Taxonomic reassessment of Gracilaria cearensis (Rhodophyta, Gracilariales), a poorly defined yet common flattened species based on morphological and molecular analysis including topotype collections

Phytotaxa ◽  
2015 ◽  
Vol 201 (4) ◽  
pp. 241 ◽  
Author(s):  
Luanda Pereira Soares ◽  
Carlos Frederico Deluqui Gurgel ◽  
Mutue Toyota Fujii
Keyword(s):  
Phenotypic Plasticity ◽  
Genetic Divergence ◽  
Sequence Divergence ◽  
Taxonomic Status ◽  
Original Description ◽  
Distinct Species ◽  
Molecular Data ◽  
Rbcl Gene ◽  
Similar Species ◽  
The World

The genus Gracilaria is the major source of agarose in the world today and is one of the most species-rich genera in the Rhodophyta. Flat Gracilaria species are among the most taxonomically challenging taxa due to their widespread phenotypic plasticity among all species. Gracilaria cearensis is a flat species described in 1965 from Brazil. Its original description is not conducive to accurate taxonomic identifications and the delineation of this taxon remains elusive. New samples of G. cearensis were collected across a coastal length of 500 km including its type locality. Universal Plastid Amplicon (UPA) and the rbcL gene were used to confirm the phylogenetic and taxonomic status of this poorly known species. Results showed that this is a distinct species despite morphological similarities to G. hayi, G. cuneata, G. curtissiae, G. brasiliensis and G. galetensis. G. cearensis is sister to G. hayi yet the genetic divergence between these two species was 2% for rbcL and 1.08% for UPA, enough to consider them distinct taxa. However, newly generated molecular data placed G. smithsoniensis, another morphologically similar species, as conspecific with G. cearensis with only 0.07% rbcL sequence divergence between them.

Emended description and resurrection of Sciaphila tosaensis and S. megastyla (Triuridaceae)

Phytotaxa ◽  
2019 ◽  
Vol 413 (3) ◽  
pp. 231-243 ◽  
Author(s):  
KENJI SUETSUGU ◽  
AKIHIKO KINOSHITA ◽  
TIAN-CHUAN HSU
Keyword(s):  
Genetic Divergence ◽  
Taxonomic Status ◽  
Distinct Species ◽  
Molecular Data ◽  
Genetic Distances ◽  
The Other ◽  
Morphological Data ◽  
Flowering Stage ◽  
Emended Description ◽  
Morphological Differences

This paper presents a re-evaluation of the taxonomic status of Sciaphila tosaensis and S. megastyla (Triuridaceae) distributed in Japan and Taiwan. Based on the detailed morphological data, we concluded that these two species should both be treated as distinct species rather than synonyms of S. secundiflora. Sciaphila tosaensis differs from S. secundiflora and S. megastyla in having very narrow male perianth segments and female perianth segments distinctly shorter than male perianth segments. Sciaphila megastyla differs from the other two species in having very conspicuous style and stigma that is ca. 1.5 times as long as ovary in the flowering stage. Furthermore, a lectotype is designated of S. megastyla because its holotype has been lost. Molecular data also showed that there is considerable genetic divergence between S. tosaensis and S. megastyla, supporting that the morphological differences are mirrored by their genetic distances.

scholarly journals A NEW SPECIES OF THE Pareas hamptoni COMPLEX (SQUAMATA, SERPENTES, PAREIDAE) FROM THE GOLDEN TRIANGLE

2020 ◽  
pp. 174-193
Author(s):  
Li Ding ◽  
Zening Chen ◽  
Chatmongkon Suwannapoom ◽  
Tan Van Nguyen ◽  
Nikolay A. Poyarkov ◽  
...  
Keyword(s):  
New Species ◽  
Yunnan Province ◽  
Southern China ◽  
Taxonomic Status ◽  
Distinct Species ◽  
Molecular Data ◽  
Lower Number ◽  
Actual Distribution ◽  
Golden Triangle ◽  
Morphological And Molecular Data

An investigation of the taxonomic status of Pareas hamptoni (Hampton's Slug snake) based on morphological and molecular data revealed a new distinct species from the Golden Triangle region (comprising parts of southern China, and adjacent Laos and Thailand). The new species is shown to be a sister species to P. hamptoni but can be separated from the latter by having 3–5 dorsal scale rows at midbody slightly keeled (vs 5–9 scales strongly keeled); a lower number of ventrals, 170–188 (vs 185–195); and a lower number of subcaudals, 67–91 (vs 91–99). The new species is currently known from northwestern Thailand, northern Laos, and the southern part of Yunnan Province in China at elevations of 1,160–2,280 m a.s.l. We suggest that the new species to be considered of Least Concern (LC) in the IUCN‘s Red List categories. Problems of taxonomy and actual distribution of the P. hamptoni complex are briefly discussed; our results show P. hamptoni is now reliably known only from Myanmar and Vietnam, but its occurrence in Yunnan Province of China is likely.

Gelidium guimaraesiae sp. nov. (Gelidiaceae, Rhodophyta) from the Western Atlantic segregated from G. floridanum by morphological and molecular evidence

Phytotaxa ◽  
2019 ◽  
Vol 388 (4) ◽  
pp. 275 ◽  
Author(s):  
BEATRIZ BRUNELLI ◽  
DANIELA MILSTEIN ◽  
SUNG M. BOO ◽  
MUTUE T. FUJII
Keyword(s):  
Dna Sequences ◽  
Sequence Divergence ◽  
Molecular Data ◽  
Brazilian Coast ◽  
Molecular Evidence ◽  
Similar Species ◽  
Western Atlantic ◽  
Gelidium Floridanum ◽  
Morphological And Molecular Data ◽  
A New Species

The Gelidium species are susceptible to a great phenotypic plasticity. In this genus, studies integrating morphological and molecular data have been increasingly used to define species. To date nine Gelidium species are reported along the Brazilian coast. Gelidium floridanum is the most frequently recorded species in Brazilian but it is also often confused with morphologically similar species, especially in the field or when reproductive structures are absent. In this study we analyzed specimens from Brazil previously identified as G. floridanum based on the morphological and molecular data (cox1 and rbcL DNA sequences). Newly collected specimens from Brazil showed a DNA sequence divergence from G. floridanum in the order of 1.0–1.4% for rbcL and 4.2% for cox1, enough to be considered a new species, here described as Gelidium guimaraesiae sp. nov.

The systematics of the south-east Asian genus Fangensis Rambla (Opiliones:Cyphophthalmi:Stylocellidae)

2005 ◽  
Vol 19 (4) ◽  
pp. 297 ◽  
Author(s):  
Peter J. Schwendinger ◽  
Gonzalo Giribet
Keyword(s):  
East Asian ◽  
Original Description ◽  
Distinct Species ◽  
Molecular Data ◽  
Ribosomal Genes ◽  
The Other ◽  
Morphological Data ◽  
Southern Thailand ◽  
New Material ◽  
Three New Species

The hitherto monotypic opilionid genus Fangensis Rambla, 1994 is re-evaluated from new material collected in northern, western and southern Thailand. The original description of F. leclerci Rambla (type material not traceable) was based on specimens belonging to at least three distinct species. Fangensis leclerci is thus redefined and the binomen restricted to specimens from a cave in northern Thailand only. Three new species are described, F. spelaeus, sp. nov. and F. cavernarus, sp. nov. from two caves in western Thailand and F. insulanus, sp. nov. from forests on two islands in southern Thailand. Taxonomic characters are discussed and relationships among Fangensis species and between Fangensis and other cyphophthalmids are evaluated using morphological data and ~4 Kb of molecular data from three loci, two nuclear ribosomal genes and a mitochondrial coding gene. Overall, data indicate monophyly of Stylocellidae and morphological and ribosomal data suggest monophyly of Fangensis, which is in turn divided into two clades, one composed of the three species from northern and western Thailand and the other represented by the species from southern Thailand. Observations on mating in F. leclerci are provided.

The taxonomic status of Cryptobatrachus frogs (Anura: Hemiphractidae) from the Serranía del Perijá

Zootaxa ◽  
2021 ◽  
Vol 5068 (2) ◽  
pp. 247-262
Author(s):  
FABIO LEONARDO MEZA-JOYA ◽  
ELIANA RAMOS ◽  
FERNANDO J. M. ROJAS-RUNJAIC ◽  
ANDRÉS OVALLE-PACHECO
Keyword(s):  
Dna Sequences ◽  
Genetic Divergence ◽  
Morphological Traits ◽  
Phylogenetic Analyses ◽  
Taxonomic Status ◽  
Molecular Data ◽  
The Other ◽  
Taxon Sampling ◽  
Morphological Similarity ◽  
Morphological And Molecular Data

The Neotropical frog genus Cryptobatrachus includes six currently recognized species distributed throughout the northern Andes in Colombia and Venezuela. Cryptobatrachus conditus, C. pedroruizi, and C. remotus were described from the Colombian and Venezuelan slopes of the Serranía del Perijá. Due to the great morphological similarity among these species, we re-assess their taxonomic status based on morphological and molecular data from types, topotypes, and specimens from localities referred to in the original descriptions of these species. Morphometric comparisons showed that all these species are virtually indistinguishable, although some subtle qualitative differences in morphological traits distinguish C. conditus from the other species. Phylogenetic analyses of DNA sequences found that C. remotus and C. pedroruizi are not reciprocally monophyletic and exhibit low genetic divergence (< 1 %). Therefore, C. remotus should be considered a junior synonym of C. pedroruizi. This work stresses the importance of comprehensive taxon sampling in poorly explored areas, especially between neighbouring countries.  

A new four-pored Amphisbaena (Squamata: Amphisbaenidae) from northeastern Brazil

Zootaxa ◽  
2018 ◽  
Vol 4514 (4) ◽  
pp. 553 ◽  
Author(s):  
JOÃO PAULO FELIX AUGUSTO DE ALMEIDA ◽  
MARCO ANTONIO DE FREITAS ◽  
MÁRCIO BORBA DA SILVA ◽  
MARIA CELESTE COSTA VALVERDE ◽  
MIGUEL TREFAUT RODRIGUES ◽  
...  
Keyword(s):  
New Species ◽  
16S Rrna ◽  
Genetic Divergence ◽  
Molecular Data ◽  
Northeastern Brazil ◽  
Mountain Range ◽  
Similar Species ◽  
Morphological And Molecular Data ◽  
Tail Tip ◽  
A New Species

A new species of Amphisbaena from the Espinhaço Mountain Range in Bahia State is described based on morphological and molecular data. Amphisbaena caetitensis sp nov. is a small four-pored amphisbaenian with 186–194 body annuli, 10–12 tail annuli, 16 dorsal and 19–22 ventral segments on a midbody annulus and a strikingly distinctive tail tip. The most similar species is A. uroxena, but they can be distinguished by some morphological features besides the genetic divergence of 7.65% on the mitochondrial 16S rRNA. 

Re-establishment of Chamaecrista cultrifolia (Leguminosae, Caesalpinioideae) based on morphological and molecular analyses

Phytotaxa ◽  
2016 ◽  
Vol 265 (3) ◽  
pp. 183 ◽  
Author(s):  
ARIANE RAQUEL BARBOSA ◽  
MARLON CÂMARA MACHADO ◽  
GWILYM PETER LEWIS ◽  
FÉLIX FOREST ◽  
LUCIANO PAGANUCCI DE QUEIROZ
Keyword(s):  
Morphological Variation ◽  
Original Description ◽  
Distinct Species ◽  
Molecular Data ◽  
The Other ◽  
Molecular Analyses ◽  
The Third ◽  
Morphological And Molecular Data

The wide morphological variation observed in Chamaecrista diphylla was analyzed using morphological and molecular data. Three distinct morphotypes were identified, namely: a morphotype corresponding to the original description of Chamaecrista diphylla, a second morphotype corresponding to the original description of the synonym Chamaecrista cultrifolia, and a third morphotype with shared characteristics of the other two, which in the molecular analyses grouped with the C. cultrifolia morphotype. Chamaecrista cultrifolia is re-established as a distinct species, but its circumscription is emended to include the third morphotype identified in the morphological and molecular analyses of this study.

Morphological and genetic variations of Ommatotriton in Turkey

2013 ◽  
Vol 63 (3) ◽  
pp. 297-312 ◽  
Author(s):  
Ufuk Bülbül ◽  
Bilal Kutrup
Keyword(s):  
16S Rrna ◽  
16S Rrna Gene ◽  
Black Sea ◽  
Sequence Divergence ◽  
Distinct Species ◽  
Molecular Data ◽  
Canonical Variate ◽  
Rrna Gene ◽  
Cytb Gene ◽  
Homogeneous Groups

The classification of European newts has fluctuated throughout history based on morphological and genetic discoveries. In this study, specimens of Ommatotriton from Turkey were compared by using morphometrical features and partial mitochondrial sequences data. When we used the TCS program, 15 haplotypes were found for a 541 bp fragment of the 16S rRNA gene in 118 specimens, while 25 haplotypes were found for a 398 bp fragment of the cytb gene in 112 specimens. The sequence divergence of 16S rRNA gene ranged from 0.18% to 5.70% while for cytb gene it ranged from 0.25% to 12.84%. Combined sequences showed that newts collected in three distinct geographical areas of Turkey (Southern Anatolia, Western Black Sea and Eastern Black Sea) form four distinct lineages (Hatay, Adana-Mersin, Western Black Sea and Eastern Black Sea). A total of 195 adult specimens (94 males and 101 females) from 20 different populations belonging to the three distinct geographic areas were used in the morphometrical comparisons. Canonical Variate Analysis demonstrated that the four groups were successfully separated and formed geographically homogeneous groups in the canonical space. As a conclusion, our molecular data suggest that individuals from Western Black Sea are not conspecific with Eastern Black Sea ones and they could represent a good species (Ommatotriton nesterovi). Finally, we suggest that three distinct species, O. nesterovi, O. ophryticus and O. vittatus should be recognised as banded newts of Turkey.

A new species of Tashiroea (Melastomataceae, Sonerileae) from Guangxi, China

Phytotaxa ◽  
2019 ◽  
Vol 414 (6) ◽  
pp. 269-279
Author(s):  
QIU-JIE ZHOU ◽  
JIN-HONG DAI ◽  
REN-CHAO ZHOU ◽  
YING LIU
Keyword(s):  
Sequence Divergence ◽  
Distinct Species ◽  
Molecular Data ◽  
Apex Acuminate ◽  
Molecular Phylogenetic ◽  
Well Differentiated ◽  
Morphological And Molecular Data ◽  
A New Species ◽  
Molecular Phylogenetic Data ◽  
Fruit Stage

Tashiroea dayaoshanensis (Melastomataceae, Sonerileae), a species from northeastern Guangxi, China and previously often identified as Phyllagathis nudipes or P. oligotricha in Chinese herbaria, is described as new based on morphological and molecular data. Indumentum, leaf texture and surface sculpture, capsule morphology and molecular phylogenetic data strongly support the placement of T. dayaoshanensis within the Tashiroea clade which should be accommodated in Tashiroea. Morphology as well as sequence divergence of the nrITS region indicate that T. dayaoshanensis is well differentiated from other species in the same clade, and thus should be treated as a distinct species. Tashiroea dayaoshanensis is phylogenetically closest to Bredia sessilifolia but can be easily distinguished by its petiolate leaves (vs. sessile or subsessile), and crowned ovary (vs. uncrowned). It resembles P. nudipes and P. oligotricha in habit and stamen morphology but differs from both in its leaf apex acuminate (vs. acute to obtuse), connective ventrally tuberculate (vs. not tuberculate) and ovary crown exerted from calyx tube during young fruit stage (vs. not exerted).

scholarly journals TAXONOMIC IDENTITY OF ARISAEMA CONDAOENSE (ARACEAE) BASED ON NEW MORPHOLOGICAL AND MOLECULAR DATA

2018 ◽  
Vol 15 (4) ◽  
pp. 661-668
Author(s):  
Van Hong Thien ◽  
Phi Nga Nguyen ◽  
Luu Hong Truong
Keyword(s):  
National Park ◽  
Morphological Characteristics ◽  
Original Description ◽  
Distinct Species ◽  
Detailed Examination ◽  
Molecular Data ◽  
Matk Gene ◽  
Morphological And Molecular Data ◽  
First Time ◽  
A New Species

Arisaema condaoense V.D. Nguyen was described as a new species from Con Dao National Park, Ba Ria–Vung Tau Province, Vietnam in 2000. However, this species has been suspected of being a form of Arisaema roxburghii Kunth, a species widespread in the whole Indochina and Malay Peninsula. This was due to the original description based on dried specimens with male inflorescences only. Morphological characteristics of female inflorescences, which are of taxonomical importance to identify the species, have not been known. In June 2015, we re-sampled the plant in Con Dao National Park with both male and female inflorescences for detailed examination of morphological characteristics. Besides, the matK gene of the chloroplast genome of this species was sequenced to analyse its phylogenetic relationship with other Arisaema species. The gathered morphological and molecular data indicate that A. condaoense is certainly a distinct species, not a synonym of A. roxburghii. The noted morphological characteristics also provide key differences to distinguish A. condaoense from two other morphologically close species of sect. Fimbriata (i.e A. maxwellii from Thailand and A. pierreanum from Vietnam which also share yellow spathes and several other characteristics in common), which are supported by the molecular data. Thus, the species is endemic to Con Dao National Park in Ba Ria–Vung Tau Province, Vietnam. Furthermore, this study allows us revising the description of A. condaoense with, for the first time, supplemental key taxonomic characteristics and illustrating colourful photographs taken from the fresh materials. A key to all eight known Vietnamese species of sect. Fimbriata is also given.

Sign in / Sign up

Export Citation Format

Share Document