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Lamellorthoceratid Cephalopods in the Cold Waters of Southwestern Gondwana: Evidences from the Lower Devonian of Argentina

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Lamellorthoceratid Cephalopods in the Cold Waters of Southwestern Gondwana: Evidences from the Lower Devonian of Argentina Lamellorthoceratid cephalopods in the cold waters of southwestern Gondwana: Evidences from the Lower Devonian of Argentina MARCELA CICHOWOLSKI and JUAN JOSÉ RUSTÁN Cichowolski, M. and Rustán, J.J. 2020. Lamellorthoceratid cephalopods in the cold waters of southwestern Gondwana: Evidences from the Lower Devonian of Argentina. Acta Palaeontologica Polonica 65 (2): 305–312. Based on three specimens assigned to Arthrophyllum sp., the family Lamellorthoceratidae is reported from the Lower Devonian Talacasto Formation in the Precordillera Basin, central western Argentina. These Devonian cephalopods have been known only from low to mid palaeolatitudes and its presence in the cold water settings of southwestern Gondwana is notable. A nektonic mode of life, not strictly demersal but eventually pelagic, with a horizontal orientation of the conch is proposed for adults lamellorthoceratids, whereas a planktonic habit is suggested for juvenile individuals. These features would had allow their arrival to this southern basin, explaining their unusual presence in the Malvinokaffric Realm, and reinforcing the need of re-evaluate the distribution pattern of several groups of cephalopods. Key words: Cephalopoda, Lamellorthoceratidae, Arthrophyllum, Palaeozoic, Talacasto Formation, Malvinokaffric Realm, Precordillera Basin, Argentina. Marcela Cichowolski [[email protected]], Instituto de Estudios Andinos “Don Pablo Groeber” (IDEAN), CON- ICET, and Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pab. 2, C1428EGA, Buenos Aires, Argentina. Juan J. Rustán [[email protected]], Centro de Investigaciones en Ciencias de la Tierra (CICTERRA), Centro de Investigaciones Paleobiológicas (CIPAL), CONICET, Universidad Nacional de Córdoba, Av. Vélez Sarsfield Nº 1611, X5016GCA, Córdoba, Argentina and Universidad Nacional de La Rioja, M. de la Fuente s/n, CP 5300, La Rioja, Argentina. Received 1 November 2019, accepted 3 January 2020, available online 2 April 2020. Copyright © 2020 M. Cichowolski and J.J. Rustán. This is an open-access article distributed under the terms of the Creative Commons Attribution License (for details please see http://creativecommons.org/licenses/by/4.0/), which per- mits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. By contrast, the cold water settings of the Early to Introduction Middle Devonian austral circumpolar region known as the Malvinokaffric Realm (Richter and Richter 1942) The family Lamellorthoceratidae Teichert, 1961 is a small group of Early to Middle Devonian non-ammonoid cephalo- was claimed to have an extremely poor cephalopod re- pods possessing orthoconic shells characterized by abundant cord (Boucot and Racheboeuf 1993). This major Devonian cameral deposits composed of more or less closely spaced paleobiogeographic unit corresponds to southwestern sets of radial lamellae. They have been exclusively known, Gondwanan marine basins and is recognized in the modern along with other cephalopod taxa, from the warm-waters of regions of South Africa, Ghana, Antarctica, and southern low to middle paleolatitudinal regions, including Morocco South America. It is certainly characterized by a high level (e.g., Termier and Termier 1950; Kröger 2008; Pohle and of supra-generic endemic taxa (namely trilobites) and a scar- Klug 2018), Algeria (Le Maitre 1952), France (e.g., Teichert city (or absence) of some typical Palaeozoic groups such 1961; Babin 1966), Germany (e.g., Beyrich 1850; Bandel as stromatoporoids, graptolites, conodonts, and goniatites and Stanley 1989), Russia (Zhuravleva 1961; Zhuravleva and (Boucot and Racheboeuf 1993). Doguzhaeva 2004), North America, Turkey (e.g., Stanley and Here, we report the first record of lamellorthoceratids Teichert 1976; Bandel and Stanley 1989), and Japan (Niko from the Devonian of Argentina. This discovery is signif- 1991). Other groups with restricted known palaeolatitudinal icant in this scenario, especially with regard to the alleged distribution are the actinoceratids, discosorids, and ascocer- scarcity of Malvinokaffric cephalopods was recently dis- atids (e.g., Kröger 2013). For the last group, new findings from cussed in relation to the first records of bactritoids from the the Paraná Basin (Brazil) have recently shown that their dis- Devonian of South America (Cichowolski and Rustán 2017), tribution pattern should be revised (Cichowolski et al. 2018). a group with evolutionary significance and a wider distribu- Acta Palaeontol. Pol. 65 (2): 305–312, 2020 https://doi.org/10.4202/app.00699.2019 306 ACTA PALAEONTOLOGICA POLONICA 65 (2), 2020 tion than previously recognised. Based on the preservation wards into sand-rich horizons (Fig. 1). This unit corresponds of the specimens and previous studies, the distribution and to a muddy shelf depositional system developed during a high mode of life of lamellorthoceratids are discussed. stand system tract (Astini 1991). In San Juan Province, this unit increases in thickness from the south, where it is 300 Institutional abbreviations.—CEGH-UNC, Cátedra de Es- m thick (in the Talacasto section), to more than 1000 m in tra tigrafía y Geología Histórica-Universidad Nacional de the north (near Río Jáchal, Fig. 1). It overlies the mainly late Córdoba, Córdoba, Argentina; CICTERRA, Centro de Inves- Silurian shelf deposits of the Los Espejos Formation, and un- tigaciones en Ciencias de la Tierra, CONICET-Uni versidad derlies the turbiditic deposits of the Early to, probably, Middle Nacional de Córdoba, Córdoba, Argentina; CIPAL, Centro de Devonian Punta Negra Formation (Bracaccini 1950; Bustos Investigaciones Paleobiológicas, Córdoba, Argen tina. and Astini 1997). The Talacasto Formation has yielded the bulk of Devonian fossils described from Argentina. As in other closely related Early to Middle Devonian Malvinokaffric Material and methods basins, conodonts and graptolites are absent and goniatites are extremely rare. Thus, an early Lochkovian to Emsian The material described herein is housed at the Centro de age has been proposed for this unit based on brachiopod Investigaciones en Ciencias de la Tierra (CICTERRA) with and palynological data (Benedetto et al. 1992; Herrera 1993, the prefix CEGH-UNC. We studied three specimens from two 1995a, b; Lé Herissé et al. 1996; Herrera and Bustos 2001; collecting sites in the San Juan Province (Fig. 1): Quebrada de García-Muro et al. 2014, 2018). Further precision in relation to los Algarrobos at GPS coordinates 31°11’21.4” S, 68°49’18.5” the stratigraphy and age of the cephalopod-bearing horizons W (CEGH-UNC 27426), and Loma de los Piojos at GPS way- were provided by Cichowolski and Rustán (2017). point 30°17’2.6” S, 68°46’34.86” W (CEGH-UNC 27427-28). CEGH-UNC 27426 came from the horizon correspond- CEGH-UNC 27426 is an incomplete phragmocone preserved ing to that described by Carrera et al. (2013: fig. 2) where within a nodule. It was longitudinally cut and polished to see branched corals in life position are present. It is in the green internal details of the siphuncle and cameral deposits. CEGH- muddy lower interval of the unit, about 70 m above the bound- UNC 27427 is a small part of the phragmocone preserved ary with the underlying Los Espejos Formation. García Muro without shell wall, so that the internal lamellae can be seen in et al. (2014) proposed a most probable Pragian age for this three dimensions filling the whole chamber space, and form- stratigraphic position. CEGH-UNC 27427 and CEGH-UNC ing an internal mould. CEGH-UNC 27428 consists of three 27428 came from the Loma de los Piojos section, approxi- separate fragments: one is an external mould with a small mately 7 km to the southwest of the city of Jáchal (Fig. 1). part of the internal mould of one chamber (mainly consisting They were collected from a horizon nearly 5 m above the in cameral deposits), and the others consist of internal moulds Keidel’s bed (see Cichowolski and Rustán 2017). These spec- of phragmocone chambers, composed of somewhat altered imens originate from a slightly more indurate and darker cameral lamellar deposits. portion of a massive greenish-brown dark muddy bed (Fig. 1). Specimens were prepared using pneumatic air scribes Although this was previously considered to be Emsian in age, and needles under a binocular microscope. They were pho- it is probably Pragian in age, according to recent palynologi- tographed dry and also submersed in water or alcohol (in cal evidences reported by García Muro et al. (2018). particular the cut and polished specimen). We used a Canon Power Shot S50 digital camera mounted on a Leica MZ75 binocular. All measurements were taken using digital cal- ipers with a resolution of 0.1 mm. The measurements were Systematic palaeontology taken according to Evans (2005). Class Cephalopoda Cuvier, 1797 Subclass Orthoceratia Teichert, 1967 Geological setting Order Astroviida Zhuravleva and Doguzhaeva, 2004 Suborder Pallioceratina Marek, 1998 In the context of the Andean region of southern South Ame- rica, the area from which these specimens were recorded cor- Remarks.—The assignment of the family Lamellorthocerati- responds to the Argentine Precordillera Basin in west-cen- dae to a higher rank group lacks a general consensus. Initially tral Argentina. The studied specimens come from the Lower treated as Michelinoceratida (= Orthoceratida) by Teichert Devonian Talacasto Formation (Padula et al. 1967), widely (1961), Kröger (2008), followed by Klug et al. (2008a) and
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