Capillospirura pseudoargumentosa (Appy & Dadswell, 1978) Appy & Anderson, 1982

Synonym: Caballeronema pseudoargumentosus Appy & Dadswell, 1978

Description (after Appy & Dadswell 1978). With characteristics of the genus.

Males:7.7 –10.0 long, 0.073–0.087 wide. Buccal cavity 0.065–0.090 long. Muscular oesophagus 0.277–0.439, glandular oesophagus 1.466–1.931 (Fig. 58 A), and tail 0.087–0.127 long. Nerve ring 0.135–0.225, excretory pore 0.259–0.394 and testis 2.463–4.018, respectively, from anterior end. Right spicule 0.110–0.138 and left spicule 0.492–0.598 long; ratio of right spicule to left spicule length 1:4.5. Right spicule has notch in distal tip; left spicule has ridge beginning near proximal end and extending posteriorly to near distal tip. Four pre-cloacal and six postcloacal papillae. Area rugosa comprises about seven longitudinal rows of cuticular elevations (Fig. 58 B). Caudal alae present.

Females:12.0–18.5 long, 0.089–0.109 wide. Buccal cavity 0.072–0.092 long. Muscular oesophagus 0.292–

0.486, glandular oesophagus 1.456–1.962 long and tail 0.052–0.077 (Fig. 58 C) long. Nerve ring 0.149–0.224,

excretory pore 0.276–0.426, anterior ovary 1.528–2.025 and vulva 5.599–8.493 (Fig. 58 D), respectively, from

anterior end. Eggs 0.038–0.044 x 0.019–0.022. One polar plug with four to10 filaments.

Site: alimentary tract

Hosts: Acipenser brevirostrum (1, 2, 3, 4); Acipenser fulvescens (5); Acipenser oxyrinchus (3); Oncorhynchus mykiss (4)

Distribution: Atlantic

Records: 1. Appy & Dadswell 1978; 2. Appy & Dadswell 1980; 3. Appy & Anderson 1982; 4. Appy & Dadswell 1983 (EX, AT)