Hebella

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 : 16

Hebella sp. 2

( Fig. 4A , H)

Material examined. Stn. 8, 25.i.2012, 12– 15 m, M058: numerous hydrothecae, but no gonothecae, on stems of Diphasia digitalis (Busk, 1852) .

Description. Hydrothecae arising irregularly from linear stolon creeping on the hydrorhiza and both sides of stems of the hydroid host. Pedicels 185–490 µm long, with slightly wrinkled perisarc. Hydrothecae tubular, 1035– 1320 µm long, 475–560 µm wide, perisarc thin, smooth to slightly undulated; aperture tilted to one side, 635–780 µm wide, rim everted, margin occasionally renovated once. Hydranths with 20–24 tentacles. Gonothecae absent. Nematocysts: 1) egg-shaped microbasic heteronemes, ca. 2.3×1.6 µm, rarely occurring in the coenosarc; 2) microbasic mastigophores, (7.7–8.2)×(2.6–3.2) µm, abundant in the tentacles, also present in the coenosarc; 3) bean-shaped microbasic heteronemes, (11.9–12.3)×(3.7–4.2) µm, sparsely distributed in the coenosarc; 4) large microbasic heteronemes, (21.9–25.0)×(7.4–8.5) µm, of rare occurrence in the stolon.

Geographical distribution. Only known from Martinique.

Figures

FIGURE 4. A: Hebella sp. 2 ― hydrothecae. B: Hebella sp. 3 ― hydrothecae. C: Hebella sp. 4 ― hydrothecae. D – J: Comparison of the cnidomes of Anthohebella communis (Calder, 1991) (D), Hebella dyssymetra Billard, 1933 (E), Hebella scandens (Bale, 1888) (F), Hebella sp. 1 (G), Hebella sp. 2 (H), Hebella sp. 3 (I), Hebella sp. 4 (J). K – Q: Halecium dichotomum Allman, 1888 ― various stems (K); male (L, M) and female (N, P) gonothecae; aperture of a female gonotheca in frontal view, showing twin hydrotheca (O); cnidome (Q). Scale bars: 10 µm (D – J, Q), 300 µm (K – P), 500 µm (C), 1 mm (A, B).