Synthetonychia acuta
Synthetonychia acuta Forster-1954
Synthetonychia acuta Forster, 1954 (from original description)









Synthetonychia acuta Forster, 1954 belongs to the genus Synthetonychia (Laniatores:Synthetonychiidae).



  • S.a. male(1) (holotype): Dominion Museum, Wellington #2/888[1]
  • S.a. female(1) (allotype): Dominion Museum, Wellington #2/889[1]
  • S.a. female(1) + juvenile(1) (paratypes): Dominion Museum, Wellington #2/890[1]
  • S.a. male(2) (paratypes) Canterbury Museum, Christchurch; #884[1]
  • S.a. male(1) (paratype): Dominion Museum, Wellington #2/891[1]


(from Forster, 1954[1])

  • Color: Reddish-brown.
  • Body: The eyes are separated from the anterior margin of the carapace by a distance equal to 5/12 of the total length of the scute, separated from each other bu a distance equal to 1½x their diameter. The carapace is finely and closely granulate; tergal region with a pattern of single rows of granules. The shape of the genital operculum is shown in Fig. 718, almost 2x as long as it is wide at the base.
  • Genitalia: Adeeagus flattened dorso-ventrally, long, uniformly narrow, with two small lateral spines at ¾ of its length. Dorsal plates present as two strong spines. Ventral plate divided, each half with eight setae (Fig. 717).
  • Chelicerae: Typical.
  • Pedipalps: (Fig. 714). Trochanter with a small tubercle on the disto-dorsal surface as shown in Fig. 715. There is a smaller, more rounded tubercle on the proximo-dorsal surface of the femur and a small mount on the proximo-ventral surface. The disto-dorsal process of the tibia is strong, sharply pointed, and bent. The tarsus is slender and slightly sinuous. Tarsal spine strong, equal in length to 2/3 of the length of the tarsal claw.
  • Legs: Few small tubercles on femora. Tarsal formula Tarsal claws 3 and 4 as shown in Fig. 719, with arolium extending well beyond the median branch, two lateral branches and a small accessory tooth.
  • Measurements (mm): Scute: 1.60x1.24; Legs: 3.61, 5.20, 4.26, 5.35; Pedipalp: 3.05; Chelicera: 0.86
  • Female: Similar in general structure to male. The genital operculum is slightly wider than long. The pedipalps are as shown in Fig. 716. The tibia and tarsus are relatively stouter than in the male, tibial process and tarsal spine absent.
  • Measurements (mm): Scute: 1.60x1.44; Legs: 3.17, 4.32, 3.72, 4.66; Pedipalp: 2.56; Chelicera: 0.84


  • Location: Kahurangi National Park, New Zealand (South island)[1]


  • Forster, 1954:274[1]
  • World Checklist[2]

Additional images - GalleryEdit


  1. 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 Forster, R.R. (1954) The New Zealand harvestmen (sub-order Laniatores). Canterbury Museum bulletin, Christchurch, 2, 1–329.
  2. Kury AB, Mendes AC & Souza DR (2014) World Checklist of Opiliones species (Arachnida). Part 1: Laniatores – Travunioidea and Triaenonychoidea. Biodiversity Data Journal 2: e4094. doi: 10.3897/BDJ.2.e4094

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