Furry colus Colus pubescens, copyright E. A. Lazo-Wasem.
Colus has been used as the idea of a household group title at many ranges of whelk classification, whether or not or not it’s Colidae, Colinae or Colini. The gastropod classification laid out by Bouchet et al. (2017) recognised ‘Colini’ as a various tribe inside the primary whelk household Buccinidae, together with a variety of cold-water taxa. Nonetheless, a more moderen phylogenetic evaluation of the buccinoids by Kantor et al. (2021) discovered Bouchet et al.‘s idea of Colini to be polyphyletic, putting the sort genus Colus outdoors what the referred to as the ‘core Buccinoidea’. As such, they raised Colidae to the standing of a separate household and restricted it to simply two genera, Colus and Turrisipho.
On this restricted kind, the Colidae are thin-shelled, medium-sized to massive whelks with the biggest having shells as much as twenty centimetres in size. The shells are fusiform to ovate in form with a kind of elongate siphonal canal and lined by a brown periostracum. Axial sculpture is absent; spiral sculpture is expressed as kind of distinguished cords. The aperture is closed with a operculum bearing a terminal nucleus. The animal has a kind of lengthy proboscis. The radula bears three tooth per row; the center tooth has a kind of sq. base and one to 3 cusps, with the center cusp the biggest, whereas the lateral tooth bear three hooked cusps with the outermost cusp considerably bigger than the opposite two. None of those options, it needs to be famous, is completely distinctive to the Colidae (Kantor et al. 2021).
Members of the Colidae are discovered within the Arctic and northern Atlantic Oceans, from subtidal to bathyal depths. As a result of they don’t seem to be focused commercially, the life habits of colids haven’t been effectively studied. Nonetheless, what we do know signifies that they’re probably predators on different invertebrates (Kosyan 2007). The lengthy proboscis of most species might be used to drag infaunal animals resembling amphipods and bivalves out of their burrows. Colids have well-developed salivary glands and it’s attainable that these could produce toxins as present in different neogastropods. They don’t have something like the flowery venom supply setups like these discovered within the conoids, however even just a little dose of poisonous saliva helps to subdue a struggling crustacean.
Bouchet, P., J.-P. Rocroi, B. Hausdorf, A. Kaim, Y. Kano, A. Nützel, P. Parkhaev, M. Schrödl & E. E. Robust. 2017. Revised classification, nomenclator and typification of gastropod and monoplacophoran households. Malacologia 61 (1–2): 1–526.
Kantor, Y. I., A. E. Fedosov, A. R. Kosyan, N. Puillandre, P. A. Sorokin, Y. Kano, R. Clark & P. Bouchet. In press 2021. Molecular phylogeny and revised classification of the Buccinoidea (Neogastropoda). Zoological Journal of the Linnean Society.
Kosyan, A. R. 2007. Morphological options, ecology, and distribution of poorly studied molluscan genera of the Colinae subfamily (Gastropoda, Buccinidae) from the far japanese seas of Russia. Oceanology 47 (4): 531–536.