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Guest Anonymous

Why do some names have a cross?

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Guest Anonymous

why do some names in the phylogeny explorer project have a cross next to the name?

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A cross next to the name means its extinct.

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That's right, a cross or sword type symbol is often used as an instant visual marker to distinguish extinct from extant taxa and is of particular use in lists, databases, trees and dendrograms of living (when comnbined of course  with previously living) organisms. You will find errors on the current Explorer which we will not be correcting as we are focusing on a new tree whilst the current one remains for interest. To determine whether a taxon is extinct, all of its descendents (branches and leaf nodes/species) must also be extinct. If this is not the case (e.g. with dinosaurs), then the taxon or clade node must be listed as extant. Put simply, where an extinct symbol is on any branch node, you could snip (the branch off there) or colour code it to show that it is entirely extinct without exception from that point forth, moving to the more recent.

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