Redescription of two species of Microcyclops (Copepoda, Cyclopoida) and use of ordination models to classify American species Author Gutierrez-Aguirre, Martha Angelica https://orcid.org/0000-0002-9329-820X Universidad Autonoma del Estado de Quintana Roo (UQROO), Campus Cozumel, Av. Andres Quintana Roo s / n, 77600, Cozumel, Quintana Roo, Mexico marguta71@gmail.com Author Cervantes-Martinez, Adrian https://orcid.org/0000-0001-8366-4803 Universidad Autonoma del Estado de Quintana Roo (UQROO), Campus Cozumel, Av. Andres Quintana Roo s / n, 77600, Cozumel, Quintana Roo, Mexico text ZooKeys 2023 2023-08-03 1173 111 130 http://dx.doi.org/10.3897/zookeys.1173.97827 journal article http://dx.doi.org/10.3897/zookeys.1173.97827 1313-2970-1173-111 89FB4EB463E34A78A3EFF882CF158283 5D0D5F10850554C4A229A2D8BE3EBAAD Microcyclops minor Dussart, 1984 Fig. 3 Microcyclops anceps var. minor Dussart, 1984: 57, fig. 17. Material examined. Holotype . Dissected , adult female on slide labelled as: Microcyclops anceps var. minor [nov. var.]. Charca I , near Unare river at Clarines ( Venezuela ), 13.4.1981 , Collector Bernard Dussart , and det. B. Dussart (MNHN Cp-673). Redescription based on the holotype. Dorsal margin of prosomal somites smooth (unfigured). Because of the position of the specimen, it was not possible to observe the buccal appendages. As per the illustration by Dussart (1984) , basipodites of P1 with short hair-like setules but without spine on medial margins; coxa with one row of short setules along lateral margins. Basipodite of P4 with short hair-like setules on medial margin (Fig. 3A ); P4 intercoxal sclerite rectangular with long setules along distal margin. As illustrated by Dussart (1984) Enp2P4 is 2.46 x as long as wide; medial spine 1.95 x as long as lateral spine and 0.73 x as long as the segment. Figure 3. Microcyclops minor . Adult female (MNHN-Cp673) A fourth leg, medial area: intercoxal sclerite, Bsp, and Enp1 B urosome, dorsal C terminal caudal setae. Scale bars 50 µm . Fifth pediger bare, with dorsal hyaline membrane smooth posteriorly; P5 is a cylindrical free segment that bears one apical seta and one projected medial spinule (Fig. 3B ). Free segment of P5, 2.0 x as long as wide and 0.34 x as long as apical seta. Length to width ratio of caudal ramus is 3.15, medial margin naked; no spinules at base of lateral caudal setae, but spinules present at base of outermost terminal caudal setae (Fig. 3B ). Short spinules along all the posterior margin of anal somite; lateral caudal seta inserted at 78% of caudal ramus. Relative lengths of terminal caudal setae from outermost to innermost caudal seta are 1: 6.2: 8.1: 2.33 (Fig. 3C ). Due to the differential morphological characteristics previously described, we propose to elevate the status of M. minor to the species level.