Cellaria Ellis & Solander 1786
Cellaria sp. 3 (Fig. 11) Cellaria sp. 3: Achilleos et al. 2019: [4–7]. Material examined. NIWA 132737, NIWA Stn U 582, 31.8617º S, 172.4333º E, Three Kings Ridge, 790 m, collected 5 February 1988. Description. Colony erect, comprising three stems not> 7 mm in length, very slender, 4-sided, taperi...
| Main Authors: | , , |
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| Format: | Other/Unknown Material |
| Language: | unknown |
| Published: |
2020
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| Subjects: | |
| Online Access: | https://zenodo.org/record/5586885 https://doi.org/10.5281/zenodo.5586885 |
| Summary: | Cellaria sp. 3 (Fig. 11) Cellaria sp. 3: Achilleos et al. 2019: [4–7]. Material examined. NIWA 132737, NIWA Stn U 582, 31.8617º S, 172.4333º E, Three Kings Ridge, 790 m, collected 5 February 1988. Description. Colony erect, comprising three stems not> 7 mm in length, very slender, 4-sided, tapering proximally (W, 147–399 μm). Zooids arranged back to back in alternating pairs, hence 4 longitudinal series. Autozooidal cystids highly elongate-hexagonal, sometimes with rounded distal margins and lateral walls of whorled zooid pairs abutting or not (ZL, 632–880 μm; ZW, 343–364 μm; ratio 2). Cryptocystal surface evenly granular except for area proximal to opesia where granules are sparse to absent; cryptocystal ridges unusually merging into lateral zooid margins distally, continuous and rounded proximally. Lowest part of frontal cryptocyst immediately proximal to opesia. Opesia wider than long (OpL, 109–117 μm; OpW, 142–158 μm; ratio 0.75), rim scarcely raised, smooth or weakly and irregularly beaded where granules occur, centre of proximal margin upturned as conspicuous proximal rectangular lip with opesiular indentations either side; no visible condyles. Avicularia and ovicells not seen. Presumed ancestrular zooid flanked by larger latero-abfrontal pair, all three tapering to narrow point with tiny rootlet pores. Up to 4 paired zooid whorls distal to ancestrula with paired foramina where opesiular indentations used to be; proximal to these foramina, whorls closest to ancestrula have partial overgrowth of calcification, creating large opening for rootlet. Closure of opesia initiated when median tongue of calcification grows from distal margin to the rectangular lip process. Remarks. Few species have such a prominent rectangular median process. Liu & Hu (1991) depict a fairly well-developed such process in Antarctic Cellaria complanata, but this species has flanking condyles and many more longitudinal zooidal series. What is striking about the rectangular lip process in Cellaria sp. 3 is how angular it is, even ... |
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