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2012
Abstract Phylogenetic relationships and identifications in the aplacophoran taxon Solenogastres (Neomeniomorpha) are in flux largely because descriptions of hard parts––sclerites, radulae, copulatory spicules––and body shape have often not been adequately illustrated or utilized. With easily recognizable and accessible hard parts, descriptions of Solenogastres are of greater use, not just to solenogaster taxonomists, but also to ecologists, paleontologists, and evolutionary biologists.
Journal of Molluscan Studies
Integrating 3D microanatomy and molecules: natural history of the Pacific freshwater slug Strubellia Odhner, 1937 (Heterobranchia: Acochlidia), with description of a new species2011 •
Acta Zoologica
Heartless and primitive? 3D reconstruction of the polar acochlidian gastropod Asperspina murmanica2009 •
ABSTRACT This study re-examines in detail the microanatomy of the Arctic opisthobranch Asperspina murmanica, the only acochlidian that was described as retaining a well-developed mantle cavity, and evaluates its supposedly basal position within the Acochlidia. Several specimens were recollected at the type locality in Russia. Spicules and radulae were studied by scanning electron microscopy. Semithin sections were prepared and a computer-based three-dimensional reconstruction of all major organ systems was made using amira software. Our results show significant differences from the original description, e.g. the nervous system shows paired rhinophoral and gastro-oesophageal ganglia and large aggregations of precerebral accessory ganglia, whereas the presence of a postulated posterior genital ganglion can be excluded; the radula is asymmetric; the circulatory system includes a small heart; and the reproductive system comprises a sac-like ampulla and three female glands. The most surprising discrepancy to the original description refers to the complete absence of any mantle cavity. The gonopore, anus and nephropore open separately to the exterior. Instead of being aberrant or basal, A. murmanica fits well with other Asperspina species and comes closest to the Mediterranean Asperspina rhopalotecta. The monotypic genus/family Minicheviella/Minicheviellidae Starobogatov (1983) is confirmed as a junior synonym of Asperspina/Asperspinidae Rankin (1979).
2004 •
The soft-bodied fossils preserved in Burgess Shale-type deposits provide a unique window on the origin and early evolution of complex animals some 500 million years ago, but their relationships to modern phyla can be difficult to determine. Using new fossils collected by the Royal Ontario Museum, I reconstruct the morphology, ecology and affinity of three contentious fossil organisms: Wiwaxia corrugata, Odontogriphus omalus, and Nectocaris pteryx. Nectocaris pteryx is reconstructed as a dorso-ventrally flattened organism with flexible tentacles, lateral fins, internal gills, camera-type eyes, and an axial cavity and funnel that were adapted for efficient jet propulsion. Detailed analysis of the slug-like animals Wiwaxia and Odontogriphus revises some anatomical interpretations, in particular showing that their mouthparts represent serial unipartite rows that comprise multiple teeth. Despite the proposed similarities between Wiwaxia sclerites and annelid chaetae, my new observations are not consistent with an annelidan interpretation. The relationships of these taxa are evaluated using Maximum Parsimony and Bayesian approaches, based on 59 taxa coded for 804 ‘characters’. Both methods strongly support the molluscan affinity of Odontogriphus and Wiwaxia, and indicate that Nectocaris is related to the cephalopods. Nectocaris would place the origin of the cephalopods much earlier than the fossil record suggests, whereas the basal position of Odontogriphus and Wiwaxia implies that the molluscs had a non-mineralized early history, evolving from ancestor that had a Wiwaxia-like scleritome.
Organisms Diversity & Evolution
Undersized and underestimated: 3D visualization of the Mediterranean interstitial acochlidian gastropod Pontohedyle milaschewitchii (Kowalevsky, 1901)2008 •
2009 •
Journal of Molluscan Studies
Sacoglossa or Acochlidia? 3D reconstruction, molecular phylogeny and evolution of Aitengidae (Gastropoda: Heterobranchia)2011 •
Zoological Journal of the Linnean …
Towards a phylogeny of gastropod molluscs: an analysis using morphological characters1997 •
Journal of Morphology
Computer-based three-dimensional reconstruction of the anatomy ofMicrohedyle remanei (Marcus, 1953), an interstitial acochlidian gastropod from Bermuda2006 •
2019 •
Organisms Diversity & Evolution
Interactive 3D anatomy and affinities of the Hyalogyrinidae, basal Heterobranchia (Gastropoda) with a rhipidoglossate radula2011 •
2011 •
1988 •
Journal of Molluscan Studies
Microanatomy, shell structre and molecular phylogeny of Leptogyra, Xyleptogyra and Leptogyropsis (Gastropoda: Neomphalida: Melanodrymiidae) from sunken wood2008 •
Zoological Journal of the Linnean Society
Systematics and phylogeny of the caryophyllidia-bearing dorids (Mollusca, Nudibranchia), with descriptions of a new genus and four new species from Indo-Pacific deep waters2001 •
The Biological Bulletin
Central Nervous System of Chaetoderma japonicum (Caudofoveata, Aplacophora): Implications for Diversified Ganglionic Plans in Early Molluscan Evolution2007 •
Journal of Molluscan Studies
ON THE ORIGIN AND EVOLUTION OF MAJOR GASTROPOD GROUPS, WITH SPECIAL REFERENCE TO THE STREPTONEURA1988 •
Evolution: Education and Outreach
Monoplacophorans and the Origin and Relationships of Mollusks2009 •
Journal of Molluscan Studies
3D-anatomy of the ctenoglossate limpet Kaiparapelta (Vetigastropoda: Lepetelloidea)2014 •
Journal of Morphology
Interactive 3D anatomy and affinities of Bathysciadiidae (Gastropoda, Cocculinoidea): deep-sea limpets feeding on decaying cephalopod beaks2011 •
Organisms Diversity & Evolution
3D-microanatomy and histology of the hydrothermal vent gastropod Lurifax vitreus Warén & Bouchet, 2001 (Heterobranchia: Orbitestellidae) and comparisons with Ectobranchia2014 •
Marine Biodiversity
3D-microanatomy of the mesopsammic Pseudovermis salamandrops Marcus, 1953 from Brazil (Nudibranchia, Gastropoda)2014 •
Journal of Molluscan Studies
Life on a leaf: 3D-reconstruction and description of a new limapontiid sacoglossan (Gastropoda: Heterobranchia: ‘Opisthobranchia’) living on the seagrass Halophila ovalis2014 •
2017 •
2006 •
Invertebrate Biology
On bivalve phylogeny: a high-level analysis of the Bivalvia (Mollusca) based on combined morphology and DNA sequence data2005 •
Zoological Journal of the Linnean Society
Evolutionary relationships of euthyneuran gastropods (Mollusca): a cladistic re-evaluation of morphological characters2002 •
2012 •
2008 •
2011 •