The purpose of this application is to confirm Hyboclypus elatus Desor, 1 847 as the nominal type species of Desorella Cotteau, 1855. The original publication defining the Jurassic echinoid genus Desorella did not explicitly designate a type species. There is an indication that D. icaunensis Cotteau, 1855 was intended, but this conflicts with Cotteau's later (1873) choice of £>. elata (Desor, 1847) and with general usage. 1 . In 1 855 Cotteau founded the echinoid genus Desoria to accommodate five species: four described from the late Jurassic (Corallian: now within the Oxfordian Stage) of the Yonne district of France {Hyboclypus elatus Desor, 1847; Desoria icaunensis Cotteau, 1855; D. orbignyana Cotteau, 1855; D. drogiaca Cotteau, 1855), plus one species from the early Cretaceous (Neocomian) of Switzerland (Nucleopygus incisus Agassiz, 1840). 2. The precise date of foundation is now uncertain. Cotteau published identical text and illustrations almost simultaneously in two different ways:(i) as one (Cotteau, 1855a) of a series of articles on Yonne Jurassic fossil echinoids, published intermittently in the bulletin of the local natural history society over the years 1850-1856 (see Weisbord, 1971 for full hst of articles);(ii) as part of a single monograph (Cotteau, 1855b, in Cotteau, 1849 which provides a comprehensive account of the fossil echinoids of the Yonne Jurassic as then known.3. If they were not simultaneous, presumably the date of publication of (i) preceded that of (ii) rather than vice-versa, but this is now not clear. The only difference between the two is the pagination. Cotteau in later works (1855c; 1873) consistently cited only (ii) without reference to (i), and he has been followed in this by later authors (e.g. Lambert & Thiery, 1909-25;Wagner & Durham, 1966b).4. The precise date of first publication of the name Desoria is not, however, of great significance, for Cotteau quickly (1855c, p. 710) realised that the name Desoria was preoccupied by an insect name (presumably Desoria Nicolet, 1842, as stated by Lambert & Thiery (1909-25) and Wagner & Durham (1966b), although not explicitly stated by Cotteau (1855c)). The name would in any case have been preoccupied by that oi Desoria Gray, 1851 (a spatangoid echinoid, for which the replacement name Protenaster was founded by Pomel (1883)). 5. Cotteau (1855c, p. 710) therefore founded the name Desorella Cotteau, 1855 as a replacement name for Desoria Cotteau, 1855, and Desorella rather than Desoria was given in the table of echinoid genera and species which appeared as an index at the end Species." The Bulletin of zoological nomenclature 44, 27-30.
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