Anthalona neotropica Sousa, Elmoor-Loureiro and Debastiani-Júnior, 2015

Jesus, Sheila Bonfim de & Elmoor-Loureiro, Lourdes M. A., 2021, Occurrence of Anthalona neotropica Sousa, Elmoor-Loureiro and Debastiani-Júnior, 2015 (Crustacea: Cladocera: Chydoridae) in Bahia State, Brazil, Nauplius (e 2021010) 29, pp. 1-5 : 3-4

Anthalona neotropica Sousa, Elmoor-Loureiro and Debastiani-Júnior, 2015

( Fig. 2 )

Material examined. 1♀ (EL02515), Brazil, Bahia State, municipality of Belmonte, Jequitinhonha River , 15°51’47”S 38°54’13”W, October 2012, coll. S.B. Jesus ; 1♀ (EL02559), Brazil, Bahia State, municipality of Una, Una River , 15°17’57”S 39°00’28”W, October 2012, coll. S.B. Jesus.

Remarks. The observed specimens ( Fig. 2 ) match the main diagnostic characters of An. neotropica .Like all Anthalona members, they possess two main connected head pores and lateral head pores with cosmaria-like sacs below them ( Fig 2I ); post-abdomen S-shaped with deep concave anal margin, unmerged marginal denticles, lateral fascicles with long distal setulae ( Fig. 2C–E ); IDL with two setae. The specimens were identified as An. neotropica based on: labrum keel convex and without denticles ( Fig. 2F ); IDL setae of similar size and presenting fine setulae ( Fig. 2H ); spine on the first segment of endopod of antenna II very long and almost reaching the end of the third segment ( Fig. 2G ); pecten of post-abdominal claw organized in two groups; long spinulae on the base of terminal claw.

It should be mentioned that the sites where An. neotropica was found were characterized by the absence of floating macrophytes and by low salinity (<0.5 ‰), typical of freshwaters. In the samples in which An. neotropica was present, no other Anthalona species was found. In fact, in the sample from Una estuary, An. neotropica was the single species observed. The sample from Jequitinhonha estuary was dominated by typically planktonic species — such as Bosmina freyi De Melo and Hebert, 1994 , Ceriodaphnia cornuta Sars, 1885 , and Daphnia gessneri Herbst, 1967 — with a few specimens of Ilyocryptus spinifer Herrick, 1882 and An. neotropica .

Figures

Figure 2. Anthalona neotropica Sousa, Elmoor-Loureiro and Debastiani-Júnior, 2015. A, Habitus, specimen from Jequitinhonha River.B, Habitus, specimen from Una River. C–E, Post-abdomen (arrow indicating the lateral fascicles).F, Labral keel and antenna. G, Spine on the first segment of endopod of antenna. H, First trunk limb, arrows showing the IDL setae. I, Head pores. mp: main pores, lp: lateral pore. Scale bars = 100 µm (A, B) or 10 µm (C–I).