Kingsleya celioi, Pedraza, Manuel & Tavares, Marcos, 2015

Pedraza, Manuel & Tavares, Marcos, 2015, A new species of freshwater crab of the genus Kingsleya Ortmann, 1897 (Crustacea: Brachyura: Pseudothelphusidae) from Amazonia, Brazil, Zootaxa 4032 (4), pp. 444-450 : 445-449

Kingsleya celioi n. sp.

( Figs. 1A–E ; 2A–D; 3A–C)

Type material. Holotype: male cl 16.14 mm, cw 26.16 mm, Brazil, Pará, Parauapebas, Carajás, Andrade et al. coll. 30 August to 16 September 2009 ( MZUSP 25365). Paratypes (same data as holotype unless otherwise stated): 1 male cl 14.43, cw 23.77, 26–31 January 2010 ( MZUSP 25361); 1 female cl 11.52 mm, cw 18.02 mm, 26–31 January 2010 ( MZUSP 32588); 1 young female, cl 6.52 mm, cw 9.47 mm, 26–31 January 2010 ( MZUSP 25363); 1 young female cl 7.50 mm, cb 11.14mm, 26–31 January 2010 ( MZUSP 25364); 1 female cl 13.71 mm, cw 22.44 mm ( MZUSP 25362); 1 female cl 13.43 mm, cw 21.72 mm, 29 August to 0 4 September 2009 ( MZUSP 25367); 1 young male cl 8.97 mm, cw 13.40 mm, 29 August to 0 4 September 2009 ( MZUSP 25366).

Comparative material. Kingsleya castrensis : 1 male paratype, Brazil, Pará, Altamira, Abrigo Pedra do Navio, 31o7'06.4"S, 52o13'42.2''W, R. Pinto da Rocha coll. 20 June 2012 ( MZUSP 25394); 1 male, 1 female paratypes, Pará, Novo Travessão, 16o18'20''S, 52o35' 40''W, Cléber S. de Sousa coll. 13 January 2012 ( MZUSP 32737); 1 male paratype, same locality as holotype, R. Pinto da Rocha coll. 11 April 2012 ( MZUSP 26943); 1 male, Pará, Altamira, Princesa do Xingu road, 31o0'04''S, 52o21' 56''W, Cléber S. de Sousa coll. 19 June 2011 ( MZUSP 32738). Kingsleya gustavoi : 2 males paratypes, Brazil, Pará, Itacaiúnas River, 17 July 1988, C. Magalhães det. ( MZUSP 9699); 1 male, 1 female, Pará, Canaã dos Carajás, Andrade & Amoni coll. 22–28 February 2005, C. Magalhães det. ( MZUSP 16702). Kingsleya hewashimi : 1 male paratype, Venezuela, Amazonas, Bacón River tributary Orinoco, 21o09'57''N, 64o43'36''W, G. Herzog-Schröder coll. April 1996, C. Magalhães & M. Türkay det. ( INPA 1534). Kingsleya junki : male holotype, cl: 21,2mm cw: 33,4mm, Brazil, Pará, Xingu River, Vitória do Xingu, 25o3'S, 52o 01'W, R. Santos, C. Maciel & J.O. Dias coll. 0 3 December 2000, C. Magalhães det. ( MPEG 777); 1 male, cl: 46,1mm cw: 28,7 mm, Brazil, Pará, Altamira, Abrigo do Chuveiro cave, April 2009, C. Magalhães det. ( MZUSP 32818). Kingsleya latifrons : 2 males, Brazil, Roraima, Surumú, C. Magalhães det. ( MZUSP 6390); 1 male, Suriname, Sipalawini, Lawa River, 31o9'31''N, 54o03''W, J. Lundberg et al. coll. 19 April 2007, M. Pedraza leg. ( MZUSP 25928); 1 male, French Guyana, Cayene, M. Mélinon coll., M. Campos det. ( USNM 30028). Kingsleya siolii : 1 male, Brazil, Pará, Akahe creek, Parú do Oeste River, altitude 400 m., E. J. Fittkau coll. June 1960, C. Magalhães det. ( MZUSP 3594); 1 male, ibidem ( INPA 391). Kingsleya ytupora : 1 male, 2 females paratypes, Brazil, Pará, Trombetas River, Porteira Fall, C. Magalhães et. al., coll. 2–10 October 1985, C. Magalhães det. ( MZUSP 7009); 1 male, 1 female paratypes, Pará, Curu-Uma River, R. Huet & A. G. dos Santos coll. October 1983, C. Magalhães det. ( MZUSP 7010); 1 male, 1 female, Pará, Trombetas River, Porteira Fall, 19 April 1985, C. Magalhães leg. ( MZUSP 18459); 1 male, Pará, Trombetas River, O. Bitar coll. 23 April 1985, C. Magalhães det. ( INPA 157).

Diagnosis. Apical plate of G1 large, widest medially in abdominal view, with single large spine-like outgrowth in midlength of mesial margin. Distal margin of apical plate deeply notched ending in 2 large processes subequal in size in abdominal, sternal views. Distal, proximal lobes of apical plate unequal in size, distal lobe largest, tapering distally in lateral view. Semicircular process present on abdominal face of apical plate.

Description of holotype. Carapace distinctly wider than long, dorsal surface smooth, slightly convex, regions barely defined; gastric pits almost obsolete. Cervical groove nearly straight, faint proximally, deep terminally, ending just before antero-lateral margin. Post-frontal lobules low, poorly defined; median groove indistinct between postfrontal lobes; fronto-orbital region width less than half maximum width of carapace. Branchial region markedly expanded laterally, moderately swollen. Antero-lateral margin fringed with small anteriorly-directed tubercles almost evenly spaced. Posterolateral margin, smooth, poorly defined; molting suture well distinct, ending between P4-P5 coxae. Frontal region deflexed downwards; frontal margin carinate, sinuous in frontal view, lined with minute granules. Supraorbital margin lined with small granules. Infraorbital margin slightly crenulated, moderately marginated, slightly sloping mesially. Exorbital angle moderately prominent, obtuse. Inner orbital tooth well developed, broad triangular, lobe-like, partially occluding orbital cavity. Subhepatic region smooth. Pterystogomial regions covered by short pubescence. Mxp3 palp mesial surface markedly setous; dactylus rather flattened ventrally; propodus, carpus subcylindrical. Mxp3 merus subcircular, distinctly shorter than ischium, about 0.65 times its length; posteromesial border expanded mesially, grooved to receive folded dactylus, dentate. Mxp3 ischium subquadrate, distinctly wider than merus; mesial edge setate, dentate, teeth subquadrate, corneous; ischium lateral margin convex. Mxp3 exopod vestigial, reaching to about 0.3 times length of lateral margin of ischium. Opening of efferent branchial channel large; upper margin triangular in outline; channel closed ventrally by large lamellar scaphognathite. Epistome distinctly short, wide, deeply grooved transversally, upper margin straight, strongly carinate; lower margin deeply sinuous to receive folded mxp3 palp, large triangular epistomial tooth in center filling gap between joining palps; scarcely pubescent.

Chelipeds noticeably heterochelous, similarly armed, right cheliped largest. Merus of major cheliped subtriangular in cross-section, upper, mesial margins distinctly crenulated. Carpus upper surface smooth; mesial margin crenulated, ending anteriorly in strong acute tooth. Propodus massive, upper, mesial, lateral surfaces smooth; ventral surface with small tubercles proximally. Movable finger distinctly curved downwards, lateral, mesial, dorsal surfaces with punctations arranged in longitudinal subparallel lines. Cutting edges of fingers with small, massive teeth; fingers noticeable gaping medially and proximally, closing terminally. P2–P5 similar in shape, slender, P3 longest, P5 shortest; meri, carpi, propodi massive, dactili slightly laterally compressed, with 5 longitudinal rows of strong acute spines: 3 dorsal, 2 ventral; propodi with minute scattered spines dorsally and ventrally, punctate laterally, smooth mesially; carpi minutely spinous dorsally, punctate laterally, smooth mesially and ventrally; meri crenulate dorsally, otherwise smooth.

Thoracic sternum rather longer than broad; sternal sutures 4/5 to 7/8 well marked, interrupted medially, ending just before reaching median line of thoracic sternum; median line prolonging from middle portion of sternite 7 to 8, deeper at interception with sternal suture 7/8; episternites 4-6 triangular posteriorly, episternite 7 posteriorly truncate. Sterno-abdominal cavity deeply excavated, scarcely pubescent; tubercle of abdominal holding system minute, placed near sternal suture 5/6.

Male abdomen with 6 somites, telson, triangular in shape, tapering progressively from third somite onward, margins scarcely pubescent, sutures between somites well distinct, complete; third somite widest, sixth longest with ventro-longitudinal ridge antero-laterally, ridge heavily setae. Telson broadly triangular, lateral margins distinctly crenulated. Penis noticeably long, emerging from nearby coxo-sternal condyle articulation, located in shallow depression on sternite 8, proximally thick, abruptly tapering distally.

G1 slightly sinuous, narrow about its midlength, broadened distally. Marginal suture sinuous, displaced toward mesial side. Lateral suture deep, extending 2/3 of gonopod length from proximal potion. Marginal process short, distinctly broad, not overreaching field of apical spines area. Field of apical spines dense, curved longitudinally, delimited laterally by proximal and distal lobes, distally opened by distinct notch at apex of apical plates proximal lobe. Sperm channel opening proximally at field of apical spines. G1 apical plate large, widest medially in abdominal view, bearing two partially superimposed lobes (distal and proximal). G1 with distinct spine-like outgrowth at midlength of mesial margin; distal margin of apical plate cut into two large processes subequal in size, separated from each other by deep notch in abdominal and sternal views, provided with conspicuous semicircular in abdominal view. Distal lobe larger than proximal one; sinuous in lateral view, widest above field of apical spines, distally flattened. Proximal lobe strongly sinuous in lateral view; distal margin almost straight, stretching diagonally over distal lobe, fusing to mesiodistal portion of apical plate. Mesial process large, distinctly prominent, not continuous with apical plate, spine-like distally, slightly oriented to mid-abdominal side; proximal half of mesial margin conspicuously convex in sternal and abdominal views.

G2 straight, almost as long as G1, conspicuously slender, distal 3/4 tapered; tip flattened, with numerous short spinules on sternal surface.

Type locality. Brazil, Pará, Paraupebas, Carajás.

Distribution. Presently known only from the type locality.

Etymology. The species is named in honor of our colleague and friend Célio Magalhães (INPA) in recognition of his outstanding contributions to the taxonomy of Amazonian freshwater decapods.

Remarks. Kingsleya celioi n. sp. is herein assigned to Kingsleya , whose diagnostic characters (cf. Magalhães & Türkay, 2008; Pedraza et al. 2015) are readily recognized in the new species. They are as follow: marginal process distally enlarged, not overreaching the field of apical spines; mesial process distinctly prominent, standing out from the sternal surface of the stem; apical plate with two partially superimposed lobes in lateral view; apical field of spines distally divided by a terminal notch.

Kingsleya celioi n. sp., K. castrensis , and K. junki are unique in the genus in having a large apical plate, widest medially in abdominal view, and the distal lobe of the apical plate widened right above the field of apical spines in lateral view, tapering distally ( Figs. 2A, B, D ; 3A–E), whereas in all other currently known congeners the apical plate is poorly developed, widest proximally in abdominal view, and the width of the distal lobe of the apical plate uniform along its entire length.

Kingsleya celioi n. sp. differs from particular congeners in having: (1) a single large spine-like outgrowth in the midlength of the mesial margin of the apical plate ( Figs. 2A, D ; 3A, B) (dentate outgrowth in K. junki ( Figs. 3 D, E), minute spine-like proximal outgrowth in K. hewashimi , minute lobe-like outgrowth in K. gustavoi , and outgrowth absent in all other species of Kingsleya ); (2) the distal margin of apical plate cut into two large processes subequal in size separated from each other by a deep notch in abdominal and sternal views ( Figs. 2A, D ; 3A, B) (processes markedly unequal in size in the small holotype of K. junki ( Fig. 3 D); processes extremely incipient separated by a very shallow notch in K. castrensis ; processes absent in all other species of Kingsleya . It should be noted, however, that in large males of K. junki such as MZUSP 32818 the distal margin of apical plate is entire, Fig. 3 E); (3) the distal lobe of the apical plate larger than proximal one ( Figs. 2B ; 3B) (distal and proximal lobes nearly equal in size in K. gustavoi , K. hewashimi , K. siolii , and K. ytupora ); (4) the distal lobe of apical plate tapering distally in lateral view ( Figs. 2B ; 3B) (width of distal lobe uniform in lateral view along its entire length in K. besti , K. gustavoi , K. hewashimi , K. latrifrons , K. siolii , and K. ytupora ); and (5) the G1 apical plate provided with a conspicuous semicircular process in abdominal view ( Figs. 2A ; 3A) (semicircular process absent in K. besti and K. hewashimi ).

Figures

FIGURE 1. A – E. Kingsleya celioi n. sp., male holotype, cl 14.43 mm, cw 23.77 mm (MZUSP 25365): A, habitus, dorsal view; B, cephalothorax, ventral view; C, cephalothorax, frontal view; D – E, lateral view of right and left chelipeds, respectively. Scale bars A, C 10 mm; D, B, E 5 mm.

FIGURE 2 A – D, Kingsleya celioi n. sp., male holotype, cl 14.43 mm, cw 23.77 mm (MZUSP 25365): A – D, distal part of left first gonopod in abdominal, lateral, mesial and sternal views, respectively. Scale bar 1 mm.

FIGURE 3 A – C, Kingsleya celioi n. sp., male holotype, cl 14.43 mm, cw 23.77 mm (MZUSP 25365). D, Kingsleya junki holotype, cl 21.2 mm, cw 33.4 mm (MEG 777). E, Kingsleya junki cl 46.1 mm, cw 28.7 mm (MZUSP 32818). Left first gonopod: A, D, E, abdominal view; B, lateral view; C, sternal view. Abbreviations: ap, apical plate; dl, distal lobe of the apical plate; fas, field of apical spines; map, marginal process; mp, mesial process; pl, proximal lobe; smp, semicircular process of the apical plate; spo, spine-like outgrowth of the apical plate. Scale bars 0.5 mm.