Taxonomic revision of the genus Sertularella (Cnidaria: Hydrozoa) from southern South America and the subantarctic, with descriptions of five new species Author Horia R. Galea Author Dirk Schories Author Verena Häussermann Author Günter Försterra text Revue suisse de Zoologie 2017 2017-09-30 124 2 255 321 journal article 31805 10.5281/zenodo.893519 10de215a-77ca-4e81-8c6b-a603108c4181 0035-418 893519

Table 10. Comparison of the available data on type materials of S. gaudichaudi (Lamouroux, 1824) and S. picta (Meyen, 1834). “Ba” stands for Billard (1909), “Bb” for Billard (1922), “Bc.” for Billard (1924), “H” for Hartlaub (1901), “L” for Lamouroux (1824), “M” for Meyen (1834), and “R” for Ramil et al. (1992).

	Sertularella gaudichaudi (Lamouroux, 1824)	Sertularella picta (Meyen, 1834)
Origin of the specimens	Vicinity of the Falkland Islands (L)	Eastern coast of Tierra del Fuego and the Falkland Islands (M).
Colony structure	Shrub-like, 1.5 to 2 inches high, with numerous alternate branches (L). Holotype 6.5 cm high, as high as broad, flabelliform, profusely and irregularly ramified (Bb)	“6 to 8 inches, and over” (M). Growth very ample, reminiscent of Obelia longissima (H).
Habit of the stem	Lightly fascicled (Bb)	Lightly fascicled (H).
Color	Greenish yellow to bluish green; hydranths pale blue (L)	“of a beautiful yellow, sometimes pale red” (M)
Internodes	Long, with the hydrothecae “very remote from each other” (L). Proximally with 1-2 annuli, not always distinct (Ba).	Typically very long, geniculate, strikingly resembling those of S. gaudichaudi (H).
Branches	With several annuli at origin from stem (Ba). Branchlets pinnately arranged, originating from below bases of successive hydrothecae, occasionally every 2-4 hydrothecae (Bb).	Each stem internode provides an origin for a side branch (H). Branches “strongly annulated” basally (i.e. several annuli) (H).
Hydrothecae	Not in the same plane (Ba, Bb), angle varying between 90-180° (Bb); adnate for 1/3rd, swollen adaxially, aperture on a constricted neck region, rim thickened though not always so (Bb); abcauline cusp produced; 3 internal, submarginal cusps (2 latero-adaxial, 1 abaxial) (Ba, Bb), not always present (Bc).	Not in the same plane (H). Adnate for 1/3rd, swollen adaxially, rim thickened (H). Perisarc thickened (M).
Gonothecae	Profuse, nearly globular, walls transversely annulated in upper half (L, Ba, Bb); aperture surrounded by 3-4 blunt cusps, indistinct in young thecae (Ba, Bb)	Wall annulated, with 4 apical projections (M), the latter not always obvious (H).