Species Card of Copepod
Calanoida ( Order )
    Pseudocyclopoidea ( Superfamily )
        Pseudocyclopidae ( Family )
            Pseudocyclops ( Genus )
Pseudocyclops constanzoi  Baviera, Crescenti & Zagami, 2007   (F)
Baviera, Crescenti & Zagami, 2007 (p.571, Descr.F, figs.F)
Species Pseudocyclops constanzoi - Plate 1 of morphological figuresIssued from : C. Baviera, N. Crescenti & G. Zagami in Crustaceana, 2007, 80 (5). [p.572, Fig. 1].
Female (from Faro lake, NE Sicily): A, habitus (dorsal); B, pedigerous somites 2-5 and genital double-simite (lateral); C, A1 (lateral); D, A2 endopod (lateral ) with exopod position indicated by arrow.

- Prosome compact, oval in dorsal view.
- Rostrum with large base, fused to cephalon, protruding ventrally.
- A1 with 17 segments, armature element setae and aesthetascs as follow: 13 + 3a; 2; 2; 4; 2; 2; 2; 3; 2; 2; 2; 2; 2; 2; 4; 2; 5+ 2a.
- Cephalosome and 1st pegiger somite separate, 4th and 5th pediger somites separate.
- 2nd pediger somite with ventrolateral posterior corner produced into acute process.
- 4th and 5th pediger somites with pointed epimeral margins dorsolaterally.
- 5th pediger somite characterized by a tooth visible in lateral view.
- Urosome 4-segmented.
- Genital double-somite symmetrical, with gonopore and copulatory pore opening in common longitudinal slit on ventral side and with postero-ventral edge denticulate.
- 2nd urosomal somite with denticulate edge around posterior margin.
- 3rd urosomal somite with posterior hyaline frill and with distal margin denticulate;
- Anal somite very small, without ornamentation, almost telescoped into 3rd somite.
- Caudal ramus bearing 6 setae, sera II spiniform and seta V longest.

Species Pseudocyclops constanzoi - Plate 2 of morphological figuresIssued from : C. Baviera, N. Crescenti & G. Zagami in Crustaceana, 2007, 80 (5). [p.573, Fig. 2, A-D].
Female: A, Md (lateral); B, Mx1 (lateral); C, Mx2 (lateral); D, Mxp (lateral).
Scale bar for all figures.

- A2 biramous, coxa and basis clearly separate, both bearing 1 seta; endopod 3-segmented, 1st segment with 2 setae, 2nd segment with 8 setae, 3rd segment with 7 setae apically; exopod of both sides were lost.
- Md with cutting edge of gnathobase bearing 7 cuspidate teeth; palp biramous, basis with 2 setae, endopod bearing 4 setae on 1st segment and 10 setae on distal margin of 2nd segment; exopod 4-segmented bearing 1, 1, 1, 3 setae, respectively.
- Mx1 well developed; praecoxal arthrite bearing 9 strong spines and 5 submarginal slender serae; coxal endite with 3 setae; coxal epipodite with 6 setae; basis with 1 short seta (representing exite), 4 setae each on proximal and distal endites; endopod bearing a total of 16 setae; exopod bearing 11 setae along disto-lateral margin.
- Mx2 with praecoxa proximal endite bearing 5 long setae and 1 rudimentary element, distal endite with 3 setae; both coxal endites with 3 setae. Basis and 1st endopodal segment fused to form allobasis, bearing 7 setae; endopod reduced, indistinctly segmented bearing 7 setae.
- Mxp with syncoxa bearing 1, 2, 3 setae representing praecoxal and coxal endites; basis with 3 setae on proximal margin and 2 setae on distal margin, derived from incorporated 1st endopodal segment. Endopod 5-segmented, 1st and 2nd segments each bearing 4 setae; 3rd segment with 3 setae, 4th segment with 3 inner and 1 outer setae, 5th segment with 4 setae.

Species Pseudocyclops constanzoi - Plate 3 of morphological figuresIssued from : C. Baviera, N. Crescenti & G. Zagami in Crustaceana, 2007, 80 (5). [p.573, Fig. 2, E, F].
Female: E, P1 (anterior); F, P2 (anterioir).
Scale bar for E and F.

Species Pseudocyclops constanzoi - Plate 4 of morphological figuresIssued from : C. Baviera, N. Crescenti & G. Zagami in Crustaceana, 2007, 80 (5). [p.575, Fig. 3].
Female: A, P3 (anterior); B, P4 (anterior); C, P5 (anterior).

Nota: P5 with unarmed coxa; basis with an acute process on inner margin; exopod and endopod with 3 and 2 segments, respectively; 1st exopodal segment bearing 1 spine, 2nd segment with 1 spine and 1 seta, 3rd segment with 3 spines, a setiform spine and 2 setae; 1st endopodal segment with 1 plumose seta, 2nd segment bearing 2 distal plumose setae, located between 2 lateral processes and ornamented with 2 rows of spinules on the posterior side

Species Pseudocyclops constanzoi - Plate 5 of morphological figuresIssued from : C. Baviera, N. Crescenti & G. Zagami in Crustaceana, 2007, 80 (5). [p.574].
Female: Spine and setal formula of swimming legs P1 to P4.
Spine : Roman numerals; setae: Arabic numerals.

Compl. Ref.:
Belmonte, 2018 (p.273, Table I: Italian zones)
NZ: 1

Distribution map of Pseudocyclops constanzoi by geographical zones
W Medit. 38°16'N, 15°38'E (Faro Lake, Sicily)
N: 2
(972) F: 0,591; {F: 0,591}
Rem.: From wash water from specimens of Pinna nobilis.
For Baviera & al. (2007, p.574) , unique within the genus is the setation of the endopod of P5, with 1 seta on the 1st segment and 2 setae on the 2nd segment.
This species is most closely resembles P. umbraticus for the armature formula of the 3rd exopodal segment of P5 (I-0; I-1; III-I-2). P. umbraticus appears very similar to P. costanzoi also in the shape of the female P5, even if in P. umbraticus the female P5 endopod shows vestigial segmentation (Giesbrecht, 1893).
Last update : 06/02/2020
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Razouls C., Desreumaux N., Kouwenberg J. and de Bovée F., 2005-2024. - Biodiversity of Marine Planktonic Copepods (morphology, geographical distribution and biological data). Sorbonne University, CNRS. Available at http://copepodes.obs-banyuls.fr/en [Accessed May 25, 2024]

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