Amphilochidae * Author Azman, B. A. R. text Zootaxa 2009 2009-10-08 2260 1 143 152 https://www.biotaxa.org/Zootaxa/article/view/zootaxa.2260.1.7 journal article 4654 10.11646/zootaxa.2260.1.7 8e434587-b145-47ef-9b35-fa3a130798a3 1175-5326 5323399 Amphilochus lacertus sp. nov. ( Figs 3 , 4 ) Type material . Holotype , female, 2.7 mm , AM P76251 (in slides) . Paratypes : 37 specimens , AM P 73185 , 100 m off Freshwater Beach , Lizard Island (~ 14°41’S 145°27’E ), sediment sample from sand bottom, 1.5 m , C. J. Short , 10 October 1978 (QLD 35) . Type locality . Freshwater Beach , Lizard Island , Queensland , Australia (~ 14°41’S 145°27’E ) . Etymology . Named ‘lacertus’ in Latin for lizard, after the type locality, Lizard Island. Description . Based on holotype female, 2.7 mm , AM P76251. Head. Head lateral cephalic lobes apically round, rostrum decurved, slightly beyond peduncular article 1 of antenna 1; eyes large, irregularly round with black core. Antenna 1 slightly shorter than antenna 2, peduncular articles 1–3 with few short setae distally; flagellum with about 7 articles; accessory flagellum vestigial. Antenna 2 flagellum with 6 articles. Labium bilobed, densely pubescent apically. Lower lip shoulders densely, produced inward, with 2 small teeth on each lobe, mandibular process small. Maxilla 1 inner plate missing; outer plate with 7 large teeth; palp biarticulate, extending beyond outer plate, distal segment apical margin with several fine and robust setae. Maxilla 2 inner plate broader than outer plate with several stiff setae apically. Mandible , incisor serrate; palp 3-articulate, article 2 shorter than 1, article 3 attenuate. Maxilliped inner plate margin rounded apically, distally serrate with several fine setae; outer plate apical margin with fine and robust pectinate setae; palp stout, dactylus with unguis. Pereon. Gnathopod 1 coxa subquadrate; basis lined with several long setae along anterior margin, posterodistal margin with one seta; carpus subtriangular, slightly produced posterodistally with several pectinate setae; propodus distally expanded, anterior margin without setae; palm transverse, serrate, lined with slender setae, corner defined by 2 robust setae; dactylus inner margin serrate, distally attenuate. Gnathopod 2 coxa longer than wide; basis anterior margin without seta, anterodistal with flange, posterior margin expanded distally without setae along margin, posterodistal with one short robust seta; carpus with elongate posterior lobe extending beyond edge of palm, outer margin of lobe with 3 basal robust setae, distal part with 3 robust setae; propodus broad, gradually expanding, anterior margin without setae on medial margin, palm transverse with fine setae along margin and defined by 2 robust setae; dactylus inner margin serrate, distally attenuate. Pereopod 3 coxa subrectangular; basis elongate, anterior margin with 4 medium length setae along margin; dactylus falcate. Pereopod 4 coxa expanded medially; basis slender; carpus, propodus and dactylus lost. Pereopod 5 coxa bilobed; basis subquadrate, anterior margin with 4 robust setae, posterior with fine setae along margin; merus expanded posterodistally; dactylus falcate. Pereopod 6 basis anterior margin with 5 robust setae, posterior margin medially expanded with fine setae along margin; dactylus falcate. Pereopod 7 basis expanded, anterior margin with 4 short robust setae, posterior margin with fine setae; dactylus falcate. FIGURE 3. Amphilochus lacertus sp. nov. , holotype female, 2.7 mm, AM P76251, Freshwater beach, Lizard Island, Great Barrier Reef. FIGURE 4. Amphilochus lacertus sp. nov. , holotype female, 2.7 mm, AM P76251, Freshwater beach, Lizard Island, Great Barrier Reef. TABLE 1. Comparison between the main characteristics of Australian Amphilochus .

Characters Species	Peduncular article of U2	Anterior margin of G1 basis	Eyes size	Basis of P7	Proximal article of the maxillipedal palp	Carpal lobe of G2	Dactylar unguis on the maxillipedal palp	Accessory flagellum of A1	Anterior margins of the bases of P5–P7	Width to length ratio of propodus G2	Telson
Amphilochus justi sp. nov.	Heavily setose – along lateral margin	Lacking setae	Relatively big	subquadrate	With setation	Distinctly exceeding the end of propodus	absent	absent	without sub- marginal minute robust setae	Longer than wide	>1.5x as long as wide
Amphilochus lacertus sp. nov.	Moderately setose	lined with medium length setae	Relatively big	subovate	With setation	indistinctly exceeding the end of propodus	present	vestigial	without sub- marginal minute robust setae	Longer than wide	>1.5x as long as wide
A. ruperti Moore, 1988	Lightly setose – distally	lined with short length setae	Relatively big	subovate	With setation	Not exceeding the end of propodus	absent	uniarticulate	with sub- marginal minute robust setae	Longer than wide	>1.5x as long as wide
Amphilochus marionis Stebbing, 1888	Lightly setose – distally	Lacking setae	small	subovate	Without setation	Not exceeding the end of propodus	absent	unknown	without sub- marginal minute robust setae	as long as wide	<1.5x as long as wide

Pleon. Uropod 1 rami subequal in length, with short setae along margin; peduncle slightly shorter than rami with several short setae on inner margin. Uropod 2 inner ramus longer than outer ramus, lined with short setae along medial margin; peduncle shorter rami. Uropod 3 lost. Telson entire, longer than wide, apically acute. Male (sexually dimorphic characters). Unable to determine adult male among broken specimens. Habitat . Sandy bottom. Remarks. Amphilochus lacertus sp. nov. appears to be closely related to A. justi . They more or less agree in the structure of the pleonal epimera 1–3, antennae and uropods. The gnathopods are also nearly identical, except that basis of gnathopod 1 lined with medium length setae along its anterior margin. Further, the rostrum is extending beyond article 1 of antenna 1. Among the more important features characteristic of the present species is the overall structure of maxilliped. In A. lacertus the maxilliped is somewhat stouter especially in palp articles 1–3, the presence of the dactylar unguis also add to these differences. Distribution . Australia . Queensland : Lizard Island (current study).