Oecotraustes sp.

Galácz, András, 2017, Bajocian (Middle Jurassic) ammonites of stratigraphical and palaeobiogeographical importance from Mombasa, Kenya, East Africa, Geodiversitas 39 (4), pp. 717-727 : 722

Oecotraustes sp.

( Figs 4A ; 5Q, R )

Hecticoceras sp. juv. – Spath 1920: 359, pl. 5, fig. 7.

(?) Oppeliidae indet [? Oecotraustes ] – Westermann 1975: 40, pl. 2, fig.3.

Oppelia sp. aff. O. subcostata – Galácz 1990: 202.

REMARKS

Half-whorl of a phragmocone showing a narrow, sharp keel and almost smooth flanks. The only discernible sculptural elements are faint, forwardly bent crinkles on the middle of the whorl-sides. The suture-line ( Fig. 4A ) is simple with low saddles and short lobes.

Most of the Bajocian Oecotraustes species have weakly sculptured and keeled nucleus, but closer determination is not possible.

This morphology seems to agree with that figured previously by Spath (1920), then refigured by Westermann (1975).

Figures

FIG. 4. — Suture lines of some important species: A, Oecotraustes sp. MR 1, EMNH.2015.249; B, Cadomites (Cadomites) sp. MR 1, EMNH.2015.232; C,?Diplesioceras sp. MR 1, EMNH.2015.180; D, Spiroceras annulatum (Deshayes, 1831) MR 2, EMNH.2015.287; E, Leptosphinctes cf. schmiereri (Bentz, 1924) MR 2, EMNH.2015.224; F, Nannolytoceras polyhelictum (BÖckh, 1881) MR 2, EMNH.2015.257; G, Trimarginia sp. MR 2, EMNH.2015.279. Scale bar: 5 mm.

FIG. 5. — A, B, Phylloceras trifoliatum Neumayr, 1871 MR 1, EMNH.2015.286; C, D, Phylloceras trifoliatum Neumayr, 1871 MR 2, EMNH.2015.285; E, F, Ptychophylloceras lardyi (Ooster,1860) MR 1, EMNH.2015.303; G, H, Calliphylloceras disputabile (Zittel,1868) MR 1, EMNH.2015.304; I, J, Holcophylloceras zignodianum (d’Orbigny, 1848) MR 1, EMNH.2015.259; K, L, Nannolytoceras polyhelictum (BÖckh,1881) MR 2, EMNH.2015.257;M, N, Trimarginia sp. MR 2, EMNH.2015.279; O, P, Lissoceras oolithicum (d’Orbigny,1845) MR 2, EMNH.2015.268;Q, R, Oecotraustes sp. MR 1, EMNH.2015.249;S,?Diplesioceras sp.MR 1, EMNH.2015.180; T, U, Cadomites (Cadomites) sp. MR 1, EMNH.2015.232; V, W, Normannites egyptiacus Arkell, 1952 MR 2, EMNH.2015.288; X, Y, Spiroceras annulatum (Deshayes, 1831) MR 2, EMNH.2015.287. Scale bar: 10 mm.