Ioanella mimon (Fain, 1973)

Herrera-Mares, Angel, Guzman-Cornejo, Carmen, Leon-Paniagua, Livia & Rivas, Gerardo, 2017, Myobiid mites (Trombidiformes, Myobiidae) of the golden bat Mimoncozumelae from Mexico. Description of the male and tritonymph of Ioanellamimon and new records of Eudusbabekiamimon, ZooKeys 658, pp. 1-8 : 2-6

Ioanella mimon (Fain, 1973) Figs 2, 3, 4

Material examined.

7 TN, 3 ♀, ex Mimon cozumelae , Oquedad 1, carretera Santa Elena-Loltún Km 56, Yucatán, México (LAFC-A03); 4 TN, 3 ♀, 2♂, same data, except Oquedad 2 (LAFC-A04).

Description.

Male (Based on 2 males). Body length 225 (223-228); wide 139 (125-152). Body 1.6 larger than wide. Dorsal idiosoma (Fig. 2A). With a reduce number of setae. All dorsal setae slightly toothed except setae vi; vi at level of anterior end of genital plate; setae sci cylindrical, and situated close to the genital aperture. Setae sce cylindrical, with the base broad and becoming narrower to the tip and with the tip flat. Setae c2 not distinctly inflated basally; sci situated at 15-16 behind the sce; setae f2 absent as female; setae e1 minute. Length of setae: ve 21 (18-25), sce 28 (26-31), sci 17 (14-17), c2 20 (17-22). Distances between bases of setae: vi-vi: 30 (29-31), ve-ve: 46 (45-47), sce-sce: 53 (52-54), sci-sci: 23 (21-26), c2-c2: 79 (76-82), ve-sce 28 (24-29), sce-c2 68 (65-68), vi-sci 31 (29-33). Genital plate rounded with an anterior projection (Fig. 2A). Penis 90 (90-91) long. Ventral idiosoma (Fig. 2B). All coxal setae filiform.

Gnathosoma. Normally developed, with a pair of ventral flat and retrorse processes as in the female (Fain, 1978) but slightly less pronounced.

Legs. Tibia and tarsus I fused forming a small complex devoid of apical claws (Fig. 3). Genua I large, strongly oblique with a ventral clasping process recurved inwards and with 3 setae (Fig. 3). Trochanter I very broad, with the anterior end strongly expanded (Fig. 3). Legs II–IV narrow, ending in two short, subequal, and slightly curved claws. Setation for legs II–IV: tarsi 6-6-6, tibiae 6-6-6, genua 5-3-4, femora 5-3-2, trochanters 3-2-2. Tibia II–IV with a long and sinuous seta and a little thorn-like seta.

Description.

Trytonymph (Based on 4 tritonymphs). Dorsal idiosoma. Posterior region of dorsum with 3 pairs of cylindrical and toothed setae: e1 14 (11-18), e2 15 (14-18), f1 14 (12-15) (Fig. 4A). Setae ve, vi, sce, sci, c1, d1, d2 absent. Ventral idiosoma. Setae h1 very thin. Setae 2a, 3a, 4a present and minute. Setae 1b and 1c shell-shaped, setae 1a very thin (Fig. 4B). Legs. Tarsi II–IV with 2-1-1 claws. Legs I unequal in shape (Fig. 4B); clasping process with internal striations (Fig. 4B). Setation for legs II–IV: Tarsi 6-6-6, tibiae 5-4-3, genua+femur 2-0-0, trochanters 0-0-0. Number of shell-shaped setae on legs I as follows: 2-0-1-2-1 (Tibia+Tarsus) (Fig. 4B).

Remarks.

The male described in this study was determined as part of the genus Ioanella by the presence of legs I with the tibia and tarsus fused forming a small complex devoided of apical claws, legs II–IV with two claws, vi and sci thin and short, all intercoxal setae very short and the lacking of f2 ( Fain 1978). The tritonymph was characterized by the presence of legs I unequal in shape and legs II–IV with 2-1-1 claws ( Fain 1978).

The identification of males and tritonymphs as Ioanella mimon was done correlating the presence of females on the same analyzed bats considering that myobiids exhibit high specificity to their hosts ( Fain 1994).

Comparing our male specimens with the female described by Fain (1973), the only differences observed were in relation to femur and genua III due to we reported three setae instead of two and three setae instead of four, respectively.

This work represents the first description of a male of the genus Ioanella , and the second that describes a tritonymph for the genus; previously Fain (1973) described the tritonymph of Ioanella chrotopterus (Fain, 1973).

Eudusbabekia mimon and Ioanella mimon are two species of myobiids recorded originally parasitizing to Mimon bennettii , in this work both species are referred for the first time in association with Mimon cozumelae , species formerly included as subspecies of Mimon bennettii ( Ortega and Arita 1997, Villa-Ramírez 1967, Hall 1981), but considered by McCarthy (1987) and Wilson and Reeder (2005), as valid species.

Recent studies suggest that there is no sufficient morphological evidence to maintain Mimon cozumelae in a specific level ( Gregorin et al. 2008; Hoppe and Ditchfield 2015).

On the other hand, Hurtado and Pacheco (2014) suggested that the genus Mimon is not a monophyletic taxon. They proposed to elevate to a genus category the two subgenera ( Mimon and Anthorhina ) referred by Gardner and Patton (1972). In accordance with Hurtado and Pacheco (2014), the genus Mimon must include to Mimon bennettii and Mimon cozumelae , and the genus Gardnerycteris (= Anthorhina ) to Gardnerycteris crenulatum ( É. Geoffroy, 1803) and Gardnerycteris koepckeae (Gardner and Patton, 1972). In this context, Eudusbabekia mimon and Ioanella mimon will be associated with the bat species of the genus Mimon , while Eudusbabekia anthorhinae Dúsbabek and Lukoschus, 1974 and Ioanella martae Dúsbabek and Lukoschus, 1973 to the species of the genus Gardnerycteris .

Considering of degree of specificity of myobiid mites to genera or groups of species of hosts ( Fain 1994), the referred association could support the Hurtado and Pacheco´s proposal.

Distribution.

Guyana (Bartica), Mexico (Yucatan).