megops Sars, 1862

Kotov, Alexey A., Ibragimova, Aisylu G. & Neretina, Anna N., 2018, Identification of Ceriodaphnia Dana, 1853 (Crustacea: Cladocera) taxa from European Russia based on ephippial morphology, Zootaxa 4527 (1), pp. 105-123 : 106

publication ID	https://doi.org/10.11646/zootaxa.4527.1.9
publication LSID	lsid:zoobank.org:pub:C9D04EAA-61CD-4706-9B54-026C5A7FD98F
DOI	https://doi.org/10.5281/zenodo.5960197
persistent identifier	https://treatment.plazi.org/id/38745B7F-FFAB-FF9C-FF4E-CAFBFEDEC52C
treatment provided by	Plazi (2019-03-27 14:50:02, last updated 2023-10-31 01:06:57)
scientific name	megops Sars, 1862
status

Treatment

Ceriodaphnia megops Sars, 1862

( Figs. 1–2 View FIGURE 1 View FIGURE 2 )

Length about 0.5–0.55 mm, width about 0.7 of length. In lateral view, ephippium almost semicircular, somewhat asymmetrical, stronger narrowing posteriorly; dorsal margin almost straight; ventral margin regularly curved from postero-ventral to antero-ventral angle ( Figs. 1A View FIGURE 1 , 2 View FIGURE 2 A–D). Paired latero-dorsal ridges strongly expressed ( Figs. 1 View FIGURE 1 B– D), extend above dorsal margin as seen laterally ( Figs. 1A View FIGURE 1 , 2 View FIGURE 2 A–D), their dorsal margin slightly and regularly convex. A distinct depression along dorsum separating two halves of ephippium and, respectively, two halves of dorsal plate; sculpture of dorsal plate consisting of a series of longitudinal wrinkles ( Figs. 1 View FIGURE 1 D–E). Sculpture on latero-dorsal ridges low, consisting of small semicircular projections ( Figs. 1 View FIGURE 1 D–F); the external signs of roundedhexagonal air-spaces well-visible under light microscope ( Fig. 2E View FIGURE 2 ). Egg locule smooth, only somewhat extending laterally, with poorly expressed vertical wrinkles ( Fig. 1B View FIGURE 1 , F–G); under optical microscope, surface of locule relatively smooth, with small irregularities ( Fig. 2E View FIGURE 2 ). Rest of ephippium surface covered by low, dense, flattened domes ( Figs. 1 View FIGURE 1 G–H); the external signs of air-spaces well-visible under light microscope ( Figs. 2D, F View FIGURE 2 ). Such air spaces absent in the locule region. Ventral rim of ephippium lacking air spaces, with obscure polygonal reticulation ( Figs. 1H View FIGURE 1 , 2F View FIGURE 2 ).

Figures

FIGURE 1. Ceriodaphnia megops Sars, 1862, ephippial female from Lake Glubokoe, Moscow Area. A, lateral view of female. B, latero-dorsal view of ephippium. C, dorsal view. D, fragment of ephippium dorsal portion, dorsal view. E, dorso-lateral keel, dorsal view. F, its lateral view. G–H, ventral portion of ephippium. Scale bars: 0.1 mm for A–D, H; 0.01 mm for E–G.

FIGURE 2. Ceriodaphnia megops Sars, 1862, ephippial female from Lake Glubokoe, Moscow Area. A–B, ephippial female with a single egg in ephippium, lateral view. C–D, opened ephippium, egg removed. E–F, its central and ventral portion. Scale bars: 0.1 mm.