New and little-known bryozoans from Monte León Formation (early Miocene, Argentina) and their paleobiogeographic relationships

Pérez, Leandro Martín; López-Gappa, Juan; Griffin, Miguel

doi:10.1017/jpa.2015.64

Cited by 12 publications

(6 citation statements)

References 41 publications

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“…No representatives of this genus had been recorded yet outside the Chatham Islands. The occurrence of two species of Melychocella in the Neogene of Patagonia expands the temporal range of the genus and lends further support to the hypothesis of a close link between the faunas of the southern tip of South America and the Australasian region during the early Miocene, as has been discussed in detail in previous studies (Casadío et al, 2010; Pérez et al, 2015; López-Gappa et al, 2017).…”

Section: Discussionsupporting

confidence: 78%

Taxonomic status of some species of Aspidostomatidae (Bryozoa, Cheilostomata) from the Oligocene and Miocene of Patagonia (Argentina)

2018

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The bryozoan genus Aspidostoma Hincks, 1881 has been regarded as the only representative of the Aspidostomatidae Jullien, 1888 in Argentina to date. Its type species, Aspidostoma giganteum (Busk, 1854), is presently distributed in the Magellanic Region (Argentina and Chile) and has been recorded in Oligocene and Miocene fossil deposits of Santa Cruz and Chubut, respectively. New material from San Julián (late Oligocene), Monte León (early Miocene), Chenque (early to middle Miocene), and Puerto Madryn (late Miocene) formations suggests, however, that A. giganteum is not represented in the fossil record. Material from Puerto Madryn Formation previously regarded as A. giganteum is here recognized as Aspidostoma roveretoi new species. Aspidostoma ortmanni Canu, 1904 is revalidated for the species from the San Julián Formation. Aspidostoma armatum new species and Aspidostoma tehuelche new species are introduced for material from the Monte León and Chenque formations, respectively. Aspidostoma incrustans Canu, 1908, from the early Miocene, is redescribed. Melychocella Gordon and Taylor, 1999, which differs from Aspidostoma in having vicarious avicularia and lacking a median ridge and a quadrangular process proximal to the opesia-orifice, is so far represented by three Paleogene species from the Chatham Islands (Southwest Pacific). The material from Monte León allowed us to transfer Aspidostoma flammulum Canu, 1908 to Melychocella, resulting in the new combination Melychocella flammula (Canu, 1908). Melychocella biperforata new species is described from the lower Miocene Monte León and Chenque formations. The presence of Melychocella in the Neogene of Patagonia extends its geographic distribution and its temporal range.UUID: http://zoobank.org/d84df2d8-cab2-4e74-82b8-7c67d938a58f

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Section: Discussionsupporting

confidence: 78%

Taxonomic status of some species of Aspidostomatidae (Bryozoa, Cheilostomata) from the Oligocene and Miocene of Patagonia (Argentina)

2018

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“…Two anonymous reviewers made useful comments on an earlier version of this paper. Financial support by CONICET (PIP 2013-2015 No. 00247 to JLG) and ANPCyT (PICT 2012-1043 to JLG and PICT 2012-1726 to MG) is acknowledged.…”

Section: Acknowledgementsmentioning

confidence: 99%

First record of a fossil selenariid bryozoan in South America

López-Gappa¹,

Pérez²,

Griffin³

2017

Alcheringa: An Australasian Journal of Palaeontology

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Selenariidae Busk 1854 (Bryozoa) is considered endemic to Australia and New Zealand. Here we describe a new species of Selenaria Busk 1854 from the lower Miocene Monte León Formation (Patagonia, Argentina). Selenaria lyrulata sp. nov. is characterized by autozooids with a lyrula-like, anvil-shaped cryptocystal denticle, opesiular indentations and lateral condyles, as well as avicularia with a shield of fused costae. This is the first record of a selenariid bryozoan in South America.

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“…In the outcrop section at Cabeza de León, the Monte León Formation is composed of an ∼47 m siliciclastic sequence showing bioturbated fine sediments and layers containing abundant macroinvertebrate remains (Parras et al, 2012), among which there is a rich association of bryozoans (see Pérez et al, 2015Pérez et al, , 2018López-Gappa et al, 2017;López-Gappa and Pérez, 2019). The Chenque Formation is characterized by a very bioturbated siliciclastic sequence with alternating sandy and pelitic levels, showing interspersed bioclastic layers with big oysters.…”

Section: Geologic Settingmentioning

confidence: 99%

Three new cribrimorph bryozoans (order Cheilostomatida) from the early Miocene of Argentina, with a discussion on spinocystal shield morphologies

López-Gappa

Pérez

Almeida³

et al. 2021

J. Paleontol.

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Bryozoans with calcified frontal shields formed by the fusion of costae, collectively constituting a spinocyst, are traditionally assigned to the family Cribrilinidae. Today, this family is regarded as nonmonophyletic. In the Argentine Cenozoic, cribrilinids were until recently represented by only two fossil species from the Paleocene of Patagonia. This study describes the first fossil representatives of Jolietina and Parafigularia: J. victoria n. sp. and P. pigafettai n. sp., respectively. A fossil species of Figularia, F. elcanoi n. sp., is also described. The material comes from the early Miocene of the Monte León and Chenque formations (Patagonia, Argentina). For comparison, we also provide redescriptions of the remaining extant species of Jolietina: J. latimarginata (Busk, 1884) and J. pulchra Canu and Bassler, 1928a. The systematic position of some species previously assigned to Figularia is here discussed. Costafigularia n. gen. is erected, with Figularia pulcherrima Tilbrook, Hayward, and Gordon, 2001 as type species. Two species previously assigned to Figularia are here transferred to Costafigularia, resulting in C. jucunda n. comb. and C. tahitiensis n. comb. One species of Figularia is reassigned to Vitrimurella, resulting in V. ampla n. comb. The family Vitrimurellidae is here reassigned to the superfamily Cribrilinoidea. The subgenus Juxtacribrilina is elevated to genus rank. Inferusia is regarded as a subjective synonym of Parafigularia. Parafigularia darwini Moyano, 2011 is synonymized with I. taylori Kuklinski and Barnes, 2009, resulting in Parafigularia taylori n. comb. Morphological data suggest that these genera comprise different lineages, and a discussion on the disparities among cribrilinid (sensu lato) spinocysts is provided. UUID: http://zoobank.org/215957d3-064b-47e2-9090-d0309f6c9cd8

show abstract

New and little-known bryozoans from Monte León Formation (early Miocene, Argentina) and their paleobiogeographic relationships

Cited by 12 publications

References 41 publications

Taxonomic status of some species of Aspidostomatidae (Bryozoa, Cheilostomata) from the Oligocene and Miocene of Patagonia (Argentina)

Taxonomic status of some species of Aspidostomatidae (Bryozoa, Cheilostomata) from the Oligocene and Miocene of Patagonia (Argentina)

First record of a fossil selenariid bryozoan in South America

Three new cribrimorph bryozoans (order Cheilostomatida) from the early Miocene of Argentina, with a discussion on spinocystal shield morphologies

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