Sertularella leiocarpoides Vervoort, 1993

Galea, Horia R., 2016, Notes on some sertulariid hydroids (Cnidaria: Hydrozoa) from the tropical western Pacific, with descriptions of nine new species, European Journal of Taxonomy 218, pp. 1-52 : 33-35

Sertularella leiocarpoides Vervoort, 1993

Figs 9 D–G, 10A; Table 5

Sertularella leiocarpoides Vervoort, 1993: 223 , fig. 49.

Material examined

BATHUS 2: Stn. CP737, a 5 cm high, sterile colony devoid of hydrorhiza (MNHN-IK-2012-16581).

BATHUS 3:Stn.DW829,a 3.5cm high colony fragment bearing one gonotheca(MNHN-IK-2012-16582); Stn. DW830, a 5 cm high and 7.5 cm wide sterile colony (MNHN-IK-2012-16583).

SALOMON 1: Stn. DW1741, a 2 cm high, sterile colony (MNHN-IK-2012-16584).

Remarks

The four available specimens were compared to a colony of Sertularella leiocarpa ( Allman, 1888) from Inaccessible Island (see Galea 2015b). Portions of three of them are illustrated altogether with S. leiocarpa , so as to show their specific differences (compare Fig. 5 D–F and 5G). As already noted by Vervoort (1993), the internodes are thick, short and geniculate in S. leiocarpoides , and comparatively more slender, longer, and less geniculate in S. leiocarpa . In addition, the hydrothecae of Vervoort’s species have the adaxial cusps characteristically upturned, and there are generally also two inconspicuous latero-adaxial, internal, submarginal projections of the perisarc and, occasionally, a third one, on the abaxial side.

Geographical distribution

New Caledonia ( Vervoort 1993; present study), Solomon Islands (present study).

Figures

Fig. 5. ― A–B. Gonaxia nova sp. nov. (MUSORSTOM 8, Stn. CP1083). A. Distalmost, monosiphonic part of a colony. B. Portion of stem with basal part of a cladium. ― C–G. Gonaxia scalariformis Vervoort, 1993, portions of stems and basal parts of cladia from BIOCAL, Stn. DW46 (C = colony #1; D = colony #2; E = colony #3), Stn. DW66 (F), and NORFOLK 1, Stn. DW1699 (G), showing discrete differences in shape and size. ― H. Gonaxia aff. similis Vervoort, 1993 (MUSORSTOM 6, Stn. DW423), portion of stem with cladium. Scale bars: A = 1 mm; B–H = 500 µm.