Sanchoidae

Lowry, J. K., 2006, New families and subfamilies of amphipod crustaceans, Zootaxa 1254, pp. 1-28 : 21-24

Sanchoidae fam. nov.

( Fig. 6 )

Type genus

Sancho Stebbing, 1897.

Description

Head. Exposed; longer than deep; anteroventral margin rounded, anteroventral margin not recessed, anteroventral margin not excavate; rostrum short or moderate length; eyes well developed, round or ovoid. Body dorsoventrally flattened; body without setae; smooth. Antenna 1 subequal in length to antenna 2 or longer than antenna 2; peduncle with sparse robust and slender setae; peduncular article 1 longer than article 2; article 2 longer than article 3; article 3 shorter than article 1; peduncular articles 1–2 not geniculate; peduncular articles 2–3 not geniculate; accessory flagellum minute, 1­articulate; primary flagellum 5­ or more articulate; callynophore absent. Calceoli present or absent. Antenna 2 medium length; peduncle with sparse robust and slender setae; without hook­like process; flagellum shorter than peduncle, or as long as peduncle, or longer than peduncle; 5­ or more articulate; normal. Mouthparts well developed. Mandible incisor dentate; lacinia mobilis present on both sides; molar medium size, strongly triturating; palp 3­articulate. Labium outer lobes smooth. Maxilla 1 inner plate setose apically; outer plate with 11 setalteeth; palp large, 2­articulate, not clavate. Maxilla 2 inner plate without oblique setal row, without setae on medial margin. Maxilliped inner and outer plates well developed; palps well developed; outer plate longer than palp article 1, not longer than palp article 2; palp 4­ articulate.

Pereon. Pereonites complete. Coxae 1–7 well developed. Coxae 1–4 longer than broad, overlapping, coxae not ventrally acute. Coxae 1–3 similar in size, well developed, all subequal in size. Coxae 2–4 none extensively broadened. Gnathopod 1 similar in males and females (not sexually dimorphic); smaller (or weaker) than gnathopod 2, or similar in size to gnathopod 2; similar in form to gnathopod 2; subchelate; coxa subequal to coxa 2; merus and carpus not rotated; carpus/propodus not cantilevered; carpus longer than propodus, not produced along posterior margin of propodus; without robust setae along palmar margin; dactylus large. Gnathopod 2 dissimilar in males and females (sexually dimorphic); subchelate; coxa subequal to but not hidden by coxa 3; ischium short; merus not fused along, or produced away from, posterior margin of carpus; carpus short or long, shorter than propodus or longer than propodus, not produced along posterior margin of propodus; dactylus well developed. Pereopods none prehensile. Pereopods 3–4 not glandular. Pereopod 3 coxa well developed, longer than broad; carpus shorter than propodus or subequal to propodus, not produced; dactylus well developed. Pereopod 4 coxa larger than coxa 3, not ventrally acute, with well developed posteroventral lobe; carpus shorter than propodus or subequal to propodus, not produced; dactylus well developed. Pereopods 5–7 with few or many marginal slender setae and few or no robust setae. Pereopod 5 shorter than pereopod 6; coxa smaller than coxa 4, coxa equilobate or with posteroventral lobe; basis expanded, subrectangular, without posteroventral lobe; carpus slightly expanded; dactylus well developed, setae absent. Pereopod 6 shorter, extending beyond propodus of pereopod 7; basis expanded; dactylus without setae. Pereopod 7 longer than pereopod 5; similar in structure to pereopod 6; basis expanded, subquadrate, without dense slender setae; dactylus short (between 1/8 and1/4 length of propodus).

Pleon. Pleonites 1–3 without transverse dorsal serrations, without lateral teeth or ridging, without dorsal carina; without slender or robust dorsal setae. Epimeron 1 well developed. Epimeron 2 without setae. Urosome dorsoventrally flattened; urosomites 1–3 free; urosomites not carinate. Urosomite 1 longer than urosomite 2; urosomite 1 without large distoventral robust seta. Uropods 1–2 apices of rami with robust setae. Uropods 1–3 similar in structure and size. Uropod 1 peduncle without long plumose setae, without basofacial robust seta (robust or simple), without ventromedial spine. Uropod 2 without dorsal flange, without ventromedial spine. Uropod 3 peduncle short, without medial process; biramous; rami lanceolate; outer ramus longer than peduncle, without recurved spines; inner ramus longer than outer ramus, inner ramus apically setose. Telson laminar; as long as broad; notched, emarginate or entire; dorsal or lateral robust setae absent; dorsal or lateral slender setae present; apical slender setae present; apical robust setae absent.

Generic composition

Sancho Stebbing, 1897.

Distribution

South­eastern Australia.

Figures

FIGURE 6. Sanchoidae fam. nov. (Sancho kuiteri after Lowry & Barnard 2001).