Oswaldella incognita Pena Cantero, Svoboda and Vervoort 1997
Oswaldella incognita Peña Cantero, Svoboda and Vervoort, 1997 (figure 11) Oswaldella incognita Peña Cantero et al., 1997: 367–369, figure 8; Peña Cantero and Vervoort, 1998: 36; Peña Cantero and García Carrascosa, 1999: 212 et seq.; Peña Cantero and Marques, 1999: 85. Oswaldella antarctica: Peña Can...
| Main Authors: | , |
|---|---|
| Format: | Other/Unknown Material |
| Language: | unknown |
| Published: |
2004
|
| Subjects: | |
| Online Access: | https://zenodo.org/record/4654029 https://doi.org/10.5281/zenodo.4654029 |
| Summary: | Oswaldella incognita Peña Cantero, Svoboda and Vervoort, 1997 (figure 11) Oswaldella incognita Peña Cantero et al., 1997: 367–369, figure 8; Peña Cantero and Vervoort, 1998: 36; Peña Cantero and García Carrascosa, 1999: 212 et seq.; Peña Cantero and Marques, 1999: 85. Oswaldella antarctica: Peña Cantero, 1991: 168, pls 31, 56, pl. 68 figure a; Peña Cantero and García Carrascosa, 1994: 125, figure 8 a–c; 1995: 96–101, figures 43A–E, 44A–F, 64E. Material examined. 691/023, one stem ca 35 mm high, with a single hydrocladium (USNM 1003334); 691/27, two stems and one stem fragment up to 80 mm high, with male gonothecae (USNM 1003335; RMNH-Coel. 30216; MNCN 2.03 / 236); 7/484, two stems up to 60 mm high (USNM 1003336); 721/776, one basally broken stem ca 60 mm high, with male gonothecae (USNM 1003337); 721/801, one stem ca 48 mm high (USNM 1003338). Description. Colonies composed of monosiphonic and unbranched stems (forked in the material from Stn 7 / 484), provided with apophyses alternately arranged in one plane and forming two longitudinal series. Apophyses directed upwards at an angle of ca 45 °. Stem divided into internodes with one apophysis each. Cauline apophyses supporting hydrocladia; up to second-order hydrocladia present (figure 11A). Node separating cauline apophyses and hydrocladia inconspicuous (figure 11B). Cauline apophyses provided with two axillary nematophores, each emerging through an axillary perisarc hole (figure 11B); 'mamelons' absent. Top of distal hydrocladial internodes truncated. Hydrocladia homomerously segmented; internodes each with one hydrotheca and two nematophores (figure 11 C–G): one mesial inferior emerging through a perisarc hole on a slight elevation of the internode and provided with a scale-shaped nematotheca, and one mesial superior emerging through a perisarc hole situated behind the free adcauline hydrothecal wall. Hydrothecae placed either in middle of hydrocladial internode or on its distal half (figure 11A, C–G). Hydrotheca elongate, with circular aperture slightly ... |
|---|