Streptocephalus sangoensis n. sp. (Anostraca, Streptocephalidae), a new large branchiopod species for southern Africa

in Crustaceana
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Recent collections from the south-eastern Lowveld of Zimbabwe yielded an undescribed species of the freshwater branchiopod genus Streptocephalus. The species was formerly published as Streptocephalus cf. bidentatus by Brendonck & Riddoch (1997), indicating that more research was needed to prove its valid species status, distinct from S. bidentatus sensu stricto. The new species can be distinguished from S. bidentatus sensu stricto, mainly by its cercopods. The cercopods of S. bidentatus sensu stricto have spines in the distal third region of the furcal rami, while those of S. sangoensis n. sp. are setiferous up to the tips. All other morphological features are the same. The occurrence of the two species in syntopy further validates that they are different species. As with S. bidentatus sensu stricto, the new species S. sangoensis n. sp. was collected from ephemeral habitats. This region is a hotspot of large branchiopod diversity with a total of 16 known species occurring there.

Streptocephalus sangoensis n. sp. (Anostraca, Streptocephalidae), a new large branchiopod species for southern Africa

in Crustaceana



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    Location of the sample sites within Save Conservancy in Zimbabwe. Triangles indicate large endorheic pans, circles small endorheic pans, and diamonds floodplain pans.

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    Holotype male specimen of Streptocephalus cf. bidentatus, i.e., Streptocephalus sangoensis n. sp. Scale bar = 5 mm.

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    A, Finger and thumb of Strepotcephalus cf. bidentatus (Streptocephalus sangoensis n. sp.); B, thumb of male Streptocephalus cf. bidentatus (Streptocephalus sangoensis n. sp.); C, finger of male Streptocephalus cf. bidentatus (Streptocephalus sangoensis n. sp.) Abbreviations: F, finger; TT, tooth between anterior region of thumb and thumb spur; TS, thumb spur; AT, anterior region of thumb; FT, fold in thumb produced to form a tooth; T, thumb; T1, proximal tooth on dorsal surface of finger; T2, distal tooth on dorsal surface of finger). Scale bar = 1 mm.

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    A, Streptocephalus cf. bidentatus (Streptocephalus sangoensis n. sp.) telson with setiferous cercopods up to the tips; B, Streptocephalus bidentatus Hamer & Appleton, 1993 sensu stricto telson with spines on the distal third of the cercopods; C, spines on the distal third of the cercopod of Streptocephalus bidentatus sensu stricto which distinguishes it from Streptocephalus cf. bidentatus (Streptocephalus sangoensis n. sp.). Abbreviations: C, cercopods; CP, caudal processes; FR, furcal ramus; S, spines; T, telson. Scale bar = 1 mm (A, B), 0.25 mm (C).

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