Spathognathodontidae Hass, 1959

Slavík, Ladislav, 2011, Lanea carlsi conodont apparatus reconstruction and its significance for subdivision of the Lochkovian, Acta Palaeontologica Polonica 56 (2), pp. 313-327 : 321

Family Spathognathodontidae Hass, 1959 Genus Lanea Murphy and Valenzuela−Ríos, 1999 Type species: Ozarkodina eleanorae Lane and Ormiston, 1979 , Salmontrout River Area, East−Central Alaska, Lochkovian.

Remarks.— Murphy and Valenzuela−Ríos (1999) proposed this genus based on recurrent characteristics in several species of the middle Lochkovian Spathognathodontidae . Although the overall characteristic of their new genus is robust, the authors admitted that at the dawn of the Lanea clade, its early members show similarities to coeval taxa. The genus Lanea in the sense of this paper is extended to include Lanea carlsi ( Boersma, 1973) and “ Lanea omus beta” Murphy and Matti, 1983. As was mentioned above, the main reason for generic relocation of these taxa is their stronger similarity with the Lanea clade, showing more common characters than with Ancyrodelloides . Most of the typical features in Pa element of L. carlsi are identical with the coeval L. omoalpha . The characteristics of the apparatus described below and its differences from the assumed apparatus of A. transitans support the modified taxonomical concept of both genera. The distinct morphological changes are well expressed in both apparatuses in spite of their relative stratigraphic proximity in the section. The suggested stratigraphic succession of the taxa in the Lanea clade is follows: L. omoalpha , L. carlsi , L. eoeleanorae + “ L. omus beta”, L. eleanorae , L. telleri .