Progrillotia, Dollfuss, 1946

Jr, Joaber Pereira & Boeger, Walter A., 2005, Larval tapeworms (Platyhelminthes, Cestoda) from sciaenid fishes of the southern coast of Brazil, Zoosystema 27 (1), pp. 5-25 : 17-18

Other amendments to earlier diagnoses of Progrillotia include the relative length of the bulb and the origin of the retractor muscle. The length/width ratio for the bulbs of species of the genus varies from 1.63 to 2.15 (based on measurements provided by Dollfus (1946, 1969) and those reported in this paper). Thus, it is considered highly variable. A retractor muscle originating at the posterior half of the bulb has been considered diagnostic for Progrillotia ( Campbell & Beveridge 1993, 1994) but a rectrator muscle that originates at the anterior third of the bulb is present in P. dollfusi .

Of all three species known to occur in the genus, only P. pastinacae Dollfus, 1946 , the type species, lacks a basal armature in the tentacle. Only

Pereira J. & Boeger W. A.

TABLE 3. — Metabasal armature. Hooks measurements (μm) of Progrillotia dollfusi Carvajal & Rego, 1983 from nine Sciaenidae fish host species of the coast of Rio Grande do Sul, Brazil. Abbreviations: R, range; <, lowest limit;>, highest limit; χ -, mean; Ir/bf, intercalary rows/bothridial face; Mh/ef, microhooks/external face. For hook identification see redescription and legends of Figures 4 ; 5 .

two characters associated with the scolex are diagnostic for the genus, i.e., bothridia without indentation and a longitudinal band of hooklets of the external face of the tentacular armature interrupted. Thus, differentiation of species of Progrillotia and Grillotia Guiart, 1927 , based on diagnostic characters proposed previously, is not clear.

Even the most recent diagnoses of Grillotia are dubious. Although proposed by Campbell & Beveridge (1994), the absence of a basal armature cannot be considered diagnostic for species of Grillotia since, in the same publication, these authors report a basal armature in G. erinaceus

Figures

FIG. 4. — Progrillotia dollfusi Carvajal & Rego, 1983; A, larva in toto; B, longitudinal section of the bulb showing implantation of the retrator muscle (rm) in the tentacle and glandular cells (gc) (schematic); C, internal face, metabasal armature; D, internal face, basal armature. Abbreviations: 1-4, falciform hooks of principal row half spiral of metabasal armature in the antibothridial face; 1’-3’, in the bothridial face; a, b, intercalar hooks in the antibothridial face; a’, b’, in the bothridial face; Ba, Bb, Be, uncinate hooks of basal

FIG. 5. — Progrillotia dollfusi Carvajal & Rego, 1983; A, metabasal armature, antibothridial face; B, basal armature, antibothridial face; C, metabasal armature, external face; D, basal armature, external face. Abbreviations: mh, microhooks; hh, hastiform hooks. Abbreviations: 1-4, falciform hooks of principal row half spiral of metabasal armature in the antibothridial face; 1’-4’, in the bothridial face; a-c, intercalar hooks in the antibothridial face; a’-c’, in the bothridial face; Bb, Bc, Bd, Be, uncinate hooks of basal armature.