Folia Parasitologica, vol. 60 (2013), issue 4

Folia Parasitologica 60[4] 353-358 (2013) | 10.14411/fp.2013.036

Huffmanela markgracei sp. n. (Nematoda: Trichosomoididae) from buccal cavity of Atlantic sharpnose shark, Rhizoprionodon terraenovae (Carcharhiniformes: Carcharhinidae), in the northwestern Gulf of Mexico off Texas

Carlos F. Ruiz, Stephen A. Bullard
Aquatic Parasitology Laboratory, Department of Fisheries and Allied Aquacultures, College of Agriculture, Auburn University, Auburn, Alabama, USA

Abstract: Eggs of Huffmanela markgracei sp. n. infected one of three Atlantic sharpnose sharks, Rhizoprionodon terraenovae (Richardson) (Carcharhiniformes: Carcharhinidae) captured by bottom long-line in the northwestern Gulf of Mexico off Padre Island, Texas. Eggs in the skin formed sinuous tracks (1-8 eggs wide; 1-4 eggs deep; 150 eggs/mm2) occupying a swath of the skin 22 cm × 2 cm on the tongue, branchial arches and the dorsal surface of the buccal cavity. Eggs had transverse eggshell ridges (branching and non-branching), had shells that were clear, amber or brown, and measured 90-113 µm (x = 102 ± 4; n = 190) long, 38-54 µm (43 ± 3; 190) wide, 3-5 µm (4 ± 0; 190) in eggshell thickness with protruding polar plugs 8-12 µm (10 ± 1; 190) wide. Apparently fully developed larvae in eggs were 255-335 µm (299 ± 26; 30) long, 8-10 µm (9 ± 1; 30) wide, and in-folded 5-6 (6 ± 0; 30) times. Some of these larvae were emerging from eggs in the skin. The new species differs from congeners by the combination of having a  large, spindle-shaped egg, transverse eggshell ridges, an envelope that is smooth, tightly-apposed to the eggshell and surrounds the entire eggshell inclusive of the polar plugs, and a large larva. This is the first report of a species of Huffmanela Moravec, 1987 from a chondrichthyan in the Gulf of Mexico and from a shark not assigned to Carcharhinus.

Keywords: nematode, eggs, skin, taxonomy

Received: January 7, 2013; Accepted: February 24, 2013; Published: September 19, 2013


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