Obelia tenuis Fraser, 1938

Mendoza-Becerril, María A., Murillo-Torres, Paulina, Serviere-Zaragoza, Elisa, León-Cisneros, Karla, Mazariegos-Villarreal, Alejandra, López-Vivas, Juan Manuel & Agüero, José, 2024, First records of hydroid epibionts on the introduced macroalga Gracilaria parvispora in the Mexican Pacific, Biodiversity Data Journal 12, pp. e 130248-e 130248 : e130248-

Obelia tenuis Fraser, 1938

Materials

Type status: Other material. Location: locality: La Concha ; minimumDepthInMeters: 0.5; maximumDepthInMeters: 1.0; Event: year: 2022; month: 2; day: 11; habitat: middle macroalgae regions; Record Level: dataGeneralizations: 18 ° C; 36 PSU

Notes

Fig. 6 g

Type locality. Ecuador: Santa Elena Bay ( Calder et al. 2009).

Detailed description in Mendoza-Becerril et al. (2020).

Taxonomic status. Accepted. AphiaID 832333.

Remarks. Recent morphological studies support the validity of species with sufficient support. Therefore, we follow the morphological evidence indicated in Mendoza-Becerril et al. (2020).

Diagnosis

Colonies erect, sympodial and branching. Stem monosiphonic, divided into nodes and internodes. Internodes with annulations at the base and distal apophysis alternately given off the hydrothecal pedicel or branches. Hydrothecal pedicels are short, with annulations throughout. Hydrothecae with a margin slightly waived or with fine longitudinal folds. Hydrothecal diaphragm straight to slightly oblique. Without gonothecae.

Figures

Figure 6. Hydrozoan epibionts. a Corydendrium sp.: part of hydrocaulus with two hydranths, scale equals 0.5 mm; b Ventromma halecioides: part of a hydrocaulus with the proximal end of a hydrocladium, hydrothecae, nematothecae, scale equals 0.3 mm; c Plumularia floridana: part of a hydrocaulus with the proximal end of a hydrocladium, hydrothecae and nematothecae, scale equals 0.1 mm; d Clytia linearis: part of hydrocaulus with hydrothecae, scale equals 0.8 mm; e Obelia cf. dichotoma: part of hydrocaulus with hydrothecae, scale equals 0.2 mm; f Obelia oxydentata: part of hydrocaulus with hydrothecae, scale equals 0.3 mm; g Obelia tenuis: part of hydrocaulus with a hydrotheca, scale equals 0.1 mm.