Marine Apartectal (Chamberless) Mastogloiaceae (Diatomeae: Bacillariales): <i>Paramastogloia cubana</i> gen. nov., sp. nov., New Observations and Emended Diagnosis of <i>Mastoneis,</i> and Comparison with <i>Mastogloiopsis</i>
<i>Mastogloia</i> is a large, morphologically diverse genus of primarily benthic marine species defined by the presence of partecta (chambers) on the valvocopula (girdle band next to the valve). Several genera have been found with valves that resemble <i>Mastogloia</i> but la...
Saved in:
| Main Author: | |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-05-01
|
| Series: | Taxonomy |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2673-6500/5/2/24 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | <i>Mastogloia</i> is a large, morphologically diverse genus of primarily benthic marine species defined by the presence of partecta (chambers) on the valvocopula (girdle band next to the valve). Several genera have been found with valves that resemble <i>Mastogloia</i> but lack the ring of partecta; the most diverse group is in freshwaters, especially <i>Aneumastus</i>, but there are two marine genera, both monotypic. A third such species has been found in Cuba and is described here as <i>Paramastogloia cubana</i> gen. nov., sp. nov. <i>Paramastogloia cubana</i>, <i>Mastoneis biformis,</i> and <i>Mastogloiopsis biseriata</i> each resemble the valve structure of some species of <i>Mastogloia</i> but do not resemble one another. <i>Paramastogloia</i> is indistinguishable in light microscopy (LM) from naviculoid diatoms and had been identified as <i>Navicula</i> cf. <i>sovereigniae</i>. The resemblance of <i>P. cubana</i> to <i>Mastogloia</i> is in the areolae, particularly to those of <i>M. umbra</i>, <i>M. dicephala</i>, and <i>M. mammosa,</i> three species not likely to be in one monophyletic group. <i>Mastoneis</i> has been observed in LM from widespread warm-water localities and resembles some <i>Mastogloia</i> in having costae extending partway across the virgae (interstriae); new ultrastructural details are presented showing the girdle bands and absence of partecta, and a clearer genus diagnosis is proposed. The third genus, <i>Mastogloiopsis</i>, was established with ultrastructure and resembles species of <i>Mastogloia</i> sec. <i>Marginulatae.</i> The range of areolar characters that might be admissible to <i>Paramastogloia</i> is unknown, so the generic diagnosis has been left imprecise to allow for the possibility of other species. The relationships among these genera await genetic studies, which are still scarce in Mastogloiaceae. |
|---|---|
| ISSN: | 2673-6500 |