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Some Pycnogonida from Cook Strait, New Zealand, with descriptions of two new species


page 4


Thomson's material was dredged in Lyttelton Harbour (depth unstated); that described by Stock (1954) (a single ovigerous male) was collected at Dana Station 3632, Auckland, New Zealand, in 5–30 metres. The present material extends the range of this species down to about 380 fathoms, and, if material in the writer's collection from the littoral zone of Lyttelton and Otago Harbours be also considered, the animal's range may be considered to extend from low water spring tide mark to 380 fathoms, and geographically from Auckland to Dunedin. The material in collections 48, 49 and 55 was all taken within a period of two days; none of the males was ovigerous, but numerous large ova could be seen in the femoral ovaries of the females.

Stock (1954) notes that in his specimen "the chelifore scape has not such a prominent dorsal tubercle in its middle as figured by Thomson". It should be pointed out that there is some variation in this character, but a tubercle or clump of spines is present in this position in all the material examined. Similarly the tubercles on which the genital apertures are situated are much higher in the males than the females. As is usual in the genus the ovigers are more strongly developed in the males.