|Phormocyrtis fastosa (Ehrenberg) Haeckel or Pterocorys hertwigii (Haeckel)?|
Richard N. Benson (28/05/2004)
|Benson (1966) placed Eucyrtidium hertwigii Haeckel in queried synonymy with Phormocyrtis fastuosa [sic.] (Ehrenberg) Haeckel because it differs from the latter only in the presence of two abdominal joints, a feature that may be subject to intraspecific variation. It was his opinion, therefore, that Ehrenberg’s species has priority.|
Nigrini (1967) noted Haeckel’s (1887) description of E. hertwigii as four-segmented, but from her examination of topotypic material she determined that the taxon is always three-segmented and placed it in the genus Theoconus. Caulet and Nigrini (1988) were unable to determine the correct taxonomic position of Eucyrtidium fatuosum Ehrenberg; therefore, they did not consider it synonymous with P. hertwigii. See additional synonymy in their publication.