Three-horn Wartyback

Obliquaria reflexa

Diagnostics 5


  • size: small, maximum 55 mm. most under 40 mm
  • thickness: thick to very thick
  • shape: overall circular, with squared/angular posterior and rounded anterior. posterior ridge pronounced
  • width: moderately inflated
  • surface: mid-shell row of prominent 3-5 large flattened knobs, in alternating positions on each valve. ribbing on posterior slope close to hinge
  • beaks: elevated, pointed and curved inwards. sculptures: knobby, much like rest of shell.
  • color/markings: greenish, tan or brown, occasionally with thin green rays
  • sexual dimorphism: none
  • pseudocardinal teeth: massive, deeply serrated
  • lateral teeth: short, sharply angled with pseudocardinals
  • nacre: white, irridescent in posterior

Soft parts: foot white

Similar species/lookalikes: easily identified by the single row of few, large alternating knobs in mid-shell, which is diagnostic for the taxon. it resembles the mapleleaf Quadrula quadrula, but that species has a second row of nodules located on the posterior ridge.

Sources and Credits

  1. (c) Doug Shelton, some rights reserved (CC BY-NC-ND), uploaded by Philippe Blais,
  2. (c) Brian Wulker, some rights reserved (CC BY-NC),
  3. (c) Michael Gras, M.Ed., some rights reserved (CC BY), uploaded by Michael J. Gras, M.Ed.,
  4. (c) Michael J. Gras, M.Ed., some rights reserved (CC BY),
  5. Adapted by Philippe Blais from a work by (c) Wikipedia, some rights reserved (CC BY-SA),

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