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About Types.
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I do have an old published list of some of the myriad types of 'types' compiled (in his words) by C.E. Decker (Curator at OU from 1916 to 1943): DEFINITIONS OF KINDS OF TYPE SPECIMENS
(ref: Dr. F.B. Horrell in Geological Society of America Bulletin, Vol. 49, 1929, p, 219)
Holotype - A single specimen on which a new species or subspecies is based.
Cotype (or Syntype) - Two or more specimens on which a new species or subspecies is based, no one specimen being designated as the holotype.
Paratype - A specimen mentioned as having been used in addition to the holotype in preparing the original description of a new species or subspecies for which a holotype is designated.
Lectotype - A single specimen selected by a later worker from the original cotypes of a species or subspecies as the holotype of that species or sub- species when the later worker finds that the original cotypes do not all belong to a single species or subspecies.
Neotype - A specimen selected to ta~:e the place of an original tvpe of a species or subspecies when the original type has been lost. A neotype may be either a neohololype or a neocotype.
Plesiotype (or Hypotype) - A specimen which was not used in the original description of a species or subspecies, but which is used for a later description or figure of it.
Heautotype: - A specimen figured by an Author as an illustration of a species or subspecies which had previouslv been described as new by him. This is really only one particular kind of a plesiotvpe.
Allotype - A specimen chosen by the original author of a species or subspecies, in addition to the holotype to show some part of the body not shovn in the holotvpe, This is really only one particular kind of a paratype, if it is chosen at the time when the species or subspecies is originally described, If chosen later, it is a particular kind of a plesiotype.
Onomatype - A specimen which has been cited in print (a cited scecimen), but which has not been used to illustrate anything not previouslv known about the morphology of the species or subspecies to which it is referred.
Morphotype - A specimen which has been figured in print (a figured specimen), but which has not been used to illustrate anything not previously known about the morphology of the species or subspecies to which it is referred.
Topotype - A specimen collected from the same horizon as the original holotype or cotypes and from the same locality as the originals, or within a few miles of that place.
Metatype - A topotype identified by the original describer of the species or subspecies to which it is referred, but at a date subsequent to the publication of the original description.
Homeotype - A specimen that has been identified by a worker who is recognized as an authority on the group of organisms to which it belongs, after the specimen has been carefully compared by, him with the original type or types of the species or subspecies to which it is referred.
Ideotype - A specimen collected from some other general locality than the original type (that is, not a topotype) that has been identified by the original author of the species or subspecies to which it is referred at a date subsequent to the publication of the original description. This is like a metatype, except that it does not come from the general locality from which the original type specimens of the species or subspecies were collected.

Thank you
Roger J. Burkhalter
Curatorial Specialist, Invertebrate Paleontology Sam Noble Oklahoma Museum of Natural History University of Oklahoma, Norman

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Last modified on Friday, 28 April 2017