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mesobranchial
mesobranchial adj. 
/ˌmɛzə(ʊ)ˈbraŋkɪəl/, /ˌmiːsə(ʊ)ˈbraŋkɪəl/, /ˌmiːzə(ʊ)ˈbraŋkɪəl/, /ˌmɛsoʊˈbræŋkiəl/, /ˌmɛzoʊˈbrɑŋkiəl/, /ˌmɛsoʊˈbrɑŋkiəl/ Zoology designating the lobe of the carapace of a crab which covers the middle part of the gill system.
Brit. /ˌmɛsə(ʊ)ˈbraŋkɪəl/
, /ˌmɛsə(ʊ)ˈbraŋkɪəl//ˌmɛzə(ʊ)ˈbraŋkɪəl//ˌmiːsə(ʊ)ˈbraŋkɪəl//ˌmiːzə(ʊ)ˈbraŋkɪəl/U.S. /ˌmɛzoʊˈbræŋkiəl/
, /ˌmɛzoʊˈbræŋkiəl//ˌmɛsoʊˈbræŋkiəl//ˌmɛzoʊˈbrɑŋkiəl//ˌmɛsoʊˈbrɑŋkiəl/ΚΠ
1877 T. H. Huxley Man. Anat. Invertebrated Animals vi. 343 The branchial region is sub-divided into epibranchial, mesobranchial, and metabranchial lobes.
1935 Amer. Midland Naturalist 16 382 Mesobranchial areolations very small and triangular.
1987 Micronesica 20 171 They differ from other Indo-West Pacific Petrolisthes species by having two epibranchial spines on each carapace margin combined with unarmed mesobranchial margins.
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