Plagiorhynchus (Plagiorhynchus) crassicollis Luhe 1911

• Main Author: Dimitrova, Zlatka
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2009
• Subjects: Biodiversity; Taxonomy; Animalia; Acanthocephala; Palaeacanthocephala; Polymorphida; Plagiorhynchidae; Plagiorhynchus; Plagiorhynchus crassicollis; Charadrius hiaticula
• Online Access: https://doi.org/10.5281/zenodo.3792492; http://treatment.plazi.org/id/63152931FFE2FF9AE791FC0A787BFCB0

Plagiorhynchus ( Plagiorhynchus ) crassicollis (Villot, 1875) Lühe, 1911 Syn. Plagiorhynchus lanceolatus (von Linstow, 1876) Lühe, 1911 Material studied. BMNH 1928.2.17.91, from small intestine of Charadrius hiaticula L., Great Britain (detailed locality data not known), whole-mount of 2 specimens (1 slide) (material listed by Baylis, 1928); BMNH 1936.8.17.124-140, from small intestine of C . hiaticula , Weymouth, Dorset, England, wet material (material listed by Baylis 1939). Description (Fig. 1) Based on 10 male and 12 female specimens from Charadrius dubius , Weymouth, Dorset, England (BMNH 1936.8.17.124-140). General. Trunk elliptical, almost ovoid, narrowing posteriorly. Transverse vessels of lacunar system form dense reticulum of large polygons. Proboscis cylindrical, situated at angle to axis of trunk. Proboscis armament consists of 19-20 longitudinal rows of 13-14 (12) hooks; first 8 (9) hooks longest, next 2 smaller and last 3 hooks smallest; all hooks with posteriorly directed roots. Neck short (partly or completely withdrawn in some specimens), trapezoidal. Proboscis receptacle doublewalled. Lemnisci band-shaped (bifurcate in single specimen), longer than proboscis receptacle. Male. Trunk 2.4-5.2 long, 1.0-1.64 wide. Proboscis (completely everted in only 2 specimens) 0.56-0.62 long, 0.16 wide. Length of first 8 hooks – blade 32-42 µm, root 32-44 µm; length of next 2 hooks – blade 29 µm, root 25-32 µm; length of last 3 hooks – 25-27 (29) µm, root 13-22 µm. Neck (in 2 specimens) c .0.1 long. Proboscis receptacle 0.70-0.95 long and 0.16-0.25 wide. Lemnisci 1.0-2.6 long, 0.09-0.15 wide. Testes oval to spherical, 0.30-0.80 long, 0.23-0.41 wide, situated in tandem and slightly overlapping one another, in middle region of trunk. Cement glands 6 in number, of different lengths, 0.30-0.95 long, situated immediately posterior to hind testis. Duct of cement glands 0.35-0.65 long. Genital bursa (everted in single specimen) 0.25 long, 0.30 wide. Female. Trunk 2.64-7.0 long, 1.21-2.9 wide. Proboscis (completely ...