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Perisphinctes (Dichotomosphinctes) tizianiformis

Cephalopoda - Ammonitida - Perisphinctidae

Taxonomy
Perisphinctes tizianiformis was named by Choffat (1893).

It was recombined as Orthosphinctes (Orthosphinctes) tizianiformis by Schlegelmilch (1994); it was recombined as Perisphinctes (Dichotomosphinctes) tizianiformis by Pandey et al. (2012).

Sister species lacking formal opinion data
Dichotomosphinctes bifurcatoides, Dichotomosphinctes decaryi, Dichotomosphinctes elizabethae, Dichotomosphinctes falculae, Dichotomosphinctes martini, Dichotomosphinctes rotoides, Dichotomosphinctes roubyanus, Dichotomosphinctes sikilyensis, Dichotomosphinctes subrota, Dichotomosphinctes wartae, Dichotomosphinctes jacobi, P. acer, P. africanus, P. albertinus, P. andelotensis, P. andium, P. breviceps, P. colubrinus, P. contiguus, P. dorae, P. effrenatus, P. ernesti, P. gottschei, P. indogermanicus, P. koeneni, P. mairei-matheyi, P. malinowskae, P. orientalis, P. panderi, P. planula, P. polygyratus, P. praestenocyclus, P. progeron, P. quadratus, P. scythicus, P. siemiradzkii, P. siliceus, P. sutneri, P. torquatus, P. transatlanticus, P. trichoplocus, P. vandellii, P. alligatus, P. latilinguatus, P. eucostatus, P. quadratus, P. cotovui, P. helenae, P. maximus, P. pickeringius, P. borealis, P. multicostatus, P. dichotomus, P. duongi, P. arkelli, P. buckmani, P. buckmanni, P. dobrogensis, P. elizabethae, P. episcopalis, P. laisinensis, P. luciae, P. luciaeformis, P. lucieformis, P. marnesiae, P. ouatius, P. rotoides, P. trichoplocus, P. wartaeformis, P. chirchonensis, P. balderus, P. crassissimus, P. cyrilli, P. kranaus, P. prosmiscuus, P. sayni, P. A, P. B, P. laevipickeringius, P. anguinus, P. monteiroi, P. spathi, P. aguilonensis, P. anguiculus, P. arkelli, P. crotalinus, P. nectobrigensis, P. patturatensis, P. paturratensis, P. pulvinus, P. siemirazkii, P. roedereri, P. alatus, P. andelotensis, P. boweni, P. cautisnigrae, P. cuneicostatus, P. densecostatus, P. panthieri, P. pumilus, P. strumatus, P. uptonensis, P. perplanatus, P. kreutzi, P. dorsoplanus, P. dacquei, P. polygyratus

Synonymy list
YearName and author
1893Perisphinctes tizianiformis Choffat p. 19 figs. Pl. 3, figs 1-4
1994Orthosphinctes (Orthosphinctes) tizianiformis Schlegelmilch p. 65 figs. Pl 22, fig 4
2012Perisphinctes (Dichotomosphinctes) tizianiformis Pandey et al. p. 519

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Protostomia
—Spiralia
superphylumLophotrochozoa
phylumMollusca
classCephalopodaCuvier 1797
subclassAmmonoidea()
RankNameAuthor
orderAmmonitidaHaeckel 1866
suborderAmmonitinaHyatt 1889
superfamilyPerisphinctoidea(Steinman 1890)
familyPerisphinctidaeSteinmann 1890
subfamilyPerisphinctinaeSteinmann 1890
genusPerisphinctes()
subgenusDichotomosphinctes
speciestizianiformis(Choffat 1893)

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

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Diagnosis
ReferenceDiagnosis
D.K. Pandey et al. 2012Shells moderately large, evolute, compressed, complete with small lappets (Fig. 50C). Whorl section oval in outline with slightly arched lanks, which merge into the rounded venter (Fig. 50B). Ornamentation consists of isocostate, sharp, prorsiradiate primary ribs, which branch into two or, more rarely, three secondaries at the ventrolateral region and cross the venter with slight forward-directed convexity (Fig. Fig. 50: A. Perisphinctes (Dichotomosphinctes) cf. tizianiformis ChoFFat, 1893; Dhosa Conglomerate Bed, Jara Dome; GZN2009II 206. Whorl section at unknown diameter. B-C. Perisphinctes (Dichotomosphinctes) tizianiformis ChoFFat, 1893; Kantkote Ammonite Beds, Tramau River. B. Whorl section at ca. 43 mm diameter; GZN2010I 243. C. Ribbing pattern on right lank at ca. 105 mm diameter; GZN2010I 149. 50C). Rarely, isolated secondary ribs occur, giving the appearance of trifurcation or polygyrate ornamentation. Ribs on outer whorl moderately sharp. Constrictions at least three on outer whorl, in addition to a broader constriction just before the aperture. Umbilical wall distinct, smooth, and with undercut.
Measurements
No measurements are available
Composition: aragoniteo
Environment: marinec
Locomotion: fast-movingo
Life habit: nektonico
Diet: carnivoreo
Vision: well-developedc
Created: 2005-01-28 02:27:03
Modified: 2009-10-08 14:14:55
Source: o = order, c = class
References: Kiessling 2004, Kiessling 2003
Collections
No collection or age range data are available