Polyclinidae
Polyclinidae Aplidium balleniae Monniot & Monniot, 1983 (Figure 4) Monniot & Monniot, 1983: 13 fig. 2 B, C, D. Primo & Vazquez 2007: 1777 fig. 2. Stations: 5-12 - 14-22 - 61. One or several elongated lobes are united at their base. Each lobe is composed of a thick short peduncle and a so...
| Main Authors: | , , , , |
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| Format: | Other/Unknown Material |
| Language: | unknown |
| Published: |
2011
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| Subjects: | |
| Online Access: | https://zenodo.org/record/6187332 https://doi.org/10.5281/zenodo.6187332 |
| Summary: | Polyclinidae Aplidium balleniae Monniot & Monniot, 1983 (Figure 4) Monniot & Monniot, 1983: 13 fig. 2 B, C, D. Primo & Vazquez 2007: 1777 fig. 2. Stations: 5-12 - 14-22 - 61. One or several elongated lobes are united at their base. Each lobe is composed of a thick short peduncle and a softer head (Fig. 4). The tunic is encrusted with fine sand, but allows seeing long double rows of zooids. The common cloacal openings are apical but some can also be found on the lateral sides of the lobes. It is difficult to extract the zooids from the resistant vitreous tunic containing thin mineral particles. The oral siphon has 6 lobes. The atrial opening is wide; it begins at the level of the 3 th or 4 th stigmata row to end at half-length of the thorax. The languet with 3 teeth is longer near the common cloacal aperture. The branchial sac has 18 to 22 rows of 10 stigmata on each side. The 5 stomach folds are not well marked; an annular post-stomach is followed by a short segment of intestine which forms the bottom of the digestive loop. The zooids have very long post-abdomens. Almost all colonies are immature. When present the testis vesicles have each a separate sperm duct joining the common duct at some distance, as previously noted in the description of the type specimen. No ovaries and no larvae have been found. Sequences were obtained for specimens A 1 APL.B 527 (BOLD: ASCAN 006- 10) and A 1 APL.B 525 (BOLD: ASCAN 005- 10) with 2.46 % divergence between the two. Investigation with additional specimens and markers of whether this represents an intraspecific divergence would be interesting. No close hit in BOLD (best: 81 %). The distribution of Aplidium balleniae is strictly Antarctic but wide: Balleny Islands, Ross sea, Antarctic Peninsula and now Terre Adélie, from 150 to 600 m depth. Aplidium falklandicum Millar, 1960 (Figure 5) Millar, 1960: 34 Fig. 3. Monniot & Gaill 1978: 142 Fig. 1 D. Monniot & Monniot 1983: 15 and synonymy. Tatian et al. 2005: 207. Sanamyan, Schories & Sanamyan 2010: 59 ... |
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