Ptychophylloceras (Semisulcatoceras) Joly, 2000

Barroso-Barcenilla, Fernando, Antunes, Miguel Telles, Brandão, José Manuel, Callapez, Pedro Miguel, Santos, Vanda Faria dos & Segura, Manuel, 2018, The d’Orbigny Palaeontological Collection of the National Museum of Natural History and Science, Lisbon, Portugal: Historical perspective and revision of Cretaceous Cephalopoda, Geodiversitas 40 (20), pp. 505-519 : 510

publication ID

https://doi.org/ 10.5252/geodiversitas2018v40a20

publication LSID

urn:lsid:zoobank.org:pub:ED6A1495-51C7-4586-91FF-111E2DBF4267

persistent identifier

https://treatment.plazi.org/id/03D28793-F61B-FFB9-9A95-FA235B29F82D

treatment provided by

Marcus

scientific name

Ptychophylloceras (Semisulcatoceras) Joly, 2000
status

 

Subgenus Ptychophylloceras (Semisulcatoceras) Joly, 2000

Ptychophylloceras (Semisulcatoceras) semisulcatum (d’Orbigny, 1840) ( Fig. 2 View FIG H-J)

MATERIAL. — Two pyritized (and partially limonitized) internal moulds without written or glued indications. Original label: Nº 359/ Ammonites semisulcatus (d’Orb), Andar 17º Neocomiense, Terreno Cretaceo, Localidade Sisteron (Basses Alpes). See Figs 1D; 2K. View FIG

DESCRIPTION

Small-sized, compressed and involute ammonites with subrounded whorl sections. Highly bended and continuous venters and flanks, and narrow umbilici with arched walls. Ornamentation formed by five deep and aborally convex periumbilical constrictions per whorl. Notably complex suture lines with large folds in the external saddles showing a tetraphyllic tendency.

DISCUSSION

The specimen of d’Orbigny (1840: seemingly pl. 53, figs 4-5), originally collected from the Valanginian of Sisteron (Alpesde-Haute-Provence), France, and nowadays held at the MNHN with number MNHN.F.R00489, has been designated by Joly (2000) as the lectotype. The relatively high morphological variability of P. (S.) semisulcatum has allowed the proposal of several subspecies, such as diphyllum (d’Orbigny, 1840), without conspicuous periumbilical constrictions and recently studied in detail by Joly & Mercier (2012). The morphologically closest species is Ptychophylloceras (Semisulcatoceras) ptychoicum (Quenstedt, 1845) , but this Kimmeridgian-lower Berriasian form exhibits conspicuous external varici. In the last years, the Berriasian-Valanginian species P. (S.) semisulcatum , type of the subgenus, has been studied by Joly (1993, 2000), Reboulet (1996), Fischer & Gauthier (2006) and Joly & Mercier (2012), among others.

Suborder AMMONITINA Hyatt, 1889 Family HAPLOCERATIDAE von Zittel, 1884 View in CoL Genus Neolissoceras Spath, 1923 View in CoL

Neolissoceras grasianum (d’Orbigny, 1840) ( Fig. 3 View FIG A-C)

MATERIAL. — Three internal moulds (two of them pyritized) without written or glued indications. Original label: Nº 357/ Ammonites grasanus (d’Orb), Andar 17º Neocomiense, Terreno Cretaceo, Localidade S. t Julien (Hautes Alpes). See Figs 1D; 3D. View FIG

DESCRIPTION

Small-sized, markedly compressed and moderately involute ammonites with subrectangular whorl sections, showing the maximum width at their external part. Slightly arched venter, conspicuous ventrolateral margin, nearly flat and divergent flanks, and wide umbilici with bended walls. Relatively complex suture lines showing a phylloid tendency and with wide saddles, being the first lateral one larger that the ventral. Ornamentation inexistent.

DISCUSSION

This Berriasian-Hauterivian species was firstly reported in Saint-Julien (seemingly, Saint-Julien-en-Beauchêne: Hautes- Alpes), France, by d’Orbigny (1850: 63). As highlighted by Avram & Grädinaru (1993) and Vasicek (2002), the morphologically closest species is Neolissoceras desmoceratoides Wiedmann, 1966 , but this Valanginian form exhibits less compressed section, arched flanks and wider umbilicus with sloping wall. In the last years, N. grasianum , type of the genus, has been studied by some authors, such as Reboulet (1996), Busnardo et al. (2003), Wippich (2003), Ettachfini (2004), Lukeneder (2004), Fischer & Gauthier (2006) and Joly & Mercier (2012).

Kingdom

Animalia

Phylum

Mollusca

Class

Cephalopoda

Order

Ammonoidea

Family

Phylloceratidae

Genus

Ptychophylloceras

Loc

Ptychophylloceras (Semisulcatoceras) Joly, 2000

Barroso-Barcenilla, Fernando, Antunes, Miguel Telles, Brandão, José Manuel, Callapez, Pedro Miguel, Santos, Vanda Faria dos & Segura, Manuel 2018
2018
Loc

Neolissoceras

Spath 1923
1923
Loc

AMMONITINA

Hyatt 1889
1889
Loc

HAPLOCERATIDAE

von Zittel 1884
1884
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