Oswaldella grandis Peña Cantero, Svoboda & Vervoort, 1997

Molinero, A. González & Peña Cantero, A. L., 2015, SEM study of species of Oswaldella Stechow, 1919 (Cnidaria, Hydrozoa, Kirchenpaueriidae), with an annotated checklist of the species of the genus, Zootaxa 4052 (4), pp. 401-441 : 412

publication ID

https://doi.org/ 10.11646/zootaxa.4052.4.1

publication LSID

lsid:zoobank.org:pub:47EF6E9D-9064-4899-B3DD-276FF7C969EB

DOI

https://doi.org/10.5281/zenodo.6107459

persistent identifier

https://treatment.plazi.org/id/03C287C6-2800-7C1D-D4F4-8A862EC07BB2

treatment provided by

Plazi

scientific name

Oswaldella grandis Peña Cantero, Svoboda & Vervoort, 1997
status

 

Oswaldella grandis Peña Cantero, Svoboda & Vervoort, 1997 View in CoL

( Figs 7 View FIGURE 7 , 16 View FIGURE 16 G, 17G, 19G)

Material examined. Spanish Antarctic Expedition Antártida 8611: Stn NA 172, 61°01'S – 60°58'S, 55°34'– 55°56'W (Elephant Island, South Shetland Islands) (Department of Zoology, University of Valencia, ANT NA 172).

Description. Polysiphonic, unbranched stems, up to 500 mm high, usually divided into internodes. Angle between cauline apophyses and stem ca. 45°. Cauline apophyses with four to five nematophores, two to three axillary ones, each emerging through simple hole in perisarc, and other two nematophores, each emerging through ‘mamelon’ ( Fig. 7 View FIGURE 7 B–C).

Hydrocladia much branched ( Fig. 7 View FIGURE 7 A), with up to third-order hydrocladia. First hydrocladial internode bifurcated ( Fig. 7 View FIGURE 7 A), with two similar prongs. Mesial-inferior nematophore typically with much reduced nematotheca, though not existent in present material ( Fig. 7 View FIGURE 7 D–F). Unforked hydrocladial internodes without infrathecal swelling. Hydrotheca placed on distal half of internode ( Fig. 7 View FIGURE 7 D–E). Hydrotheca low, about as high as wide. Abcauline hydrothecal wall straight. Hydrothecal aperture circular, perpendicular to longitudinal axis of internode; rim even ( Fig. 7 View FIGURE 7 D–E).

Male gonothecae almost cylindrical, with subterminal opening. Female larger, club-shaped, with subterminal aperture.

Remarks. Peña Cantero & García Carrascosa (1995) did not find any mesial inferior nematothecae when they examined this material, a pattern corroborated herein by SEM analysis. As Peña Cantero & García Carrascosa (1995) indicated, this could be related with the poor condition of the material with just a few hydrocladia left.

Until now only two axillary nematophores in the cauline apophyses had been described for this species. However, we observed three with the central one being larger and sometimes with the appearance of being the result of coalescence of two central ones ( Fig. 7 View FIGURE 7 C).

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