Monobiceros langi Faubel, 1984

Cuadrado, Daniel, Rodríguez, Jorge, Moro, Leopoldo, Grande, Cristina & Noreña, Carolina, 2021, Polycladida (Platyhelminthes, Rhabditophora) from Cape Verde and related regions of Macaronesia, European Journal of Taxonomy 736, pp. 1-43 : 29

Monobiceros langi Faubel, 1984

Figs 1 C–D, 7E

Pseudoceros maximus Lang, 1884 (in part): 270–271, 543, pl. 30, fig. 17.

Monobiceros langi Faubel, 1984: 215 .

Material examined

CAPE VERDE • 1 spec.; São Vicente Island , Baía das Gatas ; 16°54′09.33″ N, 24°54′25.24″ W ( Fig. 1C V 2 ); May 2017; Leopoldo More leg.; RCCN .

MOROCCO • 3 specs; Sidi Ifni ; 29°22′58.00″ N, 10°10′37.88″O ( Fig. 1D M 2 ); 2 Sep. 2016; Leopoldo Moro leg.; RCCN .

Distribution

Gulf of Naples, Italy ( Lang 1884); Cádiz, Spain ( Bahia et al. 2017); Crete, Greece ( Bahia et al. 2017).

New records

Baía das Gatas, São Vicente Island, Cape Verde. Sidi Ifni, Morocco. These are the first records outside the Mediterranean Sea.

Description

Body oval and elongated sometimes pear-shaped, with wavy margins and thickened dorsal midline. Length 2.3 cm. The background color varies with transmitted or reflected light. With reflected light, the dorsal surface is chocolate brown, speckled with white patches. Under transmitted light, the pigmentation looks milky brown with dark margins and a dark dorsal midline that delimited the characteristic bulge ( Fig. 7E ). Dorsal surface smooth. Tentacles formed by simple folds and cone-like in shape. Cerebral eyes form a single large rounded cluster behind the tentacles; frontal eyes scattered between the tentacles. Compact ruffled pharynx located directly behind the cerebral eyes.

Figures

Fig. 1. Location of sampling points, distribution of the Macaronesian archipelagos and limitation of regions: Lauri-Macaronesia or Lusitanian Macaronesia (white); Central Macaronesia or Eumacaronesia (bordeaux) and Great Macaronesia (green). Abbreviations:A1 = San Miguel Island, Azores; C1 = Pasito Blanco, Gran Canaria, Canary Islands; C2 = Tenerife, Canary Islands; C3 = Garachico, Tenerife, Canary Islands; C4 = Amarilla Golf, Tenerife, Canary Islands; CV1 = Astillero Mindelo, S„o Vicente Island, Cape Verde; CV2 = Bahía das Gatas, S„o Vicente Island, Cape Verde; CV3 = Calheta Funda, Sal Island, Cape Verde; M1 = Ifni, South Morocco; M2 = Agadir, South Morocco.

Fig. 2. Marcusia alba sp. nov. (MNCN 4.01/2620 to 2683).A. Whole live animal, dorsal view.B. Anterior region with cerebral eyes cluster and pseudotentacles (white arrows). C. Histological section of the male copulatory organ stained with AZAN. D. Histological section of the female copulatory organ stained with AZAN. E. Sagittal reconstruction of the reproduction system. Abbreviations: see Material and methods.

Fig. 7. A. Anonymus ruber Cuadrado, Moro & Noreña, 2017 from Cape Verde. B. Cycloporus gabriellae Marcus, 1950 from Cape Verde. C. Prostheceraeus moseley Lang, 1884 from Cape Verde. D. Pseudoceros velutinus (Blanchard, 1847) (transmitted light) from Cape Verde. E. Monobiceros langi Faubel, 1984 from Cape Verde. F. Stylochus pilidium (Götte, 1881) from South Morocco. G. Stylochus pillidium (Götte, 1881) from Azores. H. Stylochus sp. from South Morocco. I. Stylochus neapolitanus (Delle Chiaje, 1841–1844) from Madeira. J. Planocera pellucida (Mertens, 1833) from Canary Islands. K. Discocelis tigrina (Blanchard, 1847) from Canary Islands. L. Gnesioceros sargassicola (Mertens, 1833) from Canary Islands.