Crangonidae

Vázquez-Bader, Ana Rosa & Gracia, Adolfo, 2013, Crangonidae and Glyphocrangonidae (Decapoda; Caridea) of the Southern Gulf of Mexico, Zootaxa 3669 (3), pp. 367-383 : 380

Key to the Gulf of Mexico species of Crangonidae

1. Second pereiopod chelate............................................................................... 2

- Second pereiopod simple............................................................................... 7

2. Six or 7 gills in each gill chamber, each with ventral apex directed posteriorly...................................... 3

- Eight gills in each gill chamber, each with ventral apex directed anteriorly........................................ 6

3. Rostrum without lateral teeth in posterior half; carapace without longitudinal suture extending from orbital margin to branchial region; with single spine behind rostrum; merus of 1 st pereiopod with strong spine on flexor margin....... Philocheras gorei

- Rostrum armed with 1 or 2 pairs of lateral teeth in posterior half................................................ 4

4. Carapace with one middorsal tooth posterior to the level of midlength, 2 teeth on the lateral face....... Parapontophilus ... 5

- Carapace with two middorsal tooth, more than 3 or 4 teeth on lateral face (including a hepatic tooth and 2 or 3 epibranchial), small spine above orbital cleft......................................................... Pontophilus brevirostris

5. 1 rudimentary anterior epigastric tooth on the carapace; cornea well pigmented and faceted........ Parapontophilus gracilis

- 1 anterior epigastric tooth; cornea opaque and no faceted................................. Parapontophilus talismani

6. Rostrum simple, not cleft apically, with 2 pairs of lateral teeth; carapace with 4 or 5 teeth on 1st lateral carina; abdominal sterna unarmed......................................................................... Parapontocaris ... 7

- Rostrum short, spiniform or with distinct lateral teeth (1 to three pairs)............................................ 8

7. Dorsal midline of carapace with four distinct spines...................................... Parapontocaris caribbaea

- Dorsal midline of carapace with five distinct spines.......................................... Parapontocaris vicina

8. Second pereiopod reduced in size failing to reach end of merus of first pereopods................................... 9

- Second pereiopod strong, overreaching merus of preceding pair; eye without cornea; interlocking mechanism between telson and uropods; telson truncated armed with 2 pairs of long spines............................. Prionocrangon pectinata

9. Carapace with three pairs of strongly denticulate carinae; orbit with cleft; abdomen with median or submedian carinae on the1st to 6 th somites........................................................................ Sabinea hyxtrix

- Carapace without denticulate lateral carinae on the carapace, three teeth on dorsal midline; orbit smooth; abdomen dorsally rounded........................................................................... Lissosabinea tridentata