. H. 1975. Monograph on the Hydroida of southern Africa. Annals of the South African Museum 68: 1 - 513.
- Vervoort W. 1966. Bathyal and abyssal hydroids. Scientific Results of the Danish Deep - Sea Expedition 1950 - 1952. Galathea Report 8: 97 - 174.
- 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.