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

 

Normannites egyptiacus Arkell, 1952

( 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

Loc

Normannites egyptiacus Arkell, 1952

Galácz, András 2017
2017
Loc

Normannites cf. braikenridgei

ENAY R. & LE NINDRE Y. M. & MANGOLD C. & MANIVIT J. & VASLET D. 1987: 38
1987
Loc

Spiroceras annulatum

GALACZ A. 1990: 202
ENAY R. & LE NINDRE Y. M. & MANGOLD C. & MANIVIT J. & VASLET D. 1987: 43
DIETL G. 1978: 40
IMLAY R. W. 1970: 1
1978
Loc

Normannites

WESTERMANN G. 1954: 204
1954
Loc

Normannites egyptiacus

PARNES A. 1981: 47
ARKELL W. J. 1952: 309
1952
Loc

Coeloceras braikenridgei

DOUVILLE H. 1916: 28
1916
Loc

Ancyloceras tenue

DOUVILLE H. 1916: 26
1916
Loc

Hamites annulatus

DESHAYES M. G. P. 1831: 228
1831
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