Anthalona brandorffi ( Sinev & Hollwedel, 2002 ) DAMME, KAY VAN, SINEV, ARTEM YU & DUMONT, HENRI J., 2011

DAMME, KAY VAN, SINEV, ARTEM YU & DUMONT, HENRI J., 2011, Separation of Anthalona gen. n. from Alona Baird, 1843 (Branchiopoda: Cladocera: Anomopoda): morphology and evolution of scraping stenothermic alonines, Zootaxa 2875 (1), pp. 1-64 : 16-17

Anthalona brandorffi ( Sinev & Hollwedel, 2002) comb.nov.

Alona brandorffi Sinev & Hollwedel, 2002 . Description in Sinev & Hollwedel (2002).

Material examined. Three adult parthenogenetic female and exuvium from Belize, Crooked Tree Sanctuary lagoon, coll. by A. Scharf, 07.XII.2005, kept at the Zoological Museum of Moscow State University. One adult parthenogenetic female from temporary pool Lençóis Maranhenses, Brazil, Leg. K. Van Damme, locality S 4 in Van Damme & Dumont (2010), S 2° 35’ 50” W 42° 42’ 46”, 16.VIII.1996, in slide with A. acuta n. sp. ( RBIN IG 31782 ) .

Notes on specimens from Belize and additions to original description. Specimens agree with the initial description in general features, including shape and size ( Fig. 7A ), morphology of head pores ( Fig. 7B ) and of all appendages. The shape of postabdomen in specimens from Belize ( Fig. 7E ) is different from that of the Brazilian specimens from Roraíma (see Sinev & Hollwedel, 2002, Figs 7 , 23–24 ) or the Lençóis ( Fig. 7F ), wider in the anal part and almost with a straight anal margin. Armament of the postabdomen and morphology of the claw are similar and study of the limbs revealed no differences from the type population. Several features on the limb morphology of A. brandorffi could be noted in addition to the original description. Both IDL setae ( Fig. 7C ) are armed with large spine-like denticles. The denticles are similar in the distal portion of these setae. A strong heterogeneous setulation, characteristic for most Anthalona species , is absent. A minute exopodite seta, not mentioned in the initial description, was revealed on limb II ( Fig. 7D ). Almost indistinctive spinules were found on scraper seven of the same limb, but not on the eighth scraper ( Fig. 7D ); filter plate II consists of seven setae ( Fig. 7D ), not of six, as reported in the initial description, hereby corrected.

Differential diagnosis. A. brandorffi cannot be confused with other species of the genus. It has long marginal setae in the posterior portion of the valves ( Fig. 7A ) and the shape of the postabdomen is peculiar, with long lateral spines ( Figs 7E–F ). The labral keel bears no denticles and limbs are modified, for example in the peculiar second limb ( Fig. 7D ). May coexist with other Anthalona species , as in the Lençóis, where it is found with A. verrucosa verrucosa and A. acuta n. sp.

Distribution and ecology. Formerly only from Roraíma ( Sinev & Hollwedel 2002), now Brazil and Belize. We found a single specimen in the Lençóis Maranhenses during this study, the second record for Brazil. This peculiar species may have a wider distribution in the Neotropics, but remains rarely seen. Little is known about its ecology; in temporary waters in the Brazilian Lençóis, it coexists with A. acuta n. sp. (see above) and A. verrucosa verrucosa . See Van Damme & Dumont (2010) for ecological details on this locality.

Figures

FIGURE 7. Anthalona brandorffi (Sinev & Hollwedel, 2002) comb.nov. Parthenogenetic females from Crooked Tree Sanctuary lagoon, Belize (A–E) and from temporary dune pools at the Lençóis Maranhenses, Brazil (F–G). A. Habitus, lateral view. B. Head shield. C. First limb, inner (IDL) and outer distal lobe (ODL). D. Second limb with reduced scrapers, typical for A. brandorffi. E. Postabdomen, Belize specimen. F. Postabdomen, Lençóis specimen. G. Idem, basal spine on terminal claw.

FIGURE 23. Anthalona verrucosa verrucosa (Sars, 1901) = Alona verrucosa Sars, 1901, males (A–C) from the Lençóis Maranhenses, Brazil, Leg. K. Van Damme (from culture) and type series of “true (?)” Anthalona verrucosa verrucosa (Sars, 1901) = Alona verrucosa Sars, 1901, paralectotypes (D–L) from G.O. Sars Collection, F12337, Zool. Mus. Oslo (selected by Valdivia- Villar). A. Habitus male. B. Postabdomen male. C. Detail on first limb, with copulatory hook or clasper. D. Paralectotype, habitus parthenogenetic female. E.–F. Postabdomen. G. Labral keel. H. Second antenna. I. Head pores. J. First limb, ODL seta and IDL setae. K. Scrapers of second limb. L. Second limb, sixth scraper. Abbreviations: ch, copulatory hook, IDL, inner distal lobe, ODL, outer distal lobe.

FIGURE 24. Anthalona verrucosa pectinata (Elías-Gutiérrez & Suárez-Morales, 1999) comb. nov. = Alona pectinata Elías- Gutiérrez & Suárez-Morales, 1999, adult parthenogenetic females from Mahajual, Mexico, Leg. A.A. Kotov. A. Habitus. B. Idem, outline. C. Head pores. D. Second antenna. E. Postabdomen. F. Idem, marginal denticles. G. Idem, basal spine. H. Idem,