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microseptum
microseptum n.
Brit. 
/ˌmʌɪkrə(ʊ)ˈsɛptəm/
, /ˌmʌɪkrə(ʊ)ˈsɛptəm/U.S. /ˌmaɪkroʊˈsɛptəm/
Zoology rare (perh. Obsolete) a small imperfect or sterile septum or mesentery of a cnidarian./ˌmaɪkroʊˈsɛptəm/ΚΠ
1890 Cent. Dict. Microseptum, a small imperfect or sterile septum or mesentery of an actinozoan.
1968 J. Bouillon in M. Florkin & B. T. Scheer Chem. Zool. II. ii. i. 92 Fertile macrosepta and sterile microsepta can be distinguished.
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as lemmas