Site

Site on host. Gill filaments.

Type locality. River Paragua , near confluence with Iténez River (Amazon basin), 13°32’24.8”S 61°49’27.4”W, Province Beni, Bolivia GoogleMaps .

Type specimens. Holotype: adult female ( CHIOC 38685 View Materials a) . Paratype specimens: 9 female specimens ( CHIOC 38685 View Materials b-q) .

Etymology. The specific name is in honor of the late Dr. Michael Türkay (Research Institute and Natural History Museum Senckenberg (Frankfurt am Main, Germany) for his extensive contributions to the study of Crustacea.

Description. Adult female ( Fig. 1A–I View Figure 1 ) [based on 10 specimens]. Body length from anterior margin of prosometoposteriorofcaudalrami522–689 µm(603;n = 10). Body comprising prosome and urosome, bearing multiple small sensilla along entire body ( Fig. 2C View Figure 2 ); prosome consisting of non-inflated, triangular cephalosome and 4 pedigerous somites. Rostrum presenting a row of frontal sensilla. Cephalosome and first pedigerous not fused.Cephalosome less than twice width, comprising more than 50% of body length. Urosome ( Fig. 1C View Figure 1 ) consisting of 5 pedigerous somite, double genital somite, 3 free abdominal somites. Double-genital somite barrel-shaped, narrowing posteriorly, ventral surface lacking spinules. Abdominal somites with row of spinules on postero-ventral margins. Second abdominal somite presenting a blunt pseudoperculum ( Fig. 2A, B View Figure 2 ). Caudal ramus longer than wide, armed with one long, one median, and two smaller lateral setae; spinules absent. Two long egg sacs with 2–3 rows of eggs.

Antennule ( Fig. 1F View Figure 1 ) with 6 segments, tapering distally, aesthetascs present on fifth and sixth segments. Setal formula: 1:9:5:4:1+1 ae: 5+2 ae.

Antenna ( Fig. 1B View Figure 1 ) comprising coxobasis, threesegmented endopod, and terminal claw. Coxobasis short, presenting tiny distal seta at inner distal corner; membrane between coxa and first segment of endopod not inflated. First endopodal segment with length/width ratio approximately 3; sensillum near mid length. Second segment curved, as long as first segment, presenting proximal sensillum and small distal sensillum. Third endopodal segment with single seta. Claw evenly curved, with small pit (fossa) distally on concave margin.

Mouthparts ( Fig. 1D View Figure 1 ) comprising mandible, maxilla and maxillule; maxilliped absent. Mandible with median and posterior blades; anterior blade absent; median blade completely toothed. Basis of maxilla partially toothed, with a sensillum on proximal region, spinulated setae on maxilla absent. Two setal elements on maxillule present.

Interpodal plates ( Fig. 1E View Figure 1 ) of all legs ornamented with spinules ventrally, variable in number and distribution among plates. Swimming legs 1–4 biramous and with separate coxa and basis.Armature of legs (setae,Arabic numerals; spines, Roman numerals) as in Tab.1.

Leg 1 ( Fig. 1G View Figure 1 ). Coxa with smooth margins, lacking spinules; basis with smooth margins, lacking spinules, with proximal outer seta. Exopod with 3 segments; first segment pilose on inner margin, with spinules distally on outer margin, lacking inner seta, distal spine on outer margin present; second segment with spinules on entire outer margin, with one seta, distal spine absent; third segment with spinules distally on outer margin, with one pectinate seta and four pilose setae, two distal spines spinulated.Endopod with 2 segments; first segment not pilose, with spinules on entire outer margin, with one seta; second segment with spinules on entire outer margin, with five setae and two straight spines, only outer spine spinulated.

Legs 2 and 3 similar ( Fig. 1H View Figure 1 ). Coxa ornamented with spinules; basis lacking spinules, with proximal seta. Exopod presenting 3 segments; first segment twice as long than wide, pilose on inner and outer sides, with spinules on all outer margin with non-spinulated distal spine, lacking seta; second segment with spinules on entire outer margin, with one seta, distal spine absent; third segment with spinules on entire outer margin, with six setae and one non-spinulated spine. Endopod with 3 segments; first segment pilose on outer side, with spinules on entire outer margin, with one seta; second segment not pilose, with spinules on entire outer margin, with two setae, distal spine absent; third segment with spinules on entire outer margin, with four setae and one non-spinulated distal spine.

Leg 4 ( Fig 1I View Figure 1 ). Coxa ornamented with spinules; basis presenting single small proximal seta. Exopod with 2 segments; first segment pilose on inner margin, lacking spinules, lacking seta, with one non-spinulated distal spine; second segment lacking spinules, with four setae and one non-spinulated distal spine. Endopod with 2 segments; first segment pilose on outer side, with spinules on entire outer margin and one seta; second segment with spinules on entire outer margin, with five setae and one non-spinulated distal spine.

Leg 5 ( Fig. 1C View Figure 1 ). Reduced to 2 unequal setae.