Notodiaptomus cearensis (Wright, 1936)

Perbiche-Neves, Gilmar, Boxshall, Geoffrey Allan, Previattelli, Daniel, Nogueira, Marcos Gomes & da Rocha, Carlos Eduardo Falavigna, 2015, Identification guide to some Diaptomid species (Crustacea, Copepoda, Calanoida, Diaptomidae) of " de la Plata " River Basin (South America), ZooKeys 497, pp. 1-111 : 28

Taxon classification Animalia Calanoida Diaptomidae

Notodiaptomus cearensis (Wright, 1936) Figs 32, 33, 34

Diaptomus cearensis Wright, 1936

Diagnosis.

Adult male, body length 1008 µm. Ped4 lacking row of spinules along posterior margin. First segment of A1R unornamented (lacking typical spinule row) (Fig. 32B); modified seta of A1R on segment 13 forming strong process with bifid apex and reaching middle of segment 14 (Fig. 32C). Segment 11 of A1L with 2 setae (Fig. 32D). Right BspP5 slightly longer than wide with longitudinal groove ornamented with small surface granules (Fig. 32A); longitudinal groove also present on Exp2P5; lateral spine of Exp2P5 short and straight, length approximately 1/6 (16%) of length of terminal claw, inserted sub-terminally.

Adult female, body length 1485 µm. Ped4 and Ped5 fused, without trace of suture; lateral wings symmetrical, both with two pairs of sensillae (Fig. 33A), one at distal tip, the other close to inner margin of wing. GS almost symmetrical, 1.3 times longer than wide; slightly dilated anteriorly, with swelling on right side slightly more marked than on left, both swellings with apical sensilla; left sensilla aligned perpendicular to longitudinal axis of body, right sensilla directed slightly anteriorly. P5 symmetrical (Fig. 33B), with short conical process at distal corner of Cx bearing triangular sensilla, longer than wide; BspP5 with long outer seta, almost reaching distal margin of Exp1P5; EnpP5 2-segmented, about as long as internal margin of Exp1P5. Exp 3-segmented; lateral spine of Exp2P5 similar in length to external margin of Exp3P5; external seta of Exp3 1/3 as long as internal seta; internal seta almost reaching apex of terminal claw.

Remarks.

The illustrated specimens were collected from the Parnaíba River at Emborcação Reservoir (Fig. 34), where this species co-occurred with at least two other diaptomids: Argyrodiaptomus azevedoi and Notodiaptomus iheringi (Wright, 1935). This species has been widely reported from across the north and northeast of Brazil and in Venezuela. In de la Plata river basin, Tundisi and Matsumura-Tundisi (1994) found this species in Barra Bonita Reservoir. This species can be confused with Notodiaptomus iheringi , but differs in the setal formula of some segments of the A1, in the absence of a row of spinules on the first segment of A1R, and in having a smaller body than Notodiaptomus iheringi .