| |
Characters |
Species |
| 1a. |
Carapace longer than wide |
2 |
| 1b. |
Carapace as long as wide |
7 |
| 2a. |
Augenrest longer than wide |
3 |
| 2b. |
Augenrest wider than long, with rounded, posterior angle, assymetrical along the horizontal axis [carapace much longer than wide; lateral borders between outer orbital spine and cervical groove covered with tubercles; behind cervical groove borders smooth, parallel; rostrum short, narrow, with truncated edge; projection of orbital margin intercepts longitudinal axis at angle c. 75o; spines on the upper orbital margin present; hepatic tubercles present; groups of hepatic pits present; three pairs of pits (I-III, compare Figure 2.1) present] |
E. aequilatus |
| 3a. |
Rostrum incised in the middle |
4 |
| 3b. |
Rostrum without incision |
5 |
| 4a. |
Pairs of pits: I-III present [pair of groups of hepatic pits present; lateral borders smoth; hepatic tubercles weakly visible; augenrest 1.75x longer than wide, symmetric along horizontal axis; projection of orbital margin intercepts longitudinal axis at angle c. 60o (Figure 2.3)] |
E. guenteri n. sp. |
| 4b. |
Pairs of pits I-III absent [only the tip of the mesogastric region is distinct; posterior margin of carapace not incised, and not surrounded by with a furrow] |
E. rostratus |
| 5a. |
Species relatively small (about 4 mm max. carapace width) |
6 |
| 5b. |
Species relatively large (about 17 mm max. carapace width) [rostrum short; hepatic tubercles faint; groups of hepatic pits present; lateral margis of carapace covered with small serrations; augenrest 1.4-1.5x longer than wide, symmetric along the horizontal axis; projection of orbital margin intercepts longitudinal axis at about 55 degree angle; pairs of pits: I-III absent (Figure 2)] |
E. grandis |
| 6a. |
Rostrum long, broad; lateral borders of the carapace are smooth; carapace narrowing posteriorly; hepatic tubercles small; groups of hepatic pits faint; augenrest barely longer than wide (1.1x), subtriangular, asymmetric along the horizontal axis, with an elevated posterior angle; projection of orbital margin intercepts longitudinal axis at about 50 degree angle; pairs of pits I-III absent (Figure 2) |
E. rotundus n. sp. |
| 6b. |
Rostrum long, strongly narrowing anteriorly; lateral borders of the carapace are smooth; carapace only slightly narrowing posteriorly; hepatic tubercles absent; groups of hepatic pits are faint; augenrest 1.2x longer than wide, subtriangular, asymmetric along the horizontal axis; projection of orbital margin intercepts longitudinal axis at about 50 degree angle; I pair of pits present (Figure 2) |
E. hyznyi n. sp. |
| 7a. |
Carapace strongly narrowing posteriorly |
8 |
| 7b. |
Carapace only slightly narrowing posteriorly |
9 |
| 8a. |
Species relatively large (c. 24 mm max. carapace width); augenrest long, projection of orbital margin intercepts longitudinal axis at about 50 degree angle; groups of hepatic pits present; cervical and branchio-cardiac grooves are deep; branchio-cardiac groove reaches the posterior border of the carapace; pairs of pits I-III absent |
E. dobrogea |
| 8b. |
posterior part of the carapace behind the branchio-cardiac groove is very short and narrow; cardiac region reaching posterior margin of the carapace |
E. depressus |
| 9a. |
Augenrest perpendicular to longitudinal axis of the carapace; cervical and branchio-cardiac grooves are equally deep |
E. polyphemi |
| 9b. |
Cervical groove is deep, branchio-cardiac groove is shallow |
E. nitidus |
