A new Gripopterygidae (Plecoptera) species from southern Patagonia

Rainbow trout (Oncorhynchus mykiss) was first introduced into Argentinean Patagonia, the southernmost region of South America, from the United States in 1904 and at present constitutes the most conspicuous freshwater fish in lakes and rivers of the region. The Santa Cruz River in Southern Patagonia is the only river in the world where a self-sustained population of introduced rainbow trout is known to have developed an anadromous run. In this study, we examined mtDNA sequence variation to identify the source of Santa Cruz River rainbow trout, providing a historical framework to interpret the processes underlying phenotypic variation and structure of Patagonian populations. The Santa Cruz River may harbor distinct North American stocks of rainbow trout, widely distributed around the world during the late 19th and early 20th centuries, but today threatened after decades of habitat loss, species introduction, and introgression from alien stocks. The mtDNA sequence data revealed that the most likely origin for wild anadromous and nonanadromous fish was the McCloud River in California. Meanwhile, a local hatchery stock, representative of rainbow trout introduced from Denmark after 1950 and widely stocked ever since throughout Patagonia, most probably originated from multiple lineages from western North America, including non-Californian populations.

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First record of land gastropods of the family Charopidae in the Early to Middle Miocene from Santa Cruz Province, Southern Patagonia, Argentina (Gastropoda Pulmonata: Stylommatophora: Charopidae)

Archiv für Molluskenkunde International Journal of Malacology ◽

10.1127/arch.moll/1869-0963/141/057-066 ◽

2012 ◽

Vol 141 (1) ◽

pp. 57-66 ◽

Cited By ~ 1

Author(s):

Pablo E. Rodriguez ◽

Sergio E. Miquel ◽

Adán A. Tauber ◽

Jerónimo M. Krapovickas

Keyword(s):

Middle Miocene ◽

First Record ◽

Santa Cruz ◽

Southern Patagonia ◽

The Family

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Modiomytilus, a new mytilid bivalve from the Tertiary of southern Patagonia

Journal of Paleontology ◽

10.1017/s002233600001859x ◽

1990 ◽

Vol 64 (3) ◽

pp. 377-382 ◽

Cited By ~ 10

Author(s):

Miguel Griffin

Keyword(s):

New Species ◽

Adductor Muscle ◽

New Taxon ◽

Santa Cruz ◽

Southern Patagonia ◽

Two New Species

Modiomytilus n. gen. is described from Tertiary sediments exposed in the southwestern corner of Santa Cruz province (Argentina). This large mytilid is characterized by its ornamentation of strong comarginal undulations, its smooth ligamentary ridge, and its relatively large anterior adductor muscle. Two new species are assigned to it: Modiomytilus argentinensis n. sp., from the Centinela Formation (Miocene) south of Lago Argentino, and Modiomytilus mercerati n. sp., from the Río Turbio Formation (Eocene) in Sierra Dorotea. Although other species belonging to this new taxon and previously referred to Mytilus have been described from Tertiary sediments in the region, none are known so far from rocks of comparable age outside Patagonia.

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Climatically induced lake level changes during the last two millennia as reflected in sediments of Laguna Potrok Aike, southern Patagonia (Santa Cruz, Argentina)

Journal of Paleolimnology ◽

10.1007/s10933-004-5331-z ◽

2005 ◽

Vol 33 (3) ◽

pp. 283-302 ◽

Cited By ~ 143

Author(s):

Torsten Haberzettl ◽

Michael Fey ◽

Andreas L�cke ◽

Nora Maidana ◽

Christoph Mayr ◽

...

Keyword(s):

Lake Level ◽

Santa Cruz ◽

Lake Level Changes ◽

Southern Patagonia ◽

The Last Two Millennia

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Valve morphology of Didymosphenia geminata (Bacillariophyceae) from Santa Cruz and Tierra del Fuego provinces, Patagonia, Argentina.

Boletín de la Sociedad Argentina de Botánica ◽

10.31055/1851.2372.v55.n4.29634 ◽

2020 ◽

Vol 55 (4) ◽

Author(s):

Noelia M. Uyua ◽

Silvia E. Sala ◽

Norma H. Santinelli ◽

Alicia V. Sastre ◽

Juan I. Cortés ◽

...

Keyword(s):

Light And Electron Microscopy ◽

Central Area ◽

Point Of View ◽

Tierra Del Fuego ◽

Santa Cruz ◽

Didymosphenia Geminata ◽

Valve Morphology ◽

Massive Growth ◽

Southern Patagonia ◽

Morphology And Morphometry

Background and aims: In 2013, blooms similar to those produced by Didymosphenia geminata (Lyngbye) M. Schmidt around the world, were detected in the Grande River basin, Tierra del Fuego province, and in 2014 in de las Vueltas River in Santa Cruz province. The aim of this paper is to analyze the valve morphology and morphometry of these materials to establish if they correspond to D. geminata or to other species of the genus that is producing the massive growth in southern Patagonia. M&M: Samples were collected at Grande River in 2013 and 2015 and, in de las Vueltas River in 2015 and 2016. Samples were analyzed with light and electron microscopy. For morphometric analyses 100 specimens from each sample were measured and statistical analyses were carried out using the R statistical package. Results: The studied populations have the same fine morphology described for other populations collected in Patagonia. Nevertheless, in some sampling sites from Santa Cruz province, we found a morphotype with a markedly smaller size, subcapitated poles, little marked constrictions of the poles, a broad central area (relative to cell size) and 1 to 3 stigmata, that was never reported in South America. Conclusions: The studied populations correspond to D. geminata ssp. geminata Metzeltin & Lange-Bertalot. From a morphological point of view the smaller morphotype present in Santa Cruz belongs to the same subspecies but can be easily misidentified during the routine monitoring programs carried out with light microscope due its size and valve outline.

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Description of a new species of Microcerella (Diptera: Sarcophagidae) from Argentinean Patagonia

Zootaxa ◽

10.11646/zootaxa.1124.1.3 ◽

2006 ◽

Vol 1124 (1) ◽

pp. 47

Author(s):

JUAN C. MARILUIS

Keyword(s):

New Species ◽

New Record ◽

Santa Cruz ◽

Argentinean Patagonia ◽

A New Species

Microcerella coniceti sp. nov. is described and illustrated from Santa Cruz province, Argentina, based on male specimens. A new record of Microcerella curicoensis (Lopes) from Austral Argentinean Patagonia is provided.

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Three Pseudocerotidae species (Platyhelminthes, Polycladida, Cotylea) from the Argentinean coast

Zootaxa ◽

10.11646/zootaxa.2990.1.2 ◽

2011 ◽

Vol 2990 (1) ◽

pp. 30 ◽

Cited By ~ 4

Author(s):

VERÓNICA N. BULNES ◽

MARIANO J. ALBANO ◽

SANDRA M. OBENAT ◽

NÉSTOR J. CAZZANIGA

Keyword(s):

Morphological Variation ◽

Colour Pattern ◽

Rocky Shores ◽

Southwestern Atlantic ◽

Argentinean Patagonia ◽

Southern Patagonia ◽

The Mediterranean

Three species of flatworms, Phrikoceros mopsus (Marcus, 1952), Thysanozoon brocchii (Risso, 1818) and Thysanozoon mirtae sp. nov., are described from specimens collected from shallow rocky shores of Mar del Plata harbour, in the southwestern Atlantic. P. mopsus had been described as living in the coasts of Brazil and southern Patagonia. T. brocchii has a more extensive known distribution, from the Mediterranean to the coasts of Brazil and the Argentinean Patagonia. Their morphological variation is here recorded and discussed. Thysanozoon mirtae sp. nov. is characterized by its colour pattern, colourless tentacles, and the presence of well developed spermiducal vesicles and a strong parenchymatic musculature.

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