Mimuloria Chamberlin 1928

Hennen, Derek A. & Shelley, Rowland M., 2015, A contribution on the milliped tribe Nannariini (Polydesmida: Xystodesmidae): Revalidation of Mimuloria Chamberlin 1928; identities of Fontaria oblonga C. L. Koch 1847, and Nannaria minor Chamberlin 1918; elucidation of the tribal range; and commentaries on Nannaria Chamberlin 1918, and Oenomaea Hoffman 1964, Insecta Mundi 2015 (418), pp. 1-21 : 5-6

Genus Mimuloria Chamberlin 1928 , revalidated

Mimuloria Chamberlin 1928: 155 . Attems 1940: 490, 530. Causey 1952: 7–8; 1955: 30. Chamberlin and Hoffman 1958: 37. Jeekel 1971: 273.

Castanaria Causey 1950b: 1 . Jeekel 1971: 254.

Type-species. Of Mimuloria , M. missouriensis Chamberlin 1928 , by original designation; of Castanaria , C. depalmai Causey 1950b , by original designation. Causey (1952) placed Castanaria in synonymy under Mimuloria , which was accepted by Chamberlin and Hoffman (1958).

Diagnosis. Gonopod without solenomere; acropodite arching mediad in situ, crossing opposite member distally or near midlength and terminating over opposing coxa; tip ornamented with either variably rounded lobe or short spiniform projection on anterior surface, or narrow lobes on dorsal and ventral margins and caudally directed, subtriangular lamina extending from inner surface and carrying prostatic groove.

Components. We recognize two assemblages that are based primarily on the distal acropodital configuration and named for the dominant species.

Distribution. Northeastern Indiana and east central Tennessee to southwestern Missouri and northwestern Arkansas.

Remarks. Representatives of the dilatata group possess anterior lobes/ornamentations at the same terminal position as the dorsal/ventral ones of the castanea group. We combine these conditions and define Mimuloria as having apically lobed or ornamented acropodites.

The pregonopodal tarsal claws in Mimuloria are the second type that Hoffman (1964) characterized in Note 1 at the conclusion of his work. They are broad and somewhat flattened/ spatulate but not twisted; they also narrow apically and are subacuminate rather than truncate ( Fig. 7 ). Gonapophyses are broad basally and relatively long for such relatively small-bodied millipeds ( Fig. 5 ).

The Castanea Group. Acropodites of the castanea group angle or arch variably mediad in situ, thereby crossing midlines of the bodies and the opposite members, terminating at the level of the latter’s coxa. The apical acropodital lobes are short, narrow, and inconspicuous in ventral view; one must reorient the structure or focus down on the terminus to see them. Instead of terminating at this position, a short, subtriangular, caudally-directed lamina arises from the inner acropodital surface that carries the prostatic groove to its opening ( Fig. 9, 11–13, 15–17 ). Prefemoral processes vary from short to nubbin-like, and variable projections may or may not arise from its corners. That from the inner corner (relative to the acropodital arc) is longer and more prominent, being blade-like and extending for 1/3 of the acropodital length in M. davidcauseyi and short, narrow, and acuminate in M. castanea .

Components. M. castanea ( McNeill 1887) , M. missouriensis Chamberlin 1928 , and M. davidcauseyi ( Causey 1950a) .

Distribution. The castanea group is the exclusive inhabitant of the western 1/3 of the tribal distribution, extending from northeastern Indiana and western Tennessee to northwestern Arkansas and southwestern Missouri.

Figures

Figures 3–8. The castanea group, somatic and in situ features. 3) M. castanea, dorsal views of two recently molted females from Carroll Co., Arkansas. 4–8) M. davidcauseyi male from Newton Co., Arkansas. 4) Left side of three midbody tergites, dorsal view. 5) Head, antennae, and segments 1–7, anterior and subventral views, respectively. 6) Midbody sterna and basal podomeres, ventral view. 7) Gonopods in situ, ventral view. al, anterior sternal lobe; cl, caudal sternal lobe. 8) Pregonopodal tarsal claws, ventral view.

Figures 9–17. The castanea group, genitalic features. 9–14) M. castanea. 9) Telopodite of left gonopod of holotype, ventral view. 10) Prefemoral process of variant with long inner branch, ventral view. 11–13) Distal extremities of acropodital variants in medial, dorsomedial, and dorsal views, respectively. 14) Left cyphopod of female paratype, subventral view. 15) M. missouriensis holotype, telopodite of left gonopod, ventral view. 16–17) M. davidcauseyi holotype. 16) Telopodite of left gonopod, ventral view. 17) The same submedial view. dl, dorsal apical lobe; pfp, prefemoral process; r, receptacle; tl, terminal triangular lamina; v, valve; vl, ventral apical lobe.