Studies on Anacondas III. A Reappraisal of Eunectes beniensis Dirksen, 2002, from Bolivia, and a Key to the Species of the Genus Eunectes Wagler, 1830 (Serpentes: Boidae)

Lutz Dirksen, Wolfgang Böhme


Eunectes beniensis Dirksen, 2002 is a recently discovered anaconda species from Beni Province, Bolivia. Based on morphological and molecular genetic evidence, E. beniensis is closer related to E. notaeus and E. deschauenseei than to E. murinus. The phylogenetic relationships within Eunectes are currently best described as: E. murinus [E. beniensis (E. deschauenseei, E. notaeus)]. E. beniensis is easily recognizable by its brown to olive-brownish ground color in combination with five head stripes and less than 100 large dark, solid dorsal blotches which always lack lighter centers. An identification key for the species of Eunectes is provided.


Reptilia; Squamata; Serpentes; Boidae; Eunectes beniensis; taxonomy; identification key

Full Text:



Anonymous (1963), «Hybrid anacondas», Anim. Kingdom, 66, 31.

Dirksen L. (1995), Zur Reptilienfauna Boliviens unter spezieller Berücksichtigung taxonomischer und zoogeographischer Aspekte. MSc Thesis, Univ. of Bonn, Bonn.

Dirksen L. (2000), Monographische Revision der Gattung Eunectes Wagler, 1830 (Serpentes, Boidae). PhD Thesis, Univ. of Bonn, Bonn.

Dirksen L. (2002), Anakondas: monographische Revision der Gattung Eunectes Wagler, 1830 (Serpentes, Boidae), Natur und Tier Publishing House, Münster.

Dirksen L. and Böhme W. (1998a), «Studien an Anakondas. I: Indizien für natürliche Bastardierung zwischen der Großen Anakonda Eunectes murinus und der Paraguayanakonda Eunectes notaeus in Bolivien, mit Bemerkungen zur Taxonomie der Gattung Eunectes», Zool. Abh. Staatl. Mus. Dresden, 4, 45 – 58.

Dirksen L. and Böhme W. (1998b), «Studien an Anakondas. II: Zum taxonomischen Status von Eunectes murinus gigas (Latreille, 1801) (Serpentes: Boidae), mit neuen Ergebnissen zur Gattung Eunectes Wagler, 1830», Salamandra, 34(4), 359 – 374.

Dirksen L., Buongermini E., Strüssmann C., and Waller T. (1998), «Protective balling-posture behavior of the genus Eunectes Wagler, 1830 (Serpentes, Boidae)», Herpetol. Nat. Hist., 6(2), 151 – 155.

Dunn E. R. and Conant R. (1936), «Notes on anacondas, with descriptions of two new species», Proc. Acad. Sci. Philadelphia, 88, 503 – 506.

Strimple P. D., Puorto G., Holmstrom W. F., Henderson R. W., and Conant R. (1997), «On the status of the anaconda Eunectes barbouri Dunn and Conant», J. Herpetol., 31(4), 607 – 609.

Veinert T. and Belluomini H. E. (1981), «Observacaes do comportamento e da cópula heteróloga de sucuris em captiveiro — Eunectes murinus murinus (Linnaeus) e Eunectes notaeus Cope, 1862», Mem. Inst. Butantan, 44/45, 391 – 402.



  • There are currently no refbacks.

You can subscribe to the print or electronic version of the journal on the site of EastView Company. If you have any questions, please write to the email