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Hypophylloceras (Neophylloceras) ramosum

Cephalopoda - Phylloceratida - Phylloceratidae

Taxonomy
Ammonites (Scaphites) ramosus was named by Meek (1857). It is not a trace fossil.

It was recombined as Neophylloceras ramosum by Matsumoto (1959) and Henderson (1970); it was recombined as Ammonites (Scaphites) ramosum by Jones (1963) and Matsumoto (1984); it was recombined as Phylloceras (Neophylloceras) ramosum by Henderson and McNamara (1985) and Ward and Kennedy (1993); it was recombined as Hypophylloceras (Neophylloceras) ramosus by Wright et al. (1996); it was recombined as Hypophylloceras (Neophylloceras) ramosum by Salazar et al. (2010).

Sister species lacking formal opinion data

Synonyms
Synonymy list
YearName and author
1857Ammonites (Scaphites) ramosus Meek
1958Phylloceras vaculae Anderson p. 181 figs. Pl 40, figs 3,3a,3b
1958Phylloceras pachecoense Anderson p. 182 figs. Plate 53, figures 1, 1a
1958Phylloceras pachecoensis Anderson p. 182 figs. Pl 53, figs 1,1a
1959Neophylloceras ramosum Matsumoto p. 1 figs. Pl.1, fig. 1a-d; Pl.2, fig.2; Pl. 8, fig.1a-c
1963Ammonites (Scaphites) ramosum Jones p. 22
1970Neophylloceras ramosum Henderson
1984Ammonites (Scaphites) ramosum Matsumoto p. 9
1985Phylloceras (Neophylloceras) ramosum Henderson and McNamara p. 40 figs. Pl 1, figs 1-3; text-fig 3c
1993Phylloceras (Neophylloceras) ramosum Ward and Kennedy p. 15 figs. 17.2, 17.5, 17.6
1996Hypophylloceras (Neophylloceras) ramosus Wright et al. p. 1
2010Hypophylloceras (Neophylloceras) ramosum Salazar et al. p. 184 figs. 3, 4a-d,m

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Spiralia
superphylumLophotrochozoa
phylumMollusca
classCephalopodaCuvier 1797
RankNameAuthor
subclassAmmonoidea()
orderPhylloceratida(Zittel 1884)
superfamilyPhylloceratoidea(Zittel 1884)
familyPhylloceratidaeZittel 1884
subfamilyPhylloceratinaeZittel 1884
genusHypophyllocerasShimizu 1934
subgenusNeophylloceras
speciesramosum(Meek 1857)

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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Invalid names: Phylloceras pachecoense Anderson 1958 [synonym], Phylloceras pachecoensis Anderson 1958 [synonym], Phylloceras vaculae Anderson 1958 [synonym]
Diagnosis
ReferenceDiagnosis
T. Matsumoto 1959The species is characterized by a thin shell, great involution, very small umbilicus (less than 10 percent of the shell diameter), much compressed whorls, narrowly arched venter, rounded umbilical border, nearly parallel, rather than convergent, and only slightly convex flanks, thread-1ike, fine, narrow, and densely spaced subcostae, which incline moderately forward near the umbilicus, bend just below the mid-flank, run almost radially on the rest of the Hanks, and again incline slightly forward near the venter, thus showing flexuosity. Near the umbilical half of the whorl can be seen the very faint, periodic constrictions, which give rise, on the surface of the shell, to low and narrow major ribs. The suture is very complicated, deeply and finely incised and has multipartite saddles, of which the phylloid terminals are indistinct. Minute phylloid terminals, however, are discernible, when the suture is not fully exposed but observed through the semi-transparent, inner layer of the shel1.