CAPRELLIDAE OF WESTERN NORTH ATLANTIC 



57 



Abdomen of male with pair of appendages and pair of setose lobes, 

 female with pair of nonsetose lobes. 



Distribution.— Tj'pe-locality: Antigua, West Indies. 

 New records: Bah;a Fosforescente, Puerto Rico. 



Fallotritella^ new genus 



Flagelluin of antenna 2 biarticulate, swimming setae absent; 

 mandibular palp 3-segmented, setal formula for terminal article 

 1-x-l, molar absent; outer lobe of maxilliped larger than inner lobe; 

 gills on pereonites 3 and 4; pereopods 3 and 4, 1-segmented, pereopod 

 5, 6-segmented; abdomen of male and female with pair of lobes. 



Type-species: Fallotritella biscaynensis , new species (by present 

 designation). 



Remarks. — This new genus is closely related to Tritella Mayer, 

 1890, and Triliropus Mayer, 1903, but differs from these by the lack 

 of a molar on the mandible, having the inner lobe of the maxilliped 

 rounded instead of flattened, and by the lack of setae on the dactylus 

 of the maxilHpedal palp. Table 2 summarizes the differences between 

 these genera. 



Table 2.- — Taxonomic characters separating Fallotritella, Tritella, and Triliropus 



SwimmiDg setae on 



antenna 2 

 Inner lobe of maxilliped 

 Dactylus of maxilliped 



with setae 

 Grasping spines on pro- 



podus of pereopods 5-7 



Insertion of pereopod 5 



Fallotritella 

 biscaynensis 



Tritella iaevis, Tritella tenuui- Triliropus 



pilimana, ornuta siwa tincinatits 



absent 



present 



absent 



absent 



Tritella tenuissima Dougherty and Steinberg, 1953, differs from the 

 other species of Tritella in that swimming setae are lacking on antenna 

 2 and pereopod 5 is inserted near midlength on pereonite 5. These 

 characters are found in Triliropus, and Tritella tenuissima should 

 probably be transferred to this genus; however, since I have not 

 examined specimens of Triliropus I will refrain from making the 

 transfer at this time. 



The generic name is derived from the Latin term "fallo," meaning 

 false, in combination with Tritella, the name of a closely alhed genus. 



