Quadrisegmentum triangulum Hirayama, 1988

Hughes, Lauren Elizabeth & Takeuchi, Ichiro, 2016, Two New Species of Quadrisegmentum (Phtisicidae: Amphipoda: Crustacea) from the Central Indo-Pacific, with Notes on the Type Species Q. triangulum Hirayama, 1988, Records of the Australian Museum 68 (5), pp. 231-244 : 236

publication ID	https://doi.org/ 10.3853/j.2201-4349.68.2016.1663
persistent identifier	https://treatment.plazi.org/id/038D87EB-8208-FFE8-FCED-FF15FABECFF5
treatment provided by	Carolina
scientific name	Quadrisegmentum triangulum Hirayama, 1988
status

Treatment

Quadrisegmentum triangulum Hirayama, 1988 View in CoL

Fig. 5 View Figure 5

Quadrisegmentum triangulum View in CoL — Hirayama, 1988: 1090– 1093, figs. 1–3.

not Quadrisegmentum triangulum View in CoL . — Guerra-Garcia, 2003: 104–105, fig. 9a. — Guerra-Garcia, 2006: 440, fig. 39. —Guerra-Garcia & Lowry, 2009: 323–325 (= Q. yirrgay View in CoL sp. nov.).

Type material examined. Paratypes 1 ♂ (no. 1) 8 mm, and 2 ♀♀ (nos. 2–3) 5.2 mm and unmeasured, NTM Cr. 00447, taken from gorgonian host, Isis hippuris Linnaeus, 1758 in 18 m on west islet of Ashmore Reef , Northwest Australia (12°14.28'S 122°59.14'E.), 24 July 1986, coll. H. K. Larson. (Holotype carcass and slide material not found, presumed lost) GoogleMaps .

Type locality. Ashmore Reef , Timor Sea, north-west Western Australia (12°14.28'S 122°59.14'E) GoogleMaps .

Remarks. Examination of Q. triangulum type material recognizes the absence of projections on pereonite 2 in both sexes and also records the presence of anterolateral projections on the male pereonite 3. These anterolateral projections on pereonite 3 were not recorded in the original description by Hirayama (1988). Additional material attributed to Q. triangulum by the first and second reviewer from Queensland, Australian and Papua New Guinea ( Guerra-García, 2003, 2006), contained specimens where pereonite 2 projections were observed on males and females. This latter material was reassessed as part of this study and determined to be a separate species. These records are transferred to the new species name Q. yirrgay described below. The name Quadrisegmentum triangulum is once again restricted to the original type material and presently known only from the type locality.

Distribution. Ashmore Reef ( Hirayama, 1988).