Beitrag
Phacoceras oxystomum (Phillips, 1836), an enigmatic Early Carboniferous nautiloid
Korn, Dieter
Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen Band 316 Heft 1 (2025), p. 61 - 67
43 Literaturangaben
veröffentlicht: Nov 14, 2025
Online veröffentlicht: Oct 1, 2025
Manuskript akzeptiert: Sep 5, 2025
Manuskript erhalten: Aug 31, 2025
DOI: 10.1127/njgpa/1285
ArtNo. ESP155031601005, Preis: 29.00 €
Abstract
Phacoceras oxystomum (Phillips, 1836) is, with its extremely discoidal conch and a sharply acute venter, one of the most conspicuous Carboniferous nautiloids. It is re-described here on the basis of a well-preserved specimen from Late Viséan strata of the Rhenish Mountains. The ontogenetic development of the species reveals a rapid transformation from a juvenile stage with morphological features characteristic of the superfamily Subclymenioidea Shimansky, 1962 to the distinct adult stage with an acutely pointed venter. The assignment of the family Phacoceratidae Shimansky, 1962 to this superfamily is therefore supported.
Schlagworte
Nautilida • Phacoceratidae • Carboniferous • Viséan • Rhenish Mountains