Ventromma halecioides ( Alder, 1859 )

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-

Ventromma halecioides ( Alder, 1859)

Materials

Type status: Other material. Location: locality: La Concha ; minimumDepthInMeters: 0.5; maximumDepthInMeters: 1.0; Event: year: 2021; month: 6; day: 19; habitat: all macroalgae regions; Record Level: dataGeneralizations: 18 ° C; 36 PSU

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

Notes

Fig. 6 b

Type locality. Cullercoats and Roker, England ( Alder 1859).

Detailed description in Calder (1997), Peña-Cantero and García-Carrascosa (2002), Mendoza-Becerril et al. (2020).

Taxonomic status. Unaccepted (see Fig. 6 b remarks). AphiaID 117678.

Remarks. Recent molecular studies support the validity of species with sufficient genetic divergence from Kirchenpaueria, forming a sister clade to the rest of the family Kirchenpaueriidae ( Peña-Cantero et al. 2010, Maronna et al. 2016, Moura et al. 2018). Therefore, we follow this genetic evidence and the presence of bithalamic nematothecae (c. f. Calder 1997), we consider our specimens to belong to V. halecioides .

Diagnosis

Colony erect, with creeping hydrorhiza. Hydrocaulus branched, monosiphonic, divided at regular intervals into internodes, each with one distal nematotheca and one hydrocladial apophysis. Exoskeleton with a visible layer corresponding to perisarc. Hydrocladia alternate, unbranched, with up to four thecate internodes. Thecate internodes with a distal hydrotheca, a median inferior nematotheca and a median superior nematothecae. Hydrotheca cup-shaped with margin entire. 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.