A new genus of Parastenocarididae Chappuis, 1940 (Copepoda: Harpacticoida) from the Amazonian Region, Brazil, with close affinity to <i>Murunducaris</i> Reid, 1994

Corgosinho, Paulo Henrique Costa; Rocha, Carlos Eduardo Falavigna da; Arbizu, Pedro Martínez; Santos-Silva, Edinaldo Nelson dos

doi:10.1590/2358-2936e2021015

Acessibilidade / Reportar erro

Brasil

Español English

sumário « anterior atual seguinte »

Sumário

Original Article • Nauplius 29 • 2021 • https://doi.org/10.1590/2358-2936e2021015 copy

A new genus of Parastenocarididae Chappuis, 1940 (Copepoda: Harpacticoida) from the Amazonian Region, Brazil, with close affinity to Murunducaris Reid, 1994

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

Santaremicaris gen. nov. is proposed to accommodate Santaremicaris amazonensis sp. nov., a new species collected by Noodt from the hyporheic zone of the Amazonas River at Santarém, Brazil, and Parastenocaris santaremensis Noodt, 1963, which is redescribed and designated as the type species of the new genus. The new genus is recorded also from several localities of the Amazonian hydrographic basin. Santaremicaris gen. nov. is well supported by clear autapomorphies, e.g., 1) the absence of distal spinules on the endopod of the second swimming leg of the male, which is ornamented with strong outer spinules along the first 2/3 of the segment and armed with a long distal seta the insertion area of which covers almost the whole width of the segment; 2) the presence of a triangular, short and strongly sclerotized endopod on the fourth swimming leg of the male; and 3) the presence of a long and slim male fifth leg ending in a long distal spiniform process, with irregular margins, armed with only three setigerous elements on the outer margin, and reaching the middle of the subsequent urosomal segment or beyond it. The new genus is closely related to Murunducaris Reid, 1994, with males sharing conspicuous ornamentation on the inner margin of the first swimming leg basis, represented either by an enlarged spinule accompanied by minute accessory spinules or by a row of strong spinules. In addition, the males of both Murunducaris and Santaremicaris gen. nov. share an enlarged intercoxal sclerite with a median process on the fifth leg.

Keywords
Amazonian basin; Fontinalicaridinae; groundwater; hyporheos; Neotropics

Characters	Santaremicaris santaremensis comb. nov.	Santaremicaris amazonensis sp. nov.
Length of male	325µm	255µm
Ornamentation of the basis of P1	Strong spinule with marginal smaller ones.	Row of subequal long spinules.
Ornamentation of the P1 enp1	Irregular rows of spinules on the inner and outer margins.	Longitudinal row of subequal spinules on the inner and outer margins.
Ornamentation of the P2 enp	Spinules shorter than in the sister species	Spinules longer than in the sister species
Ornamentation of the coxa of P3	Present	Absent
Ornamentation of the basis of P3	Inner claw-like spinule close to the basis/coxa articulation, proximal to a curved row of spinules decreasing in size from proximal to distal region.	Only a V-shaped row of equal spinules on inner margin.
Shape and ornamentation of P3 exp-1	Straight and smooth on the inner and outer margin.	Irregular margin with a proximal tube pore and 2 proximal spinules on the outer margin.
Shape and ornamentation of the apophysis	Spatuliform and smooth.	Elongate, with a sharp edge and a distal hyaline lamella.
Length and shape of P3 thumb	Longer than apophysis, knife-like.	Shorter than apophysis, spiniform with an inner hyaline lamina.
Fine ornamentation of the P4 exp3	With a row of fine spinules in the distal outer margin.	With a strong and cuneiform spinule in the distal outer margin.
P4 enp ornamentation on the outer margin	Absent	Present
P4 enp sclerotization	Along inner margin, proximal margin and portion of the outer margin.	Along the inner margin.
Proximal row of spinules on the inner margin of the P4 exp1	Less developed than in the sister species.	More developed than in the sister species.
Distal row of spinules on the inner margin of the P4 exp1	More developed than in the sister species.	Less developed than in the sister species.
Shape of P5 intercoxal sclerite process	Claviform	Linguiform
P5 shape and ornamentation	With a proximal hump on the outer margin followed by smooth outer margin; distally ending in tapering distal process, with two or three spinules on the midline of the inner margin, with two spinules proximally inserted, close to an irregular inner margin..	Irregular outer margin, distal spiniform process thinner than in the sister species, more or less smooth inner margin with 5 spinules along the midline.

Sociedade Brasileira de Carcinologia Instituto de Biociências, UNESP, Campus Botucatu, Rua Professor Doutor Antônio Celso Wagner Zanin, 250 , Botucatu, SP, 18618-689 - Botucatu - SP - Brazil
E-mail: editor.nauplius@gmail.com

Acompanhe os números deste periódico no seu leitor de RSS

[1] CORRESPONDING AUTHOR
Paulo Henrique Costa Corgosinho pcorgo@gmail.com