Biapertura martensi Sinev 2020, comb. nov.
Creators: name: Sinev, Artem Y.
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Branchiopoda
Diplostraca
Chydoridae
Biapertura
Biapertura martensi

description: Biapertura martensi (Sinev, 2009) comb. nov.
Sinev 2009: 42–48, Fig. 1–4 (Alona).
Type locality. Republic of South Africa, KwaZulu-Natal province, Giant Castle, The Lakes (29°14’31”S 29°33’2”Е), altitude: 1950 m.a.s.l. 26.03.1995.
Type material. Holotype (parthenogenetic female) and paratypes (8 parthenogenetic females, 6 juvenile females of instar II, 2 juvenile females of instar I) at Zoological Museum of M. V. Lomonosov, Moscow State University; access numbers Ml–51 and Ml-52, respectively.
Material studied earlier. See Sinev (2009) for the list of material from Republic of South Africa and Lesotho, and for detailed description.
Diagnosis. Parthenogenetic female. Length of adult 0.84–1.17 mm. Body irregular oval (Fig. 15A), with maximum height at the middle of the body, height/length ratio 0.6––0.65 in adults. Postero-dorsal angle with 4–5 groups of setulae, with 4–6 setulae in each (Fig. 15B). Main head pores with PP about 2.5–3 IP in adults (Fig. 15C). Lateral head pores located about 1.5 IP distance from midline, at the level of anterior major head pore. Postabdomen (Fig. 15D) of moderate length and width, narrowing distally in postanal portion; length about 2.5 height; dorsal margin almost straight in postanal portion and weakly concave in anal one, with distal part about 2.5 times longer than preanal one, and with postanal portion 2.6–2.8 times longer than anal one; postanal margin with 15–17 well–developed moderately massive denticles, each with 1–6 denticles along anterior margin. Postabdominal claw with basal spine about 0.3–0.45 of the claw length. Antenna (Fig. 15E) with basal segment of endopodite longer than two others; middle and distal segments of similar length; exopodite with basal and distal segments of similar length; middle segment being slightly shorter than two others. Spine on basal segment of exopodite much shorter than middle segment. Spine on apical segment of exopodite as long as apical segment; spine on apical segment of endopodite shorter than apical segment. Limb I with IDL seta 1 claw-like (Fig. 15F). Seta e of endite 2 being 1.5–1.7 times longer than seta f.
Male unknown.
Differential diagnosis: B. martensi differs from all species of the genus in shorter spine on basal segment of antennal exopodite. It has postabdomen evenly narrowing distally, this feature is shared only by B. elliptica.
Distribution and ecology. South Africa, the East Escarpment region of the Drakensberg mountains. All localities in a single quadrant between 28° and 29° S, 28° and 29° E, at altitudes between 1950 and 2400 m.a.s.l.. The species inhabits small, possibly temporary water bodies, mountain lakes, pools and tarns. The species was sampled at water temperature from 17º to 24º C, and pH from 5.8 to 8.2.
description: Published as part of Sinev, Artem Y., 2020, Re-evaluation of the genus Biapertura Smirnov, 1971 (Cladocera: Anomopoda Chydoridae), pp. 301-335 in Zootaxa 4885 (3) on page 323, DOI: 10.11646/zootaxa.4885.3.1, http://zenodo.org/record/4296625