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Hoplitoplacenticeras (H.) Howarthi Collignon, 1970 Hoplitoplacenticeras (H.) howarthi Collignon, 1970 (Cephalopoda: Ammonoidea) from KwaZulu-Natal, South Africa and Madagascar; intraspecific variation, dimorphism and affinities Herbert Christian Klinger Natural History Collections Department, lziko South African Museum, P 0 Box 61, Cape Town, 8000 South Africa E-mail hklinger@iziko org za & William James Kennedy Department of Earth Sciences, Oxford University, South Parks Road, Oxford OX1 3AN, UK E-mail• jim kennedy@oum oxacuk (with 15 figures) Received 9 August 2011. Accepted 22 October 2011 Additional specimens of the Campanian ammonite Hoplitoplacenticeras (H.) howarthi Collignon, 1970, as well as examination of Collignon's (1970) Madagascan specimens of Hoplitoplacenticeras allow us to discuss the intraspecific variation, probable dimorphism and affinities of the species. Key words: ammonites, Hoplitoplacenticeras; Upper Campanian, intraspecific variation, dimorphism, affinities, Madagascar, KwaZulu-Natal, South Africa. CONTENTS Abstract · · · · · · · · 41 Systematic palaeontology· · · · · 42 Acknowledgements · · · · · · 45 Introduction · · · · · · · · · · · · · · · · 41 Family Placentlceradd• · · · - · - · · · · - · 42 References · · · · · · · · · · · · · 45 Locality data, repositories Genus Hopllfoplacenrlc818s · · · · · · · · · 42 Figures 1-15 · · 47 and conventions · · · · · · · · · · · · 41 Hopl/toplacentlc818s (H.) howatthl· · · · 42 INTRODUCTION SAlvi: Natural Histoty Collections Department, Iziko South In September 2007 one ofus a-I.C.K) collected several speci­ African Museum, Cape Town. mens of the Campanian ammoniteHoplitoplacenticeras (}{.) GPIB: Institut fur Palaontologie der Rheinischen Friedrich­ howarthi Collignon, 1970 from the Nibela Peninsula in Wilhelms-U niversitat, Bonn. KwaZulu-Natal, South Africa. These specimens add to the GPIG: Geologisch-Palaontologisches Institut und Museum previous description of the species from the same locality by der Georg-August Universitat, Gottingen Klinger & Kennedy (1989), subsurface material from NMB: National Museum, Bloemfontein (on permanent loan Durban (Kennedy & Klinger 1973) and Madagascar to SAlvi) (Collignon 1970). This species is extremely variable as far as UBGD: UFR Sciences de Ia Terre, U niversite de Bourgogne, ornamentation and relative proportions are concerned. We Dijon (Collignon Collection) were able to examine the holotype and other representatives of the subgenus from Madagascar and compare these with SP: Sorbonne Collections, Paris. some of the better-known representatives of the subgenus EMP: Ecole National Superieur des Mines Collections, now from other geographic regions. In addition we can recognize housed in the U niversite de Lyon, Villeurbanne. the probable nature of dimorphism in Hoplitoplacenticeras OUM: Oxford University Museum of Natural Histoty, (H.) howarthi. Oxford. Dimensions are given in millimetres; numbers in brackets LOCALITY DATA, REPOSITORIES AND indicate a percentage of the measured diamete1: D = diame­ CONVENTIONS ter; Wb = whorl breadth, Wh = whorl height, Wb:Wh = Details of localities in KwaZulu-Natal, South Africa are ratio ofwhorl breadth to whorl height; U =umbilical diame­ given in Kennedy & Klinger(1975). tet: Ut and Vt refer to the number of umbilical and ventro­ The following abbreviations are used to indicate the lateral tubercles respectively. Numbers followed by 'x' indi­ repositoty of specimens: cate tubercles per half whorl. 42 African Natural History, Volume 7, 2011 SYSTEMATIC PALAEONTOLOGY Name of the species As first revising authors we select howarthi as the name of Order AMMONOIDEA Zittel, 1884 the species Suborder AMMONITINA Hyatt, 1889 Superfamily HOPLITOIDEA Douvillé, 1890 Type Family PLACENTICERATIDAE Meek, 1876 Holotype by monotypy is the original of Collignon (1970, p. 80, pl. 639, fig. 2351 UBGD12351 (Fig. 8G–I) housed in Genus Hoplitoplacenticeras Paulcke, 1907 the collections of the UFR Sciences de la Terre, Université (ICZN name No. 1348) de Bourgogne, Dijon, from the Upper Campanian of (= Dechenoceras Kayser, 1924) Gisement 227–2, Mokotibe (Antsalova), Madagascar. Subgenus Hoplitoplacenticeras (Hoplitoplacenticeras) Material Paulcke, 1907. SAM-PCZ6586–6587, PCZ7421, 7711, 7719, PCZ18308 (ex NMB-D1314) PCZ18309, PCZ14268, PCZ22138–22145, Type species OUM KX8284–6, all from locality 110, cliff and foreshore Hoplites-Placenticeras plasticus Paulcke, 1907, p. 186, sections at the southwestern tip of the Nibela Peninsula, ICZN Opinion 554, 1959, Name No. 1629). and SAM-PCZ20172, from locality 109F, to the west of the For an extensive review and discussion of the genus former locality in foreshore exposures; both St Lucia Forma- Hoplitoplacenticeras see Kennedy (1986, p. 63) and descrip- tion, Campanian III. A single specimen is from excavations tion of the European, specifically the German representa- at Somtseu Road, Durban in the collections of the Geology tives of the genus see Kaplan et al. (1996, 2005) and Kennedy Department, University of Natal, Mzamba Formation, & Kaplan (1997). Hoplitoplacenticeras differs from other Campanian II? genera referred to the family Placenticeratidae Meek, 1876 (see e.g. Kennedy & Wright 1983 and Klinger & Kennedy Dimensions 1989) mainly by the ontogenetic change in ornament from the phragmocone to the body chamber, especially on Specimen D Wb Wh Wb:Wh U Ut Vt the later part of the latter towards the aperture. The ontogenetic changes include weakening of tubercu- PCZ18309 – 23 28 0.82 lation and ribbing, leaving ultimately a body chamber covered in dense lirae and striae only or with near-effaced PCZ22138 – 24 28 0.86 tubercles. PCZ6587 50 17 25 0.68 13 5 × 2 9 × 2 (34) (50) (26) Hoplitoplacenticeras (Hoplitoplacenticeras) howarthi Collignon, 1970 PCZ20172 64 25 32 0.78 – 4 × 2 10 × 2 Figs 1–6 (39.1) (50) 1931 Hoplites Vari Schlüter; Basse p. 35, pl. 5, figs 1–3; pl. 12, PCZ22139 64 20 23.8 0.84 – 5 × 2 10 × 2 fig. 2; pl. 13, fig. 1. (31.3) (44.2) 1970 Hoplitoplacenticeras marroti Coquand (= H. vari Schlüter); Collignon, p. 75, pl. 638, figs 2342–2343. PCZ7719 67 23 32 0.72 11 –– 1970 Hoplitoplacenticeras sp. aff. marroti Coquand; Collignon, (34.2) (47.8) (16.4) p. 80, pl. 639, fig. 2353. PCZ18308 68 – 28.3 –188 10 × 2 1970 Hoplitoplacenticeras sp. aff. plasticum-crassum Paulcke; (41.6) (26) Collignon, p. 75, pl. 638, fig. 2344; p. 80, pl. 639, fig. 2352. PCZ22141 72 32 34 0.94 – 6 × 2 14 × 2 1970 Hoplitoplacenticeras cf. dolbergense Schlüter; Collig- (44.4) (47.2) non, p. 75, pl. 638, fig. 2345. 1970 Hoplitoplacenticeras cf. costulosum Schlüter; Collignon, PCZ22137 80 32 33 0.97 17.2 9 13 × 2 (40) (41.3) (21.5) p. 76, pl. 638, fig. 2346. ?1970 Hoplitoplacenticeras trangahyense Collignon, p. 76, PCZ14268 80 32.9 36 0.89 20 5 × 2 10 × 2 pl. 638, fig. 2347. (40) (45) (25) 1970 Hoplitoplacenticeras antokazoense Collignon, p. 76, pl. 638, fig. 2348; p. 80, pl. 639, fig. 2354. PCZ22145 – 34 29 1.2 1970 Hoplitoplacenticeras besairiei Collignon, p. 77, pl. 638, PCZ6586 figs 2349–2350. 107 38 51 0.75 24 12 12 × 2 (35.5) (47.7) (22.4) 1970 Hoplitoplacenticeras howarthi Collignon, p. 80, pl. 639, fig. 2351. 1973 Hoplitoplacenticeras plasticum plasticum Paulcke; Description Kennedy & Klinger, p. 102, pl. 5, figs 4a–e. As is the case in the family Placenticeratidae in general, 1989 Hoplitoplacenticeras howarthi Collignon; Klinger & (see e.g. Klinger & Kennedy 1989), but specifically in the Kennedy, p. 358, figs 14b, 108–109. genus Hoplitoplacenticeras, the material is extremely vari- Klinger & Kennedy: Hoplitoplacenticeras (H.) howarthi from South Africa and Madagascar 43 able, both in terms of strength and density of lateral orna- Discussion ment and relative proportions of the shell. This is further complicated by the extreme changes in ornament in the Aperture transition from the phragmocone to the body chamber, as Despite the abundance of specimens available, complete well as the effects of dimorphism. apertures in the genus (and in the family Placenticeratidae) Despite this wide variation in morphology, the following are a rarity. A complete body chamber and aperture were general diagnosis applies to H. (H.) howarthi from KwaZulu- recorded in H. (H.) preyi (Kennedy & Summesberger 1999, Natal: p. 25, pl. 3, figs 1, 4) and another possibly in Hoplito- Narrowly umbilicate, umbilical wall on phragmocone placenticeras (Lemfoerdiceras) lemfoerdense from Poland by near-vertical, whorl section trapezoidal, generally higher Machalski et al. (2004, p. 458, pl. 5, fig. 2). Numerous speci- than wide, ornament consists of prominent, conical umbilical mens of Hoplitoplacenticeras from Germany described by tubercles, connected to bifurcating, prorsiradiate sinusoidal Kaplan et al. (1996) appear to have parts of the aperture pre- ribs with inner and forwardly displaced outer ventro-lateral served in which the shape of the aperture seems to follow tubercles. On body chamber ornament changes, with ribbing that of the growth lines on the body chamber. PCZ22137 becoming closer spaced, less prominent, and weaker. The (Fig. 1A–E) appears to have lateral sinuses and a ventral whorl section becomes more rounded, and the umbilical rostrum. The former, however, are asymmetric on either wall tends to slope outwards. Adult size varies considerably, side, and truncate, rather than follow the general direction probable microconchs and macroconchs can be distin- of the lateral ornament (Fig. 1A,B); the latter (Fig. 1E) also guished, but relative proportions between these overlap appears to truncate the ventral ribbing. Because of this, we considerably.
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