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Statements

Subject Item
n2:RIV%2F00023272%3A_____%2F12%3A%230001975%21RIV13-GA0-00023272
rdf:type
n15:Vysledek skos:Concept
dcterms:description
Sphooceras truncatum (Barrande, 1860), a Silurian straight-shelled cephalopod with a short finger-shaped shell, is one of a few cephalopods in which natural truncation of the apical part of the phragmocone from the rest of the conch is confirmed. Periodic natural removal of the apical part of the shell (4 to 5 phragmocone chambers) preceded formation of a terminal callus and a calcareous plug closing the septal foramen. The apical callus probably originated by fusion of the truncation septum with episeptal deposits. These structures temporarily formed the new apex on which two additional calcareous layers had been secreted. A unique specimen preserves a colour pattern in the convex apical region, which proves that the shell in Sphooceras was temporarily completely surrounded by mantle extending from the body chamber, i.e. the cephalopod was at least temporarily endocochleate. The co-occurrence of different growth stages of S. truncatum together with one type of short juvenile orthoceracone shell, with a maximum of eight phragmocone chambers and a very small subglobular initial chamber indicates that these embryonic shells may belong to Sphooceras. Two other genera are discussed, both previously included in the family Sphooceratidae: Disjunctoceras Gnoli in Kiselev, 1992 and Andigenoceras Gnoli in Kiselev, 1992. The newly discovered thickening of the apex in “Disjunctoceras” disjunctum, the type species of Disjunctoceras, indicates that this species does not differ substantially from Sphooceras and should be reassigned to this genus. Similarly, representatives of Andigenoceras also possess characteristic features of Sphooceras. Sphooceras has many features characteristic for modern cephalopods: short, thin-walled, semi-internal shell; phragmocone reduced to only a few chambers; uncalcified connecting rings; apical callus (a structure analogous to the belemnite rostrum); retractor muscle scars situated dorsally; very small protoconch without cicatrix. Sphooceras truncatum (Barrande, 1860), a Silurian straight-shelled cephalopod with a short finger-shaped shell, is one of a few cephalopods in which natural truncation of the apical part of the phragmocone from the rest of the conch is confirmed. Periodic natural removal of the apical part of the shell (4 to 5 phragmocone chambers) preceded formation of a terminal callus and a calcareous plug closing the septal foramen. The apical callus probably originated by fusion of the truncation septum with episeptal deposits. These structures temporarily formed the new apex on which two additional calcareous layers had been secreted. A unique specimen preserves a colour pattern in the convex apical region, which proves that the shell in Sphooceras was temporarily completely surrounded by mantle extending from the body chamber, i.e. the cephalopod was at least temporarily endocochleate. The co-occurrence of different growth stages of S. truncatum together with one type of short juvenile orthoceracone shell, with a maximum of eight phragmocone chambers and a very small subglobular initial chamber indicates that these embryonic shells may belong to Sphooceras. Two other genera are discussed, both previously included in the family Sphooceratidae: Disjunctoceras Gnoli in Kiselev, 1992 and Andigenoceras Gnoli in Kiselev, 1992. The newly discovered thickening of the apex in “Disjunctoceras” disjunctum, the type species of Disjunctoceras, indicates that this species does not differ substantially from Sphooceras and should be reassigned to this genus. Similarly, representatives of Andigenoceras also possess characteristic features of Sphooceras. Sphooceras has many features characteristic for modern cephalopods: short, thin-walled, semi-internal shell; phragmocone reduced to only a few chambers; uncalcified connecting rings; apical callus (a structure analogous to the belemnite rostrum); retractor muscle scars situated dorsally; very small protoconch without cicatrix.
dcterms:title
%22An endocochleate experiment%22 in the Silurian straight-shelled cephalopod Sphooceras %22An endocochleate experiment%22 in the Silurian straight-shelled cephalopod Sphooceras
skos:prefLabel
%22An endocochleate experiment%22 in the Silurian straight-shelled cephalopod Sphooceras %22An endocochleate experiment%22 in the Silurian straight-shelled cephalopod Sphooceras
skos:notation
RIV/00023272:_____/12:#0001975!RIV13-GA0-00023272
n15:predkladatel
n16:ico%3A00023272
n4:aktivita
n11:P
n4:aktivity
P(GA205/09/0260), P(GA205/09/0703)
n4:cisloPeriodika
4
n4:dodaniDat
n14:2013
n4:domaciTvurceVysledku
n7:1089153
n4:druhVysledku
n13:J
n4:duvernostUdaju
n17:S
n4:entitaPredkladatele
n8:predkladatel
n4:idSjednocenehoVysledku
121945
n4:idVysledku
RIV/00023272:_____/12:#0001975
n4:jazykVysledku
n19:eng
n4:klicovaSlova
Cephalopoda; Angusteradulata; Silurian; shell truncation; colour pattern; mantle extension; internal shell; embryonic shell
n4:klicoveSlovo
n6:colour%20pattern n6:Cephalopoda n6:mantle%20extension n6:Silurian n6:shell%20truncation n6:embryonic%20shell n6:Angusteradulata n6:internal%20shell
n4:kodStatuVydavatele
CZ - Česká republika
n4:kontrolniKodProRIV
[28CE10DEB617]
n4:nazevZdroje
Bulletion of Geosciences
n4:obor
n5:DB
n4:pocetDomacichTvurcuVysledku
1
n4:pocetTvurcuVysledku
2
n4:projekt
n9:GA205%2F09%2F0260 n9:GA205%2F09%2F0703
n4:rokUplatneniVysledku
n14:2012
n4:svazekPeriodika
87
n4:tvurceVysledku
Manda, Štěpán Turek, Vojtěch
n4:wos
000311214100012
s:issn
1214-1119
s:numberOfPages
47
n18:doi
10.3140/bull.geosci.1335