Synonymy: Nannoniscoides Menzies, 1962: 134; Nannoniscus Menzies, 1962: 137; Birstein, 1963: 83–85. Type species: Hebefustis vafer Siebenaller & Hessler, 1977
Diagnosis
Body slightly broadened, length about 3.8 times pereonite 2 width; dorsal cuticle bearing numerous setules. 5 -segmented antennula with slightly bulbous, elongated terminal article; article 3 and 4 of similar length, without lateral projection. Pereopod 1 more robust and shorter than pereopods 2–7; carpus and propodus of pereopod 1 with few (= 4) robust, unequally bifid setae, dactylus with short, robust ventral spine distally. Pereonites 6–7 medially fused. Pleotelson with posterolateral spines. Uropods biramous, short, hardly projecting posterior margin; endopod and exopod nearly of same length (modified after Siebenaller & Hessler 1977).
Remarks. The only specimen of H. hirsutus (Menzies, 1962) is no longer extant, and the sole specimen of H. primitivus (Menzies, 1962) is badly damaged according to Siebenaller & Hessler (1977). Hence, examinations of these two species depended on the illustrations made by Menzies (1962), which do not show all characters/appendices used in the diagnosis. The male paratype of Hebefustis cornutus (USNM 169400) was ordered from the USNM, but could not be found in the received vial. Thus, examinations of this species apply to the drawings made by Siebenaller & Hessler (1977).
Species composition (Table 1). Hebefustis alleni Siebenaller & Hessler, 1977; Hebefustis clareolithis sp. nov.; Hebefustis cornutus Siebenaller & Hessler, 1977; Hebefustis dispar Siebenaller & Hessler, 1977; Hebefustis hexadentium Siebenaller & Hessler, 1977; Hebefustis hirsutus (Menzies, 1962); Hebefustis mollicellus Siebenaller & Hessler, 1977; Hebefustis par Siebenaller & Hessler, 1977; Hebefustis primitivus (Menzies, 1962); Hebefustis robustus (Birstein, 1963); Hebefustis vafer Siebenaller & Hessler, 1977; Hebefustis vitjazi Mezhov, 1986