AJTMH Transactions of the Royal Society of Tropical Medicine and Hygiene
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Am. J. Trop. Med. Hyg., 8(4), 1959, pp. 456-472
Copyright © 1959 by The American Society of Tropical Medicine and Hygiene

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The Renal Ridge as a Reliable Character for Separating Taphius Glabratus from Taphius Tenagophilus*,{dagger},

W. Lobato Paraense AND Newton Deslandes
Instituto Oswaldo Cruz and Instituto Nacional de Endemias Rurais, Brazil

This paper is based on the comparative study of 15,516 specimens of Taphius glabratus from 36 localities and 12,776 of Taphius tenagophilus from 31 localities. A description of the renal region of both species is given, and it is concluded that they are distinguishable by the presence (in T. glabratus) or absence (in T. tenagophilus) of a ridge along the middle line of the membrane which covers ventrally the renal tube.

The ridge makes its appearance in specimens of about 10 mm in shell diameter and then gradually develops as the animal grows. It rises from a pigmented stripe which represents its forerunner in the small specimens under 10 mm in diameter.

The renal ridge is defined, both anatomically and histologically, and is shown to be a reliable diagnostic character of T. glabratus subject to age variation.

The unridged renal membrane of T. tenagophilus is also defined, with especial reference to its variation and to some unusual characteristics that may lead the taxonomist to confuse T. tenagophilus and T. glabratus.


* This study was aided by a grant from the Conselho Nacional de Pesquisas of Brazil.


{dagger} Following the Rules of Nomenclature' we use the generic name Taphius as the senior synonym of Biomphalaria, Tropicorbis, Platytaphius, Afroplanorbis and Australorbis. The species name tenagophilus refers to the large carinate Brazilian planorbid, until recently called nigricans by us; this nomenclature problem will be discussed elsewhere.






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Copyright © 1959 by the American Society of Tropical Medicine and Hygiene.