- Home
- ...
- Diatoms
- Factsheets
Sellaphora styxii P.M.Novis, J.Braidwood & C.Kilroy
In this section
-
Factsheets
- Achnanthes crosbyana
- Actinella aotearoaia
- Caloneis clevei var. carteriana
- Cavernosa kapitiana
- Dimerogramma maculatum fo. mercuryensis
- Entomoneis wilkinsonia
- Eolimna krummensis
- Eunophora berggrenii
- Eunotia sudetica var. hamuranaensis
- Fallacia vittata var. rotoehuensis
- Fragilariforma cassieae
- Fragilariforma rakiuriensis
- Frankophila biggsii
- Frustulia aotearoa
- Frustulia cassieae
- Frustulia gondwana
- Frustulia maoriana
- Gyrosigma foxtonia
- Gyrosigma sterrenburgii
- Hamatusia reediana
- Navicula barberiana
- Navicula cassieana
- Navicula tairuaensis
- Pinnularia barberiana
- Pinnularia barberiana var. opouraensis
- Pinnularia chapmaniana
- Pinnularia opouraensis
- Pinnularia segariana
- Pinnularia woodiana
- Planothidium victori
- Pleurosigma amarum
- Sellaphora styxii
- Surirella rattrayi f. acuminata
- Tabularia variostriata
- Thalassiosira hasleae
Description
Frustules elliptical in valve view, 5.0-8.0 µm long, 2.5-2.9 µm wide, with rounded poles, biraphid. Live cells usually contain a single H-shaped plastid, but this sometimes fragments to give two parietal plastids appressed to each valve margin. Valve face planar and curved at the margins. Striae radiate, uniseriate or (more commonly towards the poles) biseriate, 22-25 in 10 µm. Central area "bow tie"-shaped, less obviously in smaller cells. Areolae round, variable in size and spacing, not aligned longitudinally. Transapical ribs not deflected; groove parallel to the raphe absent. Raphe central, with sinuous external fissures; central endings deflected towards primary side; apical endings hooked towards the secondary side. The apical raphe endings are curved in opposite directions on the hypovalve and epivalve. Transapical bars (as in S. pupula (Kütz.) Mereschk.) absent.
Notes
Funding from TFBIS (Terrestrial and Freshwater Biodiversity Information System), administered by the New Zealand Department of Conservation, is gratefully acknowledged.
Reference
Novis PM, Braidwood J, Kilroy C 2012. Small diatoms (Bacillariophyta) in cultures from the Styx River, New Zealand, including descriptions of three new species. Phytotaxa 64: 11–45.