Spelunconiscus septemlacuum, Ferreira, 2022

Spelunconiscus septemlacuum View in CoL sp. nov.

( Figs. 6–8 View Figure 6 View Figure 7 View Figure 8 )

Zoobank: urn:lsid:zoobank.org:act:D665B2ED-60DF-480C-B716-E32FEDE0BE98

Etymology. The specific epithet means septem (seven) + lacuum (lakes) in Latin, in reference to the name of the municipality where the cave is located (Sete Lagoas, in Portuguese, meaning “seven lakes”).

Material examined. Holotype: male (ISLA 79134), June 2018, Taboa Cave, Sete Lagoas , Minas Gerais, Brazil (19°28’30.00”S 44°19’41.70”W); coll. R. Ferreira GoogleMaps . Paratypes: 3 males ( ISLA 62791, ISLA 62792, ISLA 62793) and 1 female ( ISLA 62794) mounted on slides, July and December 2015 ; 3 males ( ISLA 79133) , 5females ( ISLA 62797), same data as holotype GoogleMaps ; 1 male mounted on slide (ISLA 62790), Tatuzinhos cave , Sete Lagoas, Minas Gerais, Brazil (19°28’26.28”S 44°20’1.60”W), July 2015, coll. F. Bondezanll. GoogleMaps

Diagnosis. Antennula distal article with 5 long aesthetascs. Antenna fifth article of peduncle longer than flagellum; flagellum with 4 or 5 articles proximal article longer (subequal in length to the distal ones). Pleopod II exopod sub-rectangular, distal margin straight; endopod three to fourfold longer than exopod, distal article about twofold longer than proximal, about fourfold longer than wide, robust, cylindrical, with beak-like distal portion, proximally with lateral lobe, distally with digitiform structure and several small projections.

Description. Maximum body length: 10.6 mm. Body unpigmented, slender, flexible, able to bend, surface smooth, with pointed scale setae ( Fig. 6A View Figure 6 ). Eyes absent. Cephalon trapezoidal in dorsal view; posterior margin straight; less than half of its length, inserted in pereonite 1; small quadrangular antennal lobes; vertex with 2 shallow transverse antero-lateral grooves; profrons with supra-antennal line medially truncated, directed to projected clypeus. Antennula distal article longer than second and first; second article shorter than first, distal article with 5apical aesthetascs ( Fig.6B View Figure 6 ).Antenna fifth article of peduncle article longer than flagellum; flagellum with4 to 5 articles, proximal article longer (subequal in length to distal ones) ( Fig. 6C View Figure 6 ). Right mandible with 1 penicil; distal leaf-shaped (serrate) lacinia; molar process with 1 short penicil ( Fig. 6D View Figure 6 ). Left mandible with 2 penicils ( Fig. 6E View Figure 6 ). Maxillula outer branch with 5 + 5 teeth apically entire and 1 slender stalk; inner branch with 3 penicils, inner penicil longest ( Fig. 6F View Figure 6 ). Maxilla setose, inner lobe larger than outer lobe ( Fig. 6G View Figure 6 ). Maxilliped basis triangular enlarged on distal portion, outer, inner, and distal margins with fringe of thin setae; palp with 3 projections, each of them with 1 tuft of setae; endite narrow, densely setose, narrowing towards apex with large conical penicil not attaining palp first tuft of setae, 1 proximal spine at each side ( Fig. 6H View Figure 6 ). Pereopod I carpus with antennal grooming brush ( Fig. 7A View Figure 7 ). Pereopod VII basis with water-conducting scale-rows on caudal face, dactyli with glabrous and unbranched dactylar setae. Uropod endopod slightly shorter than exopod, both inserted at same level; exopod more than twice the protopod length ( Fig. 6I View Figure 6 ).

Male. Pereopod VII ischium rostral face with spur-like structure ( Fig. 8A View Figure 8 ). Genital papilla lanceolate. Pleopod I exopod triangular; endopod 2-jointed; protopod external half enlarged projecting laterodistally, with simple setae on lateral and distal margins ( Fig. 8B View Figure 8 ). Pleopod II exopod sub-rectangular, with rounded vertices, distal margin straight; endopod 2-jointed, three- to fourfold longer than exopod, distal article about twofold longer than proximal, about fourfold longer than wide, robust, cylindrical, with beak-like distal portion, proximally with lateral lobe, distally with digitiform structure and several small projections( Fig.8C–E View Figure 8 ). Pleopod exopods III to V subtrapezoidal with short setae at margins ( Fig. 8F–H View Figure 8 ).