New species of subterranean and endogean terrestrial isopods (Crustacea, Oniscidea) from Tuscany (central Italy) Author Taiti, Stefano Author Montesanto, Giuseppe text Zoosystema 2018 2018-06-05 40 11 197 226 journal article 10.5252/zoosystema2018v40a11 19cf9485-c4c2-4bf1-a834-f13dfcfc50e1 1638-9387 3741502 urn:lsid:zoobank.org:pub:E8AFD7E7-4FDD-408E-BB77-75E61F2BF22F Alloschizidium labronicum n. sp. ( Figs 18-20 , 21G ) urn:lsid:zoobank.org:act: 3B 200712 -4876-4ED3-BEA3-1607966B9900 TYPE MATERIAL . — Holotype . ♂ , Ponte Maroccone , Antignano , 1.5 km S of Antignano , 43°28’47”N , 10°20’02”E , 20 m a.s.l. , holm oak wood, under deeply enbedded stones, leg. S. Taiti , 29.III.1986 ( MZUF 9677 ) . Paratypes . 2 ♀ , same data as holotype ( MZUF 9677 ); 1 ♀ , near Livorno , holm oak wood, leg. S. Zoia , 28.V.1980 ( MZUF 9678 ) . DIAGNOSIS. — A blind, colourless species of Alloschizidium characterized by piliform dorsal scale-setae, cephalon with reduced postscutellar line, telson trapezoidal, as wide as long with truncate apex, uropodal exopod as wide as long, male pleopod 1 exopod with broadly rounded medial margin. ETYMOLOGY. — From the Latin name labronicus = inhabitant of Labro , cited in a letter by Marcus Tullius Cicero, and which refers to the Tuscan town of Leghorn (Livorno in Italian). DESCRIPTION Maximum length: ♂ , 3 mm ; ♀ , 4 mm . Body colourless, strongly convex with vertical epimera, able to roll up into a perfect ball ( Fig. 18A ). Back smooth covered with piliform scale-setae ( Fig. 18B ). Cephalon ( Fig. 18C, D ) with triangular scutellum slightly depressed in the middle and distinctly separated from vertex but not protruding above it; frontal line continuing the scutellar upper margin; postscutellar line reduced; antennary lobes quadrangular, obliquely directed frontwards; eyes absent. Pereonite 1 ( Fig. 18E ) with posterior margin slightly concave; postero-lateral schisma with outer lobe rounded and distinctly protruding backwards; lateral margin slightly thickened. Pereonites 1-3 with small rounded ventral tooth. Telson ( Fig. 18F ) trapezoidal, almost as long as wide, with slightly concave sides and truncate apex. Antennula ( Fig. 18G ) of three articles, tuft of about five aesthetascs. Antenna ( Fig. 18H ) with flagellum as long as fifth article of peduncle; second flagellar article about three times as long as first and bearing 1 + 1 + 3 aesthetascs. Mandibles ( Fig. 19A, B ) with molar penicil consisting of many setae and 2 + 2 free penicils on the left and 1 + 2 on the right mandible. Maxillula ( Fig. 19C ) outer branch with 4+6 (5 slightly cleft) teeth, inner branch with two stout penicils. Maxilla ( Fig. 19D ) with bilobed and setose apex. Maxilliped ( Fig. 19E ) endite with two triangular terminal spines, one subterminal strong seta and triangular spine on medial margin. Pleopod 1 and 2 exopods with monospiracular covered lungs. Uropod ( Fig. 19F ) with exopod flattened, almost as long as wide; endopod longer than exopod. FIG. 18. — Alloschizidium labronicum n. sp. , from Maroccone,♀ paratype: A , adult specimen,lateral view; B , dorsal scale-seta; C , cephalon,frontal view; D , cepha- lon, dorsal view; E , epimeron of pereonite 1, dorsal view; F , telson and uropods, dorsal view; G , antennula; H , antenna. Scale bar: A, 1 mm. FIG. 19. — Alloschizidium labronicum n. sp. , from Maroccone, ♀ paratype: A , left mandible; B , right mandible; C , maxillula; D , maxilla; E , maxilliped; F , uropod. Male Pereopod 1 ( Fig. 20A ) carpus with two lines of strong setae with multipointed apices near sternal margin. Pereopod 7 ( Fig. 20B ) with no distinct sexual modifications, ischium with straight sternal margin. Pleopod 1 ( Fig. 20C ) exopod about twice as wide as long, with broadly rounded medial margin; endopod with apical part thickset, straight, and bearing a row of short setae. Pleopod 2 ( Fig. 20D ) exopod triangular with slightly concave outer margin bearing single seta; endopod narrow and distinctly longer than exopod. Pleopod 3-5 exopods as in Fig. 20E-G . REMARKS The genus Alloschizidium comprises 12 species with a Tyrrhenian distribution ( Schmalfuss 2003 ; Taiti & Argano 2009 ). In having the dorsal surface covered with piliform scale-setae, the new species resembles A. sardoum ( Arcangeli, 1933 ) from Sardinian caves, A. remyi (Vandel, 1944) from Corsica , A. eeae Argano & Utzeri, 1973 from Ponza Island, and A. cavernicolum Taiti & Ferrara, 1995 from a cave in southern Tuscany. It differs from A. sardoum and A. eeae in having shorter telson and uropodal exopods as wide as long instead of longer than wide; from A. sardoum , A. remyi and A. eeae in the male pleo- pod 1 exopod without posterior point; from A. remyi also in the absence of any trace of eyes (a single ocellum in A. remyi is distinctly visible, see Taiti & Ferrara 1996 ).