Talochlamys fischeri (Zittel, 1865)
ZITTEL, K. A. 1865. Fossile Mollusken und Echinodermen aus Neu-Seeland. In F. von Hochstetter, M. Hörnes & F.R. von Hauer (Eds.), Paläontologie von Neu-Seeland. Reise der Österreichischen Fregatte Novara, Geologischer Theil, 1 (2): 15-68, pls. 6-15. [p. 53, pl. 9, figs. 1c, 2]
1865 Pecten fischeri Zittel, 1865
K. A. Zittel, 1865, plate 9.
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«Char. Testa parva, orbicularis, aequivalvis, radiatim costata. Costae numerosae carinatae inornatae subaequales, interstitiis laevigatis. Auriculae inaequales, striatae.
Höhe 13 Millim., Länge 13 Millim.
Die Schale ist klein, gleichlappig, etwas ungleichseitig, mir zahlreichen einfachen, unverzierten Rippen bedeckt, die in der Mitte stumpf gekielt sind. An den Seiten der Schale schieben sich in die Zwischenräume noch schwache Zwischenrippen von geringer Länge ein. Die Buckeln laufen fast in einem rechten Winkel zusammen und die sehr ungleichen Ohren sind mit wenig erhabenen Rippen versehen. . Name nach Herrn Dr. Fischer in Auckland. Vorkommen: Papakura, Prov. Auckland.» KARL ALFRED ZITTEL, 1865
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«Type material. Pecten fischeri two syntypes NHMW 1959/335/40/1-2. The syntype illustrated on a small rock slab by Zittel (1865, pl. 9, fig. 1c) has not been seen during this revision, so the remaining syntype, NHMW 1995/335/40/1, the separate specimen illustrated by Zittel (1865, pl. 9, fig. 2; Fig. 15D) is here designated the lectotype of Pecten fischeri Zittel, as it is possible that the missing syntype is not conspecific; from locality 2, Hunua Range, Auckland (Otaian, early Miocene). GNS replicas of the lectotype (both TM2801) are a poorer, early plaster cast and an excellent modern plastic replica. The species was named after Dr Carl Frank Fischer of Auckland (Zittel 1865, p. 53).
Dimensions. Lectotype: H 12.3, L 12.2 mm.
Remarks. The lectotype of Talochlamys fischeri is a very small, thin-shelled, finely costate chlamydine with almost all the shell missing, that is, it is largely a natural cast of the left valve exterior, although the right valve is present beneath, in the matrix. It has 43 very narrow, widely spaced radial costae, with some costae intercalated between others in a few interspaces, particularly towards the posterior end of the disc. No microsculpture is preserved. The impressions of the auricles are rather square, that is, with a straight dorsal margin and rather straight, upright anterior and posterior margins, although the anterior auricle is curved forwards and the posterior auricle curves anteriorly, with a concave posterior margin, and the disc is weakly opisthocline. Few characters are visible other than the small size, the weakly opisthocline disc, and the very numerous narrow costae, and additional material from the Waitemata Group near Auckland will be required to clarify the characters and generic position of this species. At present it seems most similar to the Pliocene-living species assigned to Talochlamys by Beu (1995), Beu & Darragh (2001) and Dijkstra & Marshall (2008), but further research on specimens from near Auckland is required to confirm the generic position.
Hutton’s (1873b, p. 30) ‘Oamaru’ specimen assigned to Pecten fischeri (GNS TM4202) is from an unknown locality. It appears to be a juvenile left valve of a Serripecten species with c. 36 smooth radial costae, many fine commarginal ridges between the costae, and five radial costae on each auricle, serrated on the auricles by commarginal ridges. The disc is symmetrical, almost flat, and equidimensional. The genus is uncertain, but it is certainly not congeneric with the lectotype of Talochlamys fischeri. It seems likely that it is a juvenile specimen of the Serripecten (?) n. sp. that occurs in the Deborah Volcanic Formation (as redefined by Edwards & Hornibrook in Edwards 1991, p. 17, fig. 3) in the cliffs below Everett’s (disused) Quarry, Kakanui, south of Oamaru (Whaingaroan, Oligocene).» BEU, A. G., S. NOLDEN & T. A. DARRAGH. 2012. Revision of New Zealand Cenozoic fossil Mollusca described by Zittel (1865) based on Hochstetter’s collections from the Novara Expedition. Memoirs of the Association of Australasian Palaeontologists, 43: 1-69, figs. 1-21. [p. 37]
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Talochlamys (?) fischeri
(Zittel, 1865); A. G. Beu, S. Nolden & T. A. Darragh, 2012, Revision of New Zealand Cenozoic fossil Mollusca described by Zittel (1865) based on Hochstetter’s collections from the Novara Expedition, figure 15D. |