Guided submission

Same record, same database as the standard form — click through instead of using dropdowns. Experimental: the original form is still there if you prefer it.

Who's submitting?
Which species?
Where's this from?
Is a pyrenoid present?
Specify
Chloroplast shape
Click the closest match.
Discoid
Flattened, lens-shaped
Stellate
Star-shaped, radiating
Cup-shaped
Open, bowl-like
Two-lobed
Butterfly, shared pyrenoid
Lobed
Many small, irregular lobes
Cuboid
Flat, plate-like
Reticulate
Net-like, perforated
Elongate
Ribbon-like, e.g. Ectocarpus
?
Other
Ring/ribbon-shaped etc.
Specify
Where is the pyrenoid, relative to the chloroplast?
Central
Also called "embedded"
Stalked
Bulged
Junctional
Between chloroplast lobes
Transverse
Touches both sides, one axis
?
Other
Specify
Position (stalked / bulged)
Apical
Lateral
Matrix shape
Spherical
Lenticular
Elongated
Lobed
Multinucleate
Separate blobs
Amorphous
?
Other
Specify
Traversing membranes
Select all that apply — an invagination can also look fenestrated in section — or "Absent" if there's no membrane traversing the matrix.
Sheets
Fenestrated
Curved
Invaginated
Proximal
Peripheral
Rare — enters only near the matrix edge. Distinct from a surrounding membrane, which never enters the matrix.
Absent
Naked, no traversing membrane
?
Unclear
"Peripheral" still crosses into the matrix, just near the edge — a surrounding membrane (later step) stays outside the matrix entirely. Only choose Peripheral when you can clearly see it crossing in.
Extent
Complete
Spans the whole matrix
Partial
Enters from the edge, doesn't reach the other side
Discontinuous
Breaks partway rather than running continuously
?
Unclear
Carbohydrate barrier
Starch — also called capping vesicle / pyrenoid sac / pyrenoid cap in older TEMs.
Location
Chloroplastic
Extra-chloroplastic
Relative to the full 360° of the matrix — full coverage is essentially impossible for stalked/bulged pyrenoids.
Morphology
Plate
Granule
?
Other
Specify
Surrounding membrane
A distinct membrane closely surrounding the matrix — includes thylakoids running close/appressed to it.
Present
Click to select Yes
Absent
Click to select No
Select all that apply — e.g. thylakoid on one side, envelope on another.
Specify origin
Specify morphology
Shell
Thin protein layer — often hard to observe, and rare to confidently designate. Only designate if clearly visible. See Shimakawa et al. (2024) Cell.
Present
Click to select Yes
Absent
Click to select No
Plastoglobuli
Small, roughly spherical lipid droplets, sometimes visible in or around the pyrenoid.
Present
Click to select Yes
Absent
Click to select No
Nucleomorph
A vestigial nucleus from secondary endosymbiosis — present in some lineages (e.g. cryptophytes, chlorarachniophytes), never in others.
Present
Click to select Yes
Absent
Click to select No
Anything else?
Screenshot of the figure
Click the box, then paste (Ctrl+V/Cmd+V) — or browse a file. Max 5 MB. If the image won't paste because it's too large, try zooming out or lightly compressing it before pasting.
Click here, then paste an image
Review & submit
Click any row to go back and correct it.