This species is subrecently transferred from L. tripteris by its cell shape and lenght (Chaber et al. 2022).
Phacus convexus (formerly Ph. rotunda or Ph. longicauda var. rotundus) is one of Phacus longicauda- morfotypes that can be easily distinguished by having spoon-like body with cauda mounted "on top".
A pretty Arcella from the Mer Bleue bog. The second images shows a close view of the "alveoli" that make up the structure of the shell. These are formed from granules of secreted material formed in the Golgi apparatus of the cell.
Echinoderm larvae
Planktonic, Advancetown Lake
DIC x400 magnification
Video: https://youtu.be/TcWVSTtinFU
Sampling location: A water sample was collected from Istok Lake near the shore, where snags and aquatic vegetation were present.
Date and time of collection: 16 Jul 2023 at 3 PM
Date and time of observation: 17 Jul 2023 at 8 PM
The sample was stored at room temperature in a plastic container.
I have 30 minutes of unedited footage stored. Should you be interested in viewing it, kindly inform me and I will endeavour to share the footage with you.
Magnification of first thirteen photos: 400×, 400×, 400×, 400×, 400×, 400×, 400×, 400×, 400×, 400×, 400×, 100×, 100×, 100×
Habitat: benthic, tangled mat, found in a drainage ditch.
Using stage micrometer for calibration, filaments estimated to range from 21 to 24 µm wide.
Planktonic, Cooloolabin Dam
DIC x400 magnification
Planktonic, Cooloolabin Dam
DIC x400 magnification
Planktonic, Cooloolabin Dam
Compare with Staurastrum ensiferum
DIC x400 magnification
Benthic/Metaphytic, Lake Freshwater, Cooloola Recreation Area, Great Sandy National Park
DIC x400 magnification
Planktonic, Cooloolabin Dam
DIC x400 magnification
Synura sphagnicola (Korshikov) Korshikov, 1929
In benthic creek sediment. Bright-field light microscopy.
Image 1: test
Image 2: pedal glands
Image 3: test texture
Magnification of all photos: 1000× (oil immersion)
Habitat: muddy water from the edge of a swamp. Associated plants: Cephalanthus occidentalis
Using stage micrometer for calibration, body (excluding feet) estimated to be about 140 µm long.
Using stage micrometer for calibration, estimated to be about 118 µm long and 23 µm wide.
In benthic creek sediment. Bright-field light microscopy.
Large plants. Perhaps hybrids of var. spatulata and var. gympiensis.
Video: https://youtu.be/9X78cstFh1c
Sampling location: The bark of a tree within the city limits.
Date and time of collection: 27 Aug 2023 at 10 AM
Date and time of observation: 27 Aug 2023 at 12 PM
The sample was stored at room temperature in a plastic container.
The sample was taken from the glass of a freshwater aquarium.
Magnification of all photos: 400×
Habitat: planktonic matter from a small pond. Associated plants: Ludwigia peploides
Using stage micrometer for calibration, vegetative cells estimated to be about 12.5-14.5 µm wide.
Benthic, Castaways Creek
DIC x400 magnification
Plantonic, endosymbiont on Rhizosolenia, Brisbane River
DIC x400 magnification
Planktonic, Blue Lake, Naree Budjong Djara National Park, North Stradbroke Island (Minjerribah)
Phase contrast x400 magnification
Type locality published in Rott, E., Kling, H. & McGregor, G. (2006). Studies on the diatom Urosolenia Round & Crawford (Rhizosoleniophycideae). Part 1. New and re-classified species from subtropical and tropical freshwaters. Diatom Research 21(1): 105-124
Magnification of all photos: 400×
Habitat: water and sediment from a shallow pool. Associated plants: Eleocharis sp.
Using stage micrometer for calibration, cell body estimated to be about 10.5 µm long and 4.5 µm wide.
Benthic, Condamine River at Chinchilla Weir
DIC x400 magnification (preserved specimen)
Metaphytic/benthic, Poona Lake, Cooloola Section, Great Sandy National Park.
DIC x400 magnification
Small sample taken of soil and moss from edge of dry rockpool on exposed sandstone hilltop and kept at room temperature for several weeks. Water added and kept at room temperature for several days. Samples taken by dropper over next few weeks and examined microscopically.
L~35 um
Planktonic, Lake Tinaroo
DIC x400 magnification
From sample taken August 7, 2024
From sample taken August 7, 2024
From sample taken August 7, 2024
Bright green balls that appear very dark under the microscope. There was an abundance of Nostoc pruniforme here, might these be young ones?
From sample taken August 10, 2024.
Planktonic, Waranga Basin.
DIC x400 magnification
DESCRIPTION: Filaments planktonic, generally straight, and surrounded by a broad hyaline mucilage up to 6.5 µm wide; facultatively produce T-type true branching. Branching is homothallic, progressing from a lateral bulge in vegetative cells perpendicular to the main filament, and through subsequent cell divisions, continue to elongate; vegetative cells of branches generally similar to, or only slightly broader than the parent filament, apical cells barrel shaped and hyaline. Vegetative cells with aerotopes, ± vacuolate, longer than broad (L:W 1.9–6.3) ranging from short cylindrical to elongated club-shaped; 7.7–21.1 µm long × 2.8–5.2 µm broad. Apical cells ± hyaline, elongated and club-shaped (L:W 2.6–6.5); 10.8–47.8 µm long × 2.6–7.3 µm broad. Heterocytes spherical to slightly longer than broad; 5.4–11.2 µm long × 4.4–7.5 µm broad. Akinetes solitary or up to two in series, and remote from heterocytes; ovate to elongated cylindrical (L:W 1.2–4.2); rounded at the ends; 13.1–33.8 µm long × 6.3–10.9 µm broad.
Metaphytic, Moon Point Fens, Great Sandy National Park, K'gari (Fraser Island)
DIC x400 magnification
Planktonic, Coolmunda Dam
DIC x400 magnification (preserved specimen)
Size: 191 µm x 72 µm.
Site of sample collection: A stream full of algae near the South Pond, Katsurashima Ryokuchi (a freshwater habitat), Sendai, Japan
Date of collection: August 27th, 2022
Weather: Cloudy
Water temp.: 25.4°C
pH 7.0
Date of observation: August 28th, 2022 (the collected sample in a plastic container was left near a window out of direct sunlight at room temperature until observation)
Bright-field observation using a Wraymer microscope (model BX-3500TL, Osaka, Japan) equipped with a Floyd-2 HDMI ethernet digital camera (Wraymer, Osaka, Japan). The accuracy of the scale bar was confirmed by using a stage micrometer glass slide (1 div. = 10 µm; Wraymer, Osaka, Japan) at each magnification.
Metaphytic, Lake Freshwater, Cooloola Recreation Area, Great Sandy National Park
DIC x400 magnification
Planktonic, Enoggerra Reservoir
DIC x400 magnification
Benthic/epiphytic, Brisbane River at Colleges Crossing
DIC x400 magnification
Benthic, Edgbaston springs
DIC x400 magnification
DESCRIPTION: Filaments densely arranged, radiating from the centre of spherical to discoid, blue-green to olive-green colonies, 5–25 mm in diameter. Filaments isopolar, uniseriate, cylindrical, straight or flexuous, 20–39 um in diameter, main filament generally wider than the lateral filaments which gradually taper to a bluntly conical end; with single or geminate false-branching. Sheath firm, lamellated, uncoloured to yellowish or yellow-brown, closed at the apex. Vegetative cells isodiametric to shorter than broad, slightly constricted at the cross walls, 3.3–8.2 um long 18.0–27 um wide in the main filament, 3.5–5.0 um long 4.2–12.0 um wide in lateral branches, with granular contents. Heterocytes basal and intercalary, solitary, spherical to compressed-ovoid, 6.3–9.5 um long 11.0–19.0 um wide. Akinetes absent.
Benthic, sub-aerophytic, Talaroo thermal springs
DIC x400 magnification
From a small stream coming out of a culvert by the roadside. Very sluggish, with a thick layer of algae on the surface among the reeds. I was surprised to see that essentially 100% of the phytoplankton were of one very active type. Cell diameter 11-16 microns. Globular, with a single pyrenoid and a red stigma. Four flagella. Carteria pseudoglobosa? Just guessing. I'm not even sure that it is Carteria.The stigmata are mostly hidden as it is strongly phototactic and turns toward the light source. And it is hard to make out the flagella in my microscope. Note that the gif of the plankton at low magnification is of raw water, unconcentrated.
Video (x4 speed): https://youtu.be/O98kzcA04nM
Photos are snapshots of the same individual featured in the video
Size: 130 µm in diameter
Site of sample collection: Pavilion, Katsurashima Ryokuchi North Pond (a freshwater habitat), Sendai, Japan
Date of sample collection: July 16th, 2022
Weather: Rainy
Water temp.: 21.3°C
pH 6.2
Date of observation: July 16th, 2022
Bright-field observation using a Wraymer microscope (model BX-3500TL, Osaka, Japan) equipped with a Floyd-2 HDMI ethernet digital camera (Wraymer, Osaka, Japan). The accuracy of the scale bar was confirmed by using a stage micrometer glass slide (1 div. = 10 µm; Wraymer, Osaka, Japan) at each magnification.
Video : https://youtu.be/NFUUxXxzs9Q
Size: The cell measures 25 µm x 20 µm.
Site of sample collection: Pavilion, Takamori Ryokuchi (a freshwater habitat), Sendai, Japan
Date of sample collection: July 2nd, 2022
Weather: Sunny
Water temp.: 27.1°C
pH 6.6
Date of observation: July 10th, 2022
Bright-field observation using a Wraymer microscope (model BX-3500TL, Osaka, Japan) equipped with a Floyd-2 HDMI ethernet digital camera (Wraymer, Osaka, Japan). The accuracy of the scale bar was confirmed by using a stage micrometer glass slide (1 div. = 10 µm; Wraymer, Osaka, Japan) at each magnification.
Video: https://youtu.be/aRbMKqI5ak0
Sampling location: A water sample was collected from Istok Lake near the shore, where snags and aquatic vegetation were present.
Date and time of collection: 16 Jul 2023 at 3 PM
Date and time of observation: 17 Jul 2023 at 10 PM
The sample was stored at room temperature in a plastic container.
All images and videos are of the same colony.
Conochilus hippocrepis (Schrank, 1803)
Diagnosis of the organisms observed:
• A planktonic rotifer that forms colonies encased in a gelatinous matrix or sheath.
• The colony is comprised of approximately 30 individuals, with an approximate diameter of 1 mm.
• The length of adult individuals within a colony has been observed to reach up to 470 µm.
• The species exhibits two distinct lateral (ventral) antennae. It can be confirmed that the majority of the specimens observed from the colony exhibited unequal antennae lengths, with the left ones being shorter.
• The stomach has an asymmetrical median ridge used for dividing food mass into two sections.
• The species is round-vase shaped, tapering off to a long un-segmented retractile foot without a toe; the corona is horseshoe shaped with a double band of cilia.
• Malleoramate trophi.
• The bladder opening is strongly shifted forward to the level of the mastax.
• Two red eye spots under the corona.
References:
Rotifer fauna of the USSR (Rotatoria). Subclass Eurotatoria (Orders Ploimida, Monimotrochida, Paedotrochida) (652, Fig. 1072) by L.A. Kutikova (1970)
http://www.rotifera.hausdernatur.at/Species/Index/394?AddScansGrid-page=9
https://www.nies.go.jp/chiiki1/protoz/morpho/rotifera/r-conoch.htm#Conochilus%20hippocrepis
Coexistence of Conochilus unicornis with C. hippocrepis in Lake Geneva : and commensal organisms found in their gelatinous matrix by Gérard Balvay and Jean-Claude Druart (1995)
https://doi.org/10.5169/seals-740260
In water sample from sphagnum fen
Extracted from Trichoglossus moluccanus moluccanus carcass (observation: https://www.inaturalist.org/observations/228149091) by freezing, washing with hot soapy water, and filtration, as described in Mironov and Galloway (2002) The Canadian Entomologist 134:605–618. Bright-field microscopy.
Image 1: body
Image 2: anterior; upper focal-plane
Image 3: anterior; central focal-plane
Image 4: posterior; upper focal-plane
Image 5: anterior; central focal-plane
Collected from pool in Sphagnum bog beside Fallison Lake, Wisconsin. 7/5/2024
Wet wallum