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1 April 2002 NOTOMEGARHYNCHUS NAVONAE N. GEN. AND N. SP. (EUCESTODA: TETRAPHYLLIDEA), FROM SKATES (RAJIDAE: ARHYNCHOBATINAE) IN THE SOUTHERN HEMISPHERE
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Abstract

Notomegarhynchus n. gen. (Eucestoda: Tetraphyllidea) is proposed to accommodate Notomegarhynchus navonae n. gen., n. sp. from Atlantoraja castelnaui in Mar del Plata, Argentina. Notomegarhynchus shetlandicum n. comb. from Bathyraja eatonii and B. maccaini in South Shetlands region, Antarctica, is a second species in the genus. Notomegarhynchus belongs to the Echeneibothriinae within the Phyllobothriidae. It can be distinguished from all other tetraphyllidean genera by the structure of the scolex in form of a massive myzorhynchus consisting of a proscolex and an apical organ, both of which are nonretractable and noninvaginable; in addition, there are 4 pedunculated and nonloculate acetabula. Notomegarhynchus shetlandicum is differentiated from N. navonae particularly in details of acetabular and myzorhynchus morphology, arrangement of testes, and shape of eggs. The inclusion of Notomegarhynchus in the Echeneibothriinae requires emendation of the diagnosis of the subfamily to include taxa possessing postvaginal testes. In addition, new terminology is proposed for distinct regions of the scolex.

Verónica A. Ivanov and Ronald A. Campbell "NOTOMEGARHYNCHUS NAVONAE N. GEN. AND N. SP. (EUCESTODA: TETRAPHYLLIDEA), FROM SKATES (RAJIDAE: ARHYNCHOBATINAE) IN THE SOUTHERN HEMISPHERE," Journal of Parasitology 88(2), 340-349, (1 April 2002). https://doi.org/10.1645/0022-3395(2002)088[0340:NNNGAN]2.0.CO;2
Received: 5 March 2001; Accepted: 1 September 2001; Published: 1 April 2002
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