Bosmina fatalis Burckhardt, 1924

Pascual, Jhaydee Ann F., Rizo, Eric Zeus C., Han, Boping, Dumont, Henri J. & Papa, Rey Donne S., 2014, Taxonomy and distribution of four Cladoceran families (Branchiopoda: Cladocera: Moinidae, Bosminidae, Chydoridae and Sididae) in Philippine inland waters, Raffles Bulletin of Zoology 62, pp. 771-794 : 773-774

Bosmina fatalis Burckhardt, 1924

Specimen examined. 12 samples from Lake Taal, Lake Buhi, Laguna de Bay, Lake Lumot-Mahipon and Pantabangan Dam were examined and stored in UST-ZRC with reference numbers 0083–0089, 0094A–0095A and 00134–00136.

Description. Body length ranges in 0.4–0.6 mm. Bosmina fatalis has a long rostrum fused with antennules of variable length and shape ( Fig. 3B ). B. fatalis in the study has an oval shaped front head pore situated at the midpoint between the two frontal setae that conforms to the description of ( Fig. 4D ) that conforms to the description of Kořínek et al. (1997). A small and round median head pore (MHP) is also located on the dorsal surface of the head which is connected to the cord-like structure that is suggested to be a supraeosophageal ganglion ( Kořínek et al., 1997). Long mucro situated at the distal end of the carapace. Setules are observed in the postabdomen with a slightly convex ventral margin and an anal opening at the lateral aspect. The postabdominal claw consists of a row of 6–8 teeth with minute spines continuing ventrally ( Fig. 3C ).

Distribution. Cagayan: Lake Bangalau, Benguet: Ambuklao dam; Nueva Ecija: Pantabangan dam; Tarlac: Lake Tambo; National Capital Region (NCR): Pasig River, Marikina River; Laguna: Lake Palakpakin, Lake Kalibato, Lake Yambo, Lake Tadlak, Lake Caliraya, Lake Lumot-Mahipon; Batangas: Lake Taal; Camarines Sur: Lake Buhi, Lake Bato; Sorsogon: Lake Bulusan; Oriental Mindoro: Lake Naujan; Negros Oriental: Lake Danao, Lake Kabalin-an; Lanao del Norte: Agus IV Dam; Agusan Del Norte: Lake Mainit; South Cotabato: Lake Lahit, Lake Siloton, Lake Sebu; Lanao del Sur: Lake Lanao ( Fig. 2 ).

Remarks. B. fatalis collected in the Philippines were compared to the same species sampled in Taihu Lake, China (type locality). The species is reported in East Asian lakes and reservoirs. B. fatalis can also be found from the temperate zone in the north to the subtropical and tropical areas ( Japan, Philippines, China and Indonesia) ( Fernando, 2002).

Figures

Fig. 3. Bosmina fatalis parthenogenic female. A, habitus; B, antennule; C, terminal claws; D, postabdomen.

Fig. 4. Scanning electron micrographs of Bosmina fatalis. A, habitus; B, frontal head pore (FHP); C, antennule showing the dimensions of the rostrum; D, lateral head pore (LHP); E, postabdomen showing claw; F, inverted postabdominal claw showing pecten and setules.

Fig.2. Distribution of family Bosminidae based on recently collected samples (2013) and stored samples in the UST ZRC.