Parathyonidium incertum Heding
Parathyonidium incertum Heding Figure 1 d–f; table 1. Parathyonidium incertum Heding (in Heding & Panning, 1954): 37–39, fig. 3. Material examined. Antarctic Peninsula, Low I., BENTART–2006, R/V Hesperides , stn LOW47, 63.4668ºS, 62.2151ºW, 115 m, 12 Feb 2006, MNCN 29.04/126 (1 specimen), body w...
| Main Authors: | , , |
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| Format: | Other/Unknown Material |
| Language: | unknown |
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Zenodo
2009
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| Online Access: | https://doi.org/10.5281/zenodo.6219730 http://treatment.plazi.org/id/F31587C2795DFF9B9FDEFD4D15881014 |
| Summary: | Parathyonidium incertum Heding Figure 1 d–f; table 1. Parathyonidium incertum Heding (in Heding & Panning, 1954): 37–39, fig. 3. Material examined. Antarctic Peninsula, Low I., BENTART–2006, R/V Hesperides , stn LOW47, 63.4668ºS, 62.2151ºW, 115 m, 12 Feb 2006, MNCN 29.04/126 (1 specimen), body wall ossicles slide NMV F161525; MNCN 29.04/127 (2 specimens), posterior body ossicles slide F161526, tentacle ossicles slide F161527; South Atlantic Ocean, South Georgia, Icefish 2004, stn 47 BT 25, 114–118 m, 12 Jun 2004, NMV F104998 (1). Diagnosis. Specimens up to 35 mm long (tentacles partly extended, preserved, NMV F104998), subcylindrical, elongate, widest diameter 5 mm; soft thick non-calcareous body wall; lacking distinct sole ventrally; oral end sometimes upright, slightly tapered and rounded distally when tentacles withdrawn; anal end slightly tapered and rounded distally; 15 dendritic tentacles (variable; “ type ” has 13; F104998 has 16), unequal, some undeveloped (buds only); long digitiform genital papilla posterior to dorsal tentacle pair in male specimen (indicative of internal fertilization and brood protection); tube feet confined to radii, spaced single series of large tube feet, uniform in size from base of tentacles to anus; calcareous ring faintly evident, only radial plates evident, wide anteriorly and posteriorly, narrowed in mid-plate, 2 small notches anteriorly, deep rounded notch posteriorly. Ossicles in body wall abundant, thin, bluntly spinous to smooth, single-layered irregular plates, few to many perforations; similar dorsally and ventrally; common form elongate, with 2 large central perforations, 2 small distal perforations, one extended end with few small perforations, short blunt spines on surface and around margin, typically 100 µ m long; small plates intergrade with larger smooth to knobbed, marginally denticulate plates, up to 200 µ m long. Tube foot endplates large, up to 360 µ m diameter, few perforated support plates, not rods. Tentacles ossicles perforated plates, not rods, round ... |
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