Bdelloid Rotifer Fauna of Germany and neighbouring countries: Habrotrocha bidens, Gosse 1851 (Habrotrochidae/ Bdelloidea/Rotifera, Syndermata, Gnathifera, Spiralia, Protostomia, Bilateria, Metazoa, Opisthokonta, Eukaryota)

Habrotrocha sp. 5 cf Habrotrocha bidens

Habrotrocha sp.5 cf bidens dorsal view, whirling.(1)

Habrotrocha sp.5 cf bidens; anterior part of 2 specimens from (1), dorsoventral vie., Left: optical median section, focal plane on the slightly notched upper lip which seems to have a separating membrane in the middle (both traits are different from the descriptions of GOSSE (1851) and DONNER (1956)). Corona width ≥ head width.

Right: optical median section, focal plane (more ventral) on a membrane in the sulcus (marked by 2 arrowheads) which is not mentioned for H. bidens by GOSSE (1851) and DONNER (1956). The two arrows mark the anterior margin of the upper lip.

Habrotrocha sp.5 cf bidens; creeping specimen, dorsoventral view.

Habrotrocha sp.5 cf bidens; foot with spurs and (extended) dorsal toe is in focus.

Habrotrocha sp.5 cf bidens; ramate trophi; left: (cephailc view), dental formula (DF): 2/2; right: caudal view; ramus length (RaL): 12µm.

DONNER (165) mentions that this species is: "sehr variabel", a statement that suggests that there maybe several species that are called "H. tripus"; So future descriptions have to be more precise.

	Location: Okaimeden, High Atlas; Morocco; lithothelma (click to enlarge)

	Habitat: fine sediment

	Date: coll.: 07/2024; img: 26.09.2024

	Sample courtesy of Jan Rosenboom, inspiring-nature.com.

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