The following phylogenetic tree is based on the YCC 2008 tree and subsequent published research as summarized by ISOGG. It includes all known subclades as of June 2015 (Trombetta et al. 2015)   Exceptional cases of men who are M215 positive but M35 negative ("E-M215*") have been discovered so far in two Amharas of Ethiopia and one Yemeni. At least some of these men, perhaps all, are known since early 2011 to be in a rare sibling clade to E-M35, known as E-V16 or E-M281. The discovery of M281 was announced by , who found it in two Ethiopian Oromo. found 5 more Ethiopian individuals and an equivalent SNP to M281, V16. It was in the 2011 paper that the family tree position (M215+/M35-) was discovered as described above. The E-M215 derivative, E-M35 is defined by the M35 SNP. 1 Turkmen individual from Jawzjan with a subclade defining mutation is referred to as E-M35*. As of June 2015, there is an increasingly complex tree structure which divides most men in E-M35 into two branches: E-V68 and E-Z827. The most frequently described subclades are E-M78, a part of E-V68, and E-M81, which is a branch of E-Z827. These two subclades represent the largest proportion of the modern E-M215 population. E-M78 is found over most of the range where E-M215 is found excluding Southern Africa. E-M81 is found mainly in North Africa. E-M123 is less common but widely scattered, with significant populations in specific parts of the Horn of Africa, the Levant, Arabia, Iberia, and Anatolia. A new clade (E-V1515) was defined by Trombetta et al. 2015, which originated about 12 kya (95% CI 8.6–16.4) in eastern Africa where it is currently mainly distributed. This clade includes the E-V42, E-M293, E-V92 and E-V6 subclades, which were identified as E-M35 basal clades in a previous phylogeny. E-V68, is dominated by its longer-known subclade E-M78. Three "E-V68*" individuals who are in E-V68 but not E-M78 have been reported in Sardinia, by , when announcing the discovery of V68.