Hydractiniidae, L. Agassiz, 1862

Castro Mendonça, Luana M., Parisotto Guimarães, Carmen R. & Haddad, Maria A., 2022, Taxonomy and diversity of hydroids (Cnidaria: Hydrozoa) of Sergipe, Northeast Brazil, Zoologia (e 21032) 39, pp. 1-65 : 14

Hydractiniidae sp. 2

Fig. 6B–D

Description: Colony stolonal. Gastrozooids cylindrical, 0.47–0.85 mm high, 0.12–0.37 mm wide, with a whorl of 8–10 filiform tentacles.Hypostome dome-shaped.Tentaculozooids 0.66– 1.36 mm high and 20–23 µm wide, with numerous nematocysts (unidentified) (23.6–26.4 × 8.5–10.5 µm). Nematocysts microbasic euryteles undischarged (7.7–8.4 × 3.7–4 µm) in the hydranth.

Material examined: VB – few infertile colonies from the dry and rainy seasons.

Stations: VB – C1P12, C1P56, C2P12, C2P34, C2P56.

Remarks: Colonizing the plates, Ascidiacea, Bryozoa, Ostreidae , and Pennaria disticha (hydrorhiza).

Figures

Figure 6. (A) Hydractiniidae sp. 1: general view of a polyp; (B-D) Hydractiniidae sp. 2: (B) general view of three polyps and a tentaculozooid (red arrow); (C) detail of the tentaculozooid with nematocysts; (D) general view of a colony.