Minibiotus poricinctus, Claxton, 1998Minibiotus, Schuster, Nelson, Grigarick & Christenberry, 1980
Claxton, Sandra K., 1998, A revision of the genus Minibiotus (Tardigrada: Macrobiotidae) with descriptions of eleven new species from Australia, Records of the Australian Museum 50 (2), pp. 125-160: 133-136
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|Minibiotus poricinctus Minibiotus|
Minibiotus poricinctus n.sp.
Figs. 4, 18c; Table 3 View Table 3
Type material. HOLOTYPE in AM ( AM KS41585): Australia, Tasmania: Mount Cameron WestAboriginal Site , 41°52'S 144°42'E, 9 January 1996, A. Moscal, moss on rock GoogleMaps . PARATYPES (10 specimens, 3 eggs in AM [ AM KS41586-41595]; 50 specimens, 5 eggs in SKC) same data as holotype GoogleMaps .
Diagnosis. Cuticle with eight bands of small round pores and granulation on all legs; three round macroplacoids ofthe same size and an indistinct microplacoid; long slender claws with short, close accessory claws and thick smooth lunules.
Description. Body length 135-277 /lm, colourless. Eye spots large in posterior position. Cuticle with eight bands of small, round (0.5 /lID) pores around the body, sparse on the ventral surface and on the outside of all legs. Fine granulation on top and both sides of legs I-Ill just above claws, also around claws on leg IV. Buccal tube narrow (7.6% of buccal tube length). Stylet supports inserted at 59.5% of buccal tube length, ventral support very short (35.8% of buccal tube length). Pharyngeal bulb almost round (24 /lm long by 22 /lm wide) containing large, triangular apophysis, three macroplacoids and a microplacoid. Macroplacoid row short (30.9% of buccal tube length); first macroplacoid slightly elongated anteriorly where it lies very close to and partly obscured by the apophysis; second and third macroplacoids round, same size as first. Microplacoid small and indistinct, lying close to third macroplacoid. Claws slender (fourth pair of claws is 27.3% of length of buccal tube) with long secondary branch and round refractive zone at base. Accessory claws short, lying close to main branch on all claws. Lunules small, smooth on first three pairs oflegs, thick and smooth on fourth pair of legs.
Eggs round, diameter without processes 49 /lm, with processes 60 /lm. 18-20 processes around circumference, 50 in hemisphere. Processes screw-like, each surrounded by a membrane, height 6.5-7 /lID, base 1.5 /lm, top 5.5 /lm, 6-8 /lm apart. Small dots visible on shell surface around each process where membrane appears to reach the surface.
Etymology. Latin, porus, masculine, hole and cinctus, Latin noun, girdle, belt.Minibiotus f/oriparus n.sp.
lYpe material. HOLOTYPE inAM ( AM KS41441): Australia, New South Wales: Camden , 34°04'S 150042'E, 120 m a.s.l., 4 April 1994, S.K. Claxton. PARATYPES (7 specimens, 5 eggs in AM [ AM KS4 l442-KS41451]; 36 specimens, 8 eggs in SKC): same data as holotype .
Diagnosis. Smooth red-purple cuticle, granulation on all legs; three round macroplacoids of same size and a distinct microplacoid; long robust claws with short accessory claws which rise high above the main branch only on the fourth pair of claws and smooth lunules.
Description. Body length 152-420 f,lm, all but the smallest specimens with red-purple cuticle, some specimens also with purple granules. Eye spots large in posterior position. Cuticle smooth. Granulation on sides and back of first three pairs of legs above claws, granulation fine and dense on fourth pair of legs. Buccal tube narrow (7.6% of buccal tube length). Stylet supports inserted at 64.4% of buccal tube length and ventral support long (46.1%). Pharyngeal bulb round (about 24!lm diameter) containing large granular apophyses, three granular macroplacoids and a microplacoid. Macroplacoid row short (33.1% of buccal tube length); macroplacoids round granules of about the same size, second macroplacoid slightly smaller than other two, third with slight caudal bulb, which curves towards the midline. Microplacoid distinct and short. Claws robust (fourth pair of claws is 34% of length of buccal tube) with small refractive zone at base and with long secondary branch. Accessory claws short and rise high above the main branch on fourth pair of claws only. Lunules small and smooth on first three pairs of legs, thick and smooth on the fourth pair of legs.
Egg colourless, round, diameter without processes 62!lm, with processes 70!lm. 20-22 processes around circumference, 60-75 in hemisphere. Processes screwshaped withflared distal end withring of9-10 pores around a central area, height 5.5-6!lm, base diameter 2-3!lID, distal disc diameter 6-7!lID. Each process surrounded by a membrane. Shell surface smooth.
Etymology. Latin, jloriparus , bearing flowers, describing the egg and its processes.
Remarks. The species is very similar to Minibiotus maculartus Pilato & Claxton, 1988 , having a smooth cuticle and granulation around all claws but differs from it by having purple coloured cuticle, smooth lunules on the claws of the fourth pair of legs and also by having very different processes on the egg.
Habitat. The species was found only in crustose and foliose lichens on the branch of a species of Eucalyptus in open woodland.
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