open petasma
The lateral lobes are quite flexible, partially or entirely extended laterally, with the ventral costae not or barely turned ventrally. See: petasma [Perez Farfante and Kensley, 1997].

Crustacea glossary. . 2011.

Look at other dictionaries:

  • semi-open petasma — The lateral lobes are flexable but folded, with the ventral costae distinctly turned ventromesially, delimiting relatively ample space extending from proximal to distal ends. See: petasma [Perez Farfante and Kensley, 1997] …   Crustacea glossary

  • 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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