Eukalyptorhynchia with 2 eyes (in some species may be partly or completely reduced), long sensitive cilia on anterior and posterior body ends; proboscis cone-shaped, its proximal part with (pseudo-?) cuticular tunica. Tunica consists of 2 parts — belt-shaped structure (or — simply — “belt”) and apex (Fig. 2: 3–10). Belt may be homogeneous (spiny, punctated, smooth), or non-homogeneous (with knob-shaped thickenings). Apex is always smooth. Musculo-cutaneous sac except for circular and longitudinal fibres, has diagonal row of muscles (Fig. 79: 3). Pharynx, as a rule, in anterior body third, with regular thickenings of ducts of pharyngeal glands (usually seen in vivo as 12 brown, knob-shaped structures around pharynx body from ventral side), without muscular knobs (Color microphotographs 1; 2: 1; 10: 1, 2; 19). Mouth opening surrounded by clearly distinguished “mouth plate” (Color microphotograph 1). Male copulatory organ of conjuncta type with clearly developed bulbus and papilla; as a rule, with cuticular hooks (in some species fully or partly reduced). Four, three or two hooks of different size, form and structure, with oval or irregular basal openings and blind distal ends (Fig. 2: 17–26), asymmetrically attached to penis at border between bulbus and papilla, from ventral side of organ. Hooks not related to realize of sperm or any secretion. Bulbus wall with homogeneously (most common case) or non-homogeneously developed muscle layers. Ductus ejaculatorius opens at distal tip of papilla, its proximal enlargement, located at the bulbus basis, well developed, receives secretion of external and internal prostatic glands and spermatozoa and therefore, functioning as vesicula granulorum. Two large vesiculae seminalis of different form and size join together right before entering bulbus, open to vesicula granulorum by short single duct. Protonephridial system with numerous lateral excretory pores from both sides of caudal body end; in most species — with caudal transversal junction of the lateral trunks. Testes, ovaries, vitellaria paired. With bursa copulatrix and uterus, canal of bursa copulatrix with strong sphyncter, uterus may contain single cocoon.
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