[2][3] Forster placed it as subspecies of Algidia chiltoni, noting that "although the distribution is sympatric, there is evidence of interbreeding between these two forms in the Levin [Horowhenua] district".

The tubercles (pointed protuberances) on the eyemound of A. c. longispinosa males are longer and fewer than in either of these taxa.

These are thicker in A. c. chiltoni than in the other two subspecies, with A. c. longispinosa having fewer tubercles on the rear margin of the scutum and the first two free tergites than A. c.

[1] The femur of the male pedipalp has a proximo-dorsal (upper surface, near the body) swelling with a spinous tubercle similar to A. c. chiltoni, but not present in A. c. oconnori.

[1] This species is recorded from Levin (Horowhenua district) and the Wairarapa region in the lower North Island of New Zealand.