Megachactops coriaceo ( González-Sponga, 1991 ) Ochoa & Rojas-Runjaic & Pinto-da-Rocha & Prendini, 2013

Ochoa, José A., Rojas-Runjaic, Fernando J. M., Pinto-da-Rocha, Ricardo & Prendini, Lorenzo, 2013, Systematic Revision Of The Neotropical Scorpion Genus Chactopsis Kraepelin, 1912 (Chactoidea: Chactidae), With Descriptions Of Two New Genera And Four New Species, Bulletin of the American Museum of Natural History 2013 (378), pp. 1-121 : 111-112

Megachactops coriaceo ( González-Sponga, 1991) , n. comb.

Figures 2 , 64A, B , 65A, B , 66 , 67A , 68A , 69A, B , 70 , 71 , 72

Chactopsis coriaceo González-Sponga, 1991: 13 , 26–32, 58, 59, figs. 21–27, map 1; 1996: 111, 115, figs. 256–259; 2001: 29, 41, 49, map 5; Lourenço, 2002b: 435.

Chactopsis coriacea: Sissom, 2000: 311 ; Soleglad and Sissom, 2001: 92; Rojas-Runjaic and de Sousa, 2007: 299; Botero-Trujillo, 2008: 34.

TYPE MATERIAL: VENEZUELA: Amazonas: Municipio Rio Negro: Holotype ³ [not ♀] ( MAGS 4691 ), 2 ³ paratypes ( MAGS 4613 , 4614 ), paratype ♀ ( MAGS 4706 ), 1 subad. ³ paratype ( MAGS 4708 ), Rio Mawarinuma [Baria River], base of tepui La Neblina , 00 ° 559N 66 ° 109W, ca. 140 m, 1.xii.1984, C. Brewer; paratype ³ ( USNM), same data except ‘‘ 3.vii.1984, A. Paolillo, C. Brewer and P. Anduze’ ’; paratype ♀ ( USNM), same data except ‘‘ 1.xii.1984, A. Paolillo, C. Brewer and P. Anduze. ’’

DIAGNOSIS: Megachactops coriaceo , n. comb., may be distiguished from M. kuemoi , n. sp., as follows. Megachactops coriaceo , n. comb., is in general more granular, with more pronounced carination. The carapace is entirely finely and densely granular, the pedipalp patella intercarinal surfaces are mostly finely granular, the ventral intercarinal surfaces of metasomal segments I–V densely granular, and the lateral and ventral surfaces of the telson (³) finely granular in M. coriaceo , n. comb. (figs. 64A, B, 66, 68A, 69A, B), whereas the carapace is coarsely granular (more so in ³) with some smooth, punctate surfaces, the pedipalp patella intercarinal surfaces mostly smooth and punctate, and the ventral intercarinal surfaces of metasomal segments I–V and lateral and ventral surfaces of the telson (³) are mostly smooth and punctate in M. kuemoi , n. sp. (figs. 64C, D, 67B, C, 68B, 69C, D). The pedipalp chela carinae are finely and densely granular in M. coriaceo , n. comb., but more coarsely and sparsely granular in M. kuemoi , n. sp. The pedipalp patella EM carina is obsolete, obscured by dense granulation in M. coriaceo , n. comb., but complete and granular in M. kuemoi , n. sp. The DSM carinae, present on metasomal segments I–III in M. coriaceo , n. comb., are absent in M. kuemoi , n. sp. The ventral intercarinal surfaces of metasomal segments I–V are densely granular in M. coriaceo , n. comb., but smooth in M. kuemoi , n. sp. The DL and ML carinae of metasomal segments I–IV, pronounced in M. coriaceo , n. comb., are obsolete in M. kuemoi , n. sp. The VM carinae are present in the anterior half of metasomal segments III and IV, and the VSM carinae in the anterior third of segment V in M. coriaceo , n. comb., whereas the VM carinae are absent on segments I–IV, and the VSM carinae are absent in the anterior third of segment V in M. kuemoi , n. sp. Other differences between the two species are as follows: the pectines and coxosternal region are densely covered with microsetae in M. coriaceo , n. comb., but sparsely covered (especially in ♀) in M. kuemoi , n. sp.; pedipalp chela trichobothrium eb is situated subproximal to the base of the fixed finger in M. coriaceo , n. comb., and proximal in M. kuemoi , n. sp.

SUPPLEMENTARY DESCRIPTION: The following supplements González-Sponga’s (1991) original description.

Trichobothria: Femur with three trichobothria (fig. 70A). Patella with 33 trichobothria (fig. 70B–D): two dorsal, seven ventral, 23 external, one internal; v 1 –v 7 aligned and situated close to VE carina; est 5 situated on external surface near VE carina, distal to est 4; est 3 situated slightly proximal to est 4; em trichobothria situated approximately in same axis, em 1 slightly distal to em 2 and em 3; esb 2 situated distal to esb 3. Chela with 26 trichobothria (fig. 71): 10 situated on manus, three ventral, seven external; 16 situated on fixed finger, seven external, six dorsal, three internal; isb absent; it situated between et 3 and est; Est situated equidistant between V 3 and Et 1; V 3 situated closer to V 1 than to V 4; Et 2 situated in same axis as Et 1; Esb situated proximal to Eb 2; eb situated near base of fixed finger; db situated slightly distal to esb; dm 1 situated slightly proximal to et 3.

Hemispermatophore: Apex short, curved to ventral surface, and tapering distally (fig. 72A–C); flagellum short, slightly curved; ental margin slightly undulate distally; ental fold short, subtriangular, situated at base of apex; pedicel elongated. Trunk well developed, strongly tortuous medially, sheathshaped part approximately one-third the length of trunk; ventral concavity well developed; foot approximately half the length of trunk. Lobe region well developed, with two lobes; ental lobe elongated, terminating in strongly sclerotized apophysis; median lobe auriculate, extending entally and ventrally, approximately 80 % the length of lamina, distal margin slightly folded, dorsal margin well sclerotized, with small spines medially, dorsal surface finely papillose, ental surface strongly sclerotized, apapillose; median trough deep, extending entire length of median lobe.

REMARKS: The sex of the holotype (³) was misidentified in the original description as ♀.

DISTRIBUTION: Megachactops coriaceo , n. comb., is known only from the type locality in the state of Amazonas, Venezuela, near the border with Brazil (fig. 2).

HABITAT: The type locality of this species falls within primary rainforest at the base of tepui La Neblina.

Figures

Fig. 2. Distribution of Chactopsoides, n. gen., and Megachactops, n. gen., plotting known locality records in Brazil, Colombia, and Venezuela. Chactopsoides anduzei (González-Sponga, 1982), n. comb., solid squares; Chactopsoides gonzalezspongai, n. sp., solid diamond; Chactopsoides marahuacaensis (González-Sponga, 2004), n. comb., open square; Chactopsoides yanomami (Lourenço et al., 2011), n. comb., solid circle; Megachactops coriaceo (González-Sponga, 1991), n. comb., open diamond; Megachactops kuemoi, n. sp., open circle; undetermined Chactopsoides species, solid stars.

Fig. 64. Megachactops, n. gen., carapace, dorsal aspect. A, B. Megachactops coriaceo (González- Sponga, 1991), n. comb. A. Holotype ³ (MAGS). B. Paratype ♀ (MAGS). C, D. Megachactops kuemoi, n. sp. C. Holotype ³ (MHNLS). D. Paratype ♀ (AMNH). Scale bars 5 1 mm.

Fig. 65. Megachactops, n. gen., sternum and pectines, ventral aspect. A, B. Megachactops coriaceo (González-Sponga, 1991), n. comb. A. Holotype ³ (MAGS). B. Paratype ♀ (MAGS). C, D. Megachactops kuemoi, n. sp. C. Holotype ³ (MHNLS). D. Paratype ♀ (AMNH). Scale bars 5 1 mm.

Fig. 66. Megachactops coriaceo (González-Sponga, 1991), n. comb., holotype ³ (MAGS), metasomal segments I–IV. A. Dorsal aspect. B. Lateral aspect. C. Ventral aspect. Scale bar 5 1 mm.

Fig. 67. Megachactops, n. gen., metasomal segments III–V (A, B) or IV and V (C), lateral aspect. A. Megachactops coriaceo (González-Sponga, 1991), n. comb., paratype ♀ (MAGS). B, C. Megachactops kuemoi, n. sp. B. Holotype ³ (MHNLS). C. Paratype ♀ (AMNH). Scale bars 5 1 mm.

Fig. 68. Megachactops, n. gen., metasomal segments III–V, ventral aspect. A. Megachactops coriaceo (González-Sponga, 1991), n. comb., paratype ♀ (MAGS). B. Megachactops kuemoi, n. sp., holotype ³ (MHNLS). Scale bars 5 1 mm.

Fig. 69. Megachactops, n. gen., telson, lateral aspect. A, B. Megachactops coriaceo (González-Sponga, 1991), n. comb. A. Holotype ³ (MAGS). B. Paratype ♀ (MAGS). C, D. Megachactops kuemoi, n. sp. C. Holotype ³ (MHNLS). D. Paratype ♀ (AMNH). Scale bars 5 1 mm.

Fig. 70. Megachactops coriaceo (González-Sponga, 1991), n. comb., holotype ³ (MAGS), dextral pedipalp segments. A. Femur. B–D. Patella. A, B. Dorsal aspect. C. External aspect. D. Ventral aspect. Scale bar 5 1 mm.

Fig. 71. Megachactops coriaceo (González-Sponga, 1991), n. comb., dextral pedipalp chela. A. Holotype ³ (MAGS). B–E. Paratype ♀ (MAGS). A, C. External aspect. B. Dorsal aspect. D. Ventral aspect. E. Internal aspect. Scale bars 5 1 mm.

Fig. 72. Megachactops coriaceo (González-Sponga, 1991), n. comb., holotype ³ (MAGS), sinistral hemispermatophore. A. Ental aspect. B. Dorsal aspect. C. Ectal aspect. Annotations: ef, ental fold; el, ental lobe; fl, flagellum; med, median lobe; Ped, pedicel; ssp, sheath-shaped portion; vc, ventral concavity. Scale bar 5 1 mm.