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Perisphinctes (Arisphinctes) trifidus

Cephalopoda - Ammonitida - Perisphinctidae

Taxonomy
Ammonites trifidus was named by Sowerby (1821).

It was recombined as Perisphinctes (Arisphinctes) trifidus by Pandey et al. (2012).

Sister species lacking formal opinion data
Arisphinctes ariprepes, Arisphinctes cotovui, Arisphinctes helenae, 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
Entered
by P. Scofield on 2024-03-23; modified by P. Scofield on 2024-03-23

Synonymy list
YearName and author
1821Ammonites trifidus Sowerby p. 194 figs. Pls. 292, 293
2012Perisphinctes (Arisphinctes) trifidus Pandey et al. p. 506 figs. Pl. XII, figs. 6, 7; Fig. 30; Tab. 17

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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()
subgenusArisphinctes(Buckman 1924)
speciestrifidus()

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 small, evolute, incomplete. Whorl section compressed and rounded to subrectangular (Fig. 30A, B). Feebly arched lanks merge into venter at obtusely rounded ventrolateral shoulder. Maximum thickness of whorl at one-third of lank height. Ornamentation consists of ine, isocostate, prorsiradiate primary ribs, bifurcating regularly at the ventrolateral shoulder (Fig. 30C). Secondaries cross the venter with slight forward-directed convexity. Four constrictions per whorl.