Table 2 Comparative table of morphological characters of Ampelisca troncosoi sp. nov. and closely related species
Head | Corneal lenses | Rostrum | Antennae | Pereopod 7 merus | Pereopod 7 basis | Epimeral plate 3 | Urosome carina | Uropod 3 | Telson | |
|---|---|---|---|---|---|---|---|---|---|---|
A. troncosoi sp. nov. | LA present | 1 pair | Distally rounded; between A1 pair | A1 > PA2 | Lobe absent | PL normal | PDA rounded | Rounded, prominent | Two rows of minute spines and long setae on outer ramus; long setae on inner ramus | Few dorsal spine-like setae; several long setae on cleft margins; 2 plumose distal setae |
A. uncinata Chevreux, (1887) | LA absent | 0–1 pair | Absent | A1 < PA2 | Large posterior lobe | PL normal | PDA with tooth | Angular | Several long and short marginal setae and long terminal setae on rami | Several dorsal long setae |
A. brachyceras Walker, (1904) | LA present | 1 pair | Distally acute; above A1 pair | A1 = PA2 | Lobe absent | PL normal | PDA with tooth | Small | Two rows of minute spines and long setae on outer ramus; long setae on inner ramus | Several long setae on cleft margins |
A. ctenopus Schellenberg, (1925) | LA absent | 1–2 pairs | Absent | A1 = PA2 | Lobe absent | PL normal | PDA with tooth | Small, quadrate | Several long marginal setae on rami | 8–12 long dorsal setae; 2 distal long setae |
A. heterodactyla Schellenberg, (1925) | LA present | 0 | Present | A1 ≤ PA2 | Lobe absent | PL margin distally excavate | PDA rounded | Flat | One row of minute spines and long setae on outer ramus; long setae on inner ramus | 6 setae on cleft margins |
A. heterodactyla sensu Reid, (1951) | LA present | 2 pairs | Distally acute; above A1 pair | A1 < PA2 | Lobe absent | PL normal | PDA rounded | Flat | Terminal? long setae on rami | Several long setae (on cleft margins?) |
A. monoculata Dauvin and Bellan-Santini, (1985) | LA absent | 1 pair | Absent | A1 < PA2 | Lobe absent | PL normal | PDA with tooth | Small, quadrate | Several marginal setae on rami | 2 subterminal spines on cleft right lobe; 1 spine on left lobe |