Denisiella betschi, Palacios-Vargas & Ferreira & Zeppelini, 2018

Palacios-Vargas, José G., Ferreira, Aila Soares & Zeppelini, Douglas, 2018, Redefinition of Denisiella Folsom & Mills, 1938 (Collembola: Sminthurididae) with description of three new species from Brazil, Zootaxa 4434 (1), pp. 111-129 : 118-122

Denisiella betschi sp. nov.

FIGS 13–25 , TABLE 1

Type material. HOLOTYPE, MALE ON SLIDE 11747, 16 III 2015. BRAZIL, PARAIBA, CAJAZEIRAS, ENG. ÁVIDOS, cOL. FERREIRA A.S . HOLOTYPE DEPOSITED AT CRFS / UEPB, JOÃO PESSOA, PARAíBA , BRAZIL. PARATYPES: 5 MALES ON SLIDE, SAME DATA AS HOLOTYPE, 2 MALES KEPT AT LESM, ScIENcES FAcULTY , UNAM, MéXIcO. LABELLED REf. # CRFS 11744 , # CRFS 11745 , # CRFS 11746 .

Description. MALE. BODY LENGTH 456 µM (MEAN 500 µM THREE MALES). ANTENNAE BENT AS IN ALL SMINTHURIDIDAE MALES, ELBOWED BETWEEN ANT. II AND III ( FIGS 13 AND 14 ). ANT. I WITH 7 SETAE TWO VERY SMALL AND THIN, OTHER SUBEqUAL IN LENGTH ( FIG. 16 ). ANT. II SHORT, WITH 23 REGULAR SETAE, TWO TRIcHOBOTHRIA (TRI1, TRI2), ONE MIcROSENSILLUM AND MODIfIED SETAE B1–6 ON THE SAME TUBERcLE, AND LAMELLA B7 ISOLATE WITH APEX TRUNcATE ( FIG. 13 ). ANT. III WITH 14 REGULAR SETAE, ONE MIcROSENSILLUM AND ONE TRIcHOBOTHRIUM (TRI3), ANT. ORGAN III WITH A PAIR Of OVAL SENSILLA; MODIfIED SETAE C1-3, C1 LAMELLATE AND SHORT, C2 SMALL SPINE AND C3 IN THE SHAPE Of STRONG SHARP SPINE ( FIG. 14 ). ANT. IV SIMPLE, ELLIPTIcAL WITH ABOUT 45 SETAE, PLUS THREE SENSILLA DIffIcULT TO DISTINGUISH ( FIG. 15 ). RATIO ANT. I: II; III; IV AS 1: 1; 0.7; 0.9. 6+6 EYES ( FIGS. 20 AND 25A ). CHAETOTAXY Of fRONTAL AREA Of HEAD WITH fOUR PAIRS Of BARBULATE SPINES AS IN FIG. 20 AND 25A , ONE Of THEM LONGER THAN OTHERS, INTEROcULAR SETAE SHORT AND THIN.

LEG I ( FIG. 17 ): cOXA WITH ONE SETA; TROcHANTER WITH 3 SETAE, ONE SHORT AND THIN; fEMUR WITH 12 SETAE; TIBIOTARSUS WITH 32 SETAE: TWO OVAL ORGANS 03pe AND 03ae PRESENT IN WHORL III AND fOUR SENSILLA IN cAMPANIfORM SHAPE IN POSITION IVe, IVae, Ve AND Vae ( FIG. 25B ). LEG II ( FIG. 18 ): cOXA WITH ONE SETA; TROcHANTER WITH 3 SETAE, ONE SHORT AND THIN IN VENTRAL POSITION; fEMUR WITH 11 SETAE; TIBIOTARSUS WITH 35 SETAE: TWO OVAL ORGANS 03pe AND 03ae PRESENT IN WHORL III AND POLYcARINATE SETA Vai PRESENT ( FIG. 25C ). LEG III ( FIG. 19 ): cOXA WITH 3 SETAE AND ONE SMALL SPINE; TROcHANTER WITH 3 SETAE, ONE Of THEM SHORT AND THIN; fEMUR WITH 11 SETAE; TIBIOTARSUS WITH ABOUT 34 SETAE: TWO OVAL ORGANS 03pe AND 03ae PRESENT IN WHORL III AND fOUR SERRATE SPINE-LIKE IN POSITION IIp, IIIp, IVpi, Vp ( FIG. 25D ). UNGUIS WITHOUT TUNIcA, WITH PSEUDONYcHIA; UNGUIS I, II AND III WITH ONE SMALL INNER TOOTH ( FIG. 25E ); UNGUIcULUS I AND II WITH fILAMENT SURPASSING THE UNGUIS. PRETARSUS WITH ONE ANTERIOR AND ONE POSTERIOR SETAE ON EAcH LEG.

THORAcIc SEGMENTATION NOT EVIDENT DORSALLY. GREAT ABDOMEN WITH TRIcHOBOTHRIA A/B/C TRIANGLE SHAPED. SMALL ABDOMEN WITH TRIcHOBOTHRIA D/E ( FIG. 21 ). VENTRAL TUBE WITH 1+1 SETA IN POSTERIOR POSITION. CORPUS Of TENAcULUM WITH TWO SETAE AND EAcH RAMUS WITH THREE TEETH AND BASAL APPENDIX. GENITAL AND ANAL SEGMENTS fUSED INTO A SINGLE MASS. GENITAL PLATE Of MALE WITH ONE PAIR Of PREGENITAL SETAE AND 4 + 4 EUGENITAL SETAE ( FIG. 21 ). MANUBRIUM WITH 7+7 SETAE, DENS WITH 37 POSTERIOR SETAE ( FIG. 22 ), ANTERIOR SURfAcE WITH SETAL fORMULA 3,3,3,3,2,1,1,1 ( FIG. 23 ). MUcRO WITH TWO LAMELLAE, INNER WITH ABOUT 16 SERRATIONS, OUTER SMOOTH, ONE MUcRONAL OUTER SETA ( FIGS. 24 AND 25F ). FEMALE UNKNOWN.

Etymology. THE NEW SPEcIES IS NAMED AfTER DR. JEAN-MARIE BETScH, AS A REcOGNITION fOR HIS MAJOR cONTRIBUTIONS TO THE KNOWLEDGE ON COLLEMBOLA SYMPHYPLEONA .

Distribution and habitat. THE SPEcIMENS WERE cOLLEcTED DURING THE BEGINNING Of THE RAINY SEASON IN A SEMIARID CAATINGA DOMAIN, LOcATED IN STATE Of PARAIBA, NORTHEASTERN BRAZIL (06°58' 27.7' 'S/34° 27' 32.2' ' W) GOOD’S BIOGEOGRAPHIc ZONE 27 ( GOOD1974).

Remarks. Denisiella betschi sp. nov. IS VERY EASY TO DISTINGUISH fROM OTHER Denisiella BEcAUSE IT HAS BARBULATE SPINES ON fRONTAL HEAD THAT HAVE NEVER BEEN cITED IN OTHER SPEcIES. THE ANTENNAL SEGMENT II IS VERY SHORT AND THE SETA B7 IS TRUNcATE. THE RATIO Of ANT. III: ANT. II IS ONLY 1.4, WHILE IN D. caatingae sp. nov. AND D. rhizophorae sp. nov. SUcH RATIOS ARE 1.7 AND 1.8 RESPEcTIVELY. THE fOUR SENSILLA ON TIBIOTARSUS I ARE cAMPANIfORM AND RUGOSE, SIMILAR TO THOSE Of D. diomedesi AND D. maesorum ( TABLE 1). MALES ARE THE SMALLEST AMONG ALL THE SPEcIES Of THE GENUS KNOWN, SMALLER THAN 600 µM.

Figures

FIGURE 25 A–F. Denisiella betschi sp. nov., Scanning Electronic Microscope (SEM): A, eyes: 6 + 6 ommatidia; B, four sensilla of tibiotarsus I; C, polycarinate seta of tibiotarsus II; D, serrate spine-like setae of tibiotarsus III; E, unguis III with inner tooth; F, mucro.

FIGURES 13–16. Denisiella betschi sp. nov.: 13, Ant. II; 14, Ant. III; 15, Ant. IV; 16, Ant. I.

FIGURES 17–19. Denisiella betschi sp. nov.: 17, leg I: trochanter, femur and chaetotaxy of tibiotarsus; 18, leg II: trochanter, femur and chaetotaxy of tibiotarsus; 19, leg III: trochanter, femur and chaetotaxy tibiotarsus.

FIGURES 20–24. Denisiella betschi sp. nov.: 20, frontal cephalic cheatotaxy; 21, chaetotaxy of small abdomen and genital plate of male in lateral view; 22, posterior chaetotaxy of dens; 23, anterior chaetotaxy of dens; 24, mucro.