Sertularelloides cylindritheca ( Allman, 1888 )

Galea, Horia R., 2013, New additions to the shallow-water hydroids (Cnidaria: Hydrozoa) of the French Lesser Antilles: Martinique, Zootaxa 3686 (1), pp. 1-50 : 24

Sertularelloides cylindritheca ( Allman, 1888)

( Fig. 6 N–P)

Material examined. Stn. 1, 18.ii.2012, 13 m, M214: several infertile stems, 7–12 mm high (MHNG-INVE- 82940); 26.ii.2012, 10– 15 m, M261: a single sterile stem, 18 mm high (MHNG-INVE-82941); M265: several sterile stems, 11–22 mm high (MHNG-INVE-82942); M271: a single sterile stem, 20 mm high (MHNG-INVE- 82943).

Remarks. For the synonymy of this species, refer to Medel & Vervoort (1998). As noted by Kramp (1947, as Cnidoscyphus macrotheca sp. nov.), the hydrothecae are borne on a short, distal apophysis of the stem/branch internodes, and its cavity "is separated from that of the internodium by a strong chitinous septum, perforated by the coenosarc". This structure ( Fig. 6 O), as well as the presence of short stem apophyses supporting sessile hydrothecae, justify the assignement of this species to the genus Sertularelloides Leloup, 1937 .

Geographical distribution. Subtropical and tropical waters of eastern and western Atlantic (Medel & Vervoort 1998). The Caribbean records are summarized by Calder & Kirkendale (2005); to these, it should be added the present record from Martinique.

Figures

FIGURE 6. A, B: Diphasia digitalis (Busk, 1852) ― stem internode in frontal (left) and lateral (right) views (A); optical cross section through internode at level of hydrothecal apertures (B). C – G, J – M: Sertularella calderi sp. nov. ― fragments of stem (C, D); hydrothecae (E) and aperture viewed from above (F); comparison of the hydrotheca (G) with those of S. fraseri Galea, 2010 a (H) and S. peculiaris Leloup, 1974 (I); male (J) and female (K) gonothecae; apertures of male (L) and female (M) gonothecae viewed laterally (below) and apically (above). N – P: Sertularelloides cylindritheca (Allman, 1888) ― internodes (N); lateral view of hydrotheca (O) with thickened internal ring of perisarc at base of apophysis (right), and frontal view of the latter (left); apical view of hydrotheca (P). Q – T: Thyroscyphus longicaulis Splettstösser, 1929 ― fragment of stem (Q); internode and hydrotheca (R); aperture (S); male (left) and female (right) gonothecae (T). U – Z: Hincksella formosa (Fewkes, 1881) ― hydrotheca (U); gonotheca seen laterally (V), and in optical cross section (X); aperture (Y). Scale bars: 10 µm (Z), 200 µm (F, L, M), 300 µm (P), 500 µm (A, B, E, G – I, O, S, U, Y), 1 mm (C, D, J, K, N, R, T, V, X), 4 mm (Q).