Perotripus keablei Guerra-Garcia 2006
Creators: name: Guerra-García, José M.
name: Lowry, J. K.
Publisher: name: Zenodo
Year: 2009
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Amphipoda
Caprellidae
Perotripus
Perotripus keablei

description: <i>Perotripus keablei</i> Guerra-García, 2006 (Fig. 13) <i>Perotripus keablei</i> Guerra-García, 2006: 431, figs 24–27. <b>Material examined</b>. Holotype male, 5.2 mm, AM P61747 (QLD 6). Paratypes: 1 female, AM P61748 (QLD 14). See station list for occurrences (Lowry &amp; Myers 2009) and Guerra-García (2006) for complete material examined. <b>Type locality.</b> Off Mangrove Beach, Blue Lagoon, Lizard Island, Queensland (14º40’S 145º28’E), sand, 1.5 m depth. <b>Description.</b> Based on holotype male, 5.2 mm and female paratype, 2.7 mm. <b>Head</b> and pereonites slender. <i>Head/pereonite 1</i> fused (suture almost absent); dorsal margin convex; eye large, distinctive. <i>Antenna 1</i> reduced; slender, 0.15 x body length; peduncle article 2 longest, article 3 straight; accessory flagellum absent; flagellum 0.33 x peduncular length, with 2 articles. <i>Antenna 2</i> 0.6 x antenna 1 length, slender; peduncle with several feeble setae; flagellum about 1/5 (0.2 x) of peduncular length, with 2 articles. <i>Labrum</i> notched, forming rounded quadrilateral projections. <i>Mandible</i> right incisor with 6 teeth, right lacinia mobilis transformed into a plate, followed by 4 plates decreasing in size, accessory setal row absent; molar absent; left incisor with 6 teeth, lacinia mobilis with 6 teeth, with 3 trapezoid plates decreasing in size; palp 3–articulate, palp setal formula with 1 to 4 large distal setae. <i>Maxilla 1</i> outer plate with 5 stout apical setal-teeth. <i>Maxilliped</i> inner plate subequal to outer plate, subrectangular; outer plate 2/3 (0.66 x) length of inner plate; palp article 2 setose on inner margin; palp article 4 not enlarged, not falcate. Pereon. Pereonites 2 to 7 not fused. <i>Pereonite 1</i> without projections. <i>Gnathopod 1</i> distinctly smaller than gnathopod 2; propodus subtriangular, palm begins about 1/3 along posterior margin, smooth, without large, rounded knob proximally; dactylus curved, inner margin smooth. <i>Pereonite 2</i> without ventral projection between insertion of gnathopods. <i>Gnathopod 2</i> situated toward anterior end of pereonite 2; basis about 0.5 x length of pereonite 2, without anterodistal projection; ischium without anterodistal projection; propodus elliptical, large, anterodistal margin narrowly concave, without anterodistal triangular projection, without projections along mid-anterior margin; palm without proximal cavity filled with membranous sack, proximal projection with 3 robust (grasping) setae, margin convex, minutely serrate, without hook-like projection at base of dactylus, without distal shelf, sinus or midpalmar projection. <i>Pereonite 3</i> without projections. <i>Pereopod 3</i> reduced, with 1 article. <i>Pereonite 4</i> without projections. <i>Pereopod 4</i> reduced, with 1 article. <i>Pereopod 5</i> reduced or vestigial, with 3 slender articles. Pereopods 6 and 7 simple. <i>Pereopod 6</i> basis shorter than propodus. <i>Pereopod 7</i> similar to pereopod 6. <i>Gills</i> on pereonites 2 to 4. <i>Pereonite 3 gill</i> length about 1/4 of corresponding pereonite, straight, ovate. <i>Pereonite 4 gill</i> length about 1/8 of corresponding pereonite, curved anteriorly, ovate. <b>Pleon</b>. Uropods absent. <b>Female</b> (sexually dimorphic characters). <i>Pereonites 4–6</i> shorter than in male; propodus of gnathopod 2 twice as long as wide. Oostegites sparsely setose. Pereopod 6 palm without robust setae. <b>Habitat.</b> Sandy bottoms, coral rubble, 0.5 to 25 m depth. <b>Remarks</b>. The only other known species of <i>Perotripus</i> is <i>P. brevis</i> (La Follette, 1915) from the west coast of North America, redescribed in detail by Laubitz (1970). <i>Perotripus keablei</i> differs from <i>P. brevis</i> as follows: pereonites 2 and 3 are smooth instead of sculptured with lateral projections; pereopod 3 uniarticulate instead of three–articulate; the penes are large instead of small; the pleon lacks a pair of small appendages. <b>Distribution.</b> <i>Australia</i>: Queensland: Blue Lagoon; Casuarina Beach; Mermaid Cove, all Lizard Island (Guerra-García, 2006).
description: Published as part of <i>Guerra-García, José M. &amp; Lowry, J. K., 2009, Caprellidae *, pp. 290-327 in Zootaxa 2260 (1)</i> on pages 315-317, DOI: 10.11646/zootaxa.2260.1.12, http://zenodo.org/record/5320964
description: {"references": ["Lowry, J. K. &amp; Myers, A. A. (2009) Foreword. In: Lowry, J. K. &amp; Myers, A. A. (Eds), Amphipoda of the Great Barrier Reef, Australia. Zootaxa, 2260, 17 - 108.", "La Follette, R. (1915) Caprellidae from Laguna Beach. Journal of Entomology and Zoology, 7, 55 - 63.", "Laubitz, D. R. (1970) Studies on the Caprellidae (Crustacea, Amphipoda) of the American North Pacific. National Museum of Natural Sciences, Ottawa, Publications in Biological Oceanography, 1, 1 - 89."]}