Typhlarmadillidium occidentale, 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 : 208

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.3810269
persistent identifier	https://treatment.plazi.org/id/78E1A6C8-9D88-483F-87C1-F33FD25FA02E
taxon LSID	lsid:zoobank.org:act:78E1A6C8-9D88-483F-87C1-F33FD25FA02E
treatment provided by	Felipe
scientific name	Typhlarmadillidium occidentale
status	sp. nov.

Treatment

Typhlarmadillidium occidentale View in CoL n. sp.

( Figs 9-11 View FIG View FIG View FIG , 21D View FIG )

urn:lsid:zoobank.org:act:78E1A6C8-9D88-483F-87C1-F33FD25FA02E

TYPE MATERIAL. — Holotype. ♂ Monte Pisano , Grotta del Cane di Uliveto, 137 T/PI, 43°42’09”N, 10°31’14”E, Caprona, Uliveto Terme, Prov. Pisa, leg. S. Taiti, G. A. Gruber and P. Maestrini, 3.II.2007 ( MZUF 9670 ) GoogleMaps . Paratypes. 1 ♂, 7 ♀, same data as holotype ( MZUF 9670 ); GoogleMaps 5 ♂, 3♀, Monte Pisano , Buca della Croce di Agnano N. 2, 78 T/PI, 43°44’09”N, 10°28’25”E, Agnano , Prov. Pisa, leg. S. Taiti, 12.X.2011 ( MZUF 9671 ); GoogleMaps 2 ♂, 10 ♀, same locality, leg. S. Taiti and F. Stoch, 10.IX.2011 ( MZUF 9672 ); GoogleMaps 2 ♀, same data ( MNHN-IU- 2017-1438 ); GoogleMaps 1 ♀, Monti d’Oltreserchio, Grotta della Spoletta, 1431 T/PI, 43°47’44”N, 10°23’35”E, Vecchiano, Prov. Pisa, leg. S. Taiti, 25.I.2008 ( MZUF 9673 ) GoogleMaps .

DIAGNOSIS. — A blind, colourless species of Typhlarmadillidium characterized by the pereonite 1 with postero-lateral corner slightly sinuous, telson with broadly rounded apex, uropod exopod shorter than telson, male pleopod 1 endopod with triangular apical part bent outwards and exopod with sinuous outer margin.

ETYMOLOGY. — Latin: occidentalis = western. The name refers to the most western distribution of the species within the genus.

DESCRIPTION

Maximum length: ♂, 8.5 mm; ♀, 9.5 mm. Body colourless, strongly convex, able to roll up into a perfect ball ( Fig. 9A View FIG ). Back smooth with sparse small triangular scale-setae ( Fig. 9B View FIG ); one line of noduli laterales per side on pereonites, more or less at the same distance from the lateral margin ( Fig. 9A View FIG ). Cephalon ( Fig. 9C, D View FIG ) with a V-shaped scutellum clearly opened dorsally and depressed, antennary lobes small, eyes absent. Pereonite 1 ( Fig. 9E, F View FIG ) with posterior margin slightly concave, postero-lateral corner slightly sinuous with no schisma, small rounded tooth on ventral surface. Pereonite 2 ( Fig. 9G View FIG ) and 3 with a small ventral rounded tooth. Telson ( Fig. 9H View FIG ) subtriangular, longer than wide, with broadly rounded apex. Antennula ( Fig. 9I View FIG ) of three articles, second article much shorter than first and third, third article with pointed apex and subapical row of seven aestethacs. Antenna ( Fig. 9J View FIG ) with fifth article of peduncle slightly longer than flagellum, second flagellar article about three times as long as first, five rows of 1-3 aesthetascs each on second article. Mandibles ( Fig. 10A, B View FIG ) with molar penicil semidichotomized, 2 + 3 free penicils on the left and 1 + 3 on the right mandible. Maxillula ( Fig. 10C View FIG ) outer branch with 4+ 6 (4 cleft) teeth, inner branch with two penicils. Maxilla ( Fig. 10D View FIG ) with bilobed and setose apex, outer lobe twice as wide as inner lobe. Maxilliped ( Fig. 10E View FIG ) endite with two triangular terminal spines, one subterminal strong seta and bilobed distal-medial corner. Pleopods 1 and 2 ( Fig. 11D, E View FIG ) with monospiracular covered lungs. Uropod ( Fig. 10F View FIG ) protopod slightly longer than exopod, exopod twice as long as wide, endopod much longer than exopod.

Male

Pereopod 1 ( Fig. 11A View FIG ) carpus with row of strong setae on sternal margin. Pereopod 7 ( Fig. 11B View FIG ) with no distinct sexual modifications, ischium with straight sternal margin. Genital papilla as in Fig. 11C View FIG . Pleopod 1 ( Fig. 11D View FIG ) exopod wider than long with sinuous outer margin and broadly rounded apex; endopod with triangular apical part slightly bent outwards bearing row of short setae. Pleopod 2 ( Fig. 11E View FIG ) exopod slightly shorter than endopod. Pleopod 3-5 exopods as in Fig. 11 View FIG F-H.

REMARKS

The new species is included in the genus Typhlarmadillidium since it has a V-shaped scutellum clearly opened dorsally, small antennary lobes, pereonite 1 with no schisma, telson triangular, and uropod much longer than wide.

To date, the genus Typhlarmadillidium included three species: T. kratochvili (Frankenberger, 1938) from Croatia, T. trebinjanum (Verhoeff, 1900) from Croatia, Herzegovina and Montenegro, and T. ruffoi Ferrara & Taiti, 1996 from north-eastern Italy. The new species considerably enlarges the genus distribution towards the West. The new species is readily distinguished from T. kratochvili and T. trebinjanum in the uropodal exopods not surpassing the apex of telson and in the shape of the telson with a broader distal part; from T. trebinjanum also in the male pereopod 7 ischium with straight instead of concave sternal margin (compare Fig. 11B View FIG and Strouhal 1939: fig. 12); from T. ruffoi in the telson being longer than wide, the uropodal exopod being comparatively longer, the male pleopod 1 exopod with sinuous outer margin and endopod with apical part pointed and bent outwards instead of rounded (compare Ferrara & Taiti 1996).