Species Card of Copepod
Monstrilloida ( Order )
    Monstrillidae ( Family )
        Cymbasoma ( Genus )
Cymbasoma tergestinum  Suarez-Morales, Goruppi, Olazabal & Tirelli, 2017   (F)
Suarez-Morales & al., 2017 (p.1797, Descr.F, figs.F, Rem.)
Species Cymbasoma tergestinum - Plate 1 of morphological figuresIssued from : E. Suarez-Morales, A. Goruppi, A. de Olazabal & V. Tirelli in J. Nat. Hist., 2017, 51 (31-32) [p.1798, Fig.2].
Female (from Trieste): a, habitus (dorsal); b, cephalic region (ventral); c, same (lateral); d, frontal ornamentation and A1 showing armature (dorsal view); e, urosome and P5 (lateral); f, same (ventral); g, P1 with intercoxal sclerite; h, P3 with intercoxal sclerite.
Scale bars: 200 µm (a); 100 µm (d-f); 50 µm (b, c, g, h).

Nota: - Cephalothorax representing 60 % of total body length (caudal rami excluded)
- Oral papilla located at 26 % of cephalothorax length.
- Pair of relatively large ocelli present, pigment cups well developped, medially conjoined, strongly pigmented, ventral cup and lateral cups equally sized.
- Ventral surface of forehead with pair of sensilla.
- Pedigerous somites 2-4, together accounting for 22.5 % of total body length in dorsal view.
- Urosome: 5 pedigerous somite.
- genital double-somite and anal somite, together representing 17 % of total body length.
- Relative lengths of urosomites 28.6 : 47.6 : 23.8 = 100.
- 5th pedigerous somite with medial constriction and ventral peripheral striations; P5 inserted on distal 1/3 of somite.
- Caudal ramus subrectangular, 1.2 times longer than wide, armed with 3 subequally long, sparsely setulated caudal setae.
- Ovigerous spines paired, relatively short, representing 20 % of total body length; basally separated, slender, straight at their base and along shaft, without distal expansions.
- A1 representing about 22 % of total body length and 38 % of cephalothorax length; 4 segmented (but lacking suture between segments 3 and 4). Relative length of distal segment: 46 %. Aesthetasc 4aes not observed in specimen; element 5 spiniform, relatively slender; subterminal elements b1-4 present, unbranched element 6aes present in apical position.
- P5 medially separate, indistinctly bilobate , inner (endopodal) lobe inconspicuous, onarmed, represented by low inner rounded protuberance separated from P5 only at its distal end, lobe barely reachung midlength of outer lobe's inner margin; outer (exopodal) lobe subrectangular, slender, armed with 3 subequally long setae on distal position, innermost slightly shorter than adjacent setae.

Species Cymbasoma tergestinum - Plate 2 of morphological figuresIssued from : E. Suarez-Morales, A. Goruppi, A. de Olazabal & V. Tirelli in J. Nat. Hist., 2017, 51 (31-32) [p.1800].
Female: Armature formula of the swimming legs P1 to P4.

NZ: 1

Distribution map of Cymbasoma tergestinum by geographical zones
Adriatic Sea (G. of Trieste)
N: 1
(1206)* F: 1,13; {F = 1,13}
Total length from the anterior end of cephalosome to the posterior end of the anal somite;

For Suarez-Morales & al. (2017, p.1800) the Trieste specimen is assignable to a group of species related to C. rigidum complex (Suarez-Morales, 2006): the size and shape of the inner lobe in P5 has been used to separate species in this complex (Suarez-Morales, 2006; Suarez-Morales & McKinnon, 2016). In the Trieste's species, the inner lobe is weakly developed. Another variable character of P5 in the group is the relative length of the inner terminal seta of the outer lobe.
For the authors, the new species most closely resembles the Australian C. curticrus on the structure and armature of P5, but diverge in the shape of the genital double-somite, the A1 segmentation and in the body proportions (cephalothorax 58 % vs 70 % in C. curticrus).
Last update : 06/11/2017
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Razouls C., Desreumaux N., Kouwenberg J. and de Bovée F., 2005-2022. - Biodiversity of Marine Planktonic Copepods (morphology, geographical distribution and biological data). Sorbonne University, CNRS. Available at http://copepodes.obs-banyuls.fr/en [Accessed May 21, 2022]

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