Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum

—~)

| Vol of

QE

MARCH 1976 ISSN 0303-2515

V

Por ih

INSTRUCTIONS TO AUTHORS

1. MATERIAL should be original and not published elsewhere, in whole or in part. When
accepted, copyright becomes the property of the Trustees of the South African Museum.

2. LAYOUT should be as follows:

(a) Masthead to consist of
Title: informative but concise, without abbreviations and not including the names of new genera or species
Author’s(s’) name(s)
Address(es) of author(s) (institution where work was carried out)
Number of illustrations (figures, enumerated maps and tables, in this order)
(b) Abstract of not more than 200 words, intelligible to the reader without reference to the text
(c) Table of contents giving hierarchy of headings and subheadings
(d) Introduction
(e) Subject-matter of the paper, divided into sections to correspond with those given in table of contents
(f) Summary, if paper is lengthy
(g) Acknowledgements
(h) References
(i) Abbreviations, where these are numerous

3. MANUSCRIPT, to be submitted in triplicate, should be typewritten, double spaced with
2,5 cm margins all round. Tables and legends for illustrations should be typed separately,
their positions indicated in the text. All pages should be numbered consecutively.

Major headings of the paper are centred capitals; first subheadings are shouldered small
capitals; second subheadings are shouldered italics; third subheadings are indented, shouldered
italics. Further subdivisions should be avoided, as also enumeration (never roman numerals)
of headings and abbreviations.

Only generic and specific names should be underlined to indicate italics; all other marking
up should be left to editor and publisher.

4. ILLUSTRATIONS should be reducible to a size not exceeding 12 « 18 cm (19 cm including
legend); originals larger than 35 x 47 cm should not be submitted; photographs should be
final size. A metric scale should appear with all illustrations, otherwise magnification or reduc-
tion should be given in the legend.

All illustrations, whether line drawings or photographs, should be termed figures (plates
are not printed; half-tones will appear in their proper place in the text) and numbered in a
single series. Items of composite figures should be designated by capital letters; lettering of
figures is not set in type and should be in lower-case letters.

The number of the figure should be marked on the back of each illustration.

5. REFERENCES cited in text and synonymies should all be included in the list at the end of
the paper, using the Harvard System (ibid., idem., loc. cit., op. cit. are not acceptable):

(a) Author’s name and year of publication given in text, e.g.:

‘Smith (1969) describes .. .”
‘Smith (1969: 36, fig. 16) describes...’
‘As described (Smith 1969a, 19696; Jones 1971)...
“As described (Haughton & Broom 1927)...’
“As described (Haughton et al. 1927)...’
Note: no comma separating name and year
pagination indicated by colon, not p.
names of joint authors connected by ampersand
et al. in text for more than two joint authors, but names of all authors given in list of references

(b) Full references at the end of the paper, arranged alphabetically by names, chronologically
within each name, with suffixes a, b, etc. to the year for more than one paper by the same
author in that year, e.g. Smith (1969a, 1969b) and not Smith (1969, 1969a).

For books give title in italics, edition, volume number, place of publication, publisher.

For journal article give title of article, title of journal in italics (abbreviated according to the World list of
scientific periodicals. 4th ed. London: Butterworths, 1963), series in parentheses, volume number, part
number (only if independently paged) in parentheses, pagination (first and last pages of article).

Examples (note capitalization and punctuation)

BULLOUGH, W. S. 1960. Practical invertebrate anatomy. 2nd ed. London: Macmillan.

FIsCHER, P.-H. 1948. Données sur la résistance et de le vitalité des mollusques. —J. Conch., Paris 88: 100-140.

FiscHER, P.-H., DuvaL, M. & RaArFry, A. 1933. Etudes sur les échanges respiratoires des littorines. — Archs
Zool. exp. gén. 74: 627-634.

Konn, A. J. 1960a. Ecological notes on Conus (Mollusca: Gastropoda) in the Trincomalee region of Ceylon. —
Ann. Mag. nat. Hist. (13) 2: 309-320.

Koun, A. J. 19606. Spawning behaviour, egg masses and larval development in Conus from the Indian Ocean. —
Bull. Bingham oceanogr. Coll. 17 (4): 1-51.

THIELE, J. 1910. Mollusca: B. Polyplacophora, Gastropoda marina, Bivalvia. In: SCHULTZE, L. Zoologische
und anthropologische Ergebnisse einer Forschungsreise im westlichen und zentralen Siid-Afrika 4: 269-270.
Jena: Fischer.— Denkschr. med.-naturw. Ges. Jena 16: 269-270.

(continued inside back cover)

ANNALS OF THE SOUTH AFRICAN MUSEUM
ANNALE VAN DIE SUID-AFRIKAANSE MUSEUM

Volume 69 Band
March 1976 Maart
Part 7 Deel

YABEICERAS (CONIACIAN AMMONITE) FROM THE
ALPHARD GROUP OFF THE SOUTHERN
CAPE COAST

By

EC. KEINGER, W: J: KENNEDY & WW. G: SIESSER

Cape Town Kaapstad

The ANNALS OF THE SOUTH AFRICAN MUSEUM

are issued in parts at irregular intervals as material
becomes available

Obtainable from the South African Museum, P.O. Box 61, Cape Town 8000

Die ANNALE VAN DIE SUID-AFRIKAANSE MUSEUM

word uitgegee in dele op ongereelde tye na beskikbaarheid
van stof

Verkrygbaar van die Suid-Afrikaanse Museum, Posbus 61, Kaapstad 8000

OUT OF PRINT/UIT DRUK

1, 2(1, 3, 5-8), 3(1-2, 4-5, t.-p.i.), 5(1-3, 5, 7-9),
6(1, t.—p.i.), 711-4), 8, 9(1-2), 10(1),
11(1-2, 5, 7, t.-p.i.), 15(5), 24(2), 27, 3101-3), 33

Price of this part/Prys van hierdie deel
R1,70

Trustees of the South African Museum © Trustees van die Suid-Afrikaanse Museum
1976

ISBN 0 949940 84 4

Printed in South Africa by In Suid-Afrika gedruk deur
The Rustica Press, Pty., Ltd., Die Rustica-pers, Edms., Bpk.,
Court Road, Wynberg, Cape Courtweg, Wynberg, Kaap

YABEICERAS (CONIACIAN AMMONITE) FROM THE ALPHARD
GROUP OFF THE SOUTHERN CAPE COAST

By

H. C. KLINGER
South African Museum, Cape Town

W. J. KENNEDY
Department of Geology and Mineralogy, Oxford University

&

W. G. SIESSER
Marine Geoscience Unit, University of Cape Town

(With 4 figures)
LMS accepted 30 October 1975]

ABSTRACT

During dredging operations off the southern Cape coast a bored concretion containing
a specimen of the ammonite Yabeiceras manasoaense Collignon was recovered. The species
had been previously recorded only from the Coniacian of Madagascar and Japan; the occur-
rence extends the geographic range of the species and provides reliable dating for the out-
cropping offshore Mesozoic Alphard Group of sediments of the area.

CONTENTS

PAGE
Introduction . ; ; : 161
Material ; : A : 161
Systematic Palaeontology SIOZ
Acknowledgements : ; 167
References. : : F 167

INTRODUCTION

During dredging operations off the southern Cape coast, undertaken by
the Marine Geoscience Unit of the University of Cape Town, a concretion
containing an ammonite was brought to the surface at 35.06S, 20.32E from a
depth of 110 metres. The specimen was identified as belonging to the genus
Yabeiceras, thus far only described from the Coniacian stage of the Upper
Cretaceous of Madagascar and Japan. Apart from adding to our knowledge
of the geographical distribution of the genus, this record permits a precise
dating of the offshore Alphard Group of sediments in the area. The only other
recorded Mesozoic ammonite from the South African offshore is an Eubaculites
sp. recorded by Dingle (1973: 10), although occurrences of Tertiary nautiloids
were reported by Cayeux (1934) and Miller & Furnish (1956).

MATERIAL

The concretion containing the ammonite consists of a dark greyish-green,
fine-grained quartz siltstone, with a calcite cement. The ammonite itself is

161

Ann. S. Afr. Mus. 69 (7), 1976: 161-168, 4 figs.

162 ANNALS OF THE SOUTH AFRICAN MUSEUM

partially filled with sparry calcite, but the greater part is preserved as an internal
mould, consisting of the same material as the concretion. Part of the original
aragonitic shell has been preserved.

That part of the concretion and the ammonite which was exposed at the
sediment/water interface is pitted with two types of borings of Recent orga-
nisms. The first consists of large (up to | cm in diameter) flask-like crypts,
internally smooth, with a constricted aperture. The second is much smaller,
2 to 3 mm across and irregular in habit. Both types of borings show cross-
cutting relationships. The larger may be ascribed to lithodomous bivalves,
the smaller to polychaete worms, and perhaps other organisms. Apart from
a few encrusting ectoprocts (bryozoans) and serpulids, most of which occur
within the borings, no other epizoans are present.

SYSTEMATIC PALAEONTOLOGY

Family Collignoniceratidae Wright & Wright, 1951
Subfamily Barroisiceratinae Basse, 1947

Genus Yabeiceras Tokunaga & Shimizu, 1926
(= Eboroceras Basse, 1947)

Type species
Yabeiceras orientale Tokunaga & Shimizu, 1926 by original designation.

Discussion

Matsumoto et al. (1964; Matsumoto 1969) have provided recent reviews
of Yabeiceras and demonstrated that it should be referred to the Barroisi-
ceratinae rather than to the Peroniceratinae, as in the current Treatise (Wright
1957: L429).

Yabeiceras is an uncommon genus represented by four species in Japan:
Y. orientale Tokunaga & Shimizu, Y. kotoi Tokunaga & Shimizu, Y. himuroi
Tokunaga & Shimizu, and Y. manasoaense Collignon, whilst Basse (1946) and
Collignon (1965) record six species from Madagascar: Y. magnumtuberculatum
Basse, Y. manasoaense Collignon, Y. menabense Collignon, Y. costatum Col-
lignon and Y. ankinatsyense Collignon. Undescribed species also occur in
Zululand (Kennedy & Klinger 1975). All records of Yabeiceras are of either
Lower or Middle Coniacian age.

Yabeiceras manasoaense Collignon, 1965
Figs 1-4

Yabeiceras manasoaense Collignon, 1965: 84, pl. 452 (fig. 1839).
Matsumoto 1971: 144, pl. 24 (55) (fig. 2), text-fig. 9 (110).

Holotype

The specimen figures by Collignon (1965, pl. 452 (fig. 1839)) from the
Coniacian of Manasoa (Betioky), Madagascar.

YABEICERAS (CONIACIAN AMMONITE) OFF THE SOUTHERN CAPE COAST 163

Fig. 1. Yabeiceras manasoaense specimen 4492 left lateral view x 1.

Material

Sample 4492 from the Alphard Group at 35.06S, 20.32E, and housed
with the Marine Geoscience Unit, University of Cape Town collections.

Description

The specimen comprises just over two whorls of phragmocone and an
incomplete body chamber of slightly more than a third of a whorl. The inner-
most whorls up to a diameter of 10 mm are not preserved. Coiling is very
evolute with an umbilical diameter of 54,6 per cent of the total diameter. The
outer whorls embrace only slightly, covering less than 10 per cent of the previous

164 ANNALS OF THE SOUTH AFRICAN MUSEUM

Fig. 2. Yabeiceras manasoaense specimen 4492 right lateral view x 1.

whorl. The whorl section of the body chamber is coronate, with maximum
breadth across the dorsal third of the flanks. The venter is ornamented by a
low broad keel, bounded on either side by two equally broad depressions, in
turn flanked by low lateral keels.

Flank ornament consists of a single row of tubercles numbering sixteen
on the outer whorl. On the inner whorls the tubercles are conical to pointed,
and are housed in notches in the umbilical wall of the succeeding whorl. With
increasing diameter the tubercles become more bullate and migrate progressively
from the umbilical suture towards the midflank, and eventually to the dorsal
third of the flanks. Ornament declines markedly on the body chamber.

YABEICERAS (CONIACIAN AMMONITE) OFF THE SOUTHERN CAPE COAST 165

B

Fig. 3. Yabeiceras manasoaense specimen 4492. A. Ventral view < 1.
B. Dorsal view x 1.

166 ANNALS OF THE SOUTH AFRICAN MUSEUM

Fig. 4. External suture line of Yabeiceras manasoaense Collignon, specimen 4492 at whorl
breadth of 30 mm x 3.

Dimensions

Specimen D Wb Wh Wb/Wh U
AAO Die ets lgak Mane ame es 92,5 34(36,9) DIES (25-2) peleo 50,5(54,6)
Holotype oo ean eee MOS By TK(B}5))) 24(23) 5 51(49)
(Collignon 1965)

Matsumoto 1971 ca er 49 38,6(26) 43,2(29) 0,9 72,4(48)

(Muramoto coll. Ob-S-6-p1)

Discussion

Differences between the nine described species of Yabeiceras are slight,
and well within the range of variation documented in related ammonite groups.
Study of large populations will probably show that most of the described
forms are variants of one or two variable species. Available material is inade-
quate for any constructive discussion of this point, however. The present
specimen compares most closely with Yabeiceras manasoaense, showing a
similar whorl section and ornament which declines on the outer whorls. Dimen-
sions are closely similar to that of the holotype. The larger specimen figured
and described by Matsumoto (1971: 144, pl. 24 (fig. 2)) is virtually identical
at similar diameters, and shows further development of the declining ornament
seen on the body chamber of our specimen.

Yabeiceras bituberculatum Collignon (1965: 821, pl. 451 (fig. 1836), pl. 452
(fig. 1838)) is readily distinguished on the basis of the presence of ventral
tubercles when young, whilst Collignon’s figure shows what appears to be a

YABEICERAS (CONIACIAN AMMONITE) OFF THE SOUTHERN CAPE COAST 167

siphonal row of elongate clavi rather than a continuous keel at this diameter,
whilst the adult body chamber is remarkably smooth and constricted.

Yabeiceras magnumbilicatum (Basse) (1946: 73, fig. 2, pl. 2 (figs 2a—b);
Collignon 1965: 82, pl. 451 (fig. 1836)) has larger, coarser umbilical nodes, a
contracted, virtually smooth body chamber, and far more involute coiling
(U = 35 per cent of diameter).

Y. costatum Collignon (1965: 87, pl. 454 (fig. 1841)) is a costate, rather
than tuberculate species, with 26-28 ribs per whorl, as is Y. ankinatsyense
Collignon (1965: 87, pl. 454 (fig. 1842)).

Y. menabense Collignon (1965: 86, pl. 453 (fig. 1840)) is characterized by
a very depressed whorl section, evolute coiling and 12-15 massive tubercles
per whorl.

Y. magnumbilicatum, Y. bituberculatum and Y. manasoaense are contempo-
raries, as are Y. menabense, Y. costatum and Y. ankinatsyense. It is difficult to
see these as more than one, or perhaps two species, whilst the Y. costatum
group is scarcely distinguishable from the type species, Y. orientale or the
costate Y. himuroi and Y. kotoi (Tokunaga & Shimizu 1926).

Occurrence:

Y. mansoaense is recorded from the Lower to Middle Coniacian of Japan
and the Middle Coniacian Kossmaticeras theobaldianum/Barroisiceras onila-
hyense Zone of Madagascar. In Zululand related, but as yet undescribed, forms
occur in the St. Lucia Formation in the second division of the Coniacian,
associated with Forresteria alluaudi (Boule, Lemoine & Thevenin), Proplacen-
ticeras spp. and other forms, again suggesting an early Coniacian age.

ACKNOWLEDGEMENTS

We should like to express our thanks to the Marine Geoscience Unit for
placing the material and data at our disposal. Thanks are due to Mr Neville
Eden for the photography.

REFERENCES

Basse, E. 1946. Sur deux ammonites nouvelles du Coniacien du Sud-ouest de Madagascar:
Subbarroisiceras n.g. mahafalense n. sp. et Eboroceras n.g. magnumbilicatum n. sp.—
Bull. Soc. géol. Fr., 5 ser, 16: 71-76, pl. 2.

Basse, E. 1947. Les peuplements malgachés de Barroisiceras.—Ann. Paléont. 33: 99-178,
pl. 1(7)-9(15).

Cayveux, L. 1934. The phosphatic nodules of the Agulhas Bank.—Ann. S. Afr. Mus. 31:
105-135, pls 32-35.

COLLIGNON, M. 1965. Atlas des fossiles caracteristiques de Madagascar (Ammonites). 13
(Coniacien). Tananarive: Service Geologique.

DINGLE, R. V. 1973. Post-Palaeozoic stratigraphy of the eastern Agulhas Bank, South African
continental margin. — Mar. Geol. 15: 1-23.

KENNEDY, W. J. & KLINGER, H. C. 1975. Cretaceous faunas from Zululand and Natal, South
Africa. Introduction, stratigraphy.— Bull. Br. Mus. nat. Hist. (Geol.) 25: 265-315.

168 ANNALS OF THE SOUTH AFRICAN MUSEUM

Matsumoto, T. 1969. A Monograph of the Collignoniceratidae from Hokkaido. Part III.
(Studies of the Cretaceous Ammonites from Hokkaido and Saghalien—xx.)— Mem. Fac.
Sci. Kyushu Univ. (D) 19: 297-330.

Matsumoto, T. 1971. A Monograph of the Collignoniceratidae from Japan. Part V. (Studies
of the Cretaceous Ammonites from Hokkaido and Saghalien—xxili.)— Mem. Fac. Sci.
Kyushu Univ. (D) 21: 129-162.

Matsumoto, T., OBATA, I., MAEDA, S. & SATo, T. 1964. Yabeiceras (Cretaceous ammonites)
from Futaba, Northeast Japan.— Trans. Proc. palaeont. Soc. Japan (N.s.) 55: 322-331.

Miiier, A. K. & FurNisH, W. M. 1956. Tertiary Nautiloids dredged near Cape of Good
Hope. — Ann. S. Afr. Mus. 42: 327-328.

TOKUNAGA, S. & SHimizu, S. 1926. The Cretaceous Formation of Futaba in Iwaki and its
fossils. —J. Fac. Sci. Tokyo Univ. (2) 1: 181-212.

WRIGHT, C. W. 1957. In R. C. Moore ed. Treatise on invertebrate paleontology Pt 1, Mollusca,
Cephalopoda, Ammonoidea. Lawrence: University of Kansas Press.

WRIGHT, C. W. & WriGut, E. V. 1951. A survey of the cephalopoda of the Chalk of Great
Britain. London: Palaeontographical Society.

6. SYSTEMATIC papers must conform with the International code of zoological nomenclature
(particularly Articles 22 and 51).

Names of new taxa, combinations, synonyms, etc., when used for the first time, must be
followed by the appropriate Latin (not English) abbreviation, e.g. gen. n., sp. n., comb. n.,
syn. n., etc.

: An author’s name when cited must follow the name of the taxon without intervening
punctuation and not be abbreviated; if the year is added, a comma must separate author’s
name and year. The author’s name (and date, if cited) must be placed in parentheses if a
species or subspecies is transferred from its original genus. The name of a subsequent user of
a scientific name must be separated from the scientific name by a colon.

Synonymy arrangement should be according to chronology of names, i.e. all published
scientific names by which the species previously has been designated are listed in chronological
order, with all references to that name following in chronological order, e.g.:

Family Nuculanidae
Nuculana (Lembulus) bicuspidata (Gould, 1845)

Figs 14-15A
Nucula (Leda) bicuspidata Gould, 1845: 37.
Leda plicifera A. Adams, 1856: 50.
Laeda bicuspidata Hanley, 1859: 118, pl. 228 (fig. 73). Sowerby, 1871: pl. 2 (figs 8a—b).
Nucula largillierti Philippi, 1861: 87
Leda bicuspidata: Nicklés, 1950: 163, fig. 301; 1955: 110. Barnard, 1964: 234, figs 8-9.

Note punctuation in the above example:
comma separates author’s name and year
semicolon separates more than one reference by the same author
full stop separates references by different authors
figures of plates are enclosed in parentheses to distinguish them from text-figures
dash, not comma, separates consecutive numbers

Synonymy arrangement according to chronology of bibliographic references, whereby
the year is placed in front of each entry, and the synonym repeated in full for each entry, is
not acceptable.

In describing new species, one specimen must be designated as the holotype; other speci-
mens mentioned in the original description are to be designated paratypes; additional material
not regarded as paratypes should be listed separately. The complete data (registration number,
depository, description of specimen, locality, collector, date) of the holotype and paratypes
must be recorded, e.g.:

Holotype
SAM-—A13535 in the South African Museum, Cape Town. Adult female from mid-tide region, King’s Beach,
Port Elizabeth (33.51S, 25.39E), collected by A. Smith, 15 January 1973.

Note standard form of writing South African Museum registration numbers and of date.

7. SPECIAL HOUSE RULES

Capital initial letters

(a) The Figures, Maps and Tables of the paper when referred to in the text
e.g. *... the Figure depicting C. namacolus...
*...1n C. namacolus (Fig. 10)...’

(b) The prefixes of prefixed surnames in all languages, when used in the text, if not preceded
by initials or full names
e.g. Du Toit but A. L. du Toit
Von Huene but F. von Huene

(c) Scientific names, but not their vernacular derivatives
e.g. Therocephalia, but therocephalian

Punctuation should be loose, omitting all not strictly necessary

Reference to the author should be expressed in the third person

Roman numerals should be converted to arabic, except when forming part of the title of a
book or article, such as
‘Revision of the Crustacea. Part VIII. The Amphipoda.’

Specific name must not stand alone, but be preceded by the generic name or its abbreviation
to initial capital letter, provided the same generic name is used consecutively.

“iN
3 9088 01206 6346

H. C. KLINGER, W. J. KENNEDY & W. G. SIBSSER

YABEICERAS (CONIACIAN AMMONITE) FROM
THE ALPHARD GROUP OFF THE
SOUTHERN CAPE COAST