Miscellanea Zoologica Hungarica 11. 1997 (Budapest, 1997)

Hołyńska, M.: A new representative of Mesocyclops thermocyclopoides-circle (Copepoda: Cyclopoida) from India

Transverse ducts of the female genital system not V-shaped (make straight angle with one another) before their connection with the copulatory duct; copulatory duct straight or very slightly curved; caudal surface of the antennary basis with but a reduced pattern of extremely small spinules. Distribution: Lake Toba (Sumatra) 3. Furcal rami medially pilose 4 - Furcal rami medially naked 6 4. Furcal rami medially pilose in the proximal half only M. microlasius Kiefer, 1981 A field of small spinules in addition to the "leuckarti-type" pattern on the caudal surface of antennary basis, next to implantation of the inner setae; transverse ducts of the female genital system V-shaped before their connection with the copulatory duct; the part of the copulatory duct connecting the copulatory pore and transverse duct, well visible. Distribution: Philippines (Luzon) - Medial surface of furcal rami pilose at full length 5 5. Dorsum of genital double somite naked M. aspericornis (Daday, 1906) Caudal surface of antennary basis, in addition to the "leuckarti-type" pattern, with a group of small spinules between the proximal oblique and longitudinal spinule rows, and a field (very often of rectangular shape) of small spinules next to implantation of the inner setae (few spinules near the distal margin of the segment present in specimens from West-Africa); transverse ducts of the female genital system V-shaped before connection with the copulatory duct; distal margin of anal segment ventrally and dorsally fringed with well developed spinules; spinules at implantation of both the antero-and posterolateral furcal setae; no hairs on the caudal surface of the intercoxal sclerite of leg 4 . Distribution: Pantropical. - Dorsum of genital double somite pilose M. dadayi sp. n. On the caudal surface of the antennary basis, in addition to the pattern of "leuckarti-type", a field of small spinules next to implantation of the inner setae always present, spinules next to distal rim of the segment frequently absent; transverse ducts not "V-shaped" before their connection with copulatory duct; copulatory duct with ring-like structures all along; distal margin of anal segment fringed with strong spinules ventrally, and only few small spinules on the dorsal surface; spinules at implantation of only the posterolateral furcal setae; intercoxal sclerite of leg 4 hairy on the caudal surface. Distribution: Known only from its type locality, Calcutta (India). 6. Spinule row on the maxillulary palp present M. ogunnus Onabamiro, 1957 Caudal surface of the antennary basis, besides the "leuckarti-type" spinule pattern, shows a group of large spinules next to implantation of the inner setae; transverse ducts of female genital system often directed to one another at very obtuse angle before their connection with copulatory duct; pediger 5 bears hair rows on the dorsum; distal rim of the anal segment both ventrally and dorsally fringed with large spinules; spinules at implantation of the anterolateral furcal setae often present, but sometimes strongly reduced in size or absent; spinules at implantation of posterolateral furcal setae always present. Distribution: Tropical Asia (northernmost record from Uzbekistan), Africa, Brazil (probably recently introduced). - Spinule row on the maxillulary palp absent 7 7. Group of large spinules on the caudal surface of antennary basis, next to implantation of inner setae, present 8 - Group of large spinules on the caudal surface of antennary basis, next to implantation of inner setae, absent 9 8. Caudal hairs next to medial rim of the leg 4 coxa present M. dussarti Van de Velde, 1984 Dorsum of genital double somite hairy at full length; spinules at implantation of only the posterolateral furcal setae; transverse rows of spinules on the 1., 4-5., and 7-14. antennular segments. Distribution: West-Africa