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Reared from Metrosideros polymorpha.

Found on 8/17, finishing a leaf mine. The egg was laid on the upper surface of the leaf near the midrib, it’s the little white dot pointed out by the black arrow in the last photo. On 8/18, the larva stopped feeding and began cutting out an oval section of the upper epidermis of the leaf, and by 8/19 there was a cocoon spun on the outer surface of that oval piece of leaf tissue in the typical “taco” cocoon. The leaf chad was still partially attached to the leaf after the larva had spun its cocoon. The adult eclosed on 8/30.

Phacus longicauda from the edge benthos of the acidic freshwater pond Chatfield's Hole situated in a white pine forest. This is the type species (holotype) of the genus Phacus. Length 175 um including the tail.
Species: 120-170 μm long, 45-70 μm wide; usually slightly twisted; a long caudal prolongation; flagellum about 1/2 body length; stigma prominent; a discoidal paramylon (paramylum) body central; pellicle longitudinally striated (Kudo, 1966).
var. longicauda: cell body 85-170 μm long, 45-70 μm wide; locomotive flagellum shorter than the cell body; a single paramylon body ring shaped (An Illustrated Guide to Freshwater Zooplankton in Japan, 2000).

Phacus longicauda (Ehrenberg) Dujardin 1841: 337, pl. 5 fig. 6
Published in: Dujardin, F. (1841). Histoire naturelle des Zoophytes, Infusoires, comprenant la physiologie et la clasification de ces animaux et la manière de les étudier à l'aide du microscope. pp. i-xii, 1-684. Paris: Librarie Encyclopédique de Roret

in the absence of a trunk or stone to lean on, a capybara may be an option;
I have observed these two individuals do this twice;

see also
https://www.inaturalist.org/journal/nelson_wisnik/21258-the-friendly-capybara