New Diaptomidae records (Crustacea: Copepoda: Calanoida: Diaptomidae) in the Neotropical region

TIn this study we present 208 new diaptomids records, including 36 species from 10 genera. They are the result of new samplings as well as of the revision of samples from previous surveys from various localities in the Neotropical Region. In an attempt to clear elucidate about the species ranges we gathered all biogeographically important data and present them here, with comments about the relevance of each record to the understanding of the distribution of the group. © 2013 Check List and Authors

Historical biogeography of the neotropical Diaptomidae (Crustacea:Copepoda)

Introduction: Diaptomid copepods are prevalent throughout continental waters of the Neotropics, yet little is\ud known about their biogeography. In this study we investigate the main biogeographical patterns among the\ud neotropical freshwater diaptomid copepods using Parsimony Analysis of Endemicity (PAE) based on species records\ud within ecoregions. In addition, we assess potential environmental correlates and limits for species richness.\ud Results: PAE was efficient in identifying general areas of endemism. Moreover, only ecoregion area showed a\ud significant correlation with diaptomid species richness, although climatic factors were shown to provide possible\ud upper limits to the species richness in a given ecoregion.\ud Conclusion: The main patterns of endemism in neotropical freshwater diaptomid copepods are highly congruent\ud with other freshwater taxa, suggesting a strong historical signal in determining the distribution of the family in the\ud Neotropics.We would like to thank to Professor Edinaldo Nelson dos Santos Silva (INPA, Brazil) for useful insight during this study. We also thank FAPESP (process 2008/02015-7, 2009/00014-6, 2011/18358-3) for financial support to GPN; and CNPq for financial support to DP (process 141702/2006-0) and MRP (process 304897/2012-4)

A new genus of Parastenocarididae (Copepoda, Harpacticoida) from the Tocantins River basin (Goiás, Brazil), and a phylogenetic analysis of the Parastenocaridinae

Eirinicaris antonioi gen. et sp. n. (Parastenocaridinae) is described from the Brazilian rocky savannas, an ecosystem under heavy anthropogenic pressure. The subfamily is distributed worldwide, with representatives in Africa, Asia, Australia, Europe, and North America. This is the first time a non-Remaneicaris Parastenocaridinae is described from a Neotropical region indicating that Parastenocaridinae species were already present in a vast geographical area, before the split of the Gondwana. The new taxon is included within the subfamily Parastenocaridinae based on the following characters: 1) segments 5, 6, and 7 of the male antennules forming a functional unit for clasping the female; 2) segment 7 with small process at the inner margin, forming an incipient "pocket-knife" structure with segment 6; 3) last segment pointing medially when closed; 4) the endopod of female leg 3 one-segmented and spiniform, without distal seta; 5) the apophysis and terminal seta of the exopod of male leg 3 are fused; 6) the genital field is rectangular and much broader than the height in the female; 7) the group of three lateral setae I, II, and III of the furca and the dorsal seta are situated at the same level in the female; and 8) the basis of leg 1 has an inner seta. The new taxon can be distinguished from all other Parastenocaridinae genera by the unique sexually dimorphic telson and furca. In the male, the dorsal seta is inserted at the midlength of the furca and setae I, II, and III are displaced anteroventrally. A phylogenetic analysis of the subfamily Parastenocaridinae is given based on the description of the type species of each genus and available descriptions of all Parastenocaridinae species. Eirinicaris gen. n. is the sister taxon of a clade formed by Kinnecaris and Monodicaris, sharing with them the long male and female leg 5 with a long spiniform process, and with Kinnecaris, a distal pore on the spiniform process. © Paulo H.C. Corgosinho et al

Sistematica do genero Argyrodiaptomus Brehm, 1933(Crustacea: Copepoda: Diaptomidae).

The genus Argyrodiaptomus was studied with the description of a new specie and comparison with the other species. 369 items were listed using the DELTA program for the production of descriptions, identification keys and a characters matrix. 72 characters were more informative, and the polarization of them were made a priori. Notodiaptomus deitersi e Aspinus acicularis were used as outer groups. The matrix was converted from the DELTA format to HENNIG86 and Nexus formats. Then the programs PAUP and Winclada were used to process the matrix with a heuristic search for the most parsimonious tree. The analysis resulted in one most parsimonious tree, with the following phylogenetic statistic indexes: (L)=109, (CI)=0.954 and (RI)=0,954. The monophily of the group was sustained by 23 synapomorphies, and the resulting phylogenetic relationships between species of Argyrodiaptomus are: (((A. azevedoi, A. robertsonae, A. nhumirim e A. sp.) ((A. furcatus, A. macrochaetus) (A. argentinus, A. denticulatus))).O gênero Argyrodiaptomus foi estudado a partir da descrição de uma nova espécie e comparação desta com exemplares das espécies existentes. Foram listados 369 ítens ou atributos de cada espécie com o auxílio do programa DELTA. A partir destes ítens foram geradas descrições para as espécies e chaves de identificação (dicotômica e interativa, para machos e fêmeas), além de uma matriz com caracteres 72 informativos, usados para a análise filogenética. A matriz foi exportada do formato DELTA para os formatos HENNIG86 e Nexus, com a polarização a priori dos caracteres. A análise computacional foi feita com os programas PAUP e Winclada, com a busca heurística pela árvore mais parcimoniosa. Os grupos externos utilizados foram Notodiaptomus deitersi e Aspinus acicularis. A busca revelou uma árvore, com com os seguintes índices statísticos filogenéticos: comprimento (L)=109, índice de consistência (CI)=0.954 e índice de retenção (RI)=0,954. A monofilia do grupo foi corroborada por 23 sinapomorfias. Ainda entre as espécies de Argyrodiaptomus quatro grupos monofiléticos estão presentes, sendo estas as suas relações filogenéticas: (((A. azevedoi, A. robertsonae, A. nhumirim e A. sp.) ((A. furcatus e A. macrochaetus) (A. argentinus e A. denticulatus)))

A new argyrodiaptomus (Copepoda: Calanoida: Diaptomidae) from the southwestern Brazilian Amazon

Argyrodiaptomus paggii n. sp. is described from specimens collected in the Igarapé Boa Esperança, in the vicinity of the Samuel Reservoir, State of Rondônia, Brazil. The new species differs from its congeners by the following autapomorphies: (1) Schmeil's organ large at apex, constricted at medial portion; (2) row of setules on the outer margin of basis first leg; (3) a peculiar disposition and structure of the spinules on the inner border of the basis of male's left and right fifth leg; and (4) female's second urosomite partially fused and telescoped into the genital somite. We provide a discussion about some aspects of the morphology and geographical distribution of all members of the genus. Copyright © 2007 Magnolia Press

A new Argyrodiaptomus (Copepoda: Calanoida: Diaptomidae) from the southwestern Brazilian Amazon

Previattelli, Daniel, Santos-Silva, Edinaldo Nelson Dos (2007): A new Argyrodiaptomus (Copepoda: Calanoida: Diaptomidae) from the southwestern Brazilian Amazon. Zootaxa 1518: 1-29, DOI: 10.5281/zenodo.17735

Record of Argyrodiaptomus bergi (Crustacea: Copepoda: Calanoida) after 36 years and first record in Brazil

The first record of Argyrodiaptomus bergi (Richard, 1897) from a small roadside pool at high altitude in the southern region of Brazil is presented. This is the ninth record of this species in South America (previously known from Argentina and Uruguay) since its original description, and a new occurrence after 36 years, extending its known distribution to the northeast. The environments where this species was found differ sharply, and possible explanations include the loss of habitat, high species selectivity or deficient sampling efforts. An additional description is provided, with scanning electron microscopy (SEM) photomicrographs and line drawings. Similarly to other species of Argyrodiaptomus, such as Argyrodiaptomus falcifer (Daday, 1905), Argyrodiaptomus denticulatus (Pesta, 1927) and Argyrodiaptomus granulosus (Brehm, 1933), this species shows a restricted distribution in the lower stretches of the Paraná and Uruguay rivers, particularly in small pools. The importance of better understanding the dynamics and diversity of small water bodies is discussed