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Sample records for acochlidiid parhedyle cryptophthalma

  1. Keeping Nerves: Central Nervous System of the Interstitial Acochlidiid Parhedyle cryptophthalma (Gastropoda, Opisthobranchia)

    DEFF Research Database (Denmark)

    Joerger, Katharina; Kristof, Alen; Klussmann-Kolb, Annette

    2008-01-01

    Unusually well-preserved fossils of a Halicyne-like cycloid crustacean frequently occur in the early Late Triassic lacustrine clay bed at Krasiejów in Opole Silesia, southern Poland. Its gill-like structures form a horseshoe-shaped pair of units composed of numerous calcified blades with reverse ...

  2. Keeping Nerves: Central Nervous System of the Interstitial Acochlidiid Parhedyle cryptophthalma (Gastropoda, Opisthobranchia)

    DEFF Research Database (Denmark)

    Joerger, Katharina; Kristof, Alen; Klussmann-Kolb, Annette

    2008-01-01

    close analogy, and possibly homology, with the respiratory areas of the Branchiura, serving mostly as ion-exchange organs. It is proposed that they originated, in connection with the body size increase and adaptation to fresh-water environment, as radially arranged infoldings of the respiratory areas...... cuticle, with strongly calcified rigid dorsal parts suspended from the carapace. At least three ecologically and anatomically distinct lineages were represented in the order Cyclida, which was probably initially confined to marine environments and gradually adapted to life in continental waters. New taxa......-shaped cross-section. Originally, these were parallel slits opening on the ventral surface of the carapace. Lobation of the posterior margin of the carapace, of unusually large mature size for the group, make the animal different from other members of Halicynidae, and the new name Opolanka decorosa gen. et sp...

  3. Redescription of the meiofaunal gastropod Parhedyle cryptophthalma, with focus on nervous system and sensory organs

    DEFF Research Database (Denmark)

    Jörger, Katharina M.; Kristof, Alen; Klussmann-Kolb, Annette

    2010-01-01

    on the visceral nerve cord), we found a putative osphradial ganglion for the first time in the microhedylacean clade. No osphradium, no Hancock’s organ and, in contrast to the original description, no pigmented eyes could be detected. Bundles of sensory cilia were found laterally on the head-foot complex......, rhinophoral, and pedal nerves and in single neurons in the anterior region of the foot sole. Central nervous and sensory features may greatly vary among acochlidians and other heterobranch taxa, and comprehensive comparative approaches are necessary to reveal their presence, function, homology, and evolution....