Mesocyclops and Thermocyclops (Copepoda, Cyclopidae) in the major Visayas Islands (central Philippines)

in Crustaceana
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Our knowledge of the freshwater cyclopid copepods of the Visayas Islands remains poor as compared to other terrestrial and aquatic fauna. This study focuses on two genera, Mesocyclops and Thermocyclops, which are common components of lake plankton communities. This study included specimens collected from 59 sampling sites found in major islands (Panay, Negros, Cebu, Bohol, Leyte and Samar) and a small island (Pacijan) in the Visayas region. Four species of Mesocyclops and three species of Thermocyclops were identified. This includes the first record of Mesocyclops woutersi in the Philippines, which was so far unknown from insular SE Asia. The endemic Mesocyclops microlasius, previously reported from Luzon Island, was also found in Lake Danao (Pacijan Island). An identification key to Philippine species of Mesocyclops and Thermocyclops is herein provided. Geographic distribution and possible causes of the low number of species observed and their implications for further faunal studies are also discussed.

Mesocyclops and Thermocyclops (Copepoda, Cyclopidae) in the major Visayas Islands (central Philippines)

in Crustaceana

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References

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Figures

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    Map of the Philippines highlighting the major islands in the Visayas. PA, Panay; N, Negros; C, Cebu; B, Bohol; L, Leyte; S, Samar; PC, Pacijan.

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    Sampling sites in the major Visayas islands.

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    Mesocyclops aspericornis (Daday, 1906). Female. A, Urosome, dorsal; B, seminal receptacle; C, caudal rami, ventral; D, antennal coxobasis, caudal; E, P4 endopite 2-3, frontal. Specimens drawn were collected at Brgy. Danglag, Consolacion, Cebu. with Ref. Nos. USTZRC 0070A-D. Scale bars: A = 250 μm; B-E = 50 μm.

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    Mesocyclops microlasius Kiefer, 1981. Female. A, Urosome, ventral; B, seminal receptacle; C, caudal rami, ventral. Specimen drawn was collected at Lake Danao, Pacijan Island with Ref. Nos. USTZRC 0164A-B. Scale bars: A = 250 μm; B-C = 50 μm.

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    Mesocyclops thermocyclopoides Harada, 1931. Female. A, Urosome, dorsal; B, seminal receptacle; C, antennule, segments 12-16 (setae not shown on segment 16). Specimens drawn were collected at Brgy. Sublangon, Pontevedra, Capiz with Ref. Nos. USTZRC 0163A-D. Scale bars: A = 250 μm; B-C = 50 μm.

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    Mesocyclops woutersi Van de Velde, 1987. Female: A, Urosome, ventral; B, antennary coxobasis, caudal; C, P4 intercoxal sclerite, protopodite, exp1 and enp1, frontal; D, P4 endopodite 2-3, frontal. Specimen drawn was collected at Lake Lamak, Cebu with Ref. Nos. USTZRC 0165A-B. Scale bars: A = 250 μm; B-F = 50 μm.

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    Thermocyclops crassus (Fischer, 1853). Female. A, Urosome, dorsal; B, seminal receptacle; C, P4 protopodite, intercoxal sclerite and exp1 and enp1, frontal; D, P4 endopodite 2-3. Specimen drawn was collected at Lake Balinsasayaw, Negros Oriental with Ref. Nos. USTZRC 0167A-B. Scale bars: A = 250 μm; B-D = 50 μm.

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    Thermocyclops decipiens (Kiefer, 1929). Female. A, Urosome, dorsal; B, seminal receptacle; C, P4 intercoxal sclerite, protopodite, exp1 and enp1, caudal. The specimen drawn was collected at Malinao Dam with Ref. Nos. USTZRC 01680A-B. Scale bars: A = 250 μm; B-C = 50 μm.

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    Thermocyclops taihokuensis (Harada, 1931). Female. A, Urosome, dorsal; B, seminal receptacle; C, P4 intercoxal sclerite, protopodite, exp1 and enp1, caudal; D, P4 endopodite 2-3. Specimen drawn was collected at Lake Bito, Leyte with voucher specimen Ref. Nos. USTZRC 0169A-B. Scale bars: A = 250 μm; B-D = 50 μm.

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    Geographical distribution of Mesocyclops and Thermocyclops in the major islands of Visayas. MA, M. aspericornis; MM, M. microlasius; MT, M. thermocyclopoides; MW, M. woutersi; MS, Mesocyclops sp.; TC, T. crassus; TD, T. decipiens; TT, T. taihokuensis; TS, Thermocyclops sp.

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