Planche 1 issued from : M.J. Grygier & S. Ohtsuka in Zool. J. Linnean Soc., 2008, 152. [p.478, Fig.14]. SEM.
Female (from off Kabira, Ishigaki Island): A, habitus (lateral); B, anteroventral part of cephalothorax between oral papilla (o, its base artificially depressed) and base of left A1 (lateral), showing 3 scars (arrows); C, left A1 (dorsal view); D, detail of reticulation pattern of cephalothorax; E, dorsal view of body from rear of cephalothorax (top) to genital double somite (g, letter placed on this segment's dorsal suture) and coxae of right P1-P4; F, proximal parts of coxae of left P2-P4, showing spiny outer lobes; G, endopod of left P4 (posterior view), showing button-like vestige of inner seta of 12st segment (arrow), and absence of inner seta of 1st exopodal segment (below).
Scale bars = 0.500 mm (A); 0.100 mm (B, C, E); 0.020 mm in D; 0.050 mm. in F.

Planche 2 issued from : M.J. Grygier & S. Ohtsuka in Zool. J. Linnean Soc., 2008, 152. [p.472, Fig.8, B, C].
Female (Holotype from Sesoko Island): B, right A1 (ventral view); C, left A1 (dorsal view).
Scale bar = 0.100 mm.

Planche 3 issued from : M.J. Grygier & S. Ohtsuka in Zool. J. Linnean Soc., 2008, 152. [p.480, Fig.15]. SEM.
Female (ovigerous paratype): A, dorsal surface of free pedigers 1 and 2, anterior at top; B, dorsal surface of free pediger 3 (anterior at top); C, dorsal surface of free pediger 4, genital compound somite (g, letter placed on this segment's dorsal suture), and penultimate segment (anterior to left); D, genital compound somite (lateral view, anterior to left), showing bases of ovigerous spines (small arrow) and ventroposterior process (large arrow); E, exopod of left P2 or P3 (lateral view, anterior to left); F, detail of outer apical exopodal seta of swimming leg.
Scale bars = 0.050 mm (A-E); 0.010 mm in F.

Planche 4 issued from : M.J. Grygier & S. Ohtsuka in Zool. J. Linnean Soc., 2008, 152. [p.481, Fig.16].
Female (holotype): A, P1 (anterior); B, P2 (posterior); C, P3 (anterior); D, P4 (posterior).
Left legs 1-4, setules omitted and most setae cut short, showing invaginations or vestigial buttons in place of proximal inner endopodal seta of each leg (arrows).
Scale bar = 0.100 mm.

Planche 5 issued from : M.J. Grygier & S. Ohtsuka in Zool. J. Linnean Soc., 2008, 152. [p.499, Fig.29].
Female: Dorsal and lateral pore and pit seta patterns, from rear of cephalothorax through genital compound somite.
Symbols: dots (three sizes) = pores; larger circles = pits of pit setae.
Pattern based on SEM and light microscopical examination.

Planche 6 Issued from : M.J. Grygier & S. Ohtsuka in Zool. J. Linnean Soc., 2008, 152. [p.493]. Key to the Ryukyu species of the Maemonstrilla hyottoko species-Group.
M. spinicoxa Female: 1 - Cuticle of cephalothorax, A1, lateral sides of trunk, dorsum telson, and caudal rami reticulated; outer faces of P1-P4 and dorsum of free pedigers, genital compound somite, and penultimate somite spinulose. Cephalothoracic reticulations comprising ridges with abundant or sparse spinules; simple or complex cuticular ornamentation within at least some meshes.
2 - Oral papilla large and conical, directed ventrally. Genital compound somite distinctly divided transverse ridge.
3 - P1-P4 each with two low, rounded lobes on outer proximal part of coxa; rest of outer face of coxa with fields of minute spinules separated by bare lanes. Cephalothoracic reticulations lacking side branches but bearing sporadic or sparse spinules; meshes uniformly polygonal over most surface.
4 - Proximal coxal lobes of P1-P4 bearing large, blunty rounded denticles. Pigment spots on the body absent. Posteroventral part of genital compound somite produced into spur; posterodorsal margins of this somite and penultimate somite distinctly denticulate. Body length < 2mm [after 4 females collected].

Compare with M. simplex, M. hyottoko, M. polka, M. okame.

Planche 7 Issued from : M.J. Grygier & S. Ohtsuka in Zool. J. Linnean Soc., 2008, 152. [p.477]. Maemonstrilla spinicoxa Female (from Sesoko Island, NW Okinawa).
- Cephalothoracic reticulation on unbranched fine ridges with occasional minute spinules; additional minute spinules sparsely distributed within meshes.- Spiniform A1 2- and 3-setae less than twice as long as 4-setae; apical 6ind.1-seta distinctly shorter than 6ind.2-seta.
- Oral papilla prominent and straight; base narrower than in M. hyottoko and M. polka.
- Proximal outer part of coxa of P1-P4 produced into 2 low, rounded lobes bearing numerous large, blunty rounded denticles; remainder of coxa with nubbly texture as seen by light microscopy, and outer side of exopod armed with denticles smaller than those on lobes.
- Genital compound somite with large, rounded anteroventral protrusion and small, rounded posteroventral spur.