Tajikacelis macrostomoides, Curini-Galletti & Schockaert, 2021

Curini-Galletti, Marco & Schockaert, Ernest R., 2021, Six new species ofArchimonocelididae Meixner, 1938 (Platyhelminthes, Proseriata) from the Pacific, with proposal of a new genus, Zootaxa 4965 (3), pp. 515-528 : 519-520

Tajikacelis macrostomoides n. sp.

( Fig. 1B , 2B , 4A–D , 10B )

Diagnosis. Species of Tajikacelis with a strongly curved stylet, 45–49 μm long (N=3), with a proximal opening of 13–16 μm, narrowing to about 5 μm at around 1/3 of its length and 3–4 μm wide at the distal end, which is truncated. The testes are packed in two rows with 7–8 pairs in front of the ovaries and more than 30 pairs between the level of the ovaries and the basis of the pharynx. Female duct muscular prepenially and widened postpenially; a vagina was not seen.

Occurrence. Arrawarra, NSW, Australia in poorly sorted coarse sand in a permanent tide pool among rocks S. of the headland (30°03’38.8”S; 153°12’12.8”E) (type locality)(30 October 1997 by E. R.S). Kirra Beach , Queensland, Australia (28°09’58.7”S; 153°31’58.2”E), lower intertidal close to rocks, medium-coarse sand (30 August 1996 by M.C-G.) .

Material studied. Three animals studied alive and mounted, one of which holotype ( QM G238522 ) , the remaining paratypes ( CZM824-825 ) . One animal studied alive and mounted as whole mount from Kirra Beach ( CZM826 ) .

Etymology. The specific epithet reflects the similarity between the stylet of the new species and those of many species of Macrostomum Schmidt 1848 (Platyhelminthes, Macrostomida ).

Figures

FIGURE 1. General appearance of the species of Tajikacelis. (A) T. tajikai n. sp. (B) T. macrostomoides n. sp. (C) T. nematoplanoides n. sp. (D) T. artoisi n. sp. (E) T. acuta n. sp. (F) T. truncata n. sp. (G) T. itoi (after Tajika 1981).

FIGURE 2. Genital organs of (A) T. tajikai n. sp. (B) T. macrostomoides n. sp. (C) T. nematoplanoides n. sp. (D) T. artoisi n. sp. (E) T. acuta n. sp. (F) T. truncata n. sp. (G) T. itoi (after Tajika 1981).

FIGURE 4. Tajikacelis macrostomoides n. sp. (A) The copulatory stylet in the holotype (B, C) copulatory stylet in two paratypes. (scale bar = 20 µm) (D) micrograph of the copulatory stylet of the specimen from Kirra Beach. Tajikacelis nematoplanoides n. sp. (E1–E2) Micrograph and drawing of the copulatory stylet in the holotype (scale bar = approximately 20 µm).

FIGURE 10. The copulatory stylets in the holotypes of the species of Tajikacelis n. gen. (scale bar = 20 µm).