Cymbasoma gracile - Species Card - Marine Planktonic Copepods

Cymbasoma gracile Gurney, 1927 (F,M)

Taxonomy

Order Monstrilloida

details

Family Monstrillidae

details

Genus Cymbasoma

details list species for this Genus

Abbreviations or symbols

Synonymy

Monstrillopsis gracilis : Isaac, 1975 (n° 144/145, p.3, 6, 9, fig.F); Grygier, 1995 a (p.65); ? Holmes, 2001 (p.62);
no Monstrillopsis dubia : Vilela, 1968 (p.45, figs.F);
Cymbasoma gracilis :Sterza & Fernades, 2006 (p.95, Table 1, occurrence); Oliveira Dias & Costa Bonecker, 2007 (p.284: Rem); Oliveira Dias & al., 2008 (p.248, tab.1)

References

List of the studied authors

Gurney, 1927 (p.169, figs.F,M); Al-Kholy, 1963 (p.134, fig.F); Dias & Araujo, 2006 (p.92, figs.F, Rem., chart, as C. gracilis); Suarez-Morales & al., 2006 (p.104, Rem.); Vives & Shmeleva, 2010 (p.160, figs.F,M, Rem.); Suarez-Morales & al., 2006 (p.104: Rem.).

Figures

Plate 1 issued from : A.A. Al-Kholy in Publs mar. biol. Stn Ghardaqa, 1963, 12. [p.132, Figs.26-31].
Female (from Al-Ghardaqa, Red Sea): 26, habitus (ventral); 27, A1; 28, P4; 29, right P5; 30, left P5; 31, urosome.

Nota: A1 4-segmented with 2 spines + 2 long setae at apex; abdomen 2-segmented; genital spine half the total length of body.

Species Cymbasoma gracile - Plate 2 of morphological figures

Plate 2 issued from : C. de O. Dias & A.V. Araujo in Atlas Zoopl. reg. central da Zona Econ. exclus. brasileira, S.L. Costa Bonecker (Edit), 2006, Série Livros 21. [p.92].
Female (from Brazil).

Species Cymbasoma gracile - Plate 3 of morphological figures

Plate 3 Issued from : E. Suarez-Morales, A. Bello-Smith & S. Palma in Zool. Anz., 2006, 245. [p.103, Table 1]. As Cymbasoma gracilis. Structural characteristics.
Morphological characters for comparative morphology of the species assigned to the genus Monstrillopsis by different authorities. See : M. chilensis, M. dubioides, M. fosshageni, reticulata, sarsi, dubia, M. ferrari, M. zernovi, M; angustipes, Monstrillopsis sp.

Species Cymbasoma gracile - Plate 4 of morphological figures

Plate 4 Issued from : R. Gurney in Trans. zool. Soc. London, 1927, 22. [p.169, Fig.28].
Female (Suez Canal): A, habitus (lateral); B, abdomen and P5 (ventral); C, A1.

Male: D, abdomen (ventral); E, A1.

Nota female:
- Body very slender.
- Relative length of A1, cephalotorax (head and 1st thoracic somite), and abdomen 35 : 12 : 17.
- Proportion of cephalothorax and behind oral tubercle 19 : 103.
- Abdomen 2-segmented, 2nd incompletely divided into two.
- Furcal rami divergent, each with 3 setae.
- Ovigerous spines separate, about half the total length of body.
- A21 4-segmented, but the 3rd not distinctly jointed off; relative lengths of segments 12 : 219 : 13 : 50.
- P5 deeply bifurcated, the outer branch bearing 3 long setae and extending as a lobe rather beyond the insertion of the setae.

Nota male:
- Less slender than female.
- Abdomen 4-segmented, 3rd and 4th not completely separated.
- Furcal rami with 3 setae only.
- A1 larger than in female and composed of 5 segments, relative lengths 13 : 18 : 10 : 25 : 21.
- Copulatory appendage with 2 narrow divergent lobes.
- P5 absent.

Complementary References

List of the studied authors

Sewell, 1949 (p.142, Rem.); Grygier, 1994 a (p.28); 1995 a (p.65); Dias & Bonecker, 2007 (p.270, 272, fig.3, tab.II)

Distribution

NZ: 2 + 1 doubtful

Distribution map of Cymbasoma gracile by geographical zones

Additional Maps & Charts

Species Cymbasoma gracile - Distribution map 2

Map 2 issued from : C. de O. Dias & A.V. Araujo in Atlas Zoopl. reg. central da Zona Econ. exclus. brasileira, S.L. Costa Bonecker (Edit), 2006, Série Livros 21. [p.31].
Chart of occurrence in Brazilian waters (sampling between 16°-18° S).
Nota: sampling 2 specimens.

Localisations

Geographical glossary

[? W Ireland, ? Channel of Bristol], Suez Canal (Suez, Amer Lakes), Red Sea, Brazil (Vitoria Bay, Natal-Pontal do Sul, Bahia State)

Quotations

N: 5

Dimensions (mm)

References of the authors concerning dimensions

(178) F: 1,84-1,8; M: 1,13; (728) F: 2; (995) F: 1,28-1,86*; (997) F: 0,9-1,97*; {F: 0,90-2,00; M: 1,13}
*: caudal rami excluded.

Remarks

For Suarez-Morales & al. (2006, p.104) underline that Isaac (1975) proposed to move this species of Gurney (1927) to Cymbasoma to Monstrillopsis, apparently based on the position of the mouth (no more than 0.25 of the way back along the ventral cephalothorax) and the development of the eyes. However, the presence of only 3 caudal setae in both sexes, combined with the structure of P5 female, the presence of only 1 free postgenital somite in the female and 2 in the male, makes it easy to reinstate this species in Cymbasoma.

Last update : 19/04/2020

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