Corynosoma magdaleni Montreuil, 1958

Leidenberger, Sonja, Boström, Sven & Wayland, Matthew T., 2019, Morphological observations on three Baltic species of Corynosoma Lühe, 1905 (Acanthocephala, Polymorphidae), European Journal of Taxonomy 514, pp. 1-19 : 7

Corynosoma magdaleni Montreuil, 1958

Figs 3–4 , Table 2

Diagnosis

Corynosoma magdaleni is characterised by a body 3.67–5.11 mm long in females and 2.53–4.39 mm long in males, a slender trapezoid neck structure, spines covering most of fore-trunk, spines covering more than half the length of ventral surface of hind-trunk, proboscis with 16–20 longitudinal rows of hooks in both genders with 8–11 hooks in each row in females and 8–10 hooks in each row in males.

Material examined (see Table 1 and Fig. 1 )

FINLAND • 1 ♀; Åland, Bothnian Sea ; HWML- 39480-1141-2 • 1 ♂; Åland, Bothnian Sea ; HWML- 39480-1041-3 .

SWEDEN • 4 ♀♀, 2 ♂♂; Stocka / Gävleborgs Province, Bothnian Sea ; SMNH-162973 • 1 ♂; Skärplinge/ Uppsala Province, Bothnian Sea ; SMNH-162973 • 1 ♀, 1 ♂; Luelå / Norrbottens Province, Bothnian Bay ; SMNH-162973 • 1 ♀; Tistersöarna , Luleå/Norrbottens Province, Bothnian Bay ; SMNH-162973 .

Figures

Fig. 3. SEM micrographs of Corynosma magdaleni from grey seals, Halichoerus grypus, in the Swedish Baltic Sea. a. ♀, entire worm, ventro-lateral view, from the Bothnian Bay, Norrbotten, Luleå. Ventral spination extends over more than half the length of the hind-trunk. b. Proboscis of a ♀ showing the spineless neck and the arrangement of the hooks. c. Posterior end of a ♂ showing the extended copulatory bursa. d. Posterior end of a ♀ in which the gonopore has been retracted into the gential vestibule.

Fig. 4. LM micrographs showing posterior end of Corynosoma magdaleni from a grey seal, Halichoerus grypus, from the archipelago of Åland (Finland). a. ♂ showing everted bursa and genital spine (arrows) (HWML 39480–1041-3). b. ♀ (HWML 39480–1141-2).

Fig. 1. Map of sampling localities.