Topic
Cornulites
About: Cornulites is a research topic. Over the lifetime, 37 publications have been published within this topic receiving 514 citations.
Papers
TL;DR: Differences between Cornulites and Conchicolites indicate that the two taxa were probably unrelated and that cornulitids may be a polyphyletic taxon, and its morphologic features need further revision to affiliate this group with certainty to any extant animal phylum.
Abstract: The following differences were found between the members of the cornulitids, Cornulites and Conchicolites. Both genera have egg-shaped embryonic shells, which presumably calcified after the settling of larva to the substrate, but the embryonic shells in Cornulites are larger than in Conchicolites. Cornulites has a regularly foliated shell ultrastructure and pseudopuncta, whereas the shell ultrastructure in Conchicolites is prismatic. In Cornulites the outer part of the shell contains numerous vesicular cavities that were never observed to cross the interspaces of the surface annulae, indicating cyclic shell secretion. In several species the vesicles are internally coated by calcitic lamellae that are oriented subparallel to the shell surface. In Conchicolites the vesicular shell structure is absent and the calcitic prisms are deposited at the shell aperture more or less at right angles to the longitudinal shell axis. The function of the surface annulae in Cornulites and transverse ridges in Conchicolites may have been to strengthen the shell wall and protect it against longitudinally developing cracks. Vesicular structure in Cornulites seems to have provided a stronger shell for less material and smaller cost of energy. Differences between Cornulites and Conchicolites indicate that the two taxa were probably unrelated and that cornulitids may be a polyphyletic taxon. Cornulites shares the most characters with the lophoporates and tentaculitids. Biological affinities of Conchicolites are controversial, and its morphologic features need further revision to affiliate this group with certainty to any extant animal phylum.
57 citations
TL;DR: The life position and feeding currents of M reidfordi Crickmay (Upper Devonian of Canada) were deduced from commensal Cornulites as mentioned in this paper.
50 citations
1 Jan 2007
TL;DR: The first record of Cornulites sp. as an epibiont on brachiopods from the middle Ashgill, Late Ordovician of the South China Palaeoplate was made by as mentioned in this paper.
Abstract: This is the first record of Cornulites sp. as an epibiont on brachiopods from the middle Ashgill, Late Ordovician, of the South China Palaeoplate. Twenty-one cornulitid specimens were found attached to the brachiopod shells of Altaethyrella zhejiangensis and Ovalospira dichotoma. Both the location of cornulitids and their orientation on the brachiopod shells indicate a possible commensal relationship between the cornulitids and their hosts.
39 citations
TL;DR: The crinoid Glyptocrinus provided an elevated substrate on the Cincinnatian seafloor suitable for exploitation by platyceratid gastropods and their attached epizoans, notably Cornulites, a tubiculous, suspension-feeding worm-like organism as discussed by the authors.
Abstract: The crinoid Glyptocrinus provided an elevated substrate on the Cincinnatian seafloor suitable for exploitation by platyceratid gastropods and their attached epizoans, notably Cornulites, a tubiculous, suspension-feeding worm-like organism. The presumably coprophagous platyceratids served as a substrate for settling larvae of Cornulites. Seven species of platyceratid gastropods belonging to the genera Cyclonema and Naticonema have been found with cornulitids attached commensally in several stereotypic locations on the shell. Some cornulitid individuals survived partial overgrowth by the snail shell and continued to live commensally on the snail. Whether coprophagous on the crinoid fecal wastes or not, the platyceratids and associated cornulitids represent opportunistic secondary tierers which occupied an optimally elevated position on the calices of Glyptocrinus, above an unstable, mud bottom substrate
36 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2021 | 2 |
| 2019 | 1 |
| 2018 | 2 |
| 2017 | 1 |
| 2013 | 1 |
| 2012 | 4 |