Strong, Ellen E.; Garner, Jeffrey T.; Johnson, Paul D.; Whelan, Nathan V.
A systematic revision of the genus Juga from fresh waters of the Pacific Northwest, USA (Cerithioidea, Semisulcospiridae)
Fig. 22. Type material of Juga nigrina (I. Lea, 1856). A. Melania nigrina I. Lea, 1856. Lectotype, USNM 118992. B. Melania shastaensis I. Lea, 1856. Lectotype, USNM 119283. C. Goniobasis circumlineata Tryon, 1865. Lectotype, ANSP 27573. D. Goniobasis chacei Henderson, 1935. Holotype, UCM 18058a. E. Goniobasis coquillensis Henderson, 1935. Holotype, UCM 21168a. F. Goniobasis orickensis Henderson, 1935. Holotype, UCM 17710a. G. Goniobasis yrekaensis Henderson, 1935. Holotype, UCM 17735a. H. Goniobasis yrekaensis obscura Henderson, 1935. Holotype, UCM 17724a. Scale bar = 1 cm.
Fig. 23 (previous page). Shell morphology of Juga nigrina (I. Lea, 1856). A–Y. Sequenced vouchers, arranged roughly from North to South. A. USNM 1413363. B. USNM 1295028. C. USNM 1413381. D. USNM 1413379. E. USNM 1295167. F. Topotypic (Goniobasis coquillensis Henderson, 1935), USNM 1295185. G. USNM 1295096. H. USNM 1295110. I. USNM 1413249. J. USNM 1413264. K. USNM 1413259. L. USNM 1295103. M–N. Topotypic (Goniobasis yrekaensis obscura Henderson, 1935). M. USNM 1295142. N. USNM 1295145. O. USNM 1413273. P. USNM 1295129. Q. USNM 1413294. R. USNM 1413327. S. Topotypic (Goniobasis chacei Henderson, 1935), USNM 1295125. T–U. Topotypic (Melania nigrina I. Lea, 1856). T. USNM 1413110. U. USNM 1413109. V. Topotypic (Goniobasis yrekaensis Henderson, 1935), USNM 1413125. W. Topotypic (Goniobasis orickensis Henderson, 1935), USNM 1413121. X. USNM 1413063. Y. USNM 1413068. Z. USNM 531319. A’. USNM 58932. B’. USNM 59040. C’. USNM 85269. D’. USNM 120900. Scale bar = 1 cm.
Fig. 24. Radular morphology of Juga nigrina (I. Lea, 1856) (USNM 1413111, topotypic). A. View of the anterior radular ribbon. B. Detail of cutting edge of rachidian and lateral teeth. C. Detail of lateral teeth cusps. D. Detail of rachidian cusps. E. Inner and outer marginal teeth. F. Detail of inner and outer marginal teeth cusps. Scale bars: A = 200 µm; B–C = 50 µm; D, F = 40 µm; E = 100 µm.
Fig. 21. Distribution maps. A. Juga newberryi (I. Lea, 1860). B. Juga nigrina (I. Lea, 1856). C. Juga occata (Hinds, 1844). Red stars, type localities; black dots, sequenced specimens; gray dots, unsequenced museum material. Abbreviations: CA = California; NV = Nevada; OR = Oregon; WA = Washington.