Neastacilla algensis Hale, 1924

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 : 375

Neastacilla algensis Hale

Neastacilla algensis Hale, 1924: 213 , fig. 3.— Hale, 1929: 313, fig. 314.— Poore et al., 2002: 258.

Astacilla algensis . — Hale, 1946: 174, fig. 7A.— Monod, 1970: 1139.

Diagnosis of female. Eyes small and triangular. Head with rounded dorsal elevation slightly posterior to eyes; lateral margin of head and pereonite 1 not incised. Pereonites 1–7 dorsally smooth, without distinct lateral extensions. Pereonite 4 extremely elongate (more than 10 times as long as pereonite 3). Pleon longer than pereonites 5–7 combined, lateral wings absent, apex truncate. 12.3 mm.

Male. Undescribed.

Distribution. Australia: South Australia; subtidal.

Remarks. Neastacilla algensis is diagnosed here with reference to the illustrations of Hale (1924, 1929), who described a single female specimen. The elongate, truncated pleotelson and extremely elongate pereonite 4 separates this species from all others in Neastacilla . It should be noted that the specimen drawn by Hale (1924, 1929) was probably an immature female as he described the oostegites as not fully developed.