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Minibiotus gumersindoi, Guil, Noemi & Guidetti, Roberto, 2005

Guil, Noemi & Guidetti, Roberto, 2005, A new species of Tardigrada (Eutardigrada: Macrobiotidae) from Iberian Peninsula and Canary Islands (Spain), Zootaxa 889, pp. 1-11 : 3-8

publication ID

 https://doi.org/ 10.5281/zenodo.170921

DOI

 https://doi.org/10.5281/zenodo.5587462

persistent identifier

https://treatment.plazi.org/id/0399373A-4C24-FFFD-FEA5-7217E410FE2B

treatment provided by

Plazi

scientific name

 Minibiotus gumersindoi
status

sp. nov.

Minibiotus gumersindoi View in CoL n. sp.

Diagnosis

Cuticle with transversal bands of large and round pores, a very large round pore close to the end of each leg; granulation on legs not visible; three round macroplacoids of the same size and a solid and distinct microplacoid; slender claws with short but evident accessory points and smooth lunules.

Description

Body length 162.0 m ( Tables 1–2 View TABLE 1 View TABLE 2 ), colourless. Eyes not visible, probably lost due to mounting medium action (see Remarks). Cuticle with transverse bands of round and large pores around the body ( Figure 1 View FIGURE 1 ). Pores larger on the head region. A very large and round pore present close to the claws on external side of all legs (pore diameter = 2.0% of body length; Figures 1 View FIGURE 1 , 2 View FIGURE 2 A; Tables 1–2 View TABLE 1 View TABLE 2 ). In some legs, three or five smaller pores forming a triangle or pentagon figure present over the large round pore ( Figure 2 View FIGURE 2 A). Buccal armature and transversal ridges not visible at light microscope. Buccal tube long (19.8 µm) and narrow (1.2 µm) ( Tables 1–2 View TABLE 1 View TABLE 2 ) and with double curvature ( Figure 2 View FIGURE 2 B). Stylet support inserted at 55.0% of buccal tube length ( Tables 1–2 View TABLE 1 View TABLE 2 ). Pharyngeal bulb round ( Tables 1–2 View TABLE 1 View TABLE 2 ) with large, round apophyses, three round macroplacoids of similar size ( Figure 2 View FIGURE 2 B) and solid, and small but distinct microplacoid ( Figures 1 View FIGURE 1 , 2 View FIGURE 2 B). Macroplacoid row: 5.4 m (27.5% of buccal tube length; Table 1 View TABLE 1 ). Claws slender (main branch of fourth pair of claws 4.9 m long) with long secondary branches ( Figure 2 View FIGURE 2 C). Short but well developed accessory points on main branches present ( Figure 2 View FIGURE 2 C). Lunules small, smooth and thin in all claws ( Figure 2 View FIGURE 2 C). Eggs unknown.

Etymology

The species is named in memory of Mr. Gumersindo Guil Valverde, Dr. Guil’s grandfather.

Type locality

Moss on rock, in oak forest at 1098 m a.s.l. in Bustarviejo Valley (Madrid, Spain; UTM 30T0437017­4521195).

Repositories

The holotype and paratype are deposited in the non­insect invertebrate collection of National Museum of Natural Science of Madrid (Consejo Superior de Investigaciones Científicas, CSIC) (collection number: 23.00/1).

Remarks

Cuticle transverse bands are not well identifiable in the paratype and in some specimens of west Madrid and Canary Islands. Eyes are visible in specimens of Minibiotus gumersindoi n. sp. from west Madrid and Canary Islands.

Differential diagnosis

Minibiotus gumersindoi n. sp. differs from all the other species of the genus for the presence of a very large pore in the external distal part of the leg and for a set of large pores in the proximal part of the leg. In particular Minibiotus gumersindoi n. sp. differs from other similar species ( Table 3 View TABLE 3 ) for:

­ the presence of large and almost regular rounded pores: irregular in M. bisoctus (Horning, Schuster & Grigarick) , M. ethelae Claxton , M. furcatus (Ehrenberg) , M. stuckenbergi (Dastych, Ryan & Watkins) , and M. vinciguerrae Binda & Pilato , and small in M. keppelensis Claxton , M. poricinctus Claxton and M. ramazzottii Binda & Pilato ; ­ the absence of granulation on legs: present in M. bisoctus (Horning, Schuster & Grigarick) , M. keppelensis Claxton , M. poricinctus Claxton , M. stuckenbergi (Dastych, Ryan & Watkins) , M. vinciguerrae Binda & Pilato , and M. weinerorum (Dastych) ;

­ the absence of cuticle thickened in caudal region: present in M. ethelae Claxton ;

­ the presence of three macroplacoids; two in M. scopulus Claxton ;

­ the presence of smooth lunules on the fourth leg pair: with teeth in M. stuckenbergi (Dastych, Ryan & Watkins) .

Habitat

In Cercedilla, specimens were found in rock mosses in a xerophilus landscape (xerophilus bushes: thyme, rosemary and broom) at 1228 m a.s.l.. In Embalse de la Jarosa the new species has been found in rock mosses in a pine forest (of Pinus nigra Arnold ) at 1107 m a.s.l. and in the Canary Islands in rock mosses in a pine forest (of Pinus canariensis Smith ) at 1460 m a.s.l.

Population variability

We consider the specimens collected in the different localities belonging to the same species due to the well defined morphological characters shared by these specimens. Due to the relatively small number of specimens collected in the different localities, we did not performed a statistical analyses of the morphometric data. Anyway, we report the morphometric differences identified in the populations.

Morphometric differences appear when the Madrid populations ( Table 1 View TABLE 1 from M1 to M2, type locality population, and from M3 to M7, west Madrid populations) and the Caldera de Taburiente (Canary Islands) population ( Table 1 View TABLE 1 from CT1 to CT9) are compared.

Body length, stylet support insertion length and secondary branch of claws in fourth pair of legs are larger in the Caldera de Taburiente (Canary Islands) population than in the Madrid (type locality) and the west Madrid populations ( Table 2 View TABLE 2 ), while main branch of claws in fourth pair of legs is larger in the Madrid populations than in the Caldera de Taburiente (Canary Islands) population ( Table 2 View TABLE 2 ). The Caldera de Taburiente population (Canary Islands) (from pine forest) has the bigger distal leg pore diameters, followed by the west Madrid population (from xerophilous and pine forest) and the type locality population (from oak forest) ( Table 2 View TABLE 2 ). Buccal tube length and body pores diameters are larger in the type locality population than in the west Madrid and the Caldera de Taburiente (Canary Islands) populations, where their values are similar. Body length and pharyngeal width are shorter in the type locality population than in the others ( Table 2 View TABLE 2 ).

Other species of tardigrades

There is no other tardigrade species that occurs always in all the four localities where we have found Minibiotus gumersindoi n. sp. Echiniscus trisetosus Cuénot is present in three of the four localities (Bustarviejo valley, Cercedilla and Caldera de Taburiente). We present other tardigrade species found together with the new species in Table 4 View TABLE 4 , where information is given on which species are new records for Madrid, Canary Islands and/or the Iberian Peninsula.

TABLE 1: Measurements (m) and pt ratio relation per specimen of Minibiotus gumersindoi n. sp. M 1 ­ M 2 = Bustarviejo valley (Madrid; type locality) specimens; M 1 = HOLOTYPE; M 2 = Paratype; M 3 ­ M 5 = Cercedilla (Madrid) specimens. M 6 ­ M 7 = Embalse de la Jarosa (Madrid) specimens; CT 1 ­ CT 9 = Caldera de Taburiente (Canary Islands) specimens. Abbreviations used in this and in the following Tables: BT = buccal tube; PH = pharyngeal bulb; PR = placoid row; MPR = macroplacoid row; M = macroplacoid; SSI = stylet support insertion; PI = first pair of legs; PII = second pair of legs; PIII = third pair of legs; PIV = fourth pair of legs; MB = main branch claw; SB = secondary branch claw; MD = medium diameter; ND = No data; L­V = latero­ventral position of the specimen in the slide; L = lateral position of the specimen in the slide; V = ventral position of the specimen in the slide; D = dorsal position of the specimen in the slide.

Characters M1 M2 M3 M4 M5 M6 M7 CT1 CT2 CT3 CT4 CT5 CT6 CT7 CT8 CT9
Body length 162.0 162.0 153.0 ND ND 211.5 ND 162.0 153.0 189.0 ND 162.0 184.5 144.0 198.0 198.0
BT length 19.8 20.7 ND 19.8 ND 19.8 20.3 19.8 17.8 ND ND ND 19.8 ND 22.7 19.8
BT width 1.2 1.0 1.0 1.5 1.0 1.0 1.0 1.2 1.0 1.0 ND 1.0 1.0 1.0 1.2 1.5
pt BT width 6.3 4.8 ND 7.5 ND 5.0 4.9 6.3 5.6 ND ND ND 5.0 ND 5.4 7.5
PH width ND 15.3 ND ND ND 16.8 17.3 ND 13.8 15.3 ND 14.3 15.8 13.8 17.8 15.8
pt PH width ND 73.8 ND ND ND 85.0 85.4 ND 77.8 ND ND ND 80.0 ND 78.3 80.0
PR length 6.4 6.9 5.9 6.4 5.9 6.4 6.9 ND 6.4 5.9 ND 6.4 6.9 5.9 6.9 6.4
pt PR lenght 32.5 33.3 ND 32.5 ND 32.5 34.1 ND 36.1 ND ND ND 35.0 ND 30.4 32.5
MPR length 5.4 5.9 4.9 5.4 4.9 5.4 5.9 ND 5.4 4.9 ND 4.9 5.9 4.9 5.9 5.4
pt MPR lenght 27.5 28.6 ND 27.5 ND 27.5 29.3 ND 30.6 ND ND ND 30.0 ND 26.1 27.5
M1 length 1.0 1.0 1.0 1.0 1.0 1.0 1.0 ND 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0
M2 length 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0
M3 length 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0
Microplacoid 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5
SSI length 10.9 10.9 ND 11.4 ND 9.9 10.4 ND 9.9 ND ND ND 10.4 ND 12.8 10.9
pt SSI length 55.0 52.4 ND 57.5 ND 50.0 51.2 0.0 55.6 ND ND ND 52.5 ND 56.5 55.0
MBPI length 4.0 4.0 4.0 4.0 ND 4.0 4.4 4.0 4.0 4.4 ND ND 4.0 4.0 4.0 4.4
SBPI length 3.0 3.0 2.5 2.5 ND 2.5 3.0 2.5 2.5 3.0 ND ND 3.5 2.5 2.5 3.0
MBPII length 4.0 4.0 ND ND ND 4.4 4.4 4.0 4.0 4.4 4.9 4.4 4.0 4.0 4.4 ND
SBPII length 3.0 3.0 ND ND ND 3.0 3.0 2.5 2.5 3.0 3.0 3.0 3.0 2.5 3.0 ND
MBPIII length 4.0 4.0 4.4 ND ND ND ND ND 4.4 4.4 4.9 4.9 4.4 4.4 ND ND
SBPIII length 3.0 3.0 3.0 ND ND ND ND ND 3.0 3.0 3.5 3.5 3.0 3.0 ND ND
MBPIV length 4.9 5.4 5.4 4.9 ND ND ND 4.9 4.9 5.9 ND 5.4 ND ND ND ND
SBPIV length 3.5 4.0 3.0 3.5 ND ND ND 4.4 4.4 4.9 ND 4.0 ND ND ND ND
MD Distal leg pores 3.2 2.7 ND 2.7 3.0 2.7 3.0 3.0 2.7 ND 3.7 2.7 3.0 2.2 2.7 2.7
MD Body pores 1.5 2.0 1.5 1.5 1.5 1.5 1.5 1.5 1.5 ND 1.5 1.5 1.5 1.2 1.5 1.5
Specimen position L­V L V L V L L L L D L L­V L V L L

TABLE 3: Differences and similarities between Minibiotus gumersindoi n. sp. and other similar species of the genus. No = number; PIV = fourth pair of legs; Granulation = granulation on legs; Thickened = cuticle thickened in caudal region (see Claxton 1998)

Species Pore shapes No Macropla­ coids Lunules PIV Granula­ tion Thickened
M. gumersindoi n.sp. Big and round 3 Smooth Absent Absent
M. keppelensis Small and round; 10 rows 3 Smooth Present Absent
M. poricinctus Small and round; 8 rows 3 Smooth Present Absent
M. ramazzottii Small and round 3 Smooth Present Absent
M. scopulus Round to elliptical; 9 rows 2 Smooth Absent Absent
M. stuckenbergi Irregular 3 With teeth Present Absent
M. ethelae Irregular 3 Smooth Absent Present
M. bisoctus Irregular 3 Smooth Present Absent
M. furcatus Irregular 3 Smooth Present Absent
M. vicenguerrae Irregular 3 Smooth Present Absent

TABLE 2: Measurements (µm) of Minibiotus gumersindoi n. sp. in all populations: in Madrid (the type locality and the west Madrid populations) and in the Caldera de Taburiente (Canary Islands) populations. Measurements made only with specimens in lateral position. No = number of valid specimens; SD = Standard Deviation.

Characters MADRID (type locality) WEST MADRID CANARY ISLANDS ALL POPULA­ TIONS
  No   SD RANGE No   SD RANGE No   SD RANGE No SD RANGE
Body length 2 162.0 0.0 162.0 1 175.5 0.0 175.5 5 179.1 20.7 153.0– 198.0 8 155.2 37.3 153.0– 211.5
BT length 2 20.3 0.7 19.8– 20.7 3 19.5 0.3 19.8– 20.2 5 20.0 1.8 17.8– 22.7 10 20.0 1.2 17.8–22.7
BT width 2 1.1 0.2 1.0 – 1.2 3 1.1 0.3 1.0–1.5 5 1.2 0.2 1.0–1.5 10 1.1 0.2 1.0–1.5
PH width 1 15.3 0.0 15.3 2 16.0 0.3 16.8– 17.2 4 15.8 1.6 13.8– 17.8 7 15.6 1.4 13.8–17.8
PR length 2 6.7 0.3 6.4–6.9 3 6.5 0.3 6.4–6.9 4 6.7 0.3 6.4–6.9 9 6.4 0.4 6.4–6.9
MPR length 2 5.7 0.3 5.4–5.9 3 5.6 0.3 5.4–6.0 4 5.7 0.3 5.4–5.9 9 5.4 0.4 5.4–5.9
M1 length 2 1.0 0.0 1.0 3 1.0 0.0 1.0 5 1.0 0.0 1.0 10 1.0 0.0 1.0
M2 length 2 1.0 0.0 1.0 3 1.0 0.0 1.0 6 1.0 0.0 1.0 11 1.0 0.0 1.0
M3 length 2 1.0 0.0 1.0 3 1.0 0.0 1.0 6 1.0 0.0 1.0 11 1.0 0.0 1.0
Microplacoid 2 0.5 0.0 0.5 3 0.5 0.0 0.5 6 0.5 0.0 0.5 11 0.5 0.0 0.5
SSI length 2 10.9 0.0 10.9 3 10.4 0.8 9.9–11.4 4 11.0 1.3 9.9–12.8 9 10.8 0.9 9.9–12.8
MBPI length 2 4.0 0.0 4.0 3 4.1 0.3 4.0–4.5 5 4.1 0.2 4.0–4.5 10 4.1 0.2 4.0–4.5
SBPI length 2 3.0 0.0 3.0 3 2.6 0.3 2.5–3.0 5 2.8 0.4 2.5–3.5 10 2.7 0.3 2.5–3.5
MBPII length 2 4.0 0.0 4.0 2 4.2 0.0 4.2 5 4.2 0.4 4.0–4.9 9 4.2 0.3 4.0–4.9
SBPII length 2 3.0 0.0 3.0 2 2.7 0.0 2.7 5 2.8 0.3 2.5–3.0 9 2.8 0.2 2.5–3.0
MBPIII length 2 4.0 0.0 4.0 0 ND ND ND 3 4.6 0.3 4.5–5.0 5 4.4 0.3 4.0–4.9
SBPIII length 2 3.0 0.0 3.0 0 ND ND ND 3 3.1 0.3 3.0–3.5 5 3.1 0.2 3.0–3.5
MBPIV length 2 5.2 0.3 4.9–5.4 1 4.9 0.0 4.9 2 4.9 0.0 4.9 5 5.2 0.4 4.9–5.4
SBPIV length 2 3.7 0.3 3.5–4.0 1 4.1 0.0 4.1 2 4.4 0.0 4.4 5 4.0 0.6 3.5–4.5
MD Distal leg pores 2 3.0 0.3 2.7 – 3.2 3 2.8 0.1 2.7–3.0 6 3.0 0.4 2.7–3.7 11 2.9 0.3 2.7–3.7
MD Body pores 2 2.0 0.0 2.0 3 1.5 0.0 1.5 6 1.5 0.0 1.5 11 1.5 0.1 1.5–2.0

Kingdom

Animalia

Phylum

Tardigrada

Class

Eutardigrada

Order

Parachela

Family

Macrobiotidae

Genus

Minibiotus

Specimens

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