Pharciceras Hyatt, 1884

Korn, Dieter & Bockwinkel, Jürgen, 2021, The pharciceratid ammonoids from the Roteisenstein Formation of Dillenburg (Cephalopoda, Ammonoidea), European Journal of Taxonomy 771, pp. 1-79 : 12-13

Genus Pharciceras Hyatt, 1884

Type species

Goniatites tridens Sandberger & Sandberger, 1850 , subsequently designated by Holzapfel (1889).

Diagnosis

Pharciceratidae with subevolute to evolute juvenile stage, whorl profile strongly to extremely depressed. Adult stage with weakly depressed to weakly compressed whorl profile; venter rounded or tabulate. Juvenile stage sometimes finely ribbed, adult stage with weak to strong, single or paired ventrolateral grooves. Suture line with very wide external lobe, deep or shortened median E 1 lobe, low median saddle, short E 2 lobe, large, midflank lateral lobe, two outer and two inner umbilical lobes. Suture line formula (E 2 E 1 E 2) L U 2 U 4: U 3 U 1 I.

Included species

Goniatites tridens Sandberger & Sandberger, 1850 , Rhenish Mountains; Goniatites amplexus Hall, 1886 , New York State; Pharciceras applanatum Bensaïd, 1974 , Anti-Atlas; Pharciceras barnetti Work, Mason & Klapper, 2007 , Kentucky; Pharciceras bidentatum Petter, 1959 , Anti-Atlas; Pharciceras concurrens Bockwinkel, Becker & Aboussalam, 2017 , Anti-Atlas; Pharciceras darkaouense Bockwinkel, Becker & Ebbighausen, 2009 , Anti-Atlas; Pharciceras decoratum Bockwinkel, Becker & Ebbighausen, 2013 , Anti-Atlas; Pharciceras elevatum Bockwinkel, Becker & Aboussalam, 2017 , Anti- Atlas; Pharciceras fornix Bockwinkel, Becker & Ebbighausen, 2013 , Anti-Atlas; Pharciceras galeatum Wedekind, 1918 , Rhenish Mountains; Pharciceras kayseri Wedekind, 1918 , Rhenish Mountains; Pharciceras involutum Bockwinkel, Becker & Ebbighausen, 2013 ,Anti-Atlas; Prolecanites lateseptatus Frech, 1902 , Montagne Noire; Pharciceras oberscheldense Bockwinkel & Korn in Bockwinkel et al., 2013, Rhenish Mountains; Pharciceras pargai Montesinos & Henn, 1986 , Cantabrian Mountains; Sphaeropharciceras sandbergerorum Bogoslovsky, 1955 , Rhenish Mountains; Pharciceras subconstans Bockwinkel, Becker & Ebbighausen, 2013 , Anti-Atlas; Pharciceras beyrichi sp. nov., Rhenish Mountains; Pharciceras ferrum sp. nov., Rhenish Mountains; Pharciceras kruegeri sp. nov., Rhenish Mountains.

Remarks

The morphological range of the genus Pharciceras has been continuously reduced in the course of time. While Hyatt (1883 –1884) placed the two morphologically quite distant species P. tridens and P. clavilobum in Pharciceras , more and more genera were added. This was done largely on the basis of the different number of elements of the suture line.

Of all genera within the family Pharciceratidae , Pharciceras has the lowest number of lobes (subdivided external lobe, lateral lobe, four umbilical lobes and internal lobe). The genus Extropharciceras , similar in conch form and ornament, differs from Pharciceras in the formation of additional sutural elements and has five or six umbilical lobes.