Roeboexodon geryi

Abstract

Autapomorphies of Roeboexodon geryi: 1. Lateral opening between ventral diverging lamellae of mesethmoid and anterior process of lateral ethmoid (15): (0> 1) small, ovate and partially occluded by diverging lamellae of mesethmoid and anterior process of lateral ethmoid. Paralleled in Markiana nigripinnis and Roeboides descalvadensis. 2. Ventral projection of mesethmoid spine, forming a keel between premaxillae (26): (0> 1) present. Paralleled in node 253. 3. Bony lamellae bordering sensory canal of nasal (34): (0> 1) wider at some point than tubular region. Paralleled in nodes 174 and 181 and in Galeocharax humeralis and Leporinus striatus. 4. Ventral extent of third infraorbital (64): (1> 0) reaching horizontal arm of preopercle. Reversal of synapomorphy 3 of node 180. Paralleled in the Heterocharacinae and Iguanodectinae, in nodes 184, 198, 225, and 302, and in Agoniates anchovia, Brycon pesu, Hasemania nana, Markiana nigripinnis, Moenkhausia sanctaefilomenae, Pseudochalceus kyburzi, and Stichonodon insignis. Some trees: Reversed in node 292. 5. Development of transverse process of neural arch of third vertebra (219): (0> 1) well developed and extending beyond anterior margin of tripus.Paralleled in node 302, and in Agoniates anchovia, Cyanocharax alburnus, Deuterodon langei, Engraulisoma taeniatum, Hemiodus cf. thayeria, and Thayeria obliqua. Some trees: Paralleled in Microschemobrycon casiquiare and Parecbasis cyclolepis. 6. Posterior margin of cleithrum (234): (0> 1) with concavity ventral to first postcleithrum. Reversal of synapomorphy 4 of node 204. Paralleled in nodes 196 and 289 and in Probolodus heterostomus.