Oswaldella laertesi Peña Cantero, 2007

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 : 412-416

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.6107467

persistent identifier

https://treatment.plazi.org/id/03C287C6-2800-7C19-D4F4-8C6C2F3E7A41

treatment provided by

Plazi

scientific name

Oswaldella laertesi Peña Cantero, 2007
status

 

Oswaldella laertesi Peña Cantero, 2007 View in CoL

( Figs 9 View FIGURE 9 , 16 View FIGURE 16 I, 18A, 20A)

Material examined. New Zealand Antarctic Expedition TAN0802: Stn 17, Tangaroa , 9 February 2008, 73°07'47''S, 174°19'23''E (Ross Sea, Cape Adare), 321 m ( NIWA 35536); Stn 117, Tangaroa , 21 February 2008, 72°35'41.99''S, 175°20'53"E (Ross Sea, Cape Adare), 479– 475m ( NIWA 37198).

Description. Polysiphonic, unbranched stems, up to 100 mm high, irregularly divided into internodes. Three longitudinal rows of cauline apophyses ( Fig. 9 View FIGURE 9 F). Cauline apophyses with five to six nematophores: three to four axillary ones, provided with distinct, collar-shaped nematotheca, and two extra nematophores, each emerging through ‘mamelon’ ( Fig. 9 View FIGURE 9 B, F).

Hydrocladia much branched ( Fig. 9 View FIGURE 9 A), with up to third-order hydrocladia. First hydrocladial internode bifurcated, with two similar prongs ( Fig. 9 View FIGURE 9 A). Mesial inferior nematophore emerging from strongly marked swelling at proximal third of internode ( Fig. 9 View FIGURE 9 C); with well-developed nematotheca ( Fig. 9 View FIGURE 9 C–E). Hydrotheca placed on middle of internode or at its distal half ( Fig. 9 View FIGURE 9 C–D). Hydrotheca low, as high as wide. Adcauline hydrothecal wall with small, but distinct, free portion. Abcauline wall straight ( Fig. 9 View FIGURE 9 C). Hydrothecal aperture circular, perpendicular to long axis of internode ( Fig. 9 View FIGURE 9 C–D); rim even, sometimes with slight adcauline elevation.

Male gonotheca fusiform, with sub-terminal oval aperture ( Fig. 9 View FIGURE 9 G).

Remarks. The most remarkable result from the SEM study of this species is the finding of undescribed, distinct, collar-shaped nematothecae in the axillary nematophores of the cauline apophyses.

Variability in the number of axillary nematophores, found in Oswaldella laertesi and in certain other species of the genus (e.g. Oswaldella niobae ), could be due to fusion.

NIWA

National Institute of Water and Atmospheric Research

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