Zanclea migottoi Galea, 2008

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 : 8-9

Zanclea migottoi Galea, 2008 Fig. 3D–F

Zanclea costata – Migotto, 1996: 20, figs 5A–C (not Zanclea costata Gegenbaur, 1857: 229 , pl. 8, figs 4–6).

Zanclea cf. alba – Vervoort, 2006: 200, fig. 1A, B, 2.1–2.3 [not Zanclea alba sensu Calder (1988 b) = Acrochordium album Meyen, 1834: 165 , pl. 28, fig. 8].

Zanclea migottoi Galea, 2008: 14–16 , figs 3J–L, tab. 1–2.

Description: Colony stolonal, polyps up to 2 mm high, arising from a simple creeping hydrorhiza. Stem 312–803 µm high, and width increasing from 74–78 µm in the basal portion to 79–138 µm at the distal portion. Perisarc wrinkled only at the basal portion of the stem. Hydranth cylindrical, 0.83–1.22 mm high, 0.15–0.19 mm wide, with a short rounded hypostome. Tentacles capitate arranged in a whorl of six in the oral region and 25–42 spread over the body of hydranth. Medusa buds (eumedusoids) well developed in three polyps, 66–172 µm high and 62–166 µm wide, in small groups of 2 to 4, inserted close to the base of the hydranth, between tentacles. Nematocysts: stenoteles of two size classes, the larger ones undischarged (7.3–10.9 × 7.1–9.6 µm), and discharged (8.1–9.3 × 7.3–8.5 µm); the smaller ones undischarged (4.2–6.9 × 3.9–6.3 µm), found in the tentacles, hydranth body, stem, and hydrorhiza; macrobasic euryteles undischarged (15.5–16.9 × 4.8-5.7 µm), abundant in the stem and hydrorhiza, few found in the hydranth body, forming groups of 2–3 at the base of the tentacles and in the medusa buds.

Material examined: VB – one colony with three polyps from the dry season, two of them with medusa buds; CZUFS CNI-00076.

Station: VB – C2P12.

Distribution: Brazil – Oliveira et al. (2016) considered Z. migottoi as a synonym of Z. costata , but only for the Southeast and South records (Espírito Santo to São Paulo and the Rio Grande do Sul) (Vanucci 1957, Navas-Pereira 1984, Migotto 1996, Migotto et al. 2002, Oliveira et al. 2006, Oliveira and Marques 2007, Shimabukuro 2007), making necessary a review of the other records for Z. costata to Brazil. World distribution – Azores ( Vervoort 2006) and Caribbean ( Galea 2008).

Remarks: Before the description of Z. migottoi by Galea (2008), two species of Zanclea were reported for the Brazilian coast, Z. costata Gegenbaur, 1857 , for several locations from the northeastern to the southern regions ( Navas-Pereira 1984, Migotto 1996, Neuman-Leitão et al. 2008, Oliveira et al. 2006, Silveira and Morandini 2011), and Z. protecta Hastings, 1932 , recorded only to Espírito Santo ( Grohmann 2006). However, Galea (2008) on describing Z. migottoi specimens from Guadeloupe compared them with those of Z. costata found by Migotto (1996) and concluded that both were the same species. He also added that the records of Z. costata for the Atlantic should be revised since this species could be restricted to the Mediterranean. Galea (2008) describes two essential characteristics for the designation of the new species, also present in the Migotto (1996) specimens: the groups of 2–5 macrobasic euryteles at the base of the tentacles and the absence of microbasic mastigophores, which are present in the Mediterranean Zanclea costata . These two characters were identified in the specimens from the Vaza-Barris River, which resembles Z. migottoi also by two size classes of stenoteles at the top of the tentacles. The VB specimens are more similar to those described and illustrated by Migotto (1996) than to those presented by Galea (2008); however, the complementation of his description, including new information about the cnidome, confirmed the identification of Z. migottoi in the present study.

Remarks: The only colony sampled was colonizing a plate.

Figures

Figure 3. (A) Cladocoryne floccosa, detail of a polyp showing a hydranth with gonophore (red arrow); (B) Coryne sp. 1 general view of a polyp; (C) Coryne sp. 2 general view of a polyp; (D-F) Zanclea migottoi: (D) general view of two polyps, one of them with gonophores (red arrow); (E) detail of the medial portion of the hydranth showing a group of nematocysts at the tentacle base (circle) and a discharged nematocyst (red arrow); (F) detail of the hydranth with two undischarged nematocysts (red arrows).