Alloschizidium labronicum, Taiti & Montesanto, 2018

Taiti, Stefano & Montesanto, Giuseppe, 2018, New species of subterranean and endogean terrestrial isopods (Crustacea, Oniscidea) from Tuscany (central Italy), Zoosystema 40 (11), pp. 197-226 : 218-220

publication ID	https://doi.org/ 10.5252/zoosystema2018v40a11
publication LSID	urn:lsid:zoobank.org:pub:E8AFD7E7-4FDD-408E-BB77-75E61F2BF22F
DOI	https://doi.org/10.5281/zenodo.3810291
persistent identifier	https://treatment.plazi.org/id/3B200712-4876-4ED3-BEA3-1607966B9900
taxon LSID	lsid:zoobank.org:act:3B200712-4876-4ED3-BEA3-1607966B9900
treatment provided by	Felipe
scientific name	Alloschizidium labronicum
status	sp. nov.

Treatment

Alloschizidium labronicum View in CoL n. sp.

( Figs 18-20 View FIG View FIG View FIG , 21G View FIG )

urn:lsid:zoobank.org:act:3B200712-4876-4ED3-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 ) GoogleMaps . Paratypes. 2 ♀, same data as holotype ( MZUF 9677 ); GoogleMaps 1 ♀, near Livorno , holm oak wood, leg. S. Zoia, 28.V.1980 ( MZUF 9678 ) GoogleMaps .

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 View FIG ). Back smooth covered with piliform scale-setae ( Fig. 18B View FIG ). Cephalon ( Fig. 18C, D View FIG ) 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 View FIG ) 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 View FIG ) trapezoidal, almost as long as wide, with slightly concave sides and truncate apex. Antennula ( Fig. 18G View FIG ) of three articles, tuft of about five aesthetascs. Antenna ( Fig. 18H View FIG ) 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 View FIG ) 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 View FIG ) outer branch with 4+6 (5 slightly cleft) teeth, inner branch with two stout penicils. Maxilla ( Fig. 19D View FIG ) with bilobed and setose apex. Maxilliped ( Fig. 19E View FIG ) 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 View FIG ) with exopod flattened, almost as long as wide; endopod longer than exopod.

Male

Pereopod 1 ( Fig. 20A View FIG ) carpus with two lines of strong setae with multipointed apices near sternal margin. Pereopod 7 ( Fig. 20B View FIG ) with no distinct sexual modifications, ischium with straight sternal margin. Pleopod 1 ( Fig. 20C View FIG ) 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 View FIG ) 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 View FIG .

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).