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Class: Crustacea Order: Phyllopoda

Class: Crustacea Order: Phyllopoda Suborder: Cladocera Family: Chydoridae Alona rectangula Sars Description: Plate 022a. Lateral view of Alona rectangula , with postabdomen extended.

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Class: Crustacea Order: Phyllopoda

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  1. Class: Crustacea Order: Phyllopoda Suborder: Cladocera Family: Chydoridae Alona rectangula Sars Description: Plate 022a. Lateral view of Alona rectangula, with postabdomen extended. Plate 022b. Rostrum and antennule of Alona rectangula. Plate 022c. Postabdomen of Alona rectangula, marginal fasicles extend beyond its margin. Plate 022d. Valve of carapace of Alona rectangula showing striation and ventral spines A common species, Alona rectangula is a component of the pelagic plankton, but usually not in great numbers. Its valves may be striated, reticulated, or smooth. The postabdomen short, slightly enlarged toward apex, angle rounded, with 8-9 marginal denticles or setae. Fasicles (an inner margin of small spines) line the postabdomen, the distal of these extend beyond the margin of the abdomen. The antennule does not extend beyond the rostrum. .

  2. Plate 022a. Lateral view of Alona rectangula, with postabdomen extended.

  3. Plate 022b. Rostrum and antennule of Alona rectangula.

  4. fasicles denticles Plate 022c. Postabdomen of Alona rectangula, marginal denticles and fasicles (an identifiable character) extend beyond its margin.

  5. Plate 022d. Valve of carapace of Alona rectangula showing striation and ventral spines.

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