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Lobban, C. S.; Ashworth, M. P.; Calaor, J. J.; Theriot, E. C. (2019). Extreme diversity in fine-grained morphology reveals fourteen new species of conopeate Nitzschia (Bacillariophyta: Bacillariales). Phytotaxa. 401(4): 199.
346745
10.11646/phytotaxa.401.4.1 [view]
Lobban, C. S.; Ashworth, M. P.; Calaor, J. J.; Theriot, E. C.
2019
Extreme diversity in fine-grained morphology reveals fourteen new species of conopeate Nitzschia (Bacillariophyta: Bacillariales)
Phytotaxa
401(4): 199
Publication
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study was made of the ultrastructural variation in a group of conopeate Nitzschia species, primarily marine species from Guam but also including one freshwater species from Costa Rica. Fourteen new species are described: Nitzschia alcyoneae, Nitzschia asteropeae, Nitzschia carahii, Nitzschia celaenoae, Nitzschia dagmannii, Nitzschia electrae, Nitzschia guamensis, Nitzschia jordanii, Nitzschia lascrucensis, Nitzschia maiae, Nitzschia meropeae, Nitzschia schefterae, Nitzschia spathulatoides, and Nitzschia taygeteae. The valves in all these taxa had a central raphe-sternum on a raised keel; from the keel arise silica flaps, the conopea, and the valve face was depressed below the conopea to form conopeal canals. The valve surface was thus differentiated into three regions, in which the areola pattern sometimes differed: the exposed valve face, the valve depression, and the peri-raphe zone, i.e., the exposed part of the keel wall between the conopeum and the raphe-sternum. We refer to this suite of characters as the tholophora (canopy-bearing) morphology. In one species, N. maiae sp. nov., the conopea occurred only at the apex and there was no valve depression. Thirty-eight morphological characters were used in addition to the usual morphometric data (length, width, densities of striae and fibulae); these included, inter alia, a remarkable range of areola shapes on the three valve regions and the copulae—oval/circular pores, transapical slits, longitudinal slits, small pores fields, continuous pores fields, and larger quadrate pores closed by hymenes or cribra; the extent of the conopea along the valve; the presence of longitudinal ribs on the valve, conopea, or copulae; and the extent of internal development of silica below the striae. Phylogenetic analysis of gene sequences from six species was entirely congruent with analysis of morphological characters.
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2019-04-22 01:59:40Z
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Holotype GUAM Fig. 100, from specimen on stub 230, identified as Nitzschia dagmannii Lobban, Ashworth, Calaor & E.C.Ther. in Lobban et al., 2019
Holotype GUAM Fig. 141 from stub 230 (Diatom Herbarium catalog # 700230), identified as Nitzschia schefterae Lobban, Ashworth, Calaor & E.C.Ther. in Lobban et al., 2019
Holotype Fig. 52, from specimen on stub 221, identified as Nitzschia jordanii Lobban, Ashworth, Calaor & E.C.Ther. in Lobban et al., 2019
Holotype Figs 107, 108 of specimen on stub 230, identified as Nitzschia guamensis Lobban, Ashworth, Calaor & E.C.Ther. in Lobban et al., 2019
Holotype GUAM Figs 145, 146 of specimen on stub 568 (Diatom Herbarium catalog # 700568), identified as Nitzschia celaenoae Lobban, Ashworth, Calaor & E.C.Ther. in Lobban et al., 2019
Holotype GUAM Figs 69–71, from a specimen on stub 568 (Diatom Herbarium catalog # 700568), identified as Nitzschia meropeae Lobban, Ashworth, Calaor & E.C.Ther. in Lobban et al., 2019
Holotype GUAM Figs 75–77, from specimen on stub 230, identified as Nitzschia alcyoneae Lobban, Ashworth, Calaor & E.C.Ther. in Lobban et al., 2019
Holotype GUAM Figs 95, 96, from specimen on stub 230,, identified as Nitzschia carahii Lobban, Ashworth, Calaor & E.C.Ther. in Lobban et al., 2019
Holotype GUAM GUD004303! Figs 83–85, from specimen on stub 221, identified as Nitzschia taygeteae Lobban, Ashworth, Calaor & E.C.Ther. in Lobban et al., 2019
Holotype ANSP slide 1981 (Fig. 27), deposited at ANSP, accession # 20076., identified as Nitzschia maiae Lobban, Ashworth, Calaor & E.C.Ther. in Lobban et al., 2019
Holotype ANSP Slide from culture, accession # 20075, identified as Nitzschia asteropeae Lobban, Ashworth, Calaor & E.C.Ther. in Lobban et al., 2019
Holotype ANSP specimen on slide 1872 located at 13.0 mm E and 8.1 mm S of the reference mark, accession # 30927, identified as Nitzschia lascrucensis Lobban & C.E.Wetzel in Lobban et al., 2019
Holotype ANSP specimen on slide 1929 at 11.7 mm S, 9.6 mm E of the mark, accession # 20079, identified as Nitzschia spathulatoides Lobban, Ashworth, Calaor & E.C.Ther. in Lobban et al., 2019
Holotype ANSP specimen on slide 472 located at 9.0 mm E and 7.1 mm S of the reference mark, accession # 20077. Figs 130, 131., identified as Nitzschia electrae Lobban, Ashworth, Calaor & E.C.Ther. in Lobban et al., 2019
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