Chileoniscus armadillidioides, Schmidt, 2007
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publication ID |
https://doi.org/ 10.1111/j.1096-3642.2007.00286.x |
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persistent identifier |
https://treatment.plazi.org/id/03858799-4277-FFA6-981F-7F57ADD8F90D |
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treatment provided by |
Felipe |
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scientific name |
Chileoniscus armadillidioides |
| status |
sp. nov. |
CHILEONISCUS ARMADILLIDIOIDES View in CoL SP. NOV.
Material examined
Type specimens: One ♂ holotype, two ♀ m, ten immature ♀, four ♂ paratypes ( Chile, X Reg. Prov. Chiloé, Cucao, 30 km south-west of Castro, altitude 30 m, temperate rainforest, leg. Agosti and Burckhardt, 4–6 January 1991, #29a, MZUF) .
Other samples: One ♀ ( Chile, X Reg. Prov. Chiloé, PN Chiloé, Rancho Grande near Cuaco, altitude 300– 600 m, Fitzroya forest, leg. Agosti and Burckhardt, 4 January 1991, #30a, MZUF) ; three ♂ ( Chile, X Reg. Prov. Chiloé, Rancho Grande near Cuaco, 42°33′ S, 74°02′ W, altitude 250–400 m, leg. Agosti and Burckhardt, 29 December 1992, #35b, MZUF) GoogleMaps ; one ♀ m, three ♀ /immature ♀, four ♂ ( Chile, X Reg. Prov. Chiloé, Cucao, 30 km south-west of Castro, 42°37′ S, 74°08′ W, altitude 10–70 m, leg. Agosti and Burckhardt, 28 December 1992 to 1 January 1993, #34b, MZUF) GoogleMaps .
Description ( Figs 240–246 View Figure 240 View Figure 241 View Figure 242 View Figure 243 View Figure 244 View Figure 245 View Figure 246 )
Male 4.1 × 1.8 mm (cephalothorax width 1.03 mm) to 4.45 × 1.95 mm (cephalothorax width 1.10 mm). Coloration marmorate, with brown and pale. Cephalothorax with vertex and frons separated only by a shallow furrow. While conglobated, the second antennae are held in furrows, between which there is a ‘frontal triangle’. Distinct antennal lobes present. Eyes composed of 11 or 12 ommatidia. Tergites smooth, with hair-like scale setae and large noduli laterales. Noduli 2 and 3, and 5 and 6, are approximately at the base of the coxal plates, 1 and 4 are in a more mesal position, and on tergite 7 there are two pairs, in lateral and mesal positions. Distance to posterior margin decreases from 1 to 7, the first being at the midlength of its tergite, and the seventh near the posterior margin. One male specimen with six additional noduli laterales between the mesal pair of noduli of seventh tergite. This is only an individual variation. All coxal plates simple; 2, 3 and 5, and even more 4, are short, due to conglobation ability. Pleotelson triangular, with rounded tip reaching the body outline. The space between pleotelson and the fifth pleon-epimera filled mainly by platelike uropod exopodites.
First antenna three-jointed, second article shortest, distal article bearing two apical and one or two subapical aesthetascs. Second antenna about as long as the seventh pereiopod. Flagellum two-jointed, distal article five times as long as proximal article, bearing a short apical cone; a single pair of free lateral sensilla could not be found. Mandibles: lacinia mobilis of left mandible with three cusps, that of right mandible with some small, sharp cusps; hairy lobe on left mandible with one penicil, and on right mandible with two penicils. Pars molaris represented by a tuft of numerous hairy setae. Between hairy lobe and pars molaris, one hairy seta. First maxilla lateral endite on the distal margin with lateral group of four stout tooth-setae, one small, short seta and a very small, triangular lobe, and mesal group of six more slender setae, at most one of them apically indistinctly cleft. Distal quarter of lateral margin fringed with hairs (pectinate scales). Mesal endite with no laterodistal corner; the whole width of the distal margin is occupied by two equal penicils. Second maxilla distally bilobate, mesal lobe narrower and bearing a field of sensilla. Two sensilla between lobes. Maxilliped base with scale setae and, in proximal part, also with scales. Maxilliped palp proximal article with two large setae, distal articles fused except for an indistinct suture, on mesal margin with two tufts of one large and one or two smaller setae, both on small sockets, at apex with a tuft of numerous small setae, on lateral margin with two single, subapical setae and a pair of one broad and one slen- der seta. Endite approximately rectangular, with small lobe near the outer corner and one large seta on the caudal face.
Pereiopods 1–5 slender, pereiopods 6 and 7 stouter. All pereiopods with scale setae and large ventral setae. Male pereiopods 1 and 2 with number of ventral setae increased on merus and carpus. First pereiopod with longitudinal brush (scale-field) on frontal face of carpus and group of scales on ventrofrontal part of proximal half of propodus. Dactyli with long and slen- der inner claw projecting beyond outer claw, ungual seta also longer than outer claw. Dactylar seta with knife-shaped, enlarged tip. One small seta beside ungual seta, one larger seta each on frontal and caudal faces, and few (four?) aestetasc-like setae beside dactylar seta. Male pereiopod 7 on caudal face of carpus with shallow concavity.
Pleopod exopodites 1–5 without obvious lungs or respiratory fields, with 2–5 simple marginal setae in subapical or apical position. Male pleopod 1 exopodite longer than broad, roughly triangular, with slightly constricted distal lobe, which bears marginal setae. Male endopodite 1 slender, distally downcurved. Approximately 20 small setae in a row along spermatic furrow. Male pleopod 2 exopodite long, its hairy inner margin as long as the endopodite. Pleopod 5 exopodite on dorsal (caudal) face with field of pectinate scales in distal third. These are not arranged in distinct rows. Sympodites 2–5 on lateral portion with one small seta each.
Uropod endopodite laterally flattened, as long as the sympodite, on which it inserts in a basal position. Uropod exopodite plate-like, about as long as wide, rounded, with a number of large gland pores on dorsal face.
Probable apomorphies of Ch. armadillidioides are (compared with Ch. marmoratus ):
1. frontal shield with excavate upper corners, which leave the eyes uncovered in frontal view (eyes partly covered by the frontal shield)
2. nodulus of tergite 4 in a more medial position (in same position as noduli 1–3 and 5 and 6)
3. male pereiopod 7 with concavity on caudal face of carpus (slight concavities on frontal face of ischium, merus and carpus)
Derivation of the name
Because of the strong superficial resemblance to the Mediterranean genus Armadillidium , the present species is named armadillidioides .
| MZUF |
Museo Zoologico La Specola, Universita di Firenze |
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.