Sahyadriana, PATI & THACKERAY, 2018

Pati, Sameer K. & Thackeray, Tejas, 2021, Five new species of freshwater crabs of the genera Ghatiana Pati & Sharma, 2014 and Sahyadriana Pati & Thackeray, 2018 from India (Decapoda: Brachyura: Gecarcinucidae), Zoosystema 43 (26), pp. 627-647 : 645-646

KEY TO SPECIES OF SAHYADRIANA PATI & THACKERAY, 2018 (modified from Pati & Thackeray 2018)

1. Chelipeds with broadly rounded or spoon-shaped fingertips; branchial regions relatively less inflated ......... 2

— Chelipeds with pointed fingertips; branchial regions relatively more inflated ............................................... 3

2. G1 terminal segment relatively slenderer, inverted funnel-shaped, long, c. 0.5 times length of subterminal segment, distal half abruptly narrow; vulva in adult relatively larger, occupying c. 0.5 times length of S6, positioned some distance from S5/S6 ............................ S. pilosipes (Alcock, 1909) [MAHARASHTRA: Satara district].

— G1 terminal segment relatively stouter, cone-shaped, short, c. 0.3 times length of subterminal segment, distal portion gradually narrow; vulva in adult relatively smaller, occupying c. 0.4 times length of S6, positioned close to S5/S6 ........... S. thackerayi (Pati in Pati, Thackeray & Khaire, 2016) [MAHARASHTRA: Ratnagiri district].

3. Epistome posterior margin with gently concave lateral lobes ....................................................................... 4

— Epistome posterior margin with strongly concave lateral lobes ..................................................................... 7

4. Epibranchial tooth indistinct; G1 terminal segment relatively longer, c. 0.6–0.7 times length of subterminal segment; G1 subterminal segment relatively slenderer ................................................................................. 5

— Epibranchial tooth visible as relative distinct notch; G1 terminal segment relatively shorter, c. 0.4 times length of subterminal segment; G1 subterminal segment relatively stouter ............................................................. 6

5. Male pleon relatively broader, with subquadrate pleonal somite 6, i.e., broader than long; G1 relatively stouter, with relatively stouter terminal segment; vulvae in adult positioned apart from each other (VD/SW = c. 0.3) close to S5/S6 ..................... S. pachyphallus Pati & Thackeray, 2018 [MAHARASHTRA: Kolhapur district].

— Male pleon relatively narrower, with quadrate pleonal somite 6, i.e., as long as broad; G1 relatively slenderer, with relatively slenderer terminal segment; vulvae in adult relatively closely positioned (VD/SW = c. 0.2) some distance from S5/S6 ............ S. tenuiphallus Pati & Thackeray, 2018 [MAHARASHTRA: Ratnagiri district].

6. G1 terminal segment relatively stouter; G1 subterminal segment with relatively broader distal portion; vulva in adult relatively larger, occupying c. 0.5 times length of S6, positioned close to S5/S6 ..................................... .................................................................................... S. keshari n. sp. [MAHARASHTRA: Nashik district].

— G1 terminal segment relatively slenderer; G1 subterminal segment with relatively narrower distal portion; vulva in adult relatively smaller, occupying c. 0.4 times length of S6, positioned some distance from S5/S6 ............ ..... S. waghi (Pati in Pati, Thackeray & Khaire, 2016) [MAHARASHTRA: Ahmednagar and Pune districts].

7. G1 terminal segment relatively slenderer, subcylindrical .............................................................................. 8

— G1 terminal segment relatively stouter, cone-shaped or inverted funnel-shaped ......................................... 10

8. Epibranchial tooth indistinct; G1 relatively stouter, with distally distinctly curved outwards terminal segment and basally broad subterminal segment .......................................................................................................... ...................................................... S. triangulus ( Pati & Sharma, 2014) [MAHARASHTRA: Satara district].

— Epibranchial tooth visible as relative distinct notch; G1 relatively slenderer, with distally gently curved inwards terminal segment and basally narrow subterminal segment .......................................................................... 9

9. G1 terminal segment gradually narrow distally, relatively shorter, c. 0.4 times the length of the subterminal segment; G1 subterminal segment with almost straight inner margin; vulvae in adult positioned apart from each other (VD/SW = c. 0.4), relatively smaller, occupying c. 0.4 times length of S6 .............................................. ............................... S. alcocki (Pati in Pati, Thackeray & Khaire, 2016) [MAHARASHTRA: Satara district].

— G1 terminal segment distinctly narrow distally, relatively longer, c. 0.5 times the length of the subterminal segment; G1 subterminal segment with sinuous inner margin; vulvae in adult relatively closely positioned (VD/ SW = c. 0.3), relatively larger, occupying c. 0.5 times length of S6 .................................................................. ..................................................................................... S. tamhini n. sp. [MAHARASHTRA: Pune district].

10. G1 terminal segment cone-shaped, with distal portion gradually narrow; G1 subterminal segment relatively stouter ...................................... S. woodmasoni Pati & Thackeray, 2018 [MAHARASHTRA: Satara district].

— G1 terminal segment inverted funnel-shaped, with distal portion abruptly narrow; G1 subterminal segment relatively slenderer ..................................................................................................................................... 11

11. Epibranchial tooth visible as relative distinct notch; G1 terminal segment relatively slenderer, relatively longer, c. 0.5 times length of subterminal segment; vulva in adult subovate in shape, relatively smaller, occupying c. 0.4 times length of S6, positioned some distance from S5/S6 ............................................................................... ................................................................................. S. inopinata n. sp. [MAHARASHTRA: Satara district].

— Epibranchial tooth indistinct; G1 terminal segment relatively stouter, relatively shorter, c. 0.3-0.4 times length of subterminal segment; vulva in adult suborbicular in shape, relatively larger, occupying c. 0.5 times length of S6, positioned close to S5/S6 .................................................................................................................... 12

12. Male pleonal somite 5 and 6 with concave and sinuous lateral margins, respectively; G1 terminal segment relatively shorter, c. 0.3 times length of subterminal segment; vulvae in adult positioned apart from each other (VD/SW = c. 0.4) ........................................................................................................................................... ................... S. billyarjani Pati & Thackeray, 2018 [MAHARASHTRA: Kolhapur and Sindhudurg districts].

— Male pleonal somites 5 and 6 with almost straight lateral margins; G1 terminal segment relatively longer, c. 0.4 times length of subterminal segment; vulvae in adult positioned relatively close to each other (VD/SW = c. 0.3) ............ ................. S. sahyadriensis Pati & Thackeray, 2018 [MAHARASHTRA: Kolhapur, Ratnagiri and Satara districts].