Succinea

I don’t like beer, but I do remember the classic Budweiser tagline, This Bud’s for You.

Well … This Post’s for Me.

The long tentacles are for vision, the short ones are for olfaction. Members of the group respire in air. The pore, the pneumostome, allows respiratory gasses to reach the lung. Succinids live in wet, terrestrial, habitat.

11 thoughts on “Succinea

    • I cannot help myself … in telling you that tentacular retraction is under muscle control (and, therefore, quite fast) and that expansion of the same is achieved hydraulically (and, therefore, quite slow). Retraction does not occur by wholesale collapse … it’s much more like folding in the tip of a finger of a glove. Excuse the zoological minutia.

      • Any idea why there are different mechanisms for expansion and contraction? Is there any known advantage to dual mechanisms, or might things have evolved that way by chance without any benefit?

        • That’s a great question. Imagine a box with musculature, on the inside – and connected to a single anchor point. When the muscles contract – the box collapses. Now … you’ve got to expand the box – without muscles on the outside to pull the box open! Nature’s solution has been to make expansion – hydraulic. This same principle applies to cycles of contraction and re-expansion in many invertebrate systems. Vertebrates are much more efficient in that bone provides lots of possible points for attachment of muscle. You flex your arm, around the elbow joint, by contracting the biceps … and then extend the arm by contracting the triceps … the antagonist to the biceps … no hydraulics needed.

      • No excuse needed. It’s all interesting even to a simple layman such as myself. I’ve noticed that the tentacles move slowly although I had not thought of it as glove-like.

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