A. vas f. reticollaris – Material from De Groot, Tierra del Fuego (private collection of Ferry Siemensma)

 
Apodera vas f. reticollaris Jung, 1942

Diagnosis: Test composed of two clearly distinct parts, a subspherical or ellipsoidal, compressed basal part and a neck. The two parts are separated by a deep constriction. Test brown to dark brown. Neck rather straight not swollen at the junction separating the main part of the test from the neck.

Dimensions: L=118-158 μm, B=75-97 μm

Remarks: Jung (1942) described new form of Apodera vas f. reticollaris, which differes from the type by the straighter neck and absence of bulb on the junction separating body from the neck. It is darker than type species, almost dark brown. Dimensions of the test are not differing very much from type: length 118-158um, breadth 75-97um, diameter of the aperture 28-38um. Whether this is just phenotypic plasticity or independent species need to be proven by molecular methods. Zapata and Fennandez (2008) already observed polymorphism within A. vas species. Based on morphology and morphometry they were able to separate at list 2-3 morphotypes within the species. The polymorphism of A. vas need to be proven by molecular methods (from Kosakyan).

Reference: Kosakyan, A., Gomaa, F., Lara, E. and Lahr, D.J.G. : Current and future perspectives on the systematics, taxonomy and nomenclature of testate amoebae – European Journal of Protistology, 2016

 
  

Recent posts

Difflugia key ovoid

Difflugia Group 1 Key characters: Test < 60 µm. Test in cross section rounded. Test with rounded fundus. Pseudostome with smooth circular edge. Test not

Read More »

Difflugia: ovoid tests

Difflugia – group 1 Test < 60 µm. Test in cross section rounded. Test with rounded fundus. Pseudostome with smooth circular edge. Test not spherical

Read More »

Difflugia ampla

Difflugia ampla, after Rampi, 1950 (l) and Gauthier-Lièvre et Thomas, 1958 (r) Difflugia ampla Rampi, 1950 Diagnosis: Test broadly pyriform, with a wide and rounded

Read More »

Difflugia parva

Difflugia parva, from Gauthier-Lièvre et Thomas, 1958 Difflugia parva  (Thomas, 1954) Ogden, 1983 = Difflugia oblonga var. parva Thomas, 1954 Diagnosis: Test pyriform, tapering evenly from

Read More »