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Species Hypophylloceras (Neophylloceras) hetonaiene Matsumoto 1942

[1]
[2]
[1] Text-fig. 2f-h Ifrim et al. (2004) [2] Text-fig. 3d Ifrim et al. (2004)

Alternative name:
Hypophylloceras hetonaiene Matsumoto 1942
Diagnosis / Definition:
Ifrim et al. (2004):
Description. Shell discoidal and very involute with intermediate expansion rate. The umbilicus is narrow (U/D is approximately 0·07) and has a steep umbilical wall. Flanks are almost subparallel with their maximum breadth above the middle flank. The venter is widely arched. Lirae straight and slightly prorsiradiate on the flanks but slightly retracted ventrolaterally. They are faint in the dorsolateral area. Suture with cornplex incisions and slightly phylloid saddle terminations; the trifid lateral lobe is expanded and surrounded by tetraphylloid saddles. The sutural lobe is slightly retracted.
Discussion / Comments:
Ifrim et al. (2004):
Remarks: Both parallel (e.g. Stinnesbeck 1986) and convergent (e.g. Iones 1963) flanks have been described previously for this species. Thirteen of our tests are crushed, but specimens that are well preserved show little variation in test shape, and all of them have parallel flanks. Hypophylloceras (Neophylloceras) hetonaiense is similar to H. (N) ramosum but differs by having less flexuous lirae. It differs from H. (N) cottreaui (discussed below) owing to its much narrower umbilicus. Occurrence: Hypophylloceras (Neophylloceras) hetonaiense (Matsumoto) is known from the Campanian-Maastrichtian of Japan (Matsumoto 1942), California (Matsumoto 1959b), Antarctica (Spath 1953) and Alaska (Jones 1963), and the Upper Maastrichtian of Chile (Stinnesbeck 1986). Hypophylloceras (Neophylloceras) hetonaiense seems to be a cold water species.
Systematics:

36
 Ordo Ammonoidea
  Subordo Phylloceratina
   Superfamilia Phyllocerataceae
    Familia Phylloceratidae
     Subfamilia Phylloceratinae
      Genus Hypophylloceras
       Subgenus Hypophylloceras (Neophylloceras)
        Species Hypophylloceras (Neophylloceras) hetonaiene
Synonym list:
Ifrim et al. (2004):
? 1895 Phylloceras ramosum Meek. - STEINMANN : p.80 pl. 5, figs. 4a-b
1942 Neophylloceras hetonaiense Matsumoto. - Matsumoto : p.675 figs. 1a3, 1b3
1952 Neophylloceras lambertense Usher. - USHER : p.50 pl. 1, figs. 1-3
? 1953 Neophylloceras hetonaiense Matsumoto. - Spath : p.5 pl. 1, fig. 2
1959 Neophylloceras hetonaiense Matsumoto. - Matsumoto : p.5 pl. 3, fig. 1
1963 Neophylloceras hetonaiense Matsumoto. - JONES : p.23 pl. 6, figs. 9-10; pl. 7, fig. 1; text-fig. 8
1986 Phylloceras (Neophylloceras) hetonaiense Matsumoto. - Stinnesbeck : p.190 pl. 7, figs. 3-4; text-figs. 16b, 17a (with full synonymy)
2004 Hypophylloceras (Neophylloceras) hetonaiene Matsumoto. - Ifrim et al. : 5,7 Text-figs. 2f-h, 3d
Stratigraphy - relative ages:
Campanian - Maastrichtian: Ifrim et al. (2004)
References:

STEINMANN,G.. (1895):
Die Cephalopoden der Quiriquina-Schichten.
In: Neues Jahrbuch für Mineralogie, Geologie undPaläontologie, 1895 p. 64-94

Matsumoto,T.. (1942):
A short note on the Japanese Phylloceratidae . Proceedings of the Imperial Academy Tokyo Vol. 18 p. 674-676

USHER,J.L.. (1952):
Ammonite faunas of the Upper Cretaceous rocks of Vancouver Island . Bulletin of the Geological Survey of Canada Vol. 21 p. 1-182

Spath,L.F.. (1953):
The upper Cretaceous cephalopod fauna of Graham Land . Scientific Reports of the Falkland Islands Survey Department Vol. 3 p. 60

Matsumoto,T.. (1959):
Upper Cretaceous ammonites of California, Part II. . Memoirs of the Faculty of Science, Kyushu University, Series D, Geology, Special Volume Vol. 1 p. 1-172

JONES,D.L.. (1963):
Upper Cretaceous (Campanian and Maastrichtian) ammonites from southern Alaska . United States Geological Survey Professional Paper Vol. 432 p. 1-53

Stinnesbeck,W.. (1986):
Zu den faunistischen und palökologischen Verhältnissen in der Quriquina Formation (Maastrichtium)Zentral-Chiles . Palaeontographica A194((4-6)) p. 99-237

Ifrim,C..; Stinnesbeck,W.. and López-Oliva,J.G.. (2004):
Maastrichtian cephalopods from Cerralvo, north-eastern Mexico . Palaeontology Vol. 47(6) p. 1575–1627
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