Juga H. Adams & A. Adams, 1854

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 : 10

publication ID

https://doi.org/ 10.5852/ejt.2022.848.1993

publication LSID

lsid:zoobank.org:pub:CD87E211-18D1-43DF-A4A4-70D8D111C969

DOI

https://doi.org/10.5281/zenodo.7464769

persistent identifier

https://treatment.plazi.org/id/03CD87B3-FFFB-FFAB-5072-FDD022BBB2ED

treatment provided by

Felipe (2022-12-12 12:12:50, last updated 2024-12-04 13:59:31)

scientific name

Juga H. Adams & A. Adams, 1854
status

 

Genus Juga H. Adams & A. Adams, 1854 View in CoL

Vibex (Juga) H. & A. Adams, 1854 .

Type species: Melania silicula A. Gould, 1847 , by subsequent designation ( Baker 1963: 35).

Juga (Calibasis) D.W. Taylor, 1966 .

Type species: Melania (? Goniobasis) acutifilosa Stearns, 1890 , by original designation. Syn. nov.

Juga (Oreobasis) D.W. Taylor, 1966 .

Type species: Melania newberryi I. Lea, 1860 , by original designation.

Juga (Idabasis) D.W. Taylor, 1966 †.

Type species: Juga chrysopylica D.W. Taylor, 1966 †, by original designation. Syn. nov.

Diagnosis

Shell dextral, smooth to strongly plicate, lirate or cancellate, medium to large in size, ~ 1.5–3.5 cm in length. Operculum corneous, brown, paucispiral with eccentric nucleus. Gonochoristic, oviparous, with broad, shallow, triangular ovipositor pore; convoluted gonoductal groove, proximal albumen gland u-shaped; seminal receptacle present; tightly interlocking folds of lateral and medial laminae of prostate gland; gelatinous, finger-like egg masses with large numbers of eggs. Radula taenioglossate, rachidian basal cusps weakly developed or lacking. Midgut with comparatively narrow glandular pad and wide, shallow, crescentic groove; digestive gland duct vestibule receiving several ducts of digestive gland.

Remarks

Until recently, extant species of Juga were distributed among three subgenera, based on the sculpture of the early whorls ( Taylor 1966): Juga s. str. with strong and sometimes shouldered plications or ribs, Calibasis with spiral or lirate sculpture sometimes giving a frilled appearance, and Oreobasis with essentially smooth early whorls. Taylor (1966) also recognized a fourth subgenus with cancellate early sculpture, Idabasis , based on the Blancan fossil, Juga chrysopylica Taylor, 1966 . According to Frest & Johannes (2010: 7), Taylor further subdivided Oreobasis into two sections in an unpublished checklist dated from 1977 which we have not seen.

Strong & Frest (2007) synonymized Oreobasis with Juga s. str. given their morphological similarity in reproductive and alimentary anatomy. Campbell et al. (2016) concluded that none of the three extant subgenera were monophyletic but that clades of equivalent rank merited recognition. The molecular analysis of Strong & Whelan (2019) confirmed that the strength and persistence of spiral and axial sculpture are variable within and between species, sometimes among conspecific individuals at a single site, and that subgeneric designations based primarily on shell sculpture are not meaningful. Moreover, the molecular phylogeny did not reveal clades that would merit recognition at the rank of subgenus. Thus, we here further synonymize Calibasis and Idabasis with Juga .

Baker H. B. 1963. Paludomidae (Pleuroceridae). The Nautilus 77: 34 - 35.

Campbell D. C., Clark S. A., Johannes E. J., Lydeard C. & Frest T. J. 2016. Molecular phylogenetics of the freshwater gastropod genus Juga (Cerithioidea: Semisulcospiridae). Biochemical Systematics and Ecology 65: 158 - 170. https: // doi. org / 10.1016 / j. bse. 2016.01.004

Frest T. J. & Johannes E. J. 2010 - 2011. Review of the species of Juga (western U. S. Cerithioidea, Pleuroceridae, Semisulcospirinae). Malacological Review 43 / 44: 1 - 61.

Gould A. A. 1847. Descriptions of the following species of Melania, from the collection of the Exploring Expedition. Proceedings of the Boston Society of Natural History 2: 222 - 225. https: // doi. org / 10.5962 / bhl. part. 3322

Lea I. 1860. Descriptions of four new species of Melanidae of the United States. Proceedings of the Academy of Natural Sciences of Philadelphia 12: 93. Available from https: // www. biodiversitylibrary. org / page / 1801109 [accessed 13 Mar. 2022].

Stearns R. E. C. 1890. Scientific results of explorations by the U. S. Fish Commission steamer Albatross. XVII. Descriptions of new West American land, freshwater, and marine shells, with notes and comments. Proceedings of the United States National Museum 13: 205 - 225. https: // doi. org / 10.5479 / si. 00963801.13 - 813.205

Strong E. E. & Frest T. 2007. On the anatomy and systematics of Juga from western North America (Gastropoda: Cerithioidea: Pleuroceridae). The Nautilus 121: 43 - 65.

Strong E. E. & Whelan N. V. 2019. Assessing the diversity of Western North American Juga (Semisulcospiridae, Gastropoda). Molecular Phylogenetics and Evolution 136: 87 - 103. https: // doi. org / 10.1016 / j. ympev. 2019.04.009

Taylor D. W. 1966. Summary of North American Blancan nonmarine mollusks. Malacologia 4: 1 - 172.

Kingdom

Animalia

Phylum

Mollusca

Class

Gastropoda

SubClass

Caenogastropoda

SuperFamily

Cerithioidea

Family

Semisulcospiridae