Normannites egyptiacus Arkell, 1952

Galácz, András, 2017, Bajocian (Middle Jurassic) ammonites of stratigraphical and palaeobiogeographical importance from Mombasa, Kenya, East Africa, Geodiversitas 39 (4), pp. 717-727 : 724

publication ID	https://doi.org/ 10.5252/g2017n4a4
publication LSID	urn:lsid:zoobank.org:pub:9D9E8487-1DAB-4B65-B032-6827611BCAE7
persistent identifier	https://treatment.plazi.org/id/03D487BE-FFEC-FFE7-CBFA-D209FA86F911
treatment provided by	Felipe
scientific name	Normannites egyptiacus Arkell, 1952
status

Treatment

( Fig. 5V, W View FIG )

Normannites egyptiacus Arkell, 1952: 309 , pl. 30, fig. 4. — Parnes 1981: 47, pl. 7, figs 27-29.

Coeloceras braikenridgei – Douvillé 1916: 28, pl. 1, figs 11-12.

Normannites ( Normannites ?) aegyptiacus – Westermann 1954: 204, pl. 32, fig. 2.

? Normannites ? sp. – Imlay 1970: D11, pl. 1, figs 9-12.

Normannites cf. braikenridgei ventriplanus Enay et al., 1987a: 38, pl. 2, fig. 6.

Stephanoceratinae gen. et sp. indet. – Galácz 1990: 202.

REMARKS

A single, minute, crushed phragmocone fragment.

The possible presence of Normannites egyptiacus was indicated by Westermann (1975: 46), who reported fragments from the Lower Posidonia shale which could be identified as belonging to this species.

Normannites Munier-Chalmas, 1892 is generally regarded as the microconchiate partner of Skirroceras -like Stephanoceras View in CoL . These present collections did not yield representatives of Skirroceras, but Westermann figured a beautiful macroconch under the name Stephanoceras (Skirroceras) cf. S. macrum (Quenstedt) ( Westermann 1975: pl. 2, fig. 7). This is the specimen identified earlier by Spath (1930: 66) as Stephanoceras View in CoL cf. tenuicostatum Hochstetter, 1898.This specimen likely belongs to a group of Stephanoceras View in CoL which survives into the basal Niortense Zone (e.g. ‘ Cadomites View in CoL ’ humphriesiformis Roché, 1939 [ Roché 1939: pl. 2, figs 3 and 4]).

Normannites egyptiacus is another species which occurs also in Jebel Moghara. It was described by Arkell in 1952 and previously by Douvillé in 1916, on the basis of a specimen which was later re-figured by Westermann (1954: pl. 32, fig.2). Parnes (1981: pl. 7, figs 27-29) figured an ex situ example from the Negev (South Israel) which he placed in a slightly lower horizon.

Leptosphinctes cf. schmiereri ( Bentz, 1924) ( Figs 4E View FIG ; 6D View FIG )

cf. Bigotites schmiereri Bentz, 1924: 181 , pl. 9, fig. 7 (only).

cf. Perisphinctes tenuiplicatus Douvillé, 1916: 23 , pl. 1, fig. 1 (only)

cf. Leptosphinctes ? (L.?) subcoronatus – Pavia 1973: 130, pl.27,fig.4 (only).

cf. Leptosphinctes (Leptosphinctes) schmiereri – Dietl 1980: 10, pl. 1, fig. 2 (only).

cf.? Leptosphinctes (L.) sp. – Parnes 1988: 732, pl. 6, figs 4-5.

REMARKS

The specimen is a fragment of a phragmocone with one side in good preservation.The short and moderately strong inner ribs and the rounded secondaries indicate early, Niortense Zone forms, such as the small-size specimens of L. schmiereri in Dietl (1980: pl. 1, fig. 3), or L. subcoronatus in Pavia (1973: pl. 27, fig. 4). The suture-line ( Fig. 4E View FIG ) with wide, deeply dissected first lateral saddle also indicates Leptosphinctes . A very similar form was figured by Douvillé (1916: pl. 1, fig. 2) from the Upper Bajocian fauna of the Sinai. Arkell (1952: 296, 307) supported the Late Bajocian age of this form in the Jebel Moghara. Parnes (1988) also documented the genus with a very similar form from Moghara.

This is the first record of early, i.e., pre-Callovian perisphinctids from East Africa.

Spiroceras annulatum ( Deshayes, 1831) View in CoL ( Figs 4D View FIG ; 5X, Y View FIG )

Hamites annulatus Deshayes, 1831: 228 , pl. 6, fig. 5.

Ancyloceras tenue View in CoL – Douvillé 1916: 26, pl. 3, figs 10-14.

Spiroceras annulatum View in CoL – Dietl 1978: 40, pl. 6, figs 1-5, pl. 7, figs 1-6, pl. 10, fig. 5, text-figs 6d, 6f, 7c, 8. (cum syn.). — Imlay 1970: 1, D11, figs 7,8. — Enay et al. 1987a: 43, pl. 4, fig. 5. — Galácz 1990: 202.

REMARKS

This is a second heteromorph from the Kambe Limestone. The one described and figured by Westermann (1975: 45, pl. 2, fig. 9) as Spiroceras cf. bifurcati (Quenstedt, 1843) (regarded as S. orbignyi by Dietl [1978: 19]) is certainly different, because he mentioned the characteristic two rows of tubercles on the ribs. That is probably the same specimen what Spath (1933: 815) mentioned as Spiroceras . The here figured example is a short, crushed fragment showing a very slight curve and straight, somewhat prorsiradiate ribs without tubercles.In this respect it is similar to the specimen figured under the same name by Imlay from Arabia ( Imlay 1970: D11, pl. 1, figs 7, 8). The “ Ancyloceras tenue ” specimens from the Sinai figured by Douvillé (1916: pl. 3, figs 10-14) are also close. Parnes (1988: 732) recorded the species also from Gebel Maghara of the Sinai. Most of the well-localized specimens discussed by Dietl (1978) came from the Niortense and some from the Garantiana Zone.

Kingdom	Animalia
Phylum	Mollusca
Class	Cephalopoda
Order	Ammonoidea
Family	Stephanoceratidae
Genus	Normannites