The state of systematics of North American Baetis Leach, 1815 (Ephemeroptera: Baetidae), with recommendations for identification of larvae Author Webb, J. M. Author Jacobus, Luke M. Author Sullivan, S. P. text Zootaxa 2018 2018-03-13 4394 1 105 127 journal article 30538 10.11646/zootaxa.4394.1.6 e98be1e7-35ba-4f9d-877f-0c9f7f5514e8 1175-5326 1196864 5677F63A-69D1-4749-A770-6ACA48F6B51E Baetis alius group This species group was proposed to include Baetis alius , Baetis moqui and B. pluto (Wiersema et al. 2004) , but Baetis moqui was synonymized with B. alius (McCafferty et al. 2008) . Larvae are readily distinguished from other species groups by the shape of the labial palps (Fig. 18) and by the more elongate mouthparts, including the labrum (Fig. 29). Baetis pluto is found primarily in the Appalachian Mountains (McCafferty & Randolph 1998) and possesses a dark band on the caudal filaments. Baetis alius is known from the Rocky Mountains westward (McCafferty et al. 2012) and lacks a dark band on the caudal filaments.