Minibiotus poricinctus, Minibiotus, 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

publication ID

http://doi.org/ 10.3853/j.0067-1975.50.1998.1276

publication LSID

lsid:zoobank.org:pub:4C7B3B68-1D65-4506-8B7F-08C2CF4C55AC

DOI

http://doi.org/10.5281/zenodo.4658326

persistent identifier

http://treatment.plazi.org/id/59798784-0D5C-3628-149B-1476ADA5801F

treatment provided by

Felipe

scientific name

Minibiotus poricinctus Minibiotus
status

n.sp.

Minibiotus poricinctus  n.sp.

Figs. 4, 18c; 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 rockGoogleMaps  . PARATYPES (10 specimens, 3 eggs in AM [ AM KS41586-41595]; 50 specimens, 5 eggs in SKC) same data as holotypeGoogleMaps  .

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.

Remarks. The species is superficially very similar to M. intermedius  and M. taiti  but differs from them by the presence of bands of pores in the cuticle.

Minibiotus  f/oriparus n.sp.

Figs. 5View Figure 5, 18dView Figure 18; Table 4

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.

Table 3. Measurements (in flm) of adults of Minibiotus poricinctus n.sp.

Character No. Range Mean SD SE Holotype
bodylength 20 174-290 240.3 30.0 6.7 270
BTlength 20 20.5-28.1 24.7 1.6 0.4 26.0
BTwidth 20 1.5-2.2 1.9 0.2 0.04 2.1
SIlength 20 12.2-16.8 14.7 1.0 0.2 15.4
VSlength 20 7.6-10.3 8.8 0.6 0.1 9.2
PRlength 20 7.0-10.0 8.7 0.7 0.2 8.7
MPRlength 20 6.0-8.9 7.6 0.7 0.2 7.6
m 1 20 1.6-2.5 2.1 0.2 0.04 2.2
m 2 20 1.4-2.4 1.9 0.3 0.1 1.9
m 3 20 1.4-2.4 1.9 0.3 0.1 1.9
microplacoid 20 0.5-1.0 0.6 0.2 0.1 0.5
PHlength 15 20.0-27.0 24.0 1.9 0.4 25.0
PHwidth 15 20.0-26.0 22.7 1.8 0.4 24.0
clawI 20 4.3-6.2 5.6 0.5 0.1 6.0
clawII-III 20 5.1-6.8 6.2 0.4 0.1 6.5
clawIV 20 5.7-7.6 6.8 0.5 0.1 7.0

Table 4. Measurements (in Ilm) of adults of Minibiotusj70riparus n.sp.

Character No. Range Mean SD SE Holotype
bodylength 19 170-420 300.2 64.9 14.9 285
BTlength 19 20.0-33.5 27.1 3.6 0.8 27.6
BTwidth 19 1.6-2.7 2.1 0.4 0.1 2.1
SIlength 19 13.0-21.6 17.5 2.4 0.6 17.8
VSlength 17 9.2-16.2 12.5 1.7 0.4 13.0
PRlength 19 7.6-14.1 10.7 1.9 0.4 11.4
MPRlength 19 6.5-11.9 9.0 1.6 0.4 9.7
m 1 19 1.9-3.8 2.7 0.5 0.1 2.7
m 2 19 1.6-3.2 2.3 0.4 0.1 2.4
m 3 19 1.6-3.8 2.6 0.5 0.1 2.7
microplacoid 19 0.4-1.5 0.8 0.3 0.1 0.8
PHlength 17 21.0-32.0 26.9 3.4 0.8 27.0
PHwidth 15 22.0-38.0 27.5 5.0 1.3 24.0
clawI 19 5.4-10.3 7.8 1.4 0.3 7.6
clawII-III 19 6.0-10.8 8.3 1.3 0.3 8.1
clawIV 19 6.5-11.9 9.2 1.4 0.3 9.2
AM

Australian Museum