Systematic Zoology

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Wendler, Sabrina

B.Sc. Sabrina Wendler

wendler"Computergest├╝tzte 3D-Rekonstruktion von Teuthirostria cancellata Moskalev, 1976" (Gastropoda: Cocculinoidea)

Abstract: The inner anatomy of the cocculinid limpet Teuthirostria cancellata (Moskalev 1976), which feeds on decaying cephalopod beaks, what is untypical for the Cocculinidae, was investigated. By histology and computer-aided 3D-reconstruction it was not only possible to get a good sterical impression of the animal, but also to follow delicate or spiry organs like the nervous system and the intestinum. Despite the untypical feeding biology the morphology of T. cancellata is basically similar to other cocculinid limpets investigated so far. Accordingly, the radula is typically rhipidoglossate, a single dorsal jaw is present, the gill is pseudoplicatid, only a single left kidney is present and there is a true hermaphroditic gland with a glandular gonoduct. Moreover, each of the statocysts includes a single statolith, the shell is symmetrically cup-shaped, the shell muscles form distinct muscle bundles and the mantle cavity is shallow. However, T. cancellata shows some morphological specifics, too. For example the salivary glands are convoluted tubes, the esophagus is straight and the single jaw is prominent. According to Strong et al. (2003) these characteristics are primordial and therefore T. cancellata is considered to be a basal representative of the Cocculinidae. In addition, during the investigation, the suspicion occurred that the observed specimen is possibly an immature one. This would explain the absence of the osphradium, the undersized gill, the undefined hermaphroditic gland and comparatively small size. A comparison with the sister family of the Cocculinidae, the Bathysciadiidae, moreover showed that T. cancellata shares their substrate, but not their morphological adaptations on this.

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