searchable PDF - Association for Mexican Cave Studies

plate; and e) coxa 1 larger than coxa 2. Despitethese important differences, this genus and Me.xiweckeliaare apparently closely related, as alreadyindicated. This relationship is strongly supported byseveral mouthpart characters of the new species describedbelow that appear to be intermediate betweenthe two genera. Holsingerius is also closely relatedto Te.xiweckelia, as evidenced by their number ofshared similarities, which include especially thestructure of the gnathopods, coxae, and uropods (seeHolsinger and Longley, 1980).Holsingerius smaragdinus, new speciesFigs. 7-9Material examined.-TEXAS: Val VerdeCounty: Emerald Sink (Cave), 3.2 km N of Langtry,female holotype and 3 female paratypes, D. Cannyand S. J. Harden, 25 May 1985; 2 female paratypes,R. M. Waters, 31 Mar. 1984.The holotype is deposited in the National Museumof Natural History (USNM 239478); paratypesare deposited in the author's collection.Diagnosis.-A medium-sized cavemicolous speciesintermediate in some mouthpart characters betweenMe.xiweckelia and Holsingerius but havingmore characters of the latter and herein provisionallyassigned to this genus. Distinguished from Holsingeriussamacos, the only other species in this genus,by presence of a vestigial lacinia mobilis onright mandible; smaller inner plate of maxilla 1 withapproximately 1/2 as many medial setae; shorter innerplate of maxilla 2, which is not sub-rectangularin shape and has significantly fewer facial setae;shorter row of plumose setae on inner margin of innerplate of maxilliped; absence of setules from uppermargins of dactyls of pereopods 5-7; and presenceof long, plumose setae on inner or outer ramiof uropods 1 and 2. Largest female, 8.5 mm; maleunknown.Female.-Antenna 1 85-90% length of body, ca.65 % longer than antenna 2, primary flagellum with39-42 segments, lacking esthetascs; accessory flagellumabsent. Antenna 2 with 13 flagellar segments.Mandible: molars prominent; right mandible withspine apparently representing vestigial lacinia mobilis,2 long plumose accessory spines and molar seta;left with well developed, 4-dentate lacinia mobilis, 2accessory spines, but lacking molar seta. Inner lobesof lower lip vestigial or absent. Maxilla 1: innerplate with 19-20 medial, plumose setae; outer platewith 7 apical, serrate spines; palps symmetrical,broadest distally, bearing 4 spines at or near apexand 4-5 setae subapically (cf., Holsingerius samacos).Maxilla 2: inner plate narrowing distally, withoblique, submarginal row of ca. 29 naked, facial setae.Maxilliped: inner plate rather broad, bearing 4bladespines apically and setae apically/subapically,and row of plumose setae on inner margin; outerplate broadest medially, bearing short row of bladespineson inner margin near apex; palp segment 3with inner distal lobe.Gnathopod I: propod proportionately small, palmshort, with few tiny spines and several setae, medialfacial setae few, posterior margin longer than palm,with setae; carpus longer than propod, producedposteriorly into prominent, pubescent lobe which isbroadest proximal to distal end (as in H. samacos),bearing several groups of long setae; posterior marginof basis setose; coxa rather deep and broadly expanded,with 2 short, marginal setae. Gnathopod 2:propod relatively narrow, elongate, narrowingslightly and unevenly distally, palm oblique, short,armed with double row of ca. 6 small spine teeth,defining angle with several tiny spines and 2 longsetae, medial (inner facial) setae absent, but both anteriorand posterior margins bearing row of long setae;dactyl short, rather stout, nail short; carpussubtriangular, posterior margin lobiform and pubescent,lobe broadest proximal to distal end (as ingnathopod 1 and in H. samacos), bearing 5 or 6clusters of long setae; coxa smaller than that ofgnathopod 1, little deeper than broad. Pereopods 3and 4 subequal, bases rather broad and bearing shortspines on anterior margin and longer (slender)spines on posterior margin; coxa about as deep asbroad, with 2 marginal setules; coxa 4 not lobate.Pereopod 7 65-70% length of body, little longerthan pereopod 6, ca. 25 % longer than pereopod 5.Bases of pereopods 5-7 moderately broad, posteriormargins broadly convex, distoposterior lobes welldeveloped; dactyl of pereopod 5 about 50% lengthof corresponding propod, dactyls of pereopods 6 and7 ca. 35-40 % length of corresponding propods; dactylswithout setules on upper margins. Coxal gillslarge, prominent, usually ellipsoidal, sometimessubovate, with distinct peduncles. Brood platessmall, narrow, and nonsetose in material examined.Pleonal plates similar to those of H. samacos,comers produced (especially plates 2 and 3), bearingI setule each. Pleopod peduncles with 6-7 couplingspines each on inner margins. Uronites 1 and 2 with2 small dorsodistal spines each, uronite 3 with 6-8such spines. Uropod I: inner ramus subequal inlength to outer, shorter than peduncle, with about 5apical and 2 lateral spines; outer ramus with apicaland lateral spines and row of 5 rather long, plumose12