Biapertura ossiani ossiani ( Sinev, 1998 ) ossiani (Sinev, 1998

Sinev, Artem Y., 2020, Re-evaluation of the genus Biapertura Smirnov, 1971 (Cladocera: Anomopoda Chydoridae), Zootaxa 4885 (3), pp. 301-335 : 325

Biapertura ossiani ossiani ( Sinev, 1998) comb. nov.

Sars 1901: 48–49, Pl. 9, figs 1a–d ( Alona affinis ); Sinev 1998: 103–110, Fig. 1–3 ( Alona ).

Diagnosis. adult male postabdomen ( Fig. 16O ) without marginal denticles, all denticles are substituted by groups of setulae.

Differential diagnosis. Biapertura ossiani ossiani differs from Biapertura ossiani herricki comb. nov. in the absence of 1–3 marginal denticles on postanal angle of male postabdomen.

Distribution. B. ossiani ossiani is known from the type locality only, neighborhood of Sao Paolo, Brazil.

Figures

FIGURE 1. Biapertura affinis (Leydig, 1860) from Glubokoe Lake, Moscow Area, Russia.A–K, adult parthenogenetic female. A, lateral view. B–C, posteroventral angle of valves. D, head shield. E, head pores. F, labrum. G, postabdomen. H, postanal margin of postabdomen. I, postabdominal claw. J, antennule. K, antenna. L, ephippial female. M–O, adult male. M, lateral view. N, postabdomen. O, postabdominal claw. (A–L, orig.; M–O, after Sinev et al. 2020)

FIGURE 2. Biapertura affinis (Leydig, 1860) from Glubokoe Lake, Moscow Area, Russia. A–B, lateral view. C, dorsolateral view. D, dorsal view. E, ventral view. F, frontal view. G, ventral part of valve. H, postabdomen. I, postabdominal claw. J, antenna.

FIGURE 3. Biapertura affinis (Leydig, 1860) from Glubokoe Lake, Moscow Area, Russia, parthenogenetic female.A–B, head pores. C–E, posterior dorsal pores.

FIGURE 16. Biapertura ossiani herricki (Sinev, 2013).A–I, adult parthenogenetic female.A, lateral view. B–C, posteroventral angle of valves. D, head pores. E, postabdomen. F, postanal margin of postabdomen. G, postabdominal claw. H, antenna. I, IDL of thoracic limb. J, ephippial female. K–M, adult male. K, lateral view. L, postabdomen. M, copulatory hook and IDL of thoracic limb I. Biapertura ossiani ossiani (Sinev 1998). N–O, adult male. N, lateral view. O, postabdomen. (A–M, after Sinev, 2013; N–O, after Sinev, 1998).