Cytology of the fern flora of Tristan da Cunha

Twenty species out of a total of twenty-six leptosporangiate ferns known to occur on Tristan da Cunha have been examined cytologically. Four species have been independently examined from Gough with concordant results. Hymenophyllum tunbrigense , included among the Tristan species, is a new record for the island. Other points of special interest about individual taxa include demonstration of an extremely high chromosome number ( n = 174) in the supposedly endemic species Eriosorus cheilanthoides , demonstration of the existence of two different cytotypes (one only present on Tristan) within Blechnum penna-marina in the southern hemisphere and of complex polyploid relationships affecting several other taxa which are discussed individually. In addition the cytological composition of the fern flora as a whole is discussed in relation to other temperate and tropical floras in or near the Atlantic basin.

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The Sinking of Another Tristan da Cunha Moss Endemic and Its Phytogeographical Consequences

Acta Societatis Botanicorum Poloniae ◽

10.5586/asbp.8936 ◽

2020 ◽

Vol 89 (3) ◽

Cited By ~ 1

Author(s):

Ryszard Ochyra ◽

Vítězslav Plášek

Keyword(s):

Atlantic Ocean ◽

Southern Hemisphere ◽

Endemic Species ◽

Distribution Patterns ◽

South Atlantic ◽

South Atlantic Ocean ◽

Original Material ◽

The Third ◽

Tristan Da Cunha ◽

Central South

The original material of Isopterygium tristaniense Dixon, an endemic species of the Tristan da Cunha archipelago in the central South Atlantic Ocean, is taxonomically evaluated and some details of its morphology are illustrated. The species is found to be conspecific with the Holarctic Pseudotaxiphyllum elegans (Brid.) Z.Iwats. and it is the third record of the species in the Southern Hemisphere. The global distribution of this species is reviewed and the distribution patterns of the South Atlantic mosses are briefly discussed.

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Reassessment of Tristan da Cunha Gelidium (Gelidiales, Rhodophyta) species

Botanica Marina ◽

10.1515/bot-2020-0036 ◽

2020 ◽

Vol 63 (5) ◽

pp. 455-462

Author(s):

D. Wilson Freshwater ◽

Sue Scott ◽

Enrico M. Tronchin ◽

Gary W. Saunders

Keyword(s):

Southern Africa ◽

Endemic Species ◽

Red Algae ◽

Genetic Group ◽

The Third ◽

Tristan Da Cunha

AbstractThree endemic species of Gelidium have been described from the remote Tristan da Cunha archipelago. A recent barcode survey of Tristan da Cunha red algae in combination with the clarification of vouchers for previously sequenced specimens has prompted a molecular and morphological reassessment of these species. Analyses of rbcL and COI-5P data indicated that all sequenced Tristan da Cunha specimens represented a single taxon, and furthermore that this genetic group was conspecific with Gelidium micropterum from southern Africa. Morphologically the Tristan da Cunha specimens represented either Gelidium concinnum or Gelidium regulare, and there was a grade of character states between both of these species, as well as G. micropterum. Based on these results the synonymy of G. concinnum and G. regulare under G. micropterum is proposed and an expanded description of G. micropterum provided. None of the studied Tristan da Cunha specimens clearly fit the description of the third endemic species, Gelidium inflexum, and its status could not be determined.

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A new record of Zatypota albicoxa (Hymenoptera: Ichneumonidae) from Indonesia, with description of a new species of its host spider (Araneae: Theridiidae)

Zootaxa ◽

10.11646/zootaxa.2910.1.3 ◽

2011 ◽

Vol 2910 (1) ◽

Author(s):

KEIZO TAKASUKA ◽

HAJIME YOSHIDA ◽

PUTRA NUGROHO ◽

RIKIO MATSUMOTO

Keyword(s):

New Species ◽

Southeast Asia ◽

Southern Hemisphere ◽

New Record ◽

First Record ◽

Oriental Region ◽

Indonesian Population ◽

A New Species

Zatypota albicoxa (Walker) is newly recorded from Mt. Merapi, Java Is., Indonesia. This is the first record of Z. albicoxa from this part of the Oriental region and from the Southern Hemisphere, and the first record of the genus Zatypota from Southeast Asia. The Indonesian population of Z. albicoxa attacks a theridiid spider of the genus Parasteatoda, as do populations of Z. albicoxa in other regions. The spider is a new species, and is described under the name of Parasteatoda merapiensis.

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Aspidistra papillata G.Z.Li (Asparagaceae Juss.): A New Record for the Flora of Vietnam

VNU Journal of Science Natural Sciences and Technology ◽

10.25073/2588-1140/vnunst.5105 ◽

2020 ◽

Vol 36 (4) ◽

Author(s):

Nguyen Sinh Khang ◽

Hoang Thanh Son ◽

Nguyen Trung Thanh

Keyword(s):

Endemic Species ◽

New Record ◽

Morphological Characteristics ◽

Biological Information ◽

Information Ecology ◽

Colour Illustration

This study presents the morphological characteristics, colour illustration, biological information, ecology and distribution of Aspidistra papillata G.Z. Li, formerly considered as an endemic species to China, but recently discovered and recorded for the Flora of Vietnam, to identify new aspects of this species.

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High Chromosome Number and Giant Postreductional Sex Chromosomes in the Beetle Walterianella venusta Schaufuss (Chrysomelidae, Alticinae)

The Journal of Agriculture of the University of Puerto Rico ◽

10.46429/jaupr.v47i3.12947 ◽

1969 ◽

Vol 47 (3) ◽

pp. 154-163

Author(s):

Niilo Virkki

Keyword(s):

Chromosome Number ◽

Sex Chromosomes ◽

High Chromosome Number

A high chromosome number for a coleopteran, 22-J-X+y, was encountered in an alticine, Walterianella venusta Schaufuss. The autosomes are very short, metacentric; the sex chromosomes very long and also metacentric. The sex chromosomes are desynaptic and postreductional in spermatogenesis. It is assumed that two trends operate in the evolution of the alticine chromosomes, first, the autosomal chromatin being incorporated repeatedly in the sex chromosomes, and second, the occurrence of the multiplication of the short autosomes.

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Gondwanorchestia tristanensis gen. nov. sp. nov., a new southern hemisphere genus and species of talitrid amphipod (Amphipoda, Senticaudata, Talitridae)

Zootaxa ◽

10.11646/zootaxa.4748.2.9 ◽

2020 ◽

Vol 4748 (2) ◽

pp. 375-381

Author(s):

JAMES K. LOWRY ◽

ALAN A. MYERS ◽

JORGE PÉREZ-SCHULTHEISS

Keyword(s):

Atlantic Ocean ◽

Southern Hemisphere ◽

New Genus ◽

South Atlantic ◽

South Atlantic Ocean ◽

New Genus And Species ◽

The South ◽

Tristan Da Cunha

Material collected by the Norwegian Scientific Expedition to Tristan Da Cunha in the South Atlantic Ocean in the years 1937–1938 and later attributed by Stephensen, 1949 to Orchestia scutigerula Dana, 1852 has been re-examined and is described as a new genus and species, Gondwanorchestia tristanensis sp. nov. Orchestia scutigerula Dana, 1852 is transferred to Gondwanorchestia gen nov. and compared with G. tristanensis sp. nov.

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New record of Tettigarctidae (Insecta, Hemiptera, Cicadoidea) from the Lower Cretaceous of Brazil

Zootaxa ◽

10.11646/zootaxa.1087.1.5 ◽

2005 ◽

Vol 1087 (1) ◽

pp. 53 ◽

Cited By ~ 8

Author(s):

FEDERICA MENON

Keyword(s):

Southern Hemisphere ◽

Early Cretaceous ◽

Lower Cretaceous ◽

New Record ◽

New Genus ◽

New Genus And Species ◽

New Discovery

Tettagalma striata, new genus and species of Tettigarctidae (Hemiptera: Cicadoidea), is described from the Lower Cretaceous laminated limestones of the Crato Formation, Brazil. The new discovery represents the first certain record of this family in Brazil and confirms its presence in the Southern Hemisphere during the early Cretaceous. Architettix Hamilton, 1990, from the same formation, and all the taxa originally placed in Cicadoprosbolidae, are also included in Tettigarctidae, as the former is considered a synonym.

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Preface

Philosophical Transactions of the Royal Society of London Series B Biological Sciences ◽

10.1098/rstb.1965.0012 ◽

1965 ◽

Vol 249 (759) ◽

pp. 258-258

Keyword(s):

Geographical Distribution ◽

Endemic Species ◽

Scientific Interest ◽

Ecological Stability ◽

Ecological Balance ◽

Tristan Da Cunha ◽

Ecological Evolution ◽

Gough Island ◽

Island Group

The four islands of the Tristan da Cunha-Gough Island group are very isolated. They contain a unique fauna and flora. Knowledge of these is very incomplete in important respects. Such knowledge could not only help towards understanding the origins of the geographical distribution of plants and animals, it could also throw valuable light on the factors governing colonization of isolated regions. But it is not only the unique biota which is of scientific interest in these islands. We have here a natural ecological balance between the endemic species of an impoverished and therefore simple fauna and flora. Such islands could thus allow us to study with comparative ease the factors which control ecological stability; a study of the great importance to mankind today. Moreover, fortunately there have now been found in these islands evidence of datable remains of the geologically recent biota, so that there is a reasonable chance that we shall one day be able to trace the ecological evolution in time.

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Morphological and anatomical studies of the newly recorded Rhus chinensis Mill. (Anacardiaceae) from Turkey

Bangladesh Journal of Plant Taxonomy ◽

10.3329/bjpt.v25i1.37183 ◽

2018 ◽

Vol 25 (1) ◽

pp. 71-78 ◽

Cited By ~ 1

Author(s):

Özgür Eminagaoglu ◽

Melahat Ozcan

Keyword(s):

Chromosome Number ◽

New Record ◽

Morphological Description ◽

Flora Of Turkey ◽

Anatomical Studies ◽

Rhus Chinensis ◽

Leaf Surfaces ◽

Plant Taxon ◽

Anatomical Properties

Rhus chinensis Mill. (Anacardiaceae) has been reported as a new record for the flora of Turkey. Detailed morphological description and leaf anatomical properties are provided. Capitate glandular and nonglandular trichomes, and also epicuticle hairs have been observed in the leaf surfaces of R. chinensis. Fruit micromorphology and chromosome number of this species have also been evaluated.Bangladesh J. Plant Taxon. 25(1): 71-78, 2018 (June)

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