A new species of Pseudocentroptiloides (Ephemeroptera: Baetidae), with revisions to other previously unnamed baetid species from Texas

摘要

Pseudocentroptiloides morihari, new species, is described from larvae and male and female adults from Texas, USA. The species represents the second of the genus to be discovered in North America, where it is distinguished from P. usa primarily by size, labral and maxillary morphology, and ventral abdominal pattern in the larvae. Pseudocentroptiloides morihari was previously reported as Centroptilum sp. 2. Some other unnamed but numbered species of Baetidae reported from Texas are resolved to known nominal species of Acerpenna, Baetis, and Centroptilum, and the status of others is reviewed. Difficulty in separating adult males of Pseudocentroptiloides and some Procloeon is noted.