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Further studies on the occurrence of freshwater Microturbellaria in the British Isles
Author(s) -
YOUNG JOHNSTONE O.
Publication year - 1972
Publication title -
freshwater biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.297
H-Index - 156
eISSN - 1365-2427
pISSN - 0046-5070
DOI - 10.1111/j.1365-2427.1972.tb00054.x
Subject(s) - anatomy , biology , penis , gubernaculum , endotherm , zoology , physics , differential scanning calorimetry , thermodynamics
Summary Macrostomwn johni sp. nov. from Llyn Cwellyn, N. Wales is described. The species has been recorded from the vegetational littoral in December and February only. The main distinguishing criterion is the penis stylet which consists of a funnel, about 80‐98 μm in length in slightly squashed specimens, curved in two planes and with a sub‐terminal distal opening, the distal end is blunt and cowl (hood) shaped. Other features include the presence of sensory hairs and rhabdoids all over the body, ‘Haft‐papillen’, and eyes. Rhammite tracks are weakly developed. The testes are elongate and the ovaries are compact, though slightly indented, and smaller than the testes. A very short ductus intervesicularis is present. The vagina is short. A ‘Verschlussap‐parat’ is present but poorly developed.