Zyxibothrium kamienae Hayden and Campbell, 1981

Bueno, Veronica M. & Caira, Janine N., 2023, Phylogenetic relationships, host associations, and three new species of a poorly known group of “ tetraphyllidean ” tapeworms from elasmobranchs, Zootaxa 5254 (1), pp. 30-50 : 38-39

Zyxibothrium kamienae Hayden and Campbell, 1981 emended

( Fig. 6A–H )

Type and only known host: Malacoraja senta (Garman) , smooth skate; ( Rajiformes : Rajidae Bonaparte ).

Type locality: Gulf of Maine, Maine, USA.

Site of infection: Spiral intestine.

Specimens examined: Scolex prepared for SEM retained with JNC at the University of Connecticut. Sequence data: OQ186459 (hologenophore, LRP No. 9810 [BV-3-1, VB187])

Emendation. The description of this species presented by Hayden and Campbell (1981) should be emended to include the following information on the configuration of the microtriches of the scolex obtained from examination of one scolex with SEM ( Fig. 6A ).

Apex of scolex ( Fig. 6B ) and distal bothridial surfaces ( Fig. 6C ) densely covered with very long slender aristate gladiate spinitriches interspersed with gladiate spinitriches, filitriches not observed; proximal surfaces of anterior loculus ( Fig. 6F ) and margins of paired loculi ( Fig. 6G ) densely covered with very long slender aristate gladiate spinitriches interspersed with gladiate spinitriches, filitriches not observed; proximal surface of posterior loculus ( Fig. 6H ) densely covered with long slender gladiate spinitriches interspersed with acicular filitriches; proximal surface of bothridium away from locular margins ( Fig. 6E ) and scolex proper ( Fig. 6D ) densely covered with gladiate spinitriches, filitriches not observed.

Remarks. The scolex examined with SEM here is the one examined by Caira et al. (2001). However, after adding an additional 10 nm of gold/palladium to the specimen, we were able to characterize the microtriches in more detail and have followed the unified terminology for microtriches advanced by Chervy (2009). In addition to providing more detailed descriptions of the microtriches on the proximal and distal bothridial surfaces, we have now characterized the microtriches on the surfaces of the apex of the scolex and the scolex proper.

Figures

FIGURE 6. Scanning electron micrographs of Zyxibothrium kamienae Hayden and Campbell 1981. (A) Scolex, small letters indicate location of details in micrographs B–H. (B) Apex of scolex densely covered with very long slender aristate gladiate spinitriches interspersed with gladiate spinitriches, filitriches not observed. (C) Distal bothridial surface densely covered with very long slender aristate gladiate spinitriches interspersed with gladiate spinitriches, filitriches not observed. (D) Posterior region of scolex proper densely covered with gladiate spinitriches, filitriches not observed. (E) Proximal bothridial surface away from locular margins densely covered with gladiate spinitriches, filitriches not observed. (F) Proximal surface of anterior loculus densely covered with very long slender aristate gladiate spinitriches interspersed with gladiate spinitriches, filitriches not observed. (G) Proximal surface of paired loculi densely covered with very long slender aristate gladiate spinitriches interspersed with gladiate spinitriches, filitriches not observed. (H) Proximal surface of posterior loculus densely covered with long slender gladiate spinitriches interspersed with acicular filitriches.