Mastigoproctus giganteus (Lucas, 1835)

Barrales-Alcalá, Diego, 2018, Systematic Revision Of The Giant Vinegaroons Of The Mastigoproctus Giganteus Complex (Thelyphonida: Thelyphonidae) Of North America, Bulletin of the American Museum of Natural History 2018 (418), pp. 1-64 : 9

MASTIGOPROCTUS GIGANTEUS COMPLEX

1. Chelicerae and pedipalp coxae, opposing surfaces with stridulatory organ (pars stridens and plectrum, respectively) (figs. 4A–D, F–H, 5A–D, F–H, 6A–D, F–H).....................3

– Chelicerae and pedipalp coxae, opposing surfaces without stridulatory organ (figs. 4E, 5E, 6E)........................ M. scabrosus , stat. nov.

2. Sternite V, medial surface with patch of fine macrosetae (♂) ; pedipalp trochanter, prodorsal margin with spines S3 and S4 subequal or variable in size, unequal, distance between them equal to or less than length of longest spine (figs. 7A, C, E, G, 8C, E); pedipalp femur and tibia, retrolateral surfaces tuberculate or punctate, femur retrolateral margin smooth or punctate, never cristulate (fig. 9A–B, D–E, G–H)......................................4

– Sternite V, medial surface asetose (♂) ; pedipalp trochanter, prodorsal margin with spines S3 and S4 similar in size, both longer than distance between them (fig. 8A); pedipalp tibia and femur, retrolateral surfaces markedly punctate, femur retrolateral margin cristulate (fig. 9F)....................................... ......................................... M. cinteotl , sp. nov.

3. Carapace, epistoma visible in dorsal aspect (fig. 10A, B, E, F); pedipalp tibia, retrolateral surface tuberculate or punctate (fig. 9A, D, E, H...........................................................5

– Carapace, epistoma not visible in dorsal aspect (fig. 10H); pedipalp tibia, retrolateral surface markedly punctate (fig. 9G) .................... ...................................... M. tohono , sp. nov.

4. Pedipalp trochanter, prodorsal margin with five sharp spines (♂); pedipalp femur, retrolateral surface tuberculate or punctate......6

– Pedipalp trochanter, prodorsal margin with five spines, spine S4 short and blunt (♂); pedipalp femur, retrolateral surface punctate (fig. 9D).................... M. floridanus , stat. nov.

5. Pedipalp femur, retrolateral surface with long digitiform tubercles, retrolateral margin not cristulate (♂) (fig. 9E, H).............................7

– Pedipalp femur, retrolateral surface markedly punctate, retrolateral margin cristulate (♂) (fig. 9A)..................................... M. giganteus

6. Pedipalps densely setose; trochanter, prodorsal margin with spine S3 longer than others (♂), distance between S3 and S4 approximately equal to length of S3 (fig. 7E); femur, retrolateral surface with one macroseta at base of each tubercle (fig. 9E); carapace, anterior margin serrate, carinae present between anterior margin and median ocular tubercle (fig. 10B); spermatheca neck wide, seminal receptacles anteriorly directed (fig. 11E, F)........................ M. mexicanus , stat. nov.

– Pedipalps sparsely setose; trochanter, prodorsal margin with spine S3 equal to or longer than S4, both longer than others (♂), distance between them equal to or greater than length of longest spine (fig. 8E); femur, retrolateral surface without macroseta at base of each tubercle (fig. 9H); carapace, anterior margin almost smooth, carinae between anterior margin and median ocular tubercle absent (fig. 10D); spermatheca neck narrow, seminal receptacles posteriorly directed (fig. 12E, F)..................... M. vandevenderi , sp. nov.