Belongs within: Conoidea.Contains: Ophiodermella, Pseudotoma, Aphanitoma, Asthenotoma, Borsonella, Cordieria, Filodrillia, Maoritomella, Microdrillia, Typhlomangelia, Genota, Tomopleura, Borsonia (Borsonia), Zemacies, Bathytoma (Bathytoma), Bathytoma (Micantapex). The Borsoniidae are a diverse group of conoid gastropods primarily united by molecular data (Bouchet et al. 2011). Characters (from Bouchet et al. 2011): Shell small to large (5–80 mm), fusiform to biconic,… Continue reading Borsoniidae


Belongs within: Borsoniidae. Typhlomangelia is a genus of small conoids known from deep-water basins of the North Atlantic and Antarctic oceans (Powell 1966). Characters (from Powell 1966): Shell rather small, 12–14 mm, with tall spire of medially angulate whorls, and broadly ovate body-whorl, deeply excavated to relatively short, flexed, unnotched, spout-like anterior canal. Protoconch cylindrical… Continue reading Typhlomangelia


Belongs within: Borsoniidae. Microdrillia is a genus of small conoids known from the Indo-Pacific and Caribbean (Powell 1966). Characters (from Powell 1966): Shell small, 2.3–14 mm, claviform, with tall spire, and truncated anterior end. Protoconch narrowly conical of about five whorls, tip smooth, remainder axially costate. Sculpture of strong smooth spiral keels. Sinus area sunken… Continue reading Microdrillia


Belongs within: Borsoniidae. Zemacies: a toothless wonder Published 17 June 2016 What makes an organism a ‘living fossil’? The phrase is one that has been thrown about a bit over the years but whose actual definition can be ambiguous. Many people use it to refer to a species that is supposedly little changed from its… Continue reading Zemacies