closed petasma
The lateral lobes are heavily sclerotized, sometimes making structure virtually rigid, with the ventral costae situated ventromesially, almost abutting, and delimiting a small, sometimes extremelyso, space; lateral lobe usually produced distally into lateral sprouts or horns. See: petasma [Perez Farfante and Kensley, 1997].

Crustacea glossary. . 2011.

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  • semi-closed petasma — The lateral lobes are rather flexable, markedly folded, supported by strong ribs, with the ventral costae approaching rather closely, delimiting moderately large space, narrowly open distally where usually overlapped by well developed distomedian …   Crustacea glossary

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