Synedrosphenia licmophoropsis Lobban, 2022
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publication ID |
https://dx.doi.org/10.3897/phytokeys.208.89913 |
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persistent identifier |
https://treatment.plazi.org/id/83F11755-EDF7-550E-BF74-C6A871F74A9C |
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treatment provided by |
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scientific name |
Synedrosphenia licmophoropsis Lobban |
| status |
sp. nov. |
Synedrosphenia licmophoropsis Lobban sp. nov.
Figs 9 View Figure 9 , 10 View Figure 10
Diagnosis.
Extremely long heteropolar cells, differing from other species in the cuneate shape in valve and girdle views.
Description.
Frustules heteropolar, tapering uniformly in both valve and girdle view (Figs 9D View Figure 9 , 10A, B View Figure 10 ), attached to seaweed substrata by mucilage stalks; plastids numerous, lenticular to oval (Fig. 9A, B View Figure 9 ). Valve margins parallel near basal pole, 14 µm wide, widening evenly to 27 µm wide just before the cuneate obtuse or slightly rostrate apical pole, length 600-735 µm (Fig. 9A-D View Figure 9 ). Striae parallel except radiate near apical pole, 19 in 10 µm near the apical pole, 16-17 near the basal pole (Fig. 9E-H View Figure 9 ). Annulus, evident even in living specimens (Fig. 9A View Figure 9 ), nearly halfway between centerline and valve margin (Fig. 9B-H View Figure 9 ), underlain by a longitudinal costa except at apical pole (Fig. 9G, H View Figure 9 ). Valve border with a rim along its length and shallow pseudosepta at each pole (Fig. 9G, H View Figure 9 ), the latter matched by extensive development of the valvocopula. In girdle view, three bands evident, all fimbriate (Fig. 10A-C, F View Figure 10 ). Valvocopula bearing a row of pores at the edge of the pars interior and five rows of pores on the exterior near the apical pole, reduced to two near the basal pole, the pores in a decussate pattern, 27 in 10 µm, the edge of the pars interior bearing short fimbriae near the apical pole, longer elsewhere (Fig. 10D-F View Figure 10 ). The pars interior of the valvocopula at the poles formed a deep shelf with an irregular surface (Fig. 10D, E View Figure 10 ), creating a notch on one side and a shallower, longer gap on the other (Fig. 10A, B View Figure 10 ); notches were on opposite sides of both the valvocopula itself and when comparing epitheca and hypotheca (Fig. 10A, B View Figure 10 arrows). The line of pores along the edge of pars exterior moved to inner edge of the gap and became slitlike (Fig. 10G View Figure 10 , arrow). Copula (Fig. 10A, B, F, H View Figure 10 ) wider, again with pores in a decussate pattern, about 10 rows near apical pole diminishing to five at the basal pole, a wide delicate fringe along the edge of the pars interior. The relationship between the first two girdle bands at the poles is shown in Fig. 10I View Figure 10 . The pleura (Fig. 10A-C View Figure 10 ) had a broad apical cap, quickly tapering to a narrow external line with fimbriate pars interior, broadening again somewhat at the basal pole; this band lacked pores.
Holotype
(designated here). Specimen at 13.0 mm E and 5.0 mm S of the mark on slide 455, deposited at ANSP accession # ANSP-GC20086. Fig. 9B-D View Figure 9 .
Registration.
Phycobank http://phycobank.org/103237.
Type locality.
“Pete’s Reef" (commercial dive site), Agat Bay, 13.347°N, 144.639°E. Epiphytic on Halimeda at 10 m, collection number GU55B-4, 13 Dec. 2008. C. Lobban and M. Schefter, leg.
Additional materials examined.
Guam: GU44Y-13!, GU44AV-8!, GU54A-B!, GU56A-2!, GU66B-6!, GU76B-2. Federated States of Micronesia: Yap: Y-37-8!; Marshall Islands: Bikar Atoll BA-5!.
Etymology.
Named for its resemblance to certain large Licmophora spp., especially L. attenuata Lobban, Tharngan and Ashworth.
Taxonomic comments.
Longer and more evenly tapered, apical pole broadly rounded, striae denser compared to S. gomphonema ; valves appearing narrower than S. gomphonema because of the greater length, but the apical poles are equally wide.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.