Diatoms of North AmericaPENDING:
* recognition of Thalassiosira weissflogii as Spicaticribra weissflogii
Thalassiosira weissflogii has been without a great home for some time. Stachura-Suchoples and Williams placed it in the invalid genus Conticribra in 2009 where many have recognized it (the genus Conticribra is unquestionably invalid as Stachura-Suchoples transferred T. weissflogii to Conticribra in the original publication when T. weissflogii was already a generitype for Micropodiscus and Cymatotheca). Khursevich and Kociolek proposed the transfer of T. weissflogii to Spicaticribra as S. weissflogii in 2013. There may be further problems because Thalassiosira weissflogii appears to also be the generitype of two other genera: Micropodiscus, Cymatotheca, and it is equally possible it could be argued that the Spicaticribra/weissflogii need to be recognized in as one of those genera. I am going to reach out to Bart to take a look at the Micropodiscus issue and the likelihood that we need to propose a reorganization of this mess.
Changes on DONA
a) change Thalassiosira weissflogii to Spicaticribra weissflogii
b) update genus description of Spicaticribra
to reflect recent redefinition (Khursevich et Kociolek 2012)
c) update genus description for Thalassiosira? remove any mention of continuous cribral plates
d) Change biodata names, T. gessneri, T. pseudonana, T. guillardii, now all recognized as Spicaticribra species
- Melosira dickiei to Angusticopula dickiei (Thwaites) Houk, Klee & H.Tanaka
Houk et al. (2017) apparently erected the genus Angusticopula to accommodate Melosira dickiei. I have not seen the reference…
Houk, V., Klee, R. & Tanaka, H. (2017). Atlas of freshwater centric diatoms with a brief key and descriptions. Second emended edition of Part I and II. Melosiraceae, Liparogyraceae, Paraliaceae and Aulacoseiraceae. Fottea 17(Supplement): 1-616.
Changes on DONA
a) Change Melosira dickiei to Angusticopula dickiei Thwaites) Houk, Klee & H.Tanaka
b) need genus page for Angusticopula
- Decussiphycus
The genus Decussata is not valid because the diatom genus name was not validly published (Art. 20.2, Ex. 4) as it was coined from a Latin technical term, namely decussatus, -a, um (adj. A). The name Decussata was replaced with the validly published genus Decussiphycus Guiry & Gandhi (2019) and typified by Decussiphycus placenta (Ehrenberg) Guiry & Gandhi.
Guiry, M.D & Gandhi, K. 2019. Decussiphycus gen. nov.: a validation of “Decussata” (R.M.Patrick) Lange-Bertalot (Mastogloiaceae, Bacillariophyta). Notulae Algarum 94: 1-2.
http://www.notulaealgarum.com/...
Changes on DONA
a) change Decussata placenta to Decussiphycus placenta (Ehrenberg) Guiry & Gandhi
b) change genus page for Decussata
to Decussiphycus Guiry & Gandhi
- update page for Mastogloia grevillei to Mastogloia danseyi f. grevillei
In a recent publication, Edlund and Burge (2019) solved Stoermer’s 50 yr old mystery on “Polymorphism in Mastogloia”. They used new samples and resurrected studies by Czarnecki and students to show temporal, geographic, genetic, and physiological lines of evidence that M. danseyi and M. grevillei are the same taxon, which exhibit two very different morphologies when cultured under different levels of solutes. Mastogloia danseyi is the older name so it has priority and is the type, with Mastogloia danseyi f. grevillei being recognized as an ecophenotype or form of the nominate.
Edlund, M.B. and Burge, D.R.L. 2019. Polymorphism in Mastogloia (Bacillariophyceae) revisited. Plant Ecology and Evolution 152(2): 351-357. https://doi.org/10.5091/plecevo.2019.1598
- new page for Mastogloia danseyi
Edlund and Burge are putting together a page for this based on material examined in:
Edlund, M.B. and Burge, D.R.L. 2019. Polymorphism in Mastogloia (Bacillariophyceae) revisited. Plant Ecology and Evolution 152(2): 351-357. https://doi.org/10.5091/plecevo.2019.1598
- Grunowia Describe the issues but not act
Confirm that all has been completed for the transfer & updates.
The genus Grunowia has come back into favor and is recognized on DONA with one species, G. solgensis. Two other species have been previously included in Grunowia—both are already found in DONA as Nitzschia taxa–N. sinuata, N. sinuata v. tabellaria. The genus Grunowia is characterized by eccentric raphe placement, large fibulae that do not extend across the whole valve face, and punctate uniseriate striae. There continues to be confusion/controversy on recognition of Grunowia and placement of taxa in it. Some suggest it should be recognized (Aboal et al. 2003) as originally suggested by Rabenhorst 1864, others have suggested that if Denticula tenuis (the lectotype of Denticula; Mann 1907) is to be included in Grunowia, then the taxa included in Grunowia should be recognized in Denticula (Liu et al. 2017).
Kociolek et al. 2025. Phylogenetic relationships of Denticula and Grunowia species (Bacillariophyta; Bacillariaceae)
https://www.tandfonline.com/doi/full/10.1080/00318884.2025.2554403
Aboal et al. 2003. Floristic list of non marine diatoms (Bacillariophyta) from Iberian Peninsula, Balearic Islands and Canary Islands. Diatom Monographs 4
Mann, A. 1907. Report on the Diatoms of the Albatross Voyages in the Pacific Ocean, 1888-1904. Contributions from the United States National Herbarium, Vol: 10, Issue: 5, 221-419, 11 pls
Liu, Q., Wu, W., Wang, J., Feng, J., Lv, J., Kociolek, J.P. and Xie, S., 2017. Valve ultrastructure of Nitzschia shanxiensis nom. nov., stat. nov. and N. tabellaria (Bacillariales, Bacillariophyceae), with comments on their systematic position. Phytotaxa, 312(2), pp.228-236
Rabenhorst, L. 1864. Flora Europaea Algarum aquae dulcis et submarinae. Sectio I. Algas diatomaceas complectens, cum figuris generum omnium xylographice impressis. Apud Eduardum Kummerum, Lipsiae. 359 pp
c) the generitype of Grunowia seems to have not been designated yet? But see additional notes.
- Gomphonella – needs some investigation by someone
Adopt transfer of v. densistriatum to Gomphonella (Notulae Algarum?).
- Lindavia/Pantocsekiella
Messy, discussions with Teo suggest that the Pantocsekiella is another way to cut up the tree based on Acs et al. evidence…
Pantocsekiella K.T.Kiss & Ács
Key Features:
Valve face divided into a polygonal central area and marginal striae zone.
Central area with papillae and punctate ornamentation.
Central ornamentations do not penetrate the frustule.
Striae are alveolate, terminating irregularly on the valve face.
Rimoportulae one, sometimes up to four, located marginally on the valve face among the striae.
Pantocsekiella was erected by Ács et al. (2016) to accommodate many of the smaller freshwater taxa traditionally placed in Cyclotella and more recently Lindavia (Nakov et al. 2015). Pantocsekiella is characterized by having a valve face divided into two zones, a polygonal central area and the marginal alveolate striae zone. The central area can be flat or undulate, ornamented with papillae and one to many fultoportulae. One (sometimes up to 4) rimoportulae occur marginally on the valve face, either at the end of a shortened striae or on a costae. However the key morphological distinctions from Lindavia are that in Pantocsekiella central area ornamentation is limited to fultoportulae that penetrate the frustule, there are no central area areolae, and the central area is often polygonal in shape (Acs et al. 2016).
Optional: Currently diatoms.org follows the taxonomy and genus-level phylogeny of Nakov et al. (2015) regarding diatoms historically placed in Cyclotella, however we recognize the work of Alexson et al. (2018) and Leuthje and Snyder (2021) accept the genus concept of Pantocsekiella and described novel taxa within Pantocsekiella. We continue to review and consider the work of Ács et al. (2016) and others and the placement of Cyclotella sensu lato taxa within Pantocsekiella and Lindavia.
References:
Ács, É., Ari, E., Duleba, M., Dressler, M., Genkal, S.I. and Kiss, K.T. (2016). Pantocsekiella, a new centric diatom genus based on morphological and genetic studies. Fottea, 16(1), pp. 56-78.
Alexson, E. E., Wellard Kelly, H. A., Estepp, L. R., & Reavie, E. D. (2018). Morphological variation around the Pantocsekiella comensis complex in the Laurentian Great Lakes. Diatom Research, 33(3), 321-337.
Luethje, M., & Snyder, J. (2021). Climate-related morphological changes in Pantocsekiella (Mediophyceae) spanning 0-1.2 Ma in the Lake El’gygytgyn, northeastern Russia including Pantocsekiella elgygytgynensis sp. nov. Phytotaxa, 478(1), 67-91.
Nakov, T., Guillory, W., Julius, M., Theriot, E., and Alverson, A. (2015). Towards a phylogenetic classification of species belonging to the diatom genus Cyclotella (Bacillariophyceae): Transfer of species formerly placed in Puncticulata, Handmannia, Pliocaenicus and Cyclotella to the genus Lindavia. Phytotaxa, 217(3), 249-264.
Schultz, K., Dreßler, M., and Jacques, O. (2022). Transfer of Cyclotella michiganiana Skvortzov to the genus Pantocsekiella K.T.Kiss & Ács (Stephanodiscaceae, Bacillariophyta). Notulae Algarum 250, 1-3.
- Paraplaconeis—straightforward
Placoneis placentula and P. subplacentula have been transferred to Paraplaconeis, neither of these taxa are yet on DONA, P. placentula (and several forms/vars) have been reported in USA (Kociolek 2005, Bahls 2009).
Changes on DONA
Need a genus page, a page for P. placentula
- Navicymbula vs Seminavis - straightforward
Cox and Reid 2004 transferred Grunow’s Cymbella pusilla to the newish genus Seminavis. Krammer erected Navicymbula in 2003 and included Grunow’s Cymbella pusilla as the generitype. DONA recognized Navicymbula whereas Rioual et al. 2014 clearly says it belongs in Seminavis.
DONA: Need to critically look at Seminavis vs Navicymbula and decide where this taxon belongs, if in Seminavis, we need to transfer to Seminavis, probably retire the Navicymbula page.
Cox, E. J. and Reid, G. 2004. Generic relationships within the Naviculineae: a preliminary cladistic analysis. In Poulin, M. (Ed.) Proceedings of the Seventeeth International Diatom Symposium. Biopress Limited, Bristol, pp. 49–62
Krammer, K. 2003. Cymbopleura, Delicata, Navicymbula, Gomphocymbellopsis, Afrocymbella. In Lange-Bertalot, H. (Ed.) Diatoms of Europe, Vol. 4. ARG Gantner Verlag K.G., Ruggell, pp. 1–530
Potapova, M. 2011. Navicymbula pusilla. Diatoms of the United States. [cited 28 April 2014]. Available from: http://westerndiatoms.colorado... navicymbula_pusilla
Round, F. E., Crawford, R. M. and Mann, D. G. 1990. The Diatoms. Biology & Morphology of the Genera. Cambridge University Press, Cambridge
Rioual, P., Lu, Y., Chu, G., Zhu, B. and Yang, X., 2014. Morphometric variation of Seminavis pusilla (B acillariophyceae) and its relationship to salinity in inter‐dune lakes of the B adain J aran D esert, Inner M ongolia, China. Phycological research, 62(4), pp.282-293
- Ellerbeckia R.M.Crawford, 1988, typification
Holotype species: Melosira arenaria D.Moore ex Ralfs
Currently accepted name for the type species: Ellerbeckia arenaria (D.Moore ex Ralfs) Dorofeyuk & Kulikovskiy
Original publication and holotype designation: Crawford, R.M. (1988). A reconsideration of Melosira arenaria and M. teres resulting in a proposed new genus Ellerbeckia. In: Algae and the Aquatic Environment. (Round, F.E. Eds), pp. 413-433. Bristol: Biopress.
Ellerbeckia arenaria (D.Moore ex Ralfs) Dorofeyuk & Kulikovskiy 2012
(NOTE: Crawford’s transfers not valid?) See Fottea Suppl new Houk et al. 2017for some detail
Ellerbeckia arenaria (D.Moore ex Ralfs) Dorofeyuk & Kulikovskiy
Ellerbeckia arenaria (D.Moore ex Ralfs) Dorofeyuk & Kulikovskiy Bainbridge Island, Washington, USA; pond, 400x, DIC - 13 March 2008. Karl Bruun ([email protected])
Publication Details
Ellerbeckia arenaria (D.Moore ex Ralfs) Dorofeyuk & Kulikovskiy 2012: 29
Published in: Dorofeyuk, N. & Kulikovskiy, M. (2012). Diatoms of Mongolia. Biological resources and natual condiitons of Mongolia. Proceedings of Joint Russian-Mongolian Complex Biological Expedition. Vol. LIX. pp. [1]-367, incl. 4 pls. Moscow: Institute of Ecology and Evolition RAN
- Crenotia
DONA has genus page – do we need to make any transfers of species?
https://www.tandfonline.com/doi/abs/10.1080/0269249X.2020.1810781
Wojtal, A.Z. (2013). Species composition and distribution of diatom assemblages in spring waters from various geological formations in Southern Poland. Bibliotheca Diatomologica 59: [1]-436, 4 text-fig., 5 tables, 170 pls.
- Lineapertua
new genus needed - transfer of Thalassiosira lacustris
- Gomphadelpha
Abarca, N., Stancheva, R., Skibbe, O., Schimani, K., Kusber, W.H., Zimmermann, J. and Jahn, R., 2023. Gomphadelpha (Bacillariophyceae)–a new genus name for taxa formerly subsumed in the Gomphoneis herculeana-group. Nova Hedwigia, pp.213-254
new genus needed transfer all Gomphoneis taxa with spp page on DONA to Gomphadelpha
BioData list , leave stoermeri, pacificum, gracile in Gomphoneis This genus seems to be well supported by evidence.
- Witkowskia (separated from Placoneis, most Placoneis species treated here)
Mironov, A., Glushchenko, A., Maltsev, Y., Genkal, S., Kuznetsova, I., Kociolek, J.P., Liu, Y. & Kulikovskiy M. (2024). Reassessment of pore occlusion in some diatom taxa with re-evaluation of PlaconeisMereschkowsky (Bacillariophyceae: Cymbellales) and description of two new genera. PeerJ 12(e17278): 1–62, 10 figures, 4 tables.
- Orthoseira/LIparogyra/Aerophilia
Liparogyra Ehrenberg 1848, L. dendroteres Ehr. 1848, L. hawaiiensis (Danz & Kociolek) Danz & Kociolek 2024, L. mauiana (Danz & Kociolek) Danz & Kociolek 2024, L. loweana (Danz & Kociolek) Danz & Kociolek,
Stephanosira Ehrenberg, S. epidendron Ehr. 1848
Aerophilia Danz, Van de Vijver & Kociolek 2024, A. oregoniana (Danz & Kociolek) Danz, Van de Vijver & Kociolek 2024, A. roeseana (Rabenhorst) Danz, Van de Vijver & Kociolek 2024,
Danz, A., Kociolek, J.P., Van de Vijver, B., Kusber, W.-H., Guerrero, J.M., Vouilloud, A.A. & Sala, S.E. (2024). A morphology-based phylogeny of the diatoms formerly assigned to the Orthoseiraceae (Bacillariophyta): phylogenetic relationships, character analysis and classification. European Journal of Phycology 59(3): 290–310.
- Stephanocyclus - Kuliovsky
_______________________________
COMPLETED:
DONA EDITORIAL ACTION: Playaensis citrus nomenclatural transfer recognized
Playaensis citrus (Krasske) E.Reichardt 2018: 207, pl. 106: figs 25-27; pl. 109: figs 18-23
Reichardt, E. (2018). Die Diatomeen im Gebiet der Stadt
Treuchtlingen. pp. [1]-576 (Band 1); 579-1184 (Band 2), incl 451 pls.
München: Bayerische Botanische Gesellschaft [Selbstverlag der
Gesellschaft].
DONA EDITORIAL ACTION: Note added to Achnanthidium exiguum:
Note that Kulikovskiy and Witkowski (2011) proposed the transfer of this taxon to the genus Lemnicola. The editors of this website propose that the transfer based on morphological features is not conclusive for this taxon. For example, some morphological characters would imply placement of A. exiguum in Psammothidium rather than in Lemnicola. Furthermore, Lemnicola has biseriate striae, while the striae of A. exiguum striae are uniseriate. Consequently, molecular data is necessary to place this taxon in the genus that conforms to its evolutionary lineage.
DONA EDITORIAL ACTION: Iconella/Surirella/Campylodiscus/Rhopalodia recognition and transfers are complete following Ruck et al. 2016.
DONA EDITORIAL ACTION:
Lemnicola exigua to replace Achnanthidium exiguum
Bart mentioned this change at NADS’19. Achnanthidium exiguum was transferred to the genus Lemnicola in 2011. I have not seen the original publication where the transfer was proposed. The new name Lemnicola exigua is being used in the literature.
Changes on DONA
a) change Achnanthidium exiguum to Lemnicola exigua
b) add Achnanthidium exiguum as homotypic synonym, Achnanthes exigua
v. constricta as heterotypic synonym?
c) need to see this Plinski, M. & Witkowski, A. (2011) publication to see if they did any emending of the genus Lemnicola
to accommodate A. exiguum.
Lemnicola exigua (Grunow) Kulikovskiy, Witkowski & Plinski in Plinski & Witkowski 2011: 112, fig. 113
Plinski, M. & Witkowski, A. (2011). Okrzemki – Bacillariophyta (Diatoms) (with the English key for the identification to the genus) Cz. 4/2: Okrzemki pierzaste (Fragilariophyceae, Eunotiophyceae, Achnanthales) Part two: Pennate diatoms - I). In: Flora Zatoki Gdanskiej i wód przyleglych (Baltyk poludniowy). : [1]-167, plus 4 pls, 4 photo
DONA EDITORIAL ACTION: Delicatophycus
The genus Delicata Krammer 2003 is not valid because the diatom genus name was not validly published (Art. 20.2, Ex. 4) as it was coined from a Latin technical term, namely delicatus, -a, um (adj. A). The name Delicata was replaced with the validly published genus Delicatophycus M.J.Wynne (2019) and typified by Delicatophycus delicatulus (Kützing) M.J.Wynne
Wynne, M.J. 2019. Delicatophycus gen. nov.: a validation of “Delicata Krammer” inval. (Gomphonemataceae, Bacillariophyta). Notulae Algarum 97: 1-3.
http://www.notulaealgarum.com/...
Changes on DONA
a) change genus page for Delicata to Delicatophycus
b) change all four species of Delicata
on DONA to Delicatophycus taxa
Delicatophycus alpestris M.J.Wynne sp. nov. Replaced designations: “
Delicatophycus delicatulus (Kützing) M.J.Wynne
Delicatophycus canadensis M.J.Wynne
Delicatophycus montana M.J.Wynne
Biodata Delicata verena, Delicatophycus verena M.J.Wynne
DONA EDITORIAL ACTION: Pulchellaphycus
The genus Pulchella Krammer 2003 is not valid because the diatom genus name was not validly published (Art. 20.2, Ex. 4) as it was coined from a Latin technical term, namely pulchellus, -a, um (adj. A). The name Pulchella was replaced with the validly published genus Pulchellophycus Edlund & M.J.Wynne (2019) and typified by Pulchellophycus kriegerianus (Krasske) Edlund & M.J.Wynne
Edlund, M.B. and Wynne, M.J. 2019. Pulchellophycus gen. nov.: a validation of “Pulchella” Krammer (Naviculaceae, Bacillariophyta). Notulae Algarum 100: 1-4. http://www.notulaealgarum.com/documents/Notulae%20algarum%20No.%20100.pdf
Changes on DONA
a) need genus page for Pulchellophycus
b) add species page for P. porcatus
Edlund & M.J.Wynne (reported in Kociolek et al. Bibliotheca Diatomologica 61: 35-36, pl. 44: figs. 14-19; pl. 45: figs 1-3. 2014)
c) add species page for P. kriegerianus
(need to find material, it is in USA, STOERMER, E.F., KREIS, R.G., JR. AND ANDRESEN, N.A. 1999. Checklist of diatoms from the Laurentian Great Lakes. II. Journal of Great Lakes Research 25:515–566)
d) add species page for Pulchellophycus schwabei (Krasske) Edlund & M.J.Wynne (material?, it is in USA - ID, MT) Bahls, L.L., 2009. A checklist of diatoms from inland waters of the northwestern United States. Proceedings of the Academy of Natural Sciences of Philadelphia, 158(1), pp.1-36. I CHECKED WITH LOREN AND HE ONLY HAD TWO SPECIMENS IN HIS COUNTS, I’LL LOOK TO SEE IF I CAN FIND IT IN LAC LA CROIX.
DONA EDITORIAL ACTION: Cymbellafalsa (Navicula diluviana)
Changes on DONA
Need a genus page, a page for N. diluviana. We have this in several samples so could tackle it.
Shell Lake, SLBE 20-21 cm 0.5%, 33-34 cm >1%, Bass Lk SLBE 8-10 cm, Little Beaver PIRO Surf seds 0-1 cm 2005,
DONA EDITORIAL ACTION: Mastogloia taralunae Bahls
See images from Nakov file on M. doddii/stoermeri
From Bahls 2017
Valves are linear with rostrate apices in the largest specimens, elliptic with cuneate apices in smaller specimens. Valve length 27-49 μm; valve width 9.0-12.2 μm. The axial area is very narrow. The central area is large and circular or transversely rectangular. The raphe is filiform and straight. Proximal raphe ends are also straight and slightly inflated. Distal raphe fissures are indistinct. Partecta are all of the same size and number 7 in 10 μm. Striae are weakly radiate, 14 in 10 μm. Areolae number about 20 in 10 μm. [n=30]
Holotype: USA, Montana: Blackfeet Indian Reservation, Glacier County, Connelly Fen, 48.6208°N, -112.7775°W, coll. Peter Lesica, 9 September 2013, MDC sample 514201, MDC slide 45-45 (holotype is Fig. 233) MONTU! MDC slide 130-39.
Ecology & Distribution: Specific conductance at the type locality was 1600 μS/cm and pH was 7.42.
Etymology: This species is named after Tara Luna, a Montana botanist who lives and works on the Blackfeet Reservation where the type material was collected.
