MARINE GAMMARIDEA]Sr AMPHIPODA 167 



Genera of Beaudettiidae 



Beaudettia J. L. Barnard 



Beaudettia J. L. Barnard, 1965. 



Type-species : B. palmeri J. L. Barnard, 1965 (original designation) . 

 Species: 1, Micronesia, littoral. 



Calliopiidae 



Figures 71-73, 146 i-k 



Diagnosis. — Accessory flagellum absent or composed of a tiny 

 article or scale; telson entire, apically emarginate or apically notched, 

 never deeply split. See Eusiridae, Pleustidae, Isaeidae, Laphystiopsi- 

 dae, Oedicerotidae, Amphilochidae, Ampithoidae, Paramphithoidae. 



Description. — Accessory flageUum vestigial or absent; rostrum 

 usually inconspicuous; upper lip usually poorly incised or not; 

 mouthparts basic, but mandibular molar occasionally nontriturative ; 

 lower lip with or without inner lobes, never taking the form of Pleu- 

 stidae (see p. 421); coxae of medium length or short; occasionally 

 coxa 4 not posteriorly excavate; gnathopods powerful or feeble, 

 usually subchelate, occasionally simple; uropod 3 with elongate 

 lanceolate rami, outer occasionally shorter than inner; telson of 

 medium length, entire, acuminate, emarginate, or notched. 



Relationship. — Eusiridae are close to this family but have a 

 distinctly cleft telson; when only notched apically the telson is elongate 

 in eusirids. Interfamilial gradation is seen by comparing telsons of 

 Chosroes, Atylopsis, and Halirages in Calliopiidae and Pontogeneoides 

 in Eusiridae. 



That the Calliopiidae are simply Eusiridae-Pontogeneiidae with 

 fused telsonic lobes is well demonstrated in the fact that some callio- 

 piid genera are paired with some eusirid genera. Djerboa (Eusiridae) 

 and Metaleptamphopus (Calliopiidae) share pectinate dactyls of pere- 

 pods; Sancho (Calliopiidae) has eusirid gnathopods; Harpinioides 

 (Calliopiidae) smd Harpinioidella (Eusiridae) have similar gnathopods ; 

 Stenopleura (Calliopiidae) and Meteusiroides (Eusiridae) are very 

 similar in all characters except telsons. 



Calliopiids no longer differ from other families by their incon- 

 spicuous rostra because several have been discovered lately that have 

 a longer rostrum than do some eusirids and pleustids. 



Pleustidae differ from Calliopiidae only by the special configuration 

 of their lower lips. The genera Mesopleustes (Pleustidae) and Harpini- 

 oides (Calliopiidae) have lower lips which are very difficult to classify 



