Genera Of Tribe Research Articles

A phylogenetic and taxonomic assessment of Afrotropical Micracidini (Coleoptera, Scolytinae) reveals a strong diversifying role for Madagascar

Afrotropical bark beetle genera in the tribe Micracidini are revised and an identification key provided. The new classification is based on phylogenetic analyses of five molecular markers (COI, EF-1α, 28S, PABP1, CAD) in combination with morphological characters. Five new genera are erected and one genus synonymized, resulting in a total of 11 valid genera: Lanurgus Eggers, 1920, Traglostus Schedl, 1938, Pseudomicracis Eggers, 1920 (=Saurotocis Wood, 1984 syn. nov.), Phloeocurus Wood, 1984, Afromicracis Schedl, 1959, Dendrochilus Schedl, 1959, Neomicracis Jordal gen. nov., Leiomicracis Jordal gen. nov., Diplotrichus Jordal gen. nov., Pseudolanurgus Jordal gen. nov., Microlanurgus Jordal gen. nov. The following new species are described to be included in the new genera: Leiomicracis aurea Jordal sp. nov., Neomicracis squamigera Jordal sp. nov., both from Tanzania, and Microlanurgus bicolor Jordal sp. nov. and Microlanurgus ater Jordal sp. nov., from Madagascar. The following new synonyms and new combinations are proposed: Afromicracis dubius (Schedl, 1950) (=Afromicracis angolensis Schedl, 1962 syn. nov.), Afromicacis elongatulus (Schedl, 1977) comb. nov.,Afromicracis jasminiae (Schedl 1957) comb. nov. (=Dendrochilus mikaniae Schedl 1957 syn. nov.), Afromicracis robustus (Schedl 1957) comb. nov. (=Dendrochilus arundinarius Schedl 1957 syn. nov., =Hypothenemus bambusae Browne, 1970 syn. nov., =Dendrochilus filum Schedl, 1977 syn. nov.) (all from Dendrochilus), Afromicracis setifer (Schedl 1957) comb. nov. (Mimiocurus), Lanurgus longipilis (Schedl, 1958) comb. nov., Lanurgus pubescens (Schedl, 1961) comb. nov. (both from Traglostus), Diplotrichus catenatus (Schedl, 1953) comb. nov.,Diplotrichus elongatus (Schedl, 1950) comb. nov.,Diplotrichus euphorbia (Schedl, 1961) comb. nov.,Diplotrichus gracilis (Schedl, 1958) comb. nov.,Diplotrichus minor (Schedl, 1950) comb. nov (=Lanurgus frontalis Schedl, 1953 syn. Nov.), Diplotrichus obesus (Schedl, 1953) comb. nov., Diplotrichus pygmaeus (Schedl, 1965) comb. nov., Diplotrichus rugosipes (Schedl, 1961) comb. nov., Diplotrichus subdepressus (Schedl, 1965) comb. nov., Diplotrichus widdringtoniae (Schedl, 1962) comb. nov. (all from Lanurgus), Diplotrichus ignotus (Schedl, 1965) comb. nov. (Pseudomicracis), Pseudolanurgus harunganae (Schedl, 1961) comb. nov. (=Lanurgus cribrellus Schedl, 1965 syn. nov.), Pseudolanurgus bugekeae (Schedl, 1957) comb. nov. (both from Pseudomicracis), Pseudolanurgus minutissimus (Schedl, 1961) comb. nov. (Lanurgus), Pseudomicracis dispar (Schedl, 1961) comb. nov., Pseudomicracis tomicoides (Schedl, 1961) comb. nov. (both from Saurotocis). The following taxa were transferred to genera in other tribes: Acanthotomicus intermedius (Schedl, 1977) comb. nov., Xylocleptes villiersi (Lepesme, 1942) comb. nov. (both from Dendrochilus); Eidophelus agnathus (Schedl, 1942) comb. nov., and Eidophelus ciliatipennis (Schedl, 1979) comb. nov. (all from Miocryphalus). The following five species were included in Karlseniusgen. nov. (Trypophloeini): Karlsenius klainedoxae (Schedl, 1957) comb. nov., Karlsenius nitidum (Schedl, 1965) comb. nov., Karlsenius nigrinum (Schedl, 1957) comb. nov., and Karlsenius attenuatus (Eggers, 1935) comb. nov. (from Miocryphalus), and Karlsenius ghanaensis (Schedl, 1977) comb. nov. (from Eidophelus). A time-tree and biogeographical analysis suggested that Madagascar was colonized only once in Micracidini, from East Africa soon after the origin of the tribe in late Cretaceous. Multiple re-colonisations from Madagascar to the mainland have contributed to further diversification of a tribe which is otherwise highly restricted in geographical distribution.

A new genus and a new species of the tribe Haplotropidini Sergeev (Orthoptera: Acridoidea, Pamphagidae, Pamphaginae) with a key to the three genera of the tribe from China

This paper reports a new genus and a species of the tribe Haplotropidini Sergeev, 1995, i.e. Sulcohumpacris Yin, Yin et Cao gen. n. and Sulcohumpacris hebeiensis Yin, Yin et Cao sp. n. from Hebei Province, China. The new genus is similar to Humphaplotropis Xiao, Yin et Yin, 2013, but differs from the latter by the hump-formed pronotum along the median keel being deeply cut by hind sulcus and hence divided in two waves in lateral view, the anterior margin being acutely angular in the middle, the apex not reaching the hindmargin of the eyes, the frontal ridge being widened at the median ocellus, and the abdomen having large teeth along the median keel in lateral view. A key to the three genera of this Chinese tribe is given. The type specimens are deposited in the Museum of Hebei University, Baoding, China.

<p><strong>The availability, authorships and dates of tribal names in the Sigmodontinae (Rodentia, Cricetidae) current classification</strong></p>

Sigmodontinae, a diverse subfamily including 106 genera of American Rodents, is currently divided in eleven tribes that still need to be refined based on recently generated phylogenetic hypotheses. Several published names of tribes do not conform to one or more Rules of the International Code of Zoological Nomenclature. In particular, the first arrangement of Sigmodontinae genera in tribes has been overlooked, the different requirements for availability of names proposed before 1931 and after 1930 were not taken into account for at least five names, the requirement that a family-group name be used as valid in the publication where proposed, and the unavailability of names proposed conditionally after 1960 were also ignored on several occasions. Our analysis tries to disclose and fix such nomenclatural problems keeping current usage as much as possible. A new name is proposed for a tribe that currently has been designated only by an unavailable name.

Phylogeny of the tribe Marsdenieae (Apocynaceae), reinstatement of Ruehssia and the taxonomic treatment of the genus in Brazil

The Marsdenieae (Asclepiadoideae, Apocynaceae) comprise approximately 750 species and 26 accepted genera, half of which contain just one or two species. The tribe has been under-represented in phylogenetic studies to date, most of which have focussed on the ornamental paleotropical genus Hoya and related genera. American Marsdenieae are all currently classified in Marsdenia, a heterogeneous genus with about 150 species distributed in the tropics and subtropics and whose broad circumscription has been questioned for a long time. Here, we perform phylogenetic analyses comprising half of the tribe's genera and using two plastid (trnL-F and psbD-trnT) and two nuclear (ITS and ETS) regions. Our analyses show that the American species of Marsdenia are monophyletic but not closely related to M. tinctoria, the type of the genus. Thus, we reinstate Ruehssia H.Karst. to classify this American clade of Marsdenieae. We present a taxonomic revision of the genus in Brazil, with 42 species (one with two varieties) recognised. Other than R. macrophylla, the type of Ruehssia, all names are new combinations. One new synonym is proposed and 10 lectotypes and two neotypes are selected. All species are described and illustrated, together with comments and distribution maps for their occurrence in Brazil.

Re-evaluation of generic characters for Blinkworthia (Convolvulaceae) based on morphology and reproductive organ development

Blinkworthia, a tropical Asian genus of Convolvulaceae, was first characterized as an erect shrub with solitary flowers, three involucral bracts, and indehiscent, one-seeded berries. These three characters are diagnostic traits long used to distinguish Blinkworthia from other genera in the family. Blinkworthia lycioides was selected as a representative species for investigation of both morphology and ontogeny of the reproductive parts, while B. convolvuloides was only investigated morphologically. Nine stages based upon floral and fruit sizes were collected and prepared by the paraffin method for the developmental study. Examination of the developmental anatomy proved that some of the morphological characters have been misunderstood. In fact, none of the generic characters historically used to define the genus Blinkworthia are unique: the same character states are present in some species of Argyreia. This highlights that on morphological grounds it is not tenable to maintain Blinkworthia distinct from Argyreia. Pending the results from our ongoing molecular study of the genera in tribe Ipomoeeae a firm decision can be taken regarding the generic circumscription.

Chemistry of fruit wall and seed in Cyperaceae tribe Trilepideae

Transverse sections of the fruit walls and seeds from all four genera of family Cyperaceae tribe Trilepideae were investigated using SEM and energy dispersive x-ray analysis (EDXA) to determine the presence of different elements in different parts of the fruit wall and in phytin globules of the aleurone layer of the seed. This is a novel systematic method as previous investigations of elements in the fruit wall have focused almost exclusively on the morphology of silica phytoliths and not the actual occurrence of Si and other elements in the various parts of the fruit wall. In Cyperaceae seed presence of phytin globules rich in P, Mg and K in Cyperaceae seeds are here described and illustrated for the first time. Silicium-rich papillae were present in all epidermis cells of the pericarp in all genera in tribe Trilepideae, being an additional indication that the fruit-cover in this tribe is not an utricle but rather a pericarp. Although tribe Trilepideae is an early diverging clade within subfamily Cyperoideae, it has a pericarp typical of most of the subfamily, including the large genera Carex and Cyperus in the more derived clades.

Caryopsis micromorphological survey of the genus Themeda (Poaceae) and allied spathaceous genera in the Andropogoneae

A caryopsis micromorphological survey of 15 species of the genus Themeda Forssk. (Poaceae) and 4 species of allied spathaceous genera in tribe Andropogoneae allowed the recognition of 2 types of caryopses based on the ventral face and embryo shape for the first time. One kind of caryopsis had a concave ventral face with a grooved embryo, and the other kind of caryopsis had a flat ventral face with a keel-shaped embryo. Although the ventral face and embryo shapes had limited taxonomic value at the infrageneric level, the caryopsis shapes, embryo proportion, and sculpturing patterns were found to be valuable taxonomic characters at the interspecific level in Themeda . Consistent micromorphological characters of style base persistence and dorsiventral compression were observed for the first time in the caryopses of representative species of spathaceous genera in the Andropogoneae.

Re-establishment, synopsis and new combinations in the genus Bionia Mart. ex Benth. (Leguminosae: Papilionoideae)

Bionia Mart.ex Benth. is a small genus of tribe Phaseoleae subtribe Diocleinae (Leguminosae). It was considered as a synonym of Camptosema W.J.Hook. & Arn. for the last 160 years. The genus is re-established based on previous phylogenetic analysis of the subtribe Diocleinae which showed that Bionia is unrelated to Camptosema . Bionia is distinct from Camptosema by macromorphological and palynological characters and is restricted to eastern and central Brazil. New combinations are presented here, resulting in a circumscription of Bionia including five species.

New chromosome counts and evidence of polyploidy in Haageocereus and related genera in tribe Trichocereeae and other tribes of Cactaceae

Chromosome numbers for a total of 54 individuals representing 13 genera and 40 species of Cactaceae, mostly in tribe Trichocereeae, are reported. Five additional taxa examined belong to subfamily Opuntioideae and other tribes of Cactoideae (Browningieae, Pachycereeae, Notocacteae, and Cereeae). Among Trichocereeae, counts for 35 taxa in eight genera are reported, with half of these (17 species) for the genus Haageocereus. These are the first chromosome numbers reported for 36 of the 40 taxa examined, as well as the first counts for the genus Haageocereus. Both diploid and polyploid counts were obtained. Twenty nine species were diploid with 2n=2x=22. Polyploid counts were obtained from the genera Espostoa, Cleistocactus, Haageocereus, and Weberbauerocereus; we detected one triploid (2n=3x=33), nine tetraploids (2n=4x=44), one hexaploid (2n=6x=66), and three octoploids (2n=8x=88). In two cases, different counts were recorded for different individuals of the same species (Espostoa lanata, with 2n=22, 44, and 66; and Weberbauerocereus rauhii, with 2n=44 and 88). These are the first reported polyploid counts for Haageocereus, Cleistocactus, and Espostoa. Our counts support the hypothesis that polyploidy and hybridization have played prominent roles in the evolution of Haageocereus, Weberbauerocereus, and other Trichocereeae.

Phylogenetics of Andropogoneae (Poaceae: Panicoideae) Based on Nuclear Ribosomal Internal Transcribed Spacer and Chloroplast trnL–F Sequences

Phylogenetic relationships among 85 species representing 35 genera in the grass tribe Andropogoneae were estimated from maximum parsimony and Bayesian analyses of nuclear ITS and chloroplast trnL-F DNA sequences. Ten of the 11 subtribes recognized by Clayton and Renvoize (1986) were sampled. Independent analyses of ITS and trnL-F yielded mostly congruent, though not well resolved, topologies. Arundinella is sister to Andropogoneae in the trnL-F phylogeny and is nested within the tribe in the ITS and combined data trees. Tristachya is sister to Andropogoneae + Arundinella in the ITS phylogeny. Four clades are common to the ITS and trnL-F phylogenies and the trees from the combined data set. Clade A consists of Andrapogon, Diectomis, Hyparrhenia, Hyperthelia, and Schizachyrium. Within this clade, Andropogon distachyos, Hyparrhenia, and Hyperthelia form clade C. Clade B consists of Bothriochloa, Capillipedium, and Dichanthium, and clade D includes Chrysopogon and Vetiveria. Analysis of the combined data resulted in an unsupported larger clade comprising clades A and B plus Cymbopogon, and a sister clade of Heteropogon, Iseilema, and Themedu. This larger clade is similar to the core Andropogoneae clade previously reported (Spangler et al. 1999; Mathews et al. 2002). Based on our sample, which represents 41% of the tribe's genera, most of Clayton and Renvoize's (1986) subtribes are not monophyletic.

Distribution and diagnostic characters of Nassella (Poaceae: Stipeae)

SummaryBarkworth, M. E. & Torres, M. A.: Distribution and diagnostic characters of Nassella (Poaceae: Stipeae). – Taxon 50: 439–468. 2001. – ISSN 0040‐0262.Nassella sensu lato includes 116 species, making it one of the largest genera in tribe Stipeae. Argentina has the largest number of species, 72, with the greatest concentration being in the northwestern part of the country. Bolivia, Chile, and Uruguay have 26, 27, and 27 species, respectively. Other South American countries in which the genus is present are Brazil (18 species), Colombia (8), Ecuador (9), Paraguay (4), Peru (18), and Venezuela (2). Guatemala has two species, but Costa Rica only one. Mexico has eight native species, five of which also grow in the United States. One additional species grows in both the United States and Canada. Sixty species are known only from one country; one species, N. mexicana, grows in eight countries. Several new distribution records are documented: N. caespitosa, N. elata, N. leptothera and N. punensis for Bolivia, N. pauciciliata and N. spegazzinii for Brazil, N. airoides, N. argentinensis, N. spegazzinii for Paraguay, and N. tucumana (= N. asperifolia) for Peru. Three new combinations are presented: N. burkartii, N. ligularis, and N. quinqueciliata. Two recently transferred species, N. barrancaensis and N. brachychaeta, are excluded from the genus and N. asperifolia, N. bonariensis, and N. amethystina are placed in synonymy. Tables summarising the distribution of Nassella and its morphological variation are presented.

Morfo-anatomia do embrião de leguminosas arbóreas nativas

Objetivando caracterizar os eixos embrionarios de sementes de especies de Fabaceae e fornecer subsidios para trabalhos de sistematica e filogenia desta familia, foram estudados aspectos morfologicos e anatomicos dos embrioes, especialmente dos eixos embrionarios, de 15 especies arboreas nativas, buscando correlacoes entre sua estrutura e a afinidade entre os diferentes generos e destes nas tribos. Observaram-se cotiledones foliaceos nas especies de Caesalpinioideae, carnosos nas Faboideae e dos dois tipos nas Mimosoideae. Os eixos embrionarios variaram de curtos a longos, sendo sempre retos nas especies de Caesalpinioideae e Mimosoideae; nas Faboideae, encontraram-se eixos embrionarios curvos ou inclinados. A plumula variou de indiferenciada a diferenciada, o primeiro tipo ocorrendo em especies sem epicotilo e o ultimo disposto sobre epicotilo alongado. Anatomicamente, a protoderme se mostrou indiferenciada na maioria das especies, podendo ocorrer tricomas em diferenciacao (Caesalpinia leiostachya, Centrolobium tomentosum e Anadenanthera macrocarpa), papilas (Platypodium elegans) e tricomas tectores e glandulares diferenciados (Inga uruguensis). O procâmbio se manteve indiferenciado. O meristema fundamental mostrou acumulo de amido em todas as especies, ocorrendo drusas em Peltophorum dubium e cristais poliedricos isolados em Inga uruguensis e em Lonchocarpus muehlbergianus. Esta ultima especie apresentou, ainda, estruturas secretoras na regiao do no cotiledonar.