Two new species of Creptotrema (Digenea: Allocreadiidae) from South America

Abstract

TWO NEW DIGENEAN SPECIES BELONGING IN CREPTOTREMA TRAVASSOS, ARTIGAS AND PEREIRA, 1928 ARE DESCRIBED FROM SPECIMENS STORED IN THE INVERTEBRATE COLLECTION AT THE MUSEUM OF NATURAL HISTORY, GENEVA, SWITZERLAND. CREPTOTREMA LAMOTHEI N. SP. IS DESCRIBED FROM AGENEIOSUS BREVIFILIS VALENCIENNES IN CUVIER AND VALENCIENNES, 1840 (SILURIFORMES: AGENEIOSIDAE), AUCHENIPTERUS NUCHALIS (SPIX AND AGASSIZ, 1829) (SILURIFORMES: AUCHENIPTERIDAE), AND BRYCONOPS MELANURUS (BLOCH, 1794) (CHARACIFORMES: CHARACIDAE) IN THE PARAGUAY RIVER, PARAGUAY. CREPTOTREMA SUCUMBIOSA N. SP. IS DESCRIBED FROM TETRAGONOPTERUS ARGENTEUS CUVIER, 1816 (CHARACIFORMES: CHARACIDAE) IN RÍO AQUARICO, ECUADOR. CREPTOTREMA LAMOTHEI DIFFERS FROM ITS CONGENERS BY HAVING TESTES WITH IRREGULAR RATHER THAN ENTIRE OUTLINES. CREPTOTREMA SUCUMBIOSA DIFFERS FROM ITS CONGENERS BY HAVING A BILOBED RATHER THAN ENTIRE OVARY. BOTH C. LAMOTHEI AND C. SUCUMBIOSA DIFFER FROM THEIR OTHER CONGENERS BY HAVING RELATIVELY LONGER POSTTESTICULAR SPACES IN THEIR BODIES, REPRESENTING 25-30% AND 24-28% OF BODY LENGTH RESPECTIVELY, COMPARED WITH APPROXIMATELY 6-19% IN OTHER SPECIES.