Roche E M, Roche A F, Siervogel R M
Am J Phys Anthropol. 1979 Sep;51(3):389-92. doi: 10.1002/ajpa.1330510310.
An example is reported of a rare dermatoglyphic variant (absence of triradius d) in a woman of mixed European and Cherokee American Indian ancestry. This variant was not present in her parents, her five siblings, four nephews or one niece. Attention is drawn to the continuum from an absent triradius d to a triradius with an abbreviated main-line associated with either an open field in interdigital area IV, or a loop in interdigital area IV or a tented arch at d. This same continuum occurs at c. The absent triradius at d is extremely rare and the tented arch at d is very rare.
报道了一个例子，一名具有欧洲和切罗基美洲印第安人混合血统的女性存在一种罕见的皮纹变异（三叉点d缺失）。她的父母、五个兄弟姐妹、四个侄子和一个侄女均不存在这种变异。需注意从缺失的三叉点d到与指间区IV中的开放区域、或指间区IV中的箕纹、或d处的帐篷状弓纹相关联的具有缩短主线的三叉点的连续变化。在c处也出现同样的连续变化。d处缺失的三叉点极为罕见，d处的帐篷状弓纹非常罕见。
