Deciphering the diversity and history of New World nightjars (Aves: Caprimulgidae) using molecular phylogenetics Author Sigurðsson, Snorri Author Cracraft, Joel text Zoological Journal of the Linnean Society 2014 2014-03-12 170 3 506 545 http://dx.doi.org/10.1111/zoj.12109 journal article 10.1111/zoj.12109 0024-4082 5346424 CHORDEILES TEXENSIS (LAWRENCE, 1856) Definition Previously Chordeiles acutipennis texensis . It is elevated to full species status and is the sister species of Chordeiles acutipennis Hermann, 1783 . Diagnosis Chordeiles texensis is similar morphologically to C. acutipennis , but is noticeably larger in size and paler in plumage, although C. a. littoralis and C. a. micromeris are somewhat intermediate in size between C. texensis and the remaining subspecies of C. acutipennis . Both ND2 and ACO1 I9 show genetic divergence between C. texensis and C. acutipennis , with over 2% divergence in ND2 sequences and 14 homologous substitution events. Comments Genetic evidence in this study supports the elevation of C. a. texensis to full species status ( Fig. 4 ). The other six subspecies of C. acutipennis remain as members of that species. Further study of the system is recommended, in particular regarding the status of C. a. littoralis and C. a. micromeris .