Alcadia hjalmarsoni explained

Alcadia hjalmarsoni is a species of an operculate land snail, terrestrial gastropod mollusk in the family Helicinidae.

Description

The height of the shell attains 5 mm, its greatest diameter 8 mm.

(Original description in Latin) The conoid-depressed shell is somewhat solid, smooth and slightly shiny. It is tawny with a purplish tint near the suture and aperture. The spire is convex and somewhat pointed. There are 4 whorls, which are somewhat flat and gradually increase in size. The body whorl is depressingly rounded with an arched fissure near the columella. The aperture is nearly diagonal and somewhat semi-oval. The columella descends at a right angle from the base, is slightly twisted, and scarcely recedes, emitting a thin, defined callus. The peristome is obtuse and yellow-bordered, with the right margin slightly curved forward. The operculum is thin and tawny.^[1]

Distribution

This species occurs in Puerto Rico.

Further reading

• Richling . I. . Glaubrecht . M. . The types of Neotropical Helicinidae (Mollusca, Gastropoda, Neritopsina) in the Malacological Collection of the Museum für Naturkunde Berlin: an annotated catalogue, with emphasis on Cuban land snails . Zoosystematics and Evolution . 2008 . 84 . 2 . 265-310.
• Book: van der Schalie . H. . The land and fresh-water mollusks of Puerto Rico . 1948 . Museum of Zoology, University of Michigan, Miscellaneous Publications. no. 70 . Ann Arbor.

Notes and References

1. Pfeiffer . L. . Diagnosen neuer Landschnecken . Malakozoologische Blätter . 1856 . 3 . 12 . 43-48 .