Mimuloria davidcauseyi ( Causey 1950a )

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 : 10-12

Mimuloria davidcauseyi ( Causey 1950a) , revived combination

Fig. 4–8 , 16–17 .

Nannaria davidcauseyi Causey 1950a: 194 , fig. 3–4. Hoffman 1999: 366. Marek et al. 2014: 36. Castanaria davidcauseyi: Causey 1950b: 1 .

Mimuloria davidcauseyi: Causey 1955: 30 . Chamberlin and Hoffman 1958: 37.

Type specimens. Male holotype ( ANSP) and one male, one female, and one juvenile paratypes ( FSCA) collected by David Causey, 25 August 1950, at Jasper, Newton Co., Arkansas.

Diagnosis. Acropodite sublinear, angling or leaning mediad rather than curving or arching; inner projection of prefemoral process long and blade-like, extending for 1/3 or more of acropodital length.

Color in life. Males from Newton Co., Arkansas, were more fully tanned than the M. castanea females, but displayed similar colors and patterns. Paranotal margins and peritremata were clear, translucent, and colorless with irregular, light pinkish-orange spots internally ( Fig. 4 ) and broad, concolorous bands along the anterior margins of the collums. The background color was a moderately dark olive-green that was the same darkness on both the anterior and caudal halves of the metaterga. The head color was an even darker olive green on the epicranium that became slightly but progressively lighter anteriorly. Antennomeres 2–6 were moderately dark and articles 1 and 6 were white and slightly tinted, respectively ( Fig. 5 ).

Holotype. Fragmented into four pieces; length 21.8 mm, maximum width 4.0 mm ( Causey 1950a), W/L ratio 18.3%. Somatic features agreeing closely with those of M. castanea with following exceptions. Width across genal apices 2.5 mm, segmental widths: collum 3.3 mm, 2 nd – 16 th segments 4.0 mm, 17 ~ 3.5 mm. Facial setae as follows: epicranial 0–0, interantennal 2–2, subantennal 1–1, frontal 1–1, genal 0–0, clypeal 1–1, labral 12–12. Antennae 2.5 mm long, reaching back to midlength of 3 rd tergite; relative lengths of antennomeres 6=3>4=5=2>1>7 ( Fig. 5 ). Collum 1.6 mm long. Terga with faint wrinkling. Anterior corners of 2 nd – 4 th paranota rounded, caudolateral corners slightly extended, becoming more so and triangular on 12 th paranota. Caudal sternal spines strong and robust, anterior ones smaller and broader ( Fig. 6 ). Relative lengths of postgonopodal podomeres 3>6>2>4=5=1. Coxae sparsely hirsute, prefemora with hairs distal to midlengths, becoming progressively denser on distal podomeres ( Fig. 7 ), those on tarsi exceeding lengths of claws; prefemoral spines moderately long ( Fig. 6 ). Tarsal claws broadened, flattened, and somewhat spatulate but not twisted on legs 1–14 (segment 2 through anterior legs on segment 10), apically subacuminate ( Fig. 7 ).

Gonopods in situ ( Fig. 5, 8 ) overhanging caudal extremity of 5 th sternum. Gonopod structure ( Fig. 8 , 16–17 ) as follows: Prefemoral process long and blade-like, extending for nearly half of acropodital length. Latter sublinear, angling mediad; otherwise as described for M. castanea .

Male paratype. The male paratype agrees closely with the holotype.

Variation. We examined six males of this species and found no variation.

Distribution. Known only from a two county area in northwestern Arkansas. Mimuloria davidcauseyi seems to have “carved out” a small enclave in northwestern Arkansas just inside the peripheries of the generic/tribal ranges and that of M. castanea .

Published records. Arkansas: Newton Co. ( Causey 1950b), Jasper and 4.8 km (3.0 mi) NW Jasper ( Causey 1950a 1955; Chamberlin and Hoffman 1958; Hoffman 1999; Marek et al. 2014). Kentucky: Fayette Co., Lexington ( Causey 1955).

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.