Náyade de Brechmorhoga pertinax (Odonata: Libellulidae)

Abstract

THE NAIAD OF BRECHMORHOGA PERTINAX HAGEN IS DESCRIBED AND ILLUSTRATED. A COMPARISON TO OTHER ALREADDY DESCRIBED NAIADS OF THE GÉNUS IS MADE. B. PERTINAX POSESSES A TRIANGULAR LIGULA WITH 12 SETAE ON THE PREMENTUM AND 7-9 SETAE ON THE LABIAL PALPI; THE INFERIOR MARGIN OF THE PROPIMERON IS STRAIGHT, THE ABDOMEN EXHIBITS DORSAL PROTUBERANCES WELL DEVELOPED ON TERGITES 2.-6, AND LATERAL SPINES ONLY ON 8-9. IT INHABITS LOTIC ENVIROMENTS IN SITES WHERE THE WATER FLOW IS RAPID. AS A NAIAD, B. PERTINAX SHOWS CLOSE RESEMBLANCE TO THAT OF B. VIVAX CALVERT.