Discophrya ordesae Fernández-Leborans & Valladolid, 2017

Fernández-Leborans, Gregorio, Valladolid, María, Arauzo, Mercedes, Millán, Andrés, Gabilondo, Regina, Gallardo, Manuela, Jiménez, Luis & Ramírez-Ballesteros, Mireya, 2017, Epibionts on Hydraena species (Coleoptera: Hydraenidae) from high mountain rivers of Pyrenees (Ordesa and Monte Perdido National Park), with the description of a new species, Zootaxa 4317 (1), pp. 79-94 : 85-88

Description of Discophrya ordesae Fernández-Leborans & Valladolid , sp. n.

Derivatio nominis: from Ordesa valley (Pyrenees, Comunity of Aragón, Spain).

Ciliate suctorians located mainly in ventral areas of abdomen and thorax (in this case between legs), in number of 1–2, rarely 3 individuals per basibiont ( Figure 5 ). Fanlike body (222–238 µm long, and 255–277 µm wide) with distal end uniformly rounded and proximal end strait and connected to the stalk ( Figures 6–7 ).

Body very flattened. Distal edge of the lorica double with capitate tentacles inserted (135–148), of variable length ( Figures 8–9) as they are retracted or not (5.3–15.5 µm retracted; 27.2–102.2 extended).

Stalk short (86.3–97.2 µm) and thick. Distal end of stalk joining to the basibiont by a slightly expanded region. Proximal part of the stalk continued by a lorica (stylotheca) with thick edge and strong surrounding the cellular body. Macronucleus located in the middle of body (Figure 10–11), oval or rounded (100.4–125 µm long, 109.3– 127 µm wide).

In several specimens, larval kineties may be observed in the centre of the body ( Figure 12 ), with the cilia protruding laterally, probably constituting the development of the swarmer on brood pouch ( Table 4). Evaginative budding.

Registration numbers: MNCN 39.04/5-39.04/7.

Distribution. It was found attached to ventral area, mainly in abdomen, of Hydraena delia and H. truncata ( Coleoptera : Hydraenidae ). From Yaga river ( Table 2).

Figures

FIGURES 5. Hydraena delia with two individuals of Discophrya ordesae sp. n. attached in the ventral sclerites (circle).

FIGURE 6. Scheme of Discophrya ordesae sp. n.; ma: macronucleus, mi: micronucleus, s: stalk, t: tentacles.

FIGURE 7. Discophrya ordesae sp. n. A complete suctorian showing the shape of the body.

FIGURE 12. Discophrya ordesae sp. n. A ciliate showing the growth lines of the lorica, and inside the external morphology of the future swarmer and their kineties on the brood pouch. Square: detail of swarmer, c: cilia.