Genus

About: Genus is a research topic. Over the lifetime, 68921 publications have been published within this topic receiving 590966 citations. The topic is also known as: monospecies genus & genus (zoology).

rbcL gene sequences reveal relationships among north-east Pacific species of Porphyra (Bangiales, Rhodophyta) and a new species, P. aestivalis

Abstract: SUMMARY Phylogenetic analyses of the rbcL (chloroplast Rubisco large subunit) gene from 23 newly sequenced species of Porphyra, primarily from the north-east Pacific, one Bangia and previously published sequences from both genera resolve relationships among most species of Porphyra and reveal five clades of species with Porphyra-type morphologies among a number of Bangia lineages: (1) P. papenfussii V. Krishnam; (2) P. mumfordii S. C. Lindstrom et K. M. Cole and P. rediviva Stiller et Waaland together with a group of north Atlantic species, including the type of the genus, P. purpurea (Wahl-enb.) C. Agardh; (3) P. cuneiformis (Setch. et Hus) V. Krishnam., P. occidentalis Setch. et Hus, P. schizo-phylla Hollenb., and P. variegata (Kjellm.) Kjellm. and their Atlantic sibling species, all distromatic; (4) P. aestivalis sp. nov. and its north Atlantic sibling, P. birdiae C. D. Neefus et A. C. Mathieson; and (5) a speciose clade containing both Pacific and Atlantic representatives. Close relationships are confirmed between sibling species previously identified by iso-zymes, morphology and chromosomal features. The morphologically similar dioecious P. pseudolanceolata V. Krishnam., P. conwayae (S. C. Lindstrom et K. M. Cole) stat. nov., and P. lanceolata (Setch. et Hus) G. M. Smith occur in a strongly supported subclade in clade 5 together with the monoecious P. fallax S. C. Lindstrom et K. M. Cole. Results presented here highlight the need for intensive taxon sampling and for examination of different parts of the genome to understand more fully relationships among species and higher level taxa in the Bangiales.

A skeletal revision of Nepenthes (Nepenthaceae)

Abstract: A skeletal world revision of the genus is presented to accompany a family account for Flora Malesiana. 82 species are recognised, of which 74 occur in the Malesiana region. Six species are described as new, one species is raised from infraspecific status, and five species are restored from synonymy. Many names are typified for the first time. Three widespread, or locally abundant hybrids are also included. Full descriptions are given for new (6) or recircumscribed (7) species, and emended descriptions of species are given where necessary (9). Critical notes are given for all the species. Little known and excluded species are discussed. An index to all published species names and an index of exsiccatae is given.

Systematic Observations on North American Scorpionida with a Key and Checklist of the Families and Genera

Abstract: The phylogenetic associations of North American scorpion genera are examined. Several taxonomic changes are supported by new hypotheses of relationship. The subfamily Syntropinae is synonymized under Vaejovinae. Chactidae and Vaejovidae are restricted to their nominate subfamilies. Superstitioninae, Euscorpiinae, and Scorpiopsinae are raised to family rank. The subfamily Megacorminae is synonymized under Euscorpiinae. Anuroctonus Thorell and Nullibrotheas Williams are removed from Vaejovidae and placed in Iuridae and Chactidae, respectively. Troglotayosicus Lourenco and Belisarius Simon are transferred from Chactidae to Superstitionidae. Twelve species are transferred from Vaejovis Koch to Pseudouroctonus Stahnke. The diplocentrid genus Bioculus Stahnke is resurrected to contain four species from Baja California Sur, Mexico, that were traditionally placed in Didymocentrus Kraepelin. Paruroctonus (Smeringurus) Haradon is raised to the rank of genus. An illustrated key and annotated checklist are provided for the identification of the seven families and 25 genera of North American scorpions.