Ogyrides wickstenae Ayón-Parente & Salgado-Barragán, 2013, sp. nov.
Creators: name: Ayón-Parente, Manuel
name: Salgado-Barragán, José
Publisher: name: Zenodo
Year: 2013
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Decapoda
Ogyrididae
Ogyrides
Ogyrides wickstenae

description: Ogyrides wickstenae sp. nov.
Figs. 1–3
Material examined. Holotype: 1 male (CL= 5.4 mm), Mazatlán, Sinaloa, Mexico, Isla de la Piedra, 23°11’10”N, 106°24’40”W, sand, intertidal, 5 November 2012, coll. JSB and MAP (EMU-9789); paratype: 1 female (CL= 4.7 mm), Playa “Roca del Mar”, 23°14’31”N, 106°27’13”W, sand, intertidal, 8 February 2012, coll. Daniela Ríos and JSB (EMU-9790).
Description. Carapace (Fig. 1 A, B) about 0.5 times as long as abdomen. Rostrum triangular, acute, setose at tip; as long as extracorneal teeth. Extracorneal teeth rounded. Infracorneal teeth shorter than extracorneal, spiniform, pterygostomial angle moderately projected, rounded. Postrostral midline with single, movable spine.
Eyestalks (Fig. 1 A, B) exceeding antennular peduncles by about 1.5 times corneal length, thickened at base, narrowest around mid-length; cornea small, well-pigmented, slightly dilated.
First and second antennular article (Fig. 1 B) about equal in length if measured from antennular base; second article twice as long as broad; third article 0.5 times length of second. Stylocerite (Fig. 1 A, B), ending in two strong, acuminate spines, superior spine almost reaching to distal margin of first article of antennular peduncle, inferior spine surpassing distal margin.
Antennal scale (Fig. 1 C) rounded mesially, about 3.3 times longer than greatest width near base, exceeding second article of antennular peduncle. Carpocerite almost as long as antennular peduncle. Distoventral margin of basicerite bearing two small acute spines.
Third maxilliped (Fig. 1 D) exceeding the distal article of antennules. First endopodal article with one small dorsolateral spine; mesial face of second article (Fig. 1 E) with spaced short rows of brush-like setae; ratio of endopodal article lengths from proximal to distal: 1: 0.6: 0.25.
First pereopods (Fig. 2 A) symmetrical, reaching 0.66 of penultimate antennular article. Ischium 0.6 times as long as merus, bearing rounded protrusion on proximoventral margin provided with a robust seta. Merus 4.5 times as long as broad. Carpus 4.5 times as long as distal width, distal width 1.4 times of proximal width. Chela about as wide as carpus, with fingers about 1.5 times palm length.
Second pereopod (Fig. 2 B, C) with ischium 0.8 times merus length, bearing shallow notch on ventral margin proximally. Merus 0.8 times carpus length. Carpus five-segmented, length ratio of carpal articles from proximal to distal: 1: 0.3: 0.4: 0.2: 0.4.
Third pereopod (Fig. 2 D) with ischium and merus each bearing one subterminal spine on ventral margin. Merus 1.2 times carpus length. Propodus moderately stout, 0.7 times carpus length, with setose margin. Dactylus spatulate, slightly longer than propodus.
Fourth pereopod (Fig. 2 E, F) longer than third, with all segments furnished with long setae. Ischium about half as long as merus. Merus five times as long as broad. Carpus 0.6 times merus length. Propodus shorter than carpus, tapered distally. Dactylus curved, subspatulate, about half propodus length.
Fifth pereopod (Fig. 2 G) longest, slenderer than preceding pereopods, unevenly setose. Ischium longer than merus. Merus eight times as long as broad. Carpus shorter than propodus, broadened distally. Propodus slightly shorter than dactylus, both with long setae. Dactylus subspatulate.
Thelycum-like structure of male (Fig. 1 F) narrow and elongate, lying between bases of coxae of fourth pereopods, ventral to sternal plates, anteriorly reaching bases of third pereopods; anterior margin bearing V-shaped cleft; lateral margins nearly straight, posterior area partly fused to coxae of pereopods and sternum. Coxae of fifth pereopods with small lobes.
Male first pleopod (Fig. 3 A) with endopod shorter than exopod, compressed subdistally, ending in appendix interna distally bearing 16 minute coupling, hook-shaped uncinuli. Male second pleopod (Fig. 3 B) with endopod about as long as exopod, tapering at apex; appendix masculina short, with long setae; appendix interna subcylindrical, longer than appendix masculina, distal field with about 14 short mushroom-shaped uncinuli.
Female first pleopod (Fig. 3 C) with endopod shorter and more slender than exopod, with long setae. Female second pleopod (Fig. 3 D) with endopod bearing appendix interna, latter long, about 0.7 length of endopod, distally with eight short mushroom-shaped uncinuli.
Telson (Fig. 1 G) subtriangular, about twice as long as maximum width, with slight lateral prominences; dorsal surface with low ridges and two pairs of spines situated at same distance from lateral margins anterior and posterior to telson mid-length, respectively; posterior margin bluntly projecting medially, with two pairs of posterolateral spines inserted posterior to distal pair of dorsal spines, mesial spines longer than lateral. Endopod and exopod of uropods long, slender, exceeding posterior margin of telson.
Etymology. The new species is named to honor Dr. Mary K. Wicksten in recognition of her important contribution to the study of carideans from eastern tropical Pacific.
Distribution. Known only from type locality, Mazatlán, Mexico.
Remarks. Ogyrides wickstenae sp. nov. resembles O. tarazonai from the Pacific coasts of Nicaragua and Peru and O. hayi from the western Atlantic by the presence of a single postrostral spine on the carapace. However, the new species can be distinguished from both the latter species by the number of articles in the carpus of the second pereopod: five in O. wickstenae sp. nov. instead of four in O. tarazonai and O. hayi; and the presence of a small distal spine on the first endopodal article of the third maxilliped, which is not mentioned in the description of the other two species. The new species is also distinguishable from O. tarazonai by the third pereopod being armed with one distal spine on ischium and merus instead one spine solely in merus in O. tarazonai. The telson in O. wickstenae sp. nov. is proportionally longer than in O. tarazonai, with the posterolateral spines situated posterior to the distal spines, whereas in O. tarazonai, these spines are inserted at the same level as the posterior spines (Wicksten & Méndez 1988: fig. 1b). Ogyrides wickstenae sp. nov. can be additionally differentiated from O. hayi by the longer spines of the antennular stylocerite, which in the new species are reaching the distal margin of the first antennular article vs. about 0.7 in O. hayi (Williams 1984: fig. 75b). The second antennular article is about twice as long as the third article in the new species, whereas in O. hayi, it is about three times longer. The telson in O. wickstenae sp. nov. has two pairs of posterolateral and two pairs of dorsal spines, whilst the telson of O. hayi is armed with only one pair of dorsal spines, without lateral spines.
According to Williams (1981), O. alphaerostris can be found in estuaries or near-shore waters on a variety of bottoms and from the intertidal to 52 m. In Mazatlán, O. alphaerostris and O. wickstenae sp. nov. seem to prefer different depths. According to Hendrickx & Wicksten (1987), O. alphaerostris is widely distributed in the bay of Mazatlán, where it was collected by grab samples at depths ranging from 5 to 18 m, whilst the new species was collected intertidally on two sandy beaches.
description: Published as part of Ayón-Parente, Manuel & Salgado-Barragán, José, 2013, A new species of the caridean shrimp genus Ogyrides Stebbing, 1914 (Decapoda: Ogyrididae) from the eastern tropical Pacific, pp. 589-594 in Zootaxa 3683 (5) on pages 590-594, DOI: 10.11646/zootaxa.3683.5.7, http://zenodo.org/record/219899