Coilopoceras Hyatt, 1903
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-F615-FFB5-99DF-FD265D42F9EC |
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scientific name |
Coilopoceras Hyatt, 1903 |
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Genus Coilopoceras Hyatt, 1903 View in CoL
Coilopoceras requienianum (d’Orbigny, 1840) ( Fig. 4A, B View FIG )
MATERIAL. — Two partly silicified internal moulds with glued indications (518). Original label: Nº 518/ Ammonites Requienianus (d’Orb), Andar 21º [corrected] Turoniense, Terreno Cretaceo, Localidade Uchaux (Vanduse) [sic]. See Figs 1D; 4C. View FIG
DESCRIPTION
Medium-sized and involute oxycones, with sublanceolate compressed section, whose maximum width occurs close to the inner third of the flanks. Sharp venter, arched flanks and very narrow umbilici. They have large siphuncle and weak ornamentation, with juvenile whorls showing very tenuous and clavate umbilical tubercles that become feeble and projected falcoid ribs, and adult spires exhibiting smooth surfaces. Suture lines with shallow and dentate external lobes and saddles of similar height, and numerous lateral elements.
DISCUSSION
The specimen of d’Orbigny (1840: pl. 93, figs 1-2), originally collected in Uchaux, and nowadays belonging to the Requien Collection of the MHNA, has been designated by Kennedy & Wright (1984) as the lectotype. This species was firstly reported in Uchaux (Vaucluse), France, by d’Orbigny (1850, p. 189). Cobban & Hook (1980) suggested that many of the forms assigned to the genus Coilopoceras must be considered as mere synonyms of C. requienianum . In their detailed revision of this upper Turonian species, Kennedy & Wright (1984) included Coilopoceras ? grossouvrei Hyatt, 1903, within the wide morphological variability of C. requienianum , and proposed the existence in the same species of sexual dimorphism formed by smooth and ribbed forms. Some other species of Coilopoceras include the type of the genus, C. colleti Hyatt, 1903 , C. springeri Hyatt, 1903 , and C. inflatum Cobban & Hook, 1980 , usually with wider and less deeply incised suture lines. In the last years, C. requienianum has been studied by Meister & Rhalmi (2002), Fischer & Gauthier (2006), Nagm et al. (2010), Ayoub-Hannaa & Fürsich (2012), Nagm & Wilmsen (2012) andRobaszynski et al. (2014), among others.
Suborder ANCYLOCERATINA Wiedmann, 1966 Family TURRILITIDAE Gill, 1871 View in CoL Genus Turrilites Lamarck, 1801 View in CoL Subgenus Turrilites (Turrilites) Lamarck, 1801 View in CoL
Turrilites (Turrilites) costatus Lamarck, 1801 View in CoL ( Fig. 4 View FIG D-E)
MATERIAL. — Four phosphatised internal moulds without written or glued indications. Original label: Nº 466/ Turrilites costatus (Lamarck) , Andar 20º Cenomaniense, Terreno Cretaceo, Localidade Rouen (Seine inf.re). See Figs 1D; 4F. View FIG
DESCRIPTION
Medium-sized turrilitid ammonites with subpoligonal whorl sections. Deeply incised inter-whorl junction and highly acute apical angle. Ornamentation formed by approximately 20 coarse oblique ribs per whorl, located on the exposed face, and obliterated in their lower part by a wide spiral groove. The ribs exhibit a row of strong and elongated tubercles below the groove, and two rows of tenuous tubercles above it. Nearly unobservable suture lines.
DISCUSSION
According to d’Orbigny (1840: 600), specimens of this species, characteristic of the “craie chloritée moyenne”, were collected in Rouen ( France) by him and by Brongniart, Passy, d’Archiac, de Vibraye and Largilliert.This middle Cenomanian heteromorph ammonite, type of the genus, has been recently studied by some authors, such as Wright & Kennedy (1996), Matsumoto & Takahashi (2001), Fischer & Gauthier (2006), Wilmsen & Nagm (2014), Robaszynski et al. (2014) and Meister & Piuz (2015). Some other morphologically close forms of the genus are T. scheuchzerianus Bosc, 1801 , with coarse entire ribs at the later growth stages and lack of tubercles, and T. acutus Passy, 1832 , with more depressed and less ornamented whorls.
Subclass COLEOIDEA Bather, 1888 View in CoL Order BELEMNITIDA von Zittel, 1895 View in CoL Suborder PACHYBELEMNOPSEINA Riegraf in Riegraf, Janssen & Schmitt-Riegraf, 1998 Family Duvaliidae Pavlow, 1914 View in CoL Genus Duvalia Bayle, 1878 View in CoL
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Coilopoceras Hyatt, 1903
Barroso-Barcenilla, Fernando, Antunes, Miguel Telles, Brandão, José Manuel, Callapez, Pedro Miguel, Santos, Vanda Faria dos & Segura, Manuel 2018 |
PACHYBELEMNOPSEINA
Riegraf 1998 |
ANCYLOCERATINA
Wiedmann 1966 |
Duvaliidae
Pavlow 1914 |
BELEMNITIDA
von Zittel 1895 |
COLEOIDEA
Bather 1888 |
Duvalia
Bayle 1878 |
TURRILITIDAE
Gill 1871 |
Turrilites
Lamarck 1801 |
Turrilites (Turrilites)
Lamarck 1801 |
Turrilites (Turrilites) costatus
Lamarck 1801 |