Key to Euglypha species

 

1

Fundus with a tuft of spines (Fig. 1)

2

-

Fundus without spines or when present spines not in a tuft

4

2

Fundus with 1-2 spines, shell 100-140 µm (Fig. 1e)

E. mucronata

-

Fundus with a tuft of 1-8 spines, shell < 80 µm

3

3

Shell with somewhat concave sides (Fig. 1a-c)

E. cristata

-

Shell ovoid, slightly compressed (Fig. 1d)

E. bryophila

 

 

Fig. 1: a-c E. cristata b var. major d E. bryophila e E. mucronata

 

4

Shell usually with spines

5

-

Shell without spines

10
5

Spines are elongated tapering body scales

6

-

Spines are not part of body scales

9
6

Spines much longer than the scales

7

-

Spines about as long as the scales

9
7

Shell more or less broad ovoid, almost spherical

E. cabrolae

-

Shell elongated ovoid

8
8

Shell with few long spines near the aperture (Fig. 2a)

E. brachiata

-

Shell with some long spines near the fundus (Fig. 2c)

E. acanthophora

9

 

Mid-body region with some randomly distributed pointed body plates.

E. dickensii

-

Fundus region with sharply pointed body plates E. penardi

 

Fig. 2: a E. brachiata b E. scutigera c E. acanthophora d-e E. tuberculata

 

10

Shell ovoid, in cross-section circular

11

-

Shell ovoid or pyriform, in cross-section more or less compressed

13

11

Shell small, < 30 µm

E. laevis

-

Shell > 50 µm

12

12

Scales oval (Fig. 2e)

E. tuberculata

-

Scales pointed, scutiform (Fig. 2b)

E. scutigera

13

Shell ovoid, slightly compressed, without spines (Fig. 3e-f)

E. rotunda

-

Shell oviform or pyroid, usually with spines

14

14

Spines long

15

-

Spines short

16

15

Spines like needles, limited to the edge of the shell

E. filifera

-

Spines usually lanceolate, but not always clearly visible; spines limited to the edge and the posterior end of the shell.

E. compressa

 

 

 

 

Fig. 3: a-d E. strigosa c var. glabra e-f E. rotunda

 

16

 

Spines usually numerous, distributed all over the shell surface; Apertural scales clearly larger than the shell scales, about twice as wide; aperture usually round or slightly oval

E. ciliata

-

Spines usually short and numerous, distributed all over the shell surface; Apertural scales about the same size as the shell scales

E. strigosa

     
     
     
Key based on Hoogenraad en de Groot, 1940, and Edward Mitchell, 2003