A revision of the British species of the genus Phthiracarus Perty 1841 (Cryptostigmata: Euptyctima) Parry, B. W. Bull. British Mus. nat. Hist., Zool. ser. 1979 35 323 363 Arachnida Euphthiracaridae Hoplophora CoL Animalia Sarcoptiformes 36 357 Arthropoda species sphaerula  Sea Cliff, New York, USA [Type series apparently lost]