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Arizona Hydrobiidae (Prosobranchia: Rissoacsa) Robert Hershier and J

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Arizona Hydrobiidae (Prosobranchia: Rissoacsa) Robert Hershier and J Arizona Hydrobiidae (Prosobranchia: Rissoacsa) Robert Hershier and J. Jerry Landye ABSTRACT - - Hr..7h1P-r, Robert. and J. Jerry Landye. Arizona Hydrobii , (Frosobranchia: Rissoacea).-A diverse fauna of Arizona Hydrobiidae is doritmentr-d as a result of recent collecting from numerous springs in the state. The fauna is comPosed of 14 smecies in two g.=ner,... , Evrmulomr4i= CA.11 and Filsbrv and Trvonia 4 .4.-_ 5tiMPSOM. ,n r =mxciPs are described as new nerein arc tne fourteenth represents a new record for the state. All of thi= sPecies have relatively rr-.=.trir- ted distributors. and two are sinsle sPring endemics. All congeners are allcmatrir- to one anr,ther. StaPwise canonical discriminant function analyses using sets of and anatomical data confirmed the distinctiveness of the 12 species' of Arizona FyrguloPsis. as classification of (grlip,=.d) topotypes was 89-93% based on analyses using shell data. and 100% for analyses using anatomical data. The discriminant analyses also confirmed that diff nti...-ttir,n ,amonp congeners largely involves male anatomy (especially menial features), as this data set yielded the best separatirn of species in plots of scores on the first two discriminant functions. 2 Robert Hershler, Department of Invertebrate Zoology, National Museum of Natural History. The Smithsonian Institution, Washington, D.C. 20560. J. Jerry Landye, Arizona Game and Fish DePartment, HC 66. Box 2205, Cornvills. AZ 66325. 3 Arizona ;yOrotiidae (Fri sobranchia: Rissoacea Robert Hershier and J. j:=rr.,,, -=1 .ndv.=, Introduction caobranch sn: i of the -F asnil , Hvdrobiidae comPrise a diverse 3 4444411. id to71)414411L-Via component of the .gr..-44.1i,=;..4.- -F auna (di the American with A numerous locally ehd:=171i7 ieoleted complexee or drainage te!:1- t'T-J- d-u=nout tn-E r;A.4 1966; Land 1977 in P rt H11.= t71 4.4.0:- 0 - colisctr and studying thess minute nei la. th,=,v remain Poorly known in the 44--- VeT4P- N . - , The:-e are no publienedA mods:n. r7 nem=ivi= - - 1441.4.0 systemat c tratmen o " -f aunas - - but ass A Taylor, 1987Aand what little work has teen done larei 0=Si-57E of isolat;.d ecies descriPtions based cn study emt shell. There is a clear and urgent need to address the systematics of this fauna given the f=(f- t that many .B.4-44=b4i.ci.e OAR, , - . r=c- r LT.-rcl;..t..14: threatened or endA.ngerd as a r,==,,Itit of A deterioration or disaPpearance of natural aquatic habitats 4.A.-44-gra. (Taylor, 137('a). As an illustration, 12 of 21 southwestern species being considered for federal listing threatened or endangeredcre und;=srribedie(lai., 1984) A To further this end, we present ir a systematic description of Arizona Hydrobiidae. To date, this fauna has been largely ignored by malacologist=.. Prior to 197, the __le published record of live-collected hydrobiids from the state was by Pilsbry and Ferriss (1909)A who obtained Paludestrina stearnsiana from a i)v single spring in the Huachuca Mountains. In their monograph on 4 Arizona mollusks, ;;;...guart and Miller (1973) listed EiX additional such record far the family. rePresentinp sP.vPr,:kl possible species. Additional records of collections of Recent or subfossil shell are listed Taylor (1970b, 1975). In the past 20 years the junior authar has intensively surveyed permanent Arizona waters and found 4.0reol a lar:pe hydrobiid fauna) with P.,:timatx.ri SCCI1C divf=rsity raning upwards to 18 sPecies (see Landv,.. 1973; Landve. 1581; William= ea al.. 192E). The bulk of thi=, coll ection. larPe alcohol holdinpE from localities in the state and PeriPheral areas ;Fig. 1). WSE made available to the senior author- whose taxonomic work is .- - pr.=---,=ni-:,=d herein. rt .=.,=p.....r:A.t-,= p.,-4.pr tr .-.-4.ting .. ologic=.1 :,nri biopeograpical aspects of the fauna will be published elsewhere. -c Fourteen sPecies are recognized 47; t.7 iii 4--'r representing two -.> genera, Tryonia Stimpson, 1865 and Fyrpulopsis Call and PilEbry, 1886. Thirteen of the species are new. and the fourteenth. sea& PyrPulapsis deserta (Pilsbry). represents a new record. A _,■0=' tot S tepwise discriminant function analyses using separate shell and anatomical data sets were performed in order to examine -, - , pat tern a of variation and tR.= t tql 0=th:=r the 12 new. alloPatric FyrpuloPsis app. are distinct -From one another. F 1.1'7,T OF RED:GNU:ED SPECIES Fyrgulomsis glandulosus Hershler, n. sm. Fvrgulomsis deserts (Pilsbry) Fvrquiomsis bac:hus Hersrier. n. SP. P'yrpulomsis conicus Hersrler, n. sm. Fvrpulopsis morrisori Hersrier, n.sm. PvrpuloPsis mon1e7 srsHs Hsrshlsr, m. P',rg loPsis sol_a Hershier, n. sp. F\irmuloPsis simPlex Hersrier, n. sp. Fvrgulomsis sancarlr,sersIs Hershler, r. sp. Pyrmulomsis cflrHluentis H fliCr fl. Esp Fvrmulomsis cocrisi Her-shier. n. SP. FYr7U1OPSiS CMPSC:i Hersrler, n. sm. Trycnia milae Hershisr, n. SP. Tryonia guitobamuitae Hershler, n. sp. MATERIALS AND METHODS MATERIAL EXAMINED. Material from 35 localities (Fig. 1), totalling 48 lots, was collected uci/114 a fine-meshed hand sieve, relaxed with menthol crystals, fixed in dilute formalin and preserved in 70% ethanol. Most eii.40felre lots --- t erreht.- 100 specimens; Aocality data -ibt-i4a—tizsdabzia•-e7:..*--e-i-tr.F-A- ." are in Al! Appendix 1. Th.s. cf this material is housed in the United States National Museum collection (USNM catalog numbers ma, are referred to below), ;Ether relevant material from thOlar collection and that of the Academy of Natural Sciences of 6 Philadelphia ( ANSR) was also examined. MORPHOLOGIC STUDY. Shells and animals were studied and measured at 50X using WILD M-5 and M-7 dissecting microscopes egitipged with ocular micrometers. Shells. ogerculae and radulae were photographed using a HITACHI 5-570 scanning electron esem) micrcscoPe. Ts obtain intact bodies for disssctisn 4 shells were A de.dalciiied by scakinT in ccncentrataz Eduin = .A.P.4.4404,4" th ,= r=maininq pe=1 1-idle was AMiM:4, 1:7" were di===,... ,,,Jd in dilute Ebuin's Sclittif7n. 7c examine penial mor7,holo.=%/ and aA44.444A ciliation patt ,=rn= on tn= neni and w=re dried g=inq nr-7NTTIN DCF-1 Critical Foint Drier 4f.pf tni=m • C ,7ntinurots and ( to a lesser extent maristiz data were obtained 544,erid 71. 4 1/ from hei 1 and anatomy sgesimens Pvrgitlogsi= ( Table 1) for use in d scriminant function analyses. _____________ She 1 La were cleaned with CLOROX to remove surface dePcsits) .F4102.001i44 41=0Me*w*Or5+ oriented in the standard aPertural aspect. 4strweca44.1wavaliwuket(werse am14.a... first pinPointe477-777;77a0 necessary points 44..em or aspects of 44.4., shell outlin:r:nto paper using a camera lucida. Distances between 411: aQ. points were then determined using a fine-scaled millimeter ruler. The following characters were measured or counted: (1) number of whorls (NW) (2) shell hei9ht (SW 7 (3) shell width (SW) (4) aperture heiciht (AH) (5) aperture width (AW) (6) height of bddy whorl (LEW) (7) width of body whorl (WELL) (I;) 1,=ngtn of line ronn=cting sutures at posterior ends o+ body and Penultimate whorls (9) maximum Pe!-- gendiduiar distance between line joining the a 7vc= =utur S. and outline c+ penultimate whorl The +allowing ratios ware -F ormed UEiMq the above data: (1) =n=.11 height _shell width (ZH/EW nc ht (:::( H/EH) (3) body whorl lenqth/sh= 1 1 height (L7M/SH) (4) whorl convexity (CD/ AE), +allowing measure provided n and Riggs (1975: F. 352) Anatomical counts and measurements were taken from five males 4416‘ and five females from lot. Body and gonad lengths were 6 measured with the animal pinned iiihmost in 5 41.. apical aspect. The penis was cut from the neck. and 40,A measured in 4.19,e- dorsal aspect. The pallial roof and visceral coil were removed from the head/foot and 4400 separated from one another along the end of the pallial cavity. Fallial structures were measured with the pallial roof flattened eftm4 and pinned. The following counts and measurements were made (1-7, both sexes; 8-21, females: 23-30, males): (1) body length (EL) (2) oePhrabium length (CI L) (3) osPhradium width (DEW) (4) distance from posterior end of osphradium to Posterior tip of ctenidium (OCT) (';) ctenidium length (CTL) (6) ctenitium width (1-7W) 7 C, number of ctenidial i'laments (8) ovary ienqr (CL. (9) caPsule l no lenczth (Cf;L) (1()) capsuis glanc widtn G2GW) 1 - ,7 ( 11 ;,11.;UM=7 p1 -Ino lemsrh ( CL) (12) albumen sland width (Jf Eli,; (13) diameter (anterior-postrior) anterior coil of oviduct (EC' ) (14) distance from anterior End of oviduct coil to posterior end of capsule gland (COP) (15) maximum diameter of anterior portion of oviduct (COD) (16) bursa copulatrix length (BUL) (17) bursa copulatrix width (KM) (18) width of bursa cogulatrix duct (BDW) (19) distance from posterior end of albumen gland to posterior tip of bursa (BAG) (20) seminal receptacle (body plus duct) length ( SRL) (21) seminal receptacle width (SRW) (22) testis length (TS) (23) prostate gland length (LPR) (24) prostate gland width (WRR) 5 (25) 1em3th of Fenis from ditse to tip Fenial lobe (L2) (26) Penis width (at base) (EW) (27) distance from base of penis to b..=,.se of Penial filament (L3) (28) Fenial filament lerczth ( LFI) (29) penial filament width (WFI) (30) number of glandular r1d9es on penis (GLR) - , - -, Ti s followin7t fi7rmr.-d it ing these amatomii t1 (i both sexes: 4-. females: 10-14. males): (1) osphradium 1F-TIgt, 1 enidium lenth (DELSCTL) (2) distance from posterior tip of osphradium to ctenitium t iF 1A,ngth (OCT 'CTL) (3) ctenitium 1 1-1qth (171-1 ) (4) ovary length/body 1=,ngth (n)/7,1
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