A Review of the Genus Thermocyclops - Zoological Studies

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Chaicharoen et al. – Review of Thermocyclops in Cambodia 797(A)(B)(C)(D)(E)Fig. 15. Thermocyclops decipiens, female (Cambodia). (A) Pediger 5 and genital double-somite, ventral view; (B, C) antennule: (B)segments 12-15, posterior view; (C) segments 16 and 17, anterior view; (D, E) antennal coxobasis: (D) anterior view; (E) posterior view.(A, D, E) Locality CB34, (B, C) locality CB49. Scale bars = 50 µm.(A)(B)(C)(D) (E) (F)Fig. 16. Thermocyclops decipiens, female (Cambodia). (A) P1, posterior view; (B) P2 protopodite, posterior view; (C) P3 protopodite,posterior view; (D, E) P4, posterior view: (D) protopodite, exp1-2, and enp1-2; (E) exp3 and enp3; (F) P4 coupler, anterior view. (A)Locality CB1, (B-F) locality CB34. Scale bar = 50 µm.
798 Zoological Studies 50(6): 780-803 (2011)conspicuously high. P5 typical for genus. Formorphometric data see table 3.Remarks: The Cambodian T. decipiens differsfrom the type (Kinshasa, Congo; Mirabdullayev etal. 2003) in a single character. On the posteriorsurface of the antennal coxobasis, a group ofspinules below the medial setae is present in boththe Australian (Hołyńska 2006) and Cambodianfemales (Fig. 15E), yet absent from the typematerial (Mirabdullayev et al. 2003). Thesespinules are extremely tiny in specimens from thePhilippines and Indonesia for instance; thereforeit is possible that the size reduction of spinulesmight result in the full disappearance of thisgroup in other populations (Hołyńska 2006). Theaesthetasc on antennulary segment 16 is setalikein Cambodia, while it abruptly narrows in 1Australian specimen (Hołyńska 2006). Anotherdifference is in the ornamentation of the anteriorsurface of the P2 and P3 couplers, which are barein Cambodian populations and pilose (with a fewhairs) in the Australian female.This pantropical species is known fromCentral and South America, Africa, India, SriLanka, Indonesia, and Australia (Mirabdullayevet al. 2003); in Southeast Asia it was reportedfrom Thailand (Alekseev and Sanoamuang2006), Vietnam (Mirabdullayev et al. 2003),and Cambodia (our record). It even occurs ingroundwater in West Indian islands (Pesce 1985),where it has somewhat different ornamentation ofthe P4 coupler and more-elongated caudal rami.Thermocyclops crassus (Fischer, 1853)(Figs. 17, 18)Cyclops crassus Fischer 1853: 92-93, pl. III, fig. 29;Mesocyclops crassus Sars 1914 (1913-1918): 61-62, pl.37; Mesocyclops (Thermocyclops) crassus Rylov 1948:305-306, fig. 77; Thermocyclops crassus Dussart 1969:210-213, fig. 108; Mirabdullayev et al. 2003: 265-267, fig.125; Hołyńska 2006: 344-345, figs. 19, 20.Material examined: Cambodia: BanteayMeanchey Prov., Srisophol Dist., Sei Sen, pond,13°33'N, 102°59'E, 12 Feb. 2007, 1 , slideCB1(1A,B); Prek Toam, Kratie Prov., Kratie Dist.,Bossliv, Khong River, 12°21'N, 106°03'E, 13Feb. 2007, 1 , slide CB15(1A,B); Stung Treng(A)(B)(C)(D)Fig. 17. Thermocyclops crassus, female (Cambodia). (A) Genital double-somite, ventral view; (B) antennule, segments 12-17,posterior view; (C, D) antennal coxobasis: (C) anterior view; (D) posterior view. (A) Locality CB72, (B-D) locality CB88. Scale bar =50 µm.
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A Review of the Genus Thermocyclops - Zoological Studies

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