Lepocinclis hispidula

(Eichwald) Daday, 1905

Most likely ID: n.a.

 

Synonyms: Phacus hispidulus, Phacus suecicus var. latus, Phacus horridus, Phacus hystrix, Phacus latus, Phacus glaber, Phacus papillaris, Lepocinclis horrida

 

Sampling location: Simmelried

 

Phylogenetic tree: Lepocinclus hispidula

 

Diagnosis: 

  • cells ovoid or obovoid
  • length 39–55 µm, width 20–25 µm
  • conical shaped apex
  • flagellum shorther than cell
  • numerous chloroplasts, disc-shaped
  • pellicle with longitudinal rows of fine spines
  • base of spines almost squared
Lepoconclis-hispidula
Lepoconclis hispidula

I’ve only been finding Lepocinclis hispidula in the Simmelried since 2019. Since then I find the species there regularly. Before that, I have no records and Lepocinclis hispidula is not present in my other sampling sites either.

 

The species was originally described as Phacus hispidulus (Lemmermann, 1910). In 2012, Phacus hispidulus was then transferred to the genus Lepocinclis by Bennet & Triemer on the basis of genetic analyses, together with some other Phacus species (e.g. Phacus horridus, s. „Synonyms“ above).

 

Lepocinclis hispidula is easily recognized by its longitudinal rows of short spines on the pellicle (s. fig. 1 a-c). These have an almost square and rectangular base (s. fig. 4). In addition, the species has a conically shaped apex from which the flagellum originates. Many disc-shaped chloroplasts can be seen in the cell (s. fig. 1 b). Two large paramylon grains are said to be present, but I was unable to detect them. The cell wall of my specimens was either colorless or slightly yellow-brown in color. In my population I also found specimens with only a few rows of rudimentary spines (s. fig. 2 a-c). It is possible that these are daughter cells after a division has taken place.

Lepoconclis-hispidula

Fig. 1 a-c: Lepocinclis hispidula. L = 40 µm. Different focal planes of a freely swimming specimen. Note the cone-shaped apex (CA) where the flagellum (F) emerge. Chl = disc-shaped chloroplasts. Obj. 100 X.

Lepocinclis-hispidula

Fig. 2 a-c: Lepocinclis hispidula. L = 38 µm. Different focal planes of a specimen with only few rows of rudimentary spines (arrows). CV = contractile vacuole, Nu = nucleus, RE = reservoir. Obj. 100 X.

Lepocinclis-hispidula

Fig. 3 a-c: Lepocinclis hispidula. L = 46 µm. A third, freely swimming specimen. Obj. 100 X.

Lepoconclis-hispidula

Fig. 4: Lepocinclis hispidula. L = 45 µm. A slightly squashed specimen with focal plane on the almost squared base of short spines. Obj. 100 X.