Locality
|
Tajo (river) |
Teuchitán (river) |
Veracruz |
Aktun-Ha (cenote) |
Aktun-Ha (cenote) |
Durango (river) |
Total body length (mm)
|
4.8 |
5 |
7.8 |
3.85−4.1 |
5.3 |
5.4−5.7 |
Dorsal projections or carinae on pleon 1−2
|
Present (short) |
Absent |
Present |
Present (short) |
Present (short) |
Present |
Head length vs second pereonite
|
Reaching half |
Reaching two thirds |
Reaching half |
Reaching half |
Equal in length |
Reaching half |
Eye form
|
Subquadrate/rounded |
Subquadrate |
Rounded |
Subtriangular |
Absent |
Subtriangular |
Antenna 1 length vs. relative body length
|
Reaching the middle of fifth pereonite |
Reaching the fifth pereonite |
Reaching the middle of third pereonite |
Reaching one-third of third pereonite |
Reaching the middle of third pereonite |
Overreaching the middle of third pereonite |
Antenna 1 peduncle vs. body length
|
Reaching one third of first pereonite |
Reaching half of first pereonite |
Reaching half of first pereonite |
Reaching beyond half of first pereonite |
Reaching half of first pereonite |
Overreaching the middle of first pereonite |
Antenna 1 proportion, articles of peduncle
|
1.6:1.3:1 |
1.5:1.2:1 |
1.6:1.25:1 |
1.4:1.3:1 |
1.7:1.3:1 |
1.5:1.4:1 |
Antenna 1 flagellum, number of articles
|
12 |
10 |
7−9 |
9 |
7 |
9−11 |
Antenna 1 aesthetasc in flagellum on articles
|
4−11 (1 pair) |
4−5 (1), 6−7 (1 pair), 8−9 (1) |
3−6 (1 pair), 7−8 (1) |
− |
− |
4−1 (1 pair), 8−11 (1) |
Antenna 2 length
|
Almost half of total body length |
Almost half of total body length |
Less than one third total body length |
Almost half of total body length |
Almost one third of total body length |
Slightly longer than one third total body length |
Antenna 2 length vs. total body length
|
Almost reaching the seventh pereonite |
Almost reaching the seventh pereonite |
Reaching the fourth pereonite |
Almost reaching middle of sixth pereonite |
Reaching one-third of fourth pereonite |
Reaching middle of fifth pereonite |
Antenna 2 flagellum number of articles
|
15 |
14 |
8−10 |
10 |
8 |
11−12 |
Antenna 2, flagellum relative length vs. peduncle
|
1.5× |
1.8× |
1.1× |
1.2× |
1.35× |
1.25× |
Palp of maxilla 1
|
With setules |
Without setules |
With setules |
With setules |
With setules |
With setules |
Maxilla 1 inner plate, number of setae
|
2−3 |
2 |
3 |
2−3 |
3 |
3−4 |
Maxilliped, palp, 4th article inner margin setae
|
4 |
5 |
4 |
3 |
2 |
3 |
Relative length of nail vs. palp 4th article
|
2/3 |
1/2 |
More than 2/3 |
1/2 |
Almost as long as |
2/3 |
Gnathopod 1, propodus form
|
Hammer |
Hatchet |
Hammer |
Hammer |
Hammer |
Hammer |
Gnathopod 1, propodus maximum length vs. width
|
1.5× |
1.25× |
1.6× |
1.8× |
1.6× |
1.5× |
Gnathopod 1, male propodus, inner face, number of serrate setae in a row
|
3−5 |
4 |
4 |
4 |
− |
3+1 |
Gnathopod 2 basis length vs. width
|
Almost 4× |
More than 3× |
Almost 3× |
3.5× |
− |
More than 3× |
Pereopod 7, lobe length vs. distal margin of ischium
|
Overreaching |
Shorter |
Overreaching |
Overreaching |
Shorter |
Overreaching |
Pereopod 7 relative width of lobe vs. width of basis (measure at cleft)
|
2−2.2× |
2× |
2.5× |
3× |
1.7× |
2× |
Pereopod 7 number of serrations and setae
|
10−11 with setules |
9−11 with setules |
18 with setules but 3 to 5 stout setae |
9 with setules |
11 with setules but 3 stout setae |
14 with setules but 1−2 with stout setae |
Telson
|
W ≥ L |
W ≥ L, or L>W |
W>L |
W>L |
W>L |
L>W |
Telson distal simple setae
|
Two widely separated |
Two widely separated |
Two apposed |
Two widely separated |
Absent |
Two widely separated |