Macvicaria maillardi Bartoli, Bray & Gibson, 1989

Zedam, F. - Z., Boukadoum, A. & Tazerouti, F., 2024, Four Species Of Digeneans (Trematoda, Opecoelidae) Of The Gilthead Seabream Sparus Aurata (Teleostei, Sparidae) Off The Algerian Coast In The Mediterranean Sea, Zoodiversity 58 (6), pp. 527-544 : 535

Macvicaria maillardi Bartoli, Bray & Gibson, 1989

Host. Sparus aurata Linnaeus, 1758

L o c a l i t y. Algerian coast in Oran.

S i t e o n h o s t. Intestine.

R e c o r d s i n t h e M e d i t e r r a n e a n. Ex S. aurata , off Var, Provence, France, Hyères ( Stossich, 1885; Stossich, 1898; Papoutsoglou, 1976; Bartoli et al., 1989) off Trieste ( Stossich, 1885; Stossich, 1898) off France (Bartoli et al., 1989) off Saronic Gulf ( Papoutsoglou, 1976) off Tunisia ( Derbel et al., 2012; Gargouri, 2011; Antar & Gargouri, 2018) and ex Lithognathus mormyrus (Linnaeus, 1758) off Tunisia ( Gargouri, 2011) and off Algeria ( Bellal et al., 2018) ( fig. 4 ).

D e s c r i p t i o n

[Based on 20 whole-mounted gravid specimens; fig. 6 ; measurements in table 4]

Body elongate oval, rounded at both ends; lateral margins parallel. Forebody and hindbody long, occupying 27–30 (31,4) % and 54–55 (55,9) % of body length, respectively ( fig. 6 , A). Tegument thick, unarmed. Oral sucker transversely oval, subterminal, opens anteroventrally. Ventral sucker transversely oval, pre-equatorial, with a transverse slit-like opening, with the major axis transverse; surrounded by several indistinct tegumental folds; numerous muscle fibres radiate from the lateral edges of the sucker to the edges of the body. Ventral sucker is bigger than oral sucker. Prepharynx present, short. Pharynx welldeveloped, large. Esophagus when observed short. Intestinal bifurcation in the mid of the forebody, pre-acetabular. Caeca with thin wall and wide lumen, terminates in the hindbody near the posterior end. Two testes round to transversely oval, entire, tandem, separated, in the anterior half of hindbody, post ovarian. Cirrus-sac present, claviform; dorsal to ventral sucker. In its distal part, internal seminal vesicle tubular and convoluted; in its proximal part, short pars prostatica and muscular ejaculatory duct that opens directly throught a genital pore. Genital pore anterior to the ventral sucker and posterior to the intestinal birufication. Ventral to the left caecum ( fig. 3 , B). Ovary ovoid, entire, dextro-median, post-acetabular, pre-testicular. Oviduct short. Seminal receptacle posterior to ovary. Oötype surrounded by Mehlis’ gland. Uterus coiled between the anterior testis and the ventral sucker, metraterm absent ( fig. 6 , C). Vitellarium follicular post-caeca bifurcation, in lateral fields, and confluent in the post-testicular region. Eggs large, operculated without filaments.

Figures

Fig. 4. Geographical distribution of three species of Macvicaria: M. obovata (Molin, 1859) Bartoli, Bray and Gibson, 1989; M. maillardi Bartoli, Bray and Gibson, 1989 and M. maamouriae Antar, Georgieva, Gargouri et Kostadinova, 2015 from fish around the world. References for the records are given between parentheses.

Fig. 6. Macvicaria maillardi Bartoli, Bray and Gibson, 1989 ex Sparus aurata: A — body, ventral views; B — ventral view of the male genitalia; C — ventral view of the female genitalia.

Fig. 3. Allopodocotyle pedicellata (Stossich, 1887) ex Sparus aurata: A — body, ventral views; B — ventral view of the male genitalia; C — dorsal view of the female genitalia.