Shackletonia cryodesertorum (Teloschistaceae, Ascomycota), a new species from the McMurdo Dry Valleys (Antarctica) with notes on the biogeography of the genus Shackletonia

Mimosa arturoana (Mimosoideae, Leguminosae) is described and illustrated for the first time. This species is similar to the recently published M. lamolina and to the allopatric, Mexican M. deamii, but differs by several morphological characters, such as stems armament, secondary venation of leaflets and pubescence of vegetative organs and pods. This species should be included in the Mimosa sect. Mimosa ser. Mimosa subser. Lactifluae by its characteristic habit, armament of stems, and ecology. This finding increments the diversity of Leguminosae in the dry forests of Inter-Andean valleys of Peru, a potentially center of endemism of this family.

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Diacyclops (Copepoda: Cyclopoida) in Continental Antarctica, including three new species

Antarctic Science ◽

10.1017/s0954102013000643 ◽

2013 ◽

Vol 26 (3) ◽

pp. 250-260 ◽

Cited By ~ 6

Author(s):

Tomislav Karanovic ◽

John A.E. Gibson ◽

Ian Hawes ◽

Dale T. Andersen ◽

Mark I. Stevens

Keyword(s):

New Species ◽

Microbial Mats ◽

First Record ◽

Mcmurdo Dry Valleys ◽

Dry Valleys ◽

Robust Identification ◽

Continental Antarctica ◽

History Of ◽

Vestfold Hills ◽

Three New Species

AbstractContrary to earlier beliefs, crustaceans are present in ice-covered lakes of Antarctica. Interpretation of the significance of this has been hampered by the absence of robust identification of taxa present. We examine cyclopoid copepods from three widely separated lakes. All belong to the michaelseni group of the genus Diacyclops, which is widespread across Continental Antarctica, but do not fit into any existing species. Two new species were identified from eastern Antarctica, D. walkeri from Pineapple Lake (Vestfold Hills) and D. kaupi from Transkriptsii Gulf (Bunger Hills). Most significant was a dense population of a new epibenthic species (D. joycei) associated with microbial mats in Lake Joyce, one of the smaller McMurdo Dry Valleys lakes. This represents the first record of adult cyclopoid copepods from the ice-covered lakes of the Transantarctic Mountains. Continental Antarctica is the centre of diversity for this group of crustaceans and we argue that this is better explained by persistence through past glacial advances rather than by recent post-glacial colonization. The existence of a species endemic to Lake Joyce but apparently absent from other Dry Valleys lakes is discussed in relation to our understanding of the history of the McMurdo Dry Valleys lakes and their faunas.

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