Neastacilla fusiformis (Hale)

King, R. A., 2003, Neastacilla Tattersall, 1921 redefined, with eight new species from Australia (Crustacea: Isopoda: Arcturidae), Memoirs of Museum Victoria 60 (2), pp. 371-416 : 383

Neastacilla fusiformis (Hale)

Astacilla fusiformis Hale, 1946:185–186 , fig. 14.— Hurley, 1961:

264.— Monod, 1970: 1139.

Diagnosis of male. Eyes small and subtriangular. Head with small dorsal elevation anterior to eyes and pair of larger dorsal elevations slightly posterior to eyes, lateral margin of head and pereonite 1 not incised. Pereonites 1–3 with single dorsal elevation and pair of lateral elevations. Pereonite 4 7 times as long as pereonite 3, anteriorly restricted in dorsal view, with pair of dorsal elevations and 2 pairs of dorsolateral elevations at midlength, with single dorsal elevation and pair of dorsolateral elevations posteriorly. Pereonites 5–7 with pair of dorsal evelations and pair of lateral elevations. Pleon slightly longer than pereonites 5–7 combined, with 3 pairs of dorsal elevations and lateral elevations, 2 pairs of lateral wings present, apex acute. 5 mm.

Female. Undescribed.

Distribution. New Zealand, North Island, Huaraki Gulf; subtidal.

Remarks. Neastacilla fusiformis was described by Hale (1946) from a single male specimen taken in a tow net from the Hauraki Gulf, New Zealand. This specimen is similar to the male of N. tuberculata and N. sheardi , however neither of these species possesses a pereonite 4 that is anteriorly constricted in dorsal view or sharp dorsal and dorsolateral elevations.