SEMITUBINA YUKONENSISNEW SPECIES, FIRST OCCURRENCE OF THIS BIOGEOGRAPHICALLY DISTINCTIVE OLD WORLD REALM GASTROPOD GENUS IN THE LOWER DEVONIAN OF THE WESTERN HEMISPHERE

Abstract

Despite the rapidly expanding knowledge of Lower Devonian brachiopod faunas of the Western Cordillera of Canada (Lenz, 1976, 1977a, 1977b, 1982; Ludvigsen, 1970; Perry, 1984; Perry and Lenz, 1978; Perry et al., 1974, 1981), equivalent data on coeval gastropod faunas from this region are non-existent; to date, no publications have appeared in which gastropods have been described. Blodgett et al. (1988, table 1) provided faunal lists for two Lower Devonian localities in Western Canada: 1) Lochkovian-Emsian age collections from the Mackenzie Mountains, Northwest Territories, collected by the late D. G. Perry as part of his Ph.D. dissertation (Perry, 1984); and 2) an early Emsian collection from the Mt. Lloyd George area, British Columbia. We are currently examining the gastropod material recovered by A. C. Lenz from his richly diverse collections in the Royal Creek area, Yukon Territory, equivalent in age to those gathered by D. G. Perry from the Mackenzie Mountains. This note is the first of several papers focused on these paleobiogeographically significant faunas, and it is our desire to ultimately make clear the character of this Early Devonian province, which appears to include strata of British Columbia, Yukon and Northwest Territories, as well as the non-accreted portion of adjacent east-central Alaska. In this note, we describe a new species, Semitubina yukonensis n. sp., from two measured sections in the Royal Creek area, Yukon Territory. The geographic coordinates for sec. 1 (see Lenz, 1977a, fig. 1 for location) are 64°46′05″–64°46′25″N and 135°11′37″W. Those for Section 7A (see Lenz, 1982, fig. 1 for location) are 64°46′54″–64°47′18″N and 135°08′36″W. This highly ornate shell represents the first occurrence in the Lower Devonian of the Western Hemisphere of this distinctly Old World Realm gastropod genus. The illustrated specimens (holotype and paratype) are deposited in the …