Download PDF as one large file - AToL Decapoda

500 Family Majidae
Genus Macroedetdinh Miers, 1879
Key to species
[Adapted from Rathbuh, 1925]
h Carapace with fewer than 7 spines on its posterior half" or, if with 7 spines, some of
them small .....................2
Carapace with 7 strong spines on its posterior half.............................;•.-.:..... 8
2, (1) Basal antenna! segment armed with only one spine or sharp tubercle...........;..... 3
Basal ahtennal segment armed with 2 or more spines; orbits elongate-tubular.>....-.. 7
3. (2) Rostral horns separated by interspace; interspace narrow or pointed at base 4
Rostral horns separated by interspace; interspace broad and refunded at base*........ 6
4; (3) Posterolateral projections narrow, spirielike........ M. irispihosufn trispinbsiim
Posterolateral projections broad, bladelike 5
5. (4) Posterolateral projections very broad, their margins continuous with marginal lines
of carapace M. trispin osuni nodipes
Posterolateral projections less broad, their margins making angle with marginal
lines of carapace M.trispin osum variety
6. (3) Carapace deeply sculptured or areolated between two posterolateral spines; rostral
seines short and stotit (posterolateral spines directed obliquely backward)
stv».•.-; M. subparallelum
Carapace not unusually sculptured between epibrahchial spines; rostral horns longer
arid slenderer M. diplacanihum
1. i$) Rostral spines separated by U-shaped sinus... v.... M. eiitheeti
Rostral spines separated by V-shaped sinus; basal ahtehhal segment armed with 2
spines forming oblique line, outer spine more or less distant from orbital margin ....
M. laevigatum
8. (1) Basal ahtennal segment armed with only one spine............... M. camptocerum
Basal aritennal segment armed with two spines in transverse line
......— M. septemspindsum