Se propone un nuevo genero Afractinca en la familia Actinolaimidae para situar cuatro especies de Costa de Marfil, una nueva A. andrassyi y tres previamente atribuidas al genero Brasilaimus: A. heynsi (Coomans et Vinciguerra, 1989) comb. n., A. irmae (De Ley et Coyne, 1997) comb. n. y A. papillata (Schneider, 1935) comb. n. El nuevo genero se distingue por su extremo anterior bordeado externamente por un ensanchamiento hexagonal que esta unido, mediante puntas o denticulos radiales, a una proyeccion cuticular en forma de disco que rodea la boca y sobresale anteriormente. Sobre el ensanchamiento hexagonal se situan las seis papilas labiales internas y las cuatro cefalicas, disposicion esta de las estructuras de la region labial que distingue Afaclinca gen. n. de Brasilaimus Lordello et Zamith, 1957 va que en este en lugar del ensanchamiento hexagonal externo hay un anillo esclerotizado mas delgado situado mas en el interior de la region labial y las papilas no se localizan sobre el anillo sino en la superficie externa de esta. Ademas, en el nuevo genero los machos carecen siempre de abultamiento copulador ("Kopulationshocker"). La nueva especie Afractinca andrassyi sp. n. se caracteriza por tener 20-22 crestas cuticulares longitudinales, region labial grande y algo diferenciada del resto del cuerpo, y cola mas larga que seis diametros anales. El status taxonomico de los generos Actinca y Brasilaimus es asimismo discutido.
The new genus Afractinca is erected in Actinolaimidae to accommodate four species from Ivory Coast. A. andrassyi sp. n. and three species previously attributed to Brasilaimus, viz. A. heynsi (Coomans & Vinciguerra, 1989) n. comb., A. irmae (De Ley & Coyne, 1997) n. comb, and A. papillata (Schneider, 1935) n. comb. The new genus is characterised by having the anterior end externally bordered by a hexagonal thickening, connected by radial prongs or denticles to a convex, disk-like cuticular projection anteriorly protruding and surrounding mouth. On the hexagonal thickening six inner labial and four cephalic papillae are located; this arrangement of the lip region structures distinguishes Afractinca gen. n. from Brasilaimus Lordello & Zamith, 1957, where instead of the external hexagonal thickening there is a thinner sclerotized ring internal to the lip region and the six inner labial and the four cephalic papillae are not located on the ring but on the external walls of lip region. In the new genus males always lack copulatory hump ("Kopulationshocker"). A fractinca andrassyi sp. n. is characterized by having 20-22 longitudinal ridges in the cuticle, lip region large and slightly set off from body, and tail longer than six anal body widths. The taxonomic status of Actinca and Brasilaimus is discussed.
Vinciguerra M.T., Clausi M. - 1999 Afractinca andrassyi gen. n. sp. n. (Nematoda: Actinolaimidae) from Ivory Coast
CLAUSI, MIRELLA
2000-01-01
Abstract
The new genus Afractinca is erected in Actinolaimidae to accommodate four species from Ivory Coast. A. andrassyi sp. n. and three species previously attributed to Brasilaimus, viz. A. heynsi (Coomans & Vinciguerra, 1989) n. comb., A. irmae (De Ley & Coyne, 1997) n. comb, and A. papillata (Schneider, 1935) n. comb. The new genus is characterised by having the anterior end externally bordered by a hexagonal thickening, connected by radial prongs or denticles to a convex, disk-like cuticular projection anteriorly protruding and surrounding mouth. On the hexagonal thickening six inner labial and four cephalic papillae are located; this arrangement of the lip region structures distinguishes Afractinca gen. n. from Brasilaimus Lordello & Zamith, 1957, where instead of the external hexagonal thickening there is a thinner sclerotized ring internal to the lip region and the six inner labial and the four cephalic papillae are not located on the ring but on the external walls of lip region. In the new genus males always lack copulatory hump ("Kopulationshocker"). A fractinca andrassyi sp. n. is characterized by having 20-22 longitudinal ridges in the cuticle, lip region large and slightly set off from body, and tail longer than six anal body widths. The taxonomic status of Actinca and Brasilaimus is discussed.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
