Goniobasis rubiginosa I. Lea, 1862

Strong, Ellen E., Garner, Jeffrey T., Johnson, Paul D. & Whelan, Nathan V., 2022, A systematic revision of the genus Juga from fresh waters of the Pacific Northwest, USA (Cerithioidea, Semisulcospiridae), European Journal of Taxonomy 848, pp. 1-97 : 82

Goniobasis rubiginosa I. Lea, 1862

This name was established by Lea (1862: 270; 1863a: 333–334, pl. 38 fig. 193; 1863b: 155–156, pl. 38 fig. 193) based on two specimens sent to him by Wesley Newcomb, M.D., from “ Oregon ”. Tryon (1864, 1865, 1866, 1873) considered the species to be valid, despite having seen specimens only from Lea’s collection, and was confident they would be plicate if the initial whorls were not eroded ( Tryon 1865: 244). Pilsbry (1899) also considered the species to be valid. Henderson (1929) identified two specimens as this species in a lot of eight from Ahtanum Creek, Union Gap, in Yakima County, Washington; the other specimens in the lot were identified as Goniobasis draytonii . Henderson (1936b: 274) later admitted that one of the specimens was quite young, and in the other the carina was evidently the “result of disease or injury”. As mentioned above, the lot in question (UCM 15814) appears to be J. bulbosa as circumscribed herein and it does not resemble Lea’s (1863a, 1863b: pl. 38 fig. 193) original illustration of rubiginosa ( Fig. 27B ). Frest & Johannes (1995a: 246) provided the common name “Rusty Juga ”, and listed J. (J.) rubiginosa among species of uncertain status but considered it a potentially valid species and local endemic of conservation concern owing to agricultural impacts in the Yakima Valley. Later, Frest& Johannes (2010: 6) indicated it could be J. plicifera , but again expressed doubts as to its identity as a Juga . Other authors have considered the species to be conspecific with J. silicula ( Goodrich, 1942; Burch & Tottenham 1980; Burch 1982, 1989). J.P.E. Morrison annotated the label of the lectotype, USNM 119297 ( Graf 2001; Fig. 27B ), that the locality was incorrect, and was “probably North or South Carolina ”. Given that no Juga species are known to possess a single, prominent spiral keel, we agree with the interpretation of Morrison that this species is a mislocalized eastern North American pleurocerid. The paralectotype is filed under Elimia symmetrica (Haldeman, 1841) in the USNM collections. Three paralectotypes in the Newcomb collections at the Paleontological Research Institute (PRI 21730) appear conspecific with the specimens in the USNM.

Figures

Fig.27. Species erroneously attributed to Juga H.Adams &A.Adams, 1854. A. Goniobasis columbiensis Whiteaves, 1905, syntype (CMML 2042), original figure (Whiteaves 1905: pl. 2 fig. 11). B. Goniobasis rubiginosa I. Lea, 1862, lectotype (Graf 2001: 91) (USNM 119297), original figure (Lea 1863a, 1863b: pl. 38 fig. 193). Scale bar = 1 cm.