Distribution Patterns and Development of Sieve-Pores in Two Recent Ostracode Species

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Abstract
Normal sieve-pore distribution patterns of the living brackish-water ostracod species Loxoconcha elliptica and Cyprideis torosa in molt and adult stages of right and left valves in both sexes show a fairly constant pore arrangement, with some number and position variations. A direct relationship was found between instar stadia and the number of pores. The development of these consistent pore patterns throughout ontogeny was traced, and may indicate how epidermal cells producing pores divide in each phase of growth.

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