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. 1

Fig. 6A

Description: Colonies stolonal with few elongated gastrozooids 0.62–1.1 mm high, 0.12–0.2 mm wide. The basal portion of the polyp looks like a pedicel, annulated at the base becoming cylindrical to fusiform in the distal portion. One whorl of 8–12 filiform tentacles. Hypostome dome-shaped.

Material examined: SE – few infertile colonies from the dry season.

Stations: SE – C1P12, C1P34, C1P56, C2P34, C2P56.

Remarks: Found mainly on the plates but also on Ascidiacea, 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.