Aulixidens eugeniae, Bohlke, 1952

Mirande, Juan Marcos, 2010, Phylogeny of the family Characidae (Teleostei: Characiformes): from characters to taxonomy, Neotropical Ichthyology 8 (3), pp. 385-568 : 537-538

Autapomorphies of Aulixidens eugeniae :

1. Form of anterior process of lateral ethmoid (14): (1> 0) broad in ventral view, contacting proximal region of vomer in its entire length. Reversal of synapomorphy 1 of node 179. Paralleled in Rhaphiodon vulpinus and Salminus brasiliensis .

2. Anterior convergence of ventral diverging lamellae with nasal septum of mesethmoid (31): (1> 0) absent, or confluent near anterior end of nasal septum. Paralleled in Coptobrycon bilineatus and Knodus breviceps .

3. Anterior end of ascending process of maxilla (94): (1> 0) with conspicuous notch. Paralleled in node 184.

4. Number of rows of premaxillary teeth (122): (1> 0) one. Paralleled in node 195 and in Carlana eigenmanni , Carnegiella strigata , Grundulus cochae , Odontostoechus lethostigmus , Paracheirodon axelrodi , Piabucus melanostomus , and Probolodus heterostomus .

5. Maxillary teeth (134): (1> 0) absent. Paralleled in Coptobrycon bilineatus , Iguanodectes geisleri , Parecbasis cyclolepis , and Stichonodon insignis . Some trees: Paralleled in Hyphessobrycon elachys and Psellogrammus kennedyi .

6. Number of maxillary teeth (135): (1> 0) only one, or absent. Paralleled in the Astyanax clade, in nodes 284 and 290, and in Cheirodon interruptus , Coptobrycon bilineatus , Hyphessobrycon bifasciatus , and Iguanodectes geisleri . Some trees: Paralleled in Hasemania nana , Paracheirodon axelrodi , and Parecbasis cyclolepis .

7. Number of maxillary teeth (136): (1> 0) up to three. Reversal of synapomorphy 8 of node 205. Paralleled in nodes 232 and 246.

8. Separation between posterior dentary teeth (147): (0> 1) more than width of these teeth. Paralleled in node 221 and in Astyanax cf. rutilus and Pristella maxillaris .

9. Posterior extent of ventral process of quadrate (151): (0> 1) falling short of posterior margin of symplectic. Paralleled in the Hyphessobrycon luetkenii clade and Iguanodectinae , in nodes 284, 289, and 298, and in Astyanax mexicanus , A. cf. rutilus , Cyphocharax spilotus , Diapoma speculiferum , Hemiodus cf. thayeria , Metynnis maculatus , Micralestes stormsi , Moenkhausia sanctaefilomenae , Nematocharax venustus , Probolodus heterostomus , Psellogrammus kennedyi , and Pseudocorynopoma doriae . Some trees: Paralleled in node 302.

10. Shape of ectopterygoid (156): (0> 1) triangular and much broadened anteriorly.

11. Form of anterior expansion of basihyal (191): (0> 1) expanded, with anterior margin with two-thirds or more of its length. Paralleled in Cyphocharax spilotus , Prodontocharax melanotus , and Thayeria obliqua.

12. Interhyal (210): (0> 1) absent. Paralleled in Engraulisoma taeniatum .

13. Transitional vertebrae with haemal canal (229): (0> 1) absent. Paralleled in nodes 195 and 212, and in Engraulisoma taeniatum , Metynnis maculatus , and Piabina argentea . Some trees: Paralleled in node 247 and in Bryconamericus alpha and Paracheirodon axelrodi .

14. Position of ventral margin of posttemporal (252): (1> 0) anterior to lateral margin of epioccipital. Paralleled in nodes 162, 285, and 301 and in Creagrutus anary , Diapoma speculiferum , Moenkhausia cf. intermedia , and Pyrrhulina australis . Some trees: Paralleled in node 247 and in Knodus breviceps .

15. Bony hooks on first pelvic-fin ray of adult males (315): (0> 1) present. Paralleled in node 274 and in Aphyocharacidium bolivianum , Aphyocharax anisitsi , and Nantis indefessus .

16. Scales covering caudal-fin lobes (328): (0> 1) covering onethird of their length. Paralleled in node 222 and in Distichodus maculatus , Markiana nigripinnis , and Nematocharax venustus . Some trees: Paralleled in Knodus breviceps .