A NEW SPECIES OF Rhacodiaptomus Kiefer, 1936, FROM THE BRAZILIAN AMAZON (CRUSTACEA:COPEPODA: CALANOIDA)

Abstract

-A new species of Calanoid copepod, Rhacodiaptomus besti, is described from material collected in the Igarapé São Pedro, Rio Jamari, State of Rondônia, and Lago Amanã, Rio Japurá, State of Amazonas, in Western Amazonia. A detailed morphological analysis of the species was undertaken in order to provide a basis for future studies on inter and intrageneric relationships.

Biological Systematic of the genusNotodiaptomusKiefer 1936 (Copepoda: Calanoida)

“…Although these more inclusive characteristics of Kiefer (1956) were not unprecedented, the addition of others less comprehensive to current species compose an interesting morphological set for Notodiaptomus: (1c) female P5 endopod 1-segmented, (4c) posterior protrusion on basis of male P5R, and (5c) exopod 1 longer than wide on male P5R. The simultaneous observation of these attributes, isolated among groups close to the genus (e.g., Walter, 1994;Santos-Silva & Robertson, 1993;Perbiche-Neves et al, 2011;Previattelli et al, 2015), evidence organisms in Notodiaptomus that converge these attributes. They are from the species: N. amazonicus, N.…”

“…BRAZIL. Amazonas: Joanico Lake, Careiro Island, near to Manaus (Herbst, 1967); Janauari Lake, Negro River, near to Manaus (Brandorff, 1972;1973b); Paraná of the Curari; Lake of the Rei, Careiro Island, Amazonas River; Manacapuru River, Lake of the Piranha, and Paraná do Piranha (Brandorff, 1972); Lake Calado, Amazonas River, near to Manacapuru City (Brandorff, 1972;Santos-Silva, 1991); Lake Jacaretinga, Amazonas River (Hardy, 1980); Lake Grande, Amazonas River, 03°22'S, 60°35W (Carvalho, 1983); Lake Lua Nova, Acre River (Sendacz & Melo Costa, 1991); Amanã Lake, Japurá River (Santos-Silva & Robertson, 1993). Pará: vicinity of Santarém, probably in the Tapajós River (Wright, 1927); Grande Curuai Lake, in front of Fazenda Nova Itália (Brandorff, 1972;1973b), and in front of Caraubal, Amazonas River; Tapajós River at the Santarém City; Lake Salgado, Boi, and Cabeceira do Molha Headwaters; Jurucui Lake, Tapajós River, near to the village of Alter-do-Chão; Amazonas River, near to Santarém; Paraná of the Tapará, near to Santarém (Brandorff, 1972).…”

“…Pará: vicinity of Santarém, probably in the Tapajós River (Wright, 1927); Grande Curuai Lake, in front of Fazenda Nova Itália (Brandorff, 1972;1973b), and in front of Caraubal, Amazonas River; Tapajós River at the Santarém City; Lake Salgado, Boi, and Cabeceira do Molha Headwaters; Jurucui Lake, Tapajós River, near to the village of Alter-do-Chão; Amazonas River, near to Santarém; Paraná of the Tapará, near to Santarém (Brandorff, 1972). Rondônia: Calama, Madeira River (Wright, 1927); São Pedro Stream, 09°36'S, 63°37'W (Santos-Silva & Robertson, 1993). Mato Grosso do Sul: southern Pantanal, region of Corumbá, Paraguay River: near to Marinha Ladário, near to Port, near to Rabicho, site 2 near airport (Corumbá), Baía de Carandazal (baía 29) at Fazenda Nhumirim (18°59'S, 56°39'W), Jacadigo bay (19°01'S, 57°41'W) (Reid & Moreno, 1990).…”

“…In Wright 1935 the observation of the fifth left leg (P5L) of males with narrowly segmented exopods and setules pad (4a) remains for all current Notodiaptomus organisms. However, it can also be found in organisms of the genus Rhacodiaptomus (e.g., Santos-Silva & Robertson, 1993), Aspinus (e.g., Brandorff, 1973), andArgyrodiaptomus (e.g., Perbiche-Neves et al, 2011) and does not represent a defining attribute, unfortunately. Despite this, another male attribute with less frequency of sharing seem to contribute to gender identity: (3a) angular or rounded inner prominence on exopod 2 of the right fifth leg, treated here as an internal-distal ridge posterior on exopod 2 of the right fifth leg (P5R) (fig.…”

A new species of Notodiaptomus from the Ecuadorian Andes (Copepoda, Calanoida, Diaptomidae)

“…Tumeodiaptomus Dussart, 1979, and some members of Rhacodiaptomus Kiefer, 1936 (e.g. Rhacodiaptomus besti Santos-Silva & Robertson, 1993, and in a lesser extent R. insolitus (Wright, 1927) or R. retroflexus Brandorff, 1973), show somewhat similar structures but with only one of the two wings hypertrophied (see Dussart 1979; Santos-Silva and Robertson 1993). Nevertheless, at least Tumeodiaptomus appears distantly related to Notodiaptomus in Previatelli’s (2010) analysis of the phylogenetic relationships of Neotropical diaptomids.…”