Sertularia leiocarpa Allman, 1888 : 52
Sertularella leiocarpa
Taxonomic revision of the genus Sertularella (Cnidaria: Hydrozoa) from southern South America and the subantarctic, with descriptions of five new species
Horia R. Galea
Dirk Schories
Verena Häussermann
Günter Försterra
Revue suisse de Zoologie
2017
2017-09-30
124
2
255
321
(Allman, 1888)
Allman
1888
[926,1341,646,670]
Hydrozoa
Sertulariidae
Sertularella
Animalia
Leptothecata
33
288
Cnidaria
species
leiocarpa
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. Table 15. Measurements of Sertularella leiocarpa(Allman, 1888), in μm. Stechow (1925) Vervoort (1966), schizoholotype Vervoort (1966), Galatheamaterial Gili et al. (1989) Internode - length - 1160-1880 1215-1350 800-1320 - diameter at node 300-470 240-260 150-300 150-180 Hydrotheca - free adaxial length 880-1040 800-860 675-900 480-600 - adnate adaxial length 560-620 400-560 410-450 - - abaxial length 960-1200 1040-1120 745-850 660-720 - maximum width 480-500 480-500 310-500 - - diameter at aperture 260-270 340-420 220-250 210-240 Gonotheca - total length - ca. 3260 - 1500-1650 - maximum width - ca. 1460 - - 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).