Terrestricythere undetermined

Horne, David J., Smith, Robin J., Whittaker, John E. & Murray, John W., 2004, The first British record and a new species of the superfamily Terrestricytheroidea (Crustacea, Ostracoda): morphology, ontogeny, lifestyle and phylogeny, Zoological Journal of the Linnean Society 142 (2), pp. 253-288 : 275-276

TERRESTRICYTHERE SP. ( FIGS 22 , 23 )

Material examined

One adult male, with soft parts dissected in polyvinyl lactophenol stained with methylene blue and sealed in a glass slide, and valves stored in a cavity slide (2003.1049); collected from a marine intertidal rockpool at Gore Point, Porlock Bay , on the southern shore of the Bristol Channel , 51∞14¢N, 3∞37¢W, on 9 March 1978 .

Remarks

Our specimen undoubtedly represents a fourth, hitherto undescribed species of Terrestricythere , but we consider it advisable to leave it in open nomenclature until additional material becomes available for a full description. The carapace shape is similar to that of the other Terrestricythere species but does not quite match any of them in lateral outline; relative to its length it is slightly less high than either T. elisabethae or T. pratensis , but slightly higher than T. ivanovae . The appendages are similar to those of other Terrestricythere species , the only significant differences being noted in the L7 and the hemipenis ( Fig. 7 ). The An1 has five articulated podomeres, as in T. elisabethae and T. pratensis . The L7 is most similar to that of T. elisabethae , bearing one long and one short-terminal claws, in contrast to the one long and one medium length claws of the two Russian species. The larger distal process of the hemipenis has an anvil-shaped protuberance on its outer edge ( Figs 7 , 23 ), similar to that seen in T. pratensis , but with rounded rather than pointed extremities.

Figures

Figure 7. Pictorial key of the known species of Terrestricythere. Comparative illustrations of hemipenes and L7. T. ivanovae and T. pratensis drawn after Schornikov (1969, 1980) respectively.

Figure 22. Terrestricythere sp. Adult male instar. A, right valve external. B, left valve external (Gore Point, Porlock) 2003.1049.

Figure 23. Terrestricythere sp. Adult male instar. L7 and Hem (Gore Point, Porlock) 2003.1049.