Marocaster is an extinct genus of sea stars in the family Goniasteridae. It existed in what is now Morocco during the early Cretaceous period. It was described by Daniel B. Blake and Roland Reboul in 2011, and the type species (and only species) is Marocaster coronatus.
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👉 Marocaster coronatus in the context of Holotype
A holotype is a single physical example (or illustration) of an organism that is the one that was used when the species (or lower-ranked taxon) was formally described. It may be the only such physical example (or illustration), or it may have been explicitly designated as the holotype from among several examples. Under the International Code of Zoological Nomenclature (ICZN), there are several kinds of name-bearing types, and a holotype is one of them. Between the International Code of Nomenclature for algae, fungi, and plants (ICN) and the ICZN, the definitions of types are similar in intent but not identical in terminology or underlying concept.
For example, the holotype for the butterfly Plebejus idas longinus is a preserved specimen of that subspecies, held by the Museum of Comparative Zoology at Harvard University. In botany and mycology, an isotype is a duplicate of the holotype, generally pieces from the same individual plant or samples from the same genetic individual.
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Marocaster coronatus in the context of Type (biology)
In biology, a type is a particular specimen (or in some cases a group of specimens) of an organism to which the scientific name of that organism is formally associated. In other words, a type is an example that serves to anchor or centralizes the defining features of that particular taxon. In older usage (pre-1900 in botany), a type was a taxon rather than a specimen.
A taxon is a scientifically named grouping of organisms with other like organisms, a set that includes some organisms and excludes others, based on a detailed published description (for example a species description) and on the provision of type material, which is usually available to scientists for examination in a major museum research collection, or similar institution.