Micropagurus, McLaughlin, 1986

Asakura, Akira, 2005, A review of the genus Micropagurus (Crustacea Decapoda Anomura Paguridae), Zootaxa 1090 (1), pp. 1-34 : 32-33

Key to species of male Micropagurus

Since only males were collected in M. propinquus , the morphological key to only males of each species is provided here. Future collecting efforts are needed to provide a key to both sexes.

1. Dorsal faces of carpi of ambulatory pereopods unarmed ( Fig. 2A,C ) ............................ ................................................................................... M. acantholepis ( Stimpson, 1858)

– Dorsal faces of carpi of ambulatory pereopods each armed with 2­5 spines ................ 2

2. Mesial faces of dactyls of ambulatory pereopods each with dorsal row of thick spinelike setae ( Fig. 12B, D, F, H ) ........................................................ M. spinimanus n. sp.

– Mesial faces of dactyls of ambulatory pereopods without dorsal row of thick spine­like setae............................................................................................................................... 3

3. Palm of right cheliped provided with irregular row of small tubercles or very small spines in midline ( Fig. 15A ) .......................................... M. polynesiensis ( Nobili, 1906)

– Palm of right cheliped provided with irregular row of strong spines in midline .......... 4

4. Ventral margins of dactyls of third pereopods each with 5–7 spines ( Fig. 6D ) .............. ....................................................................................................... M. propinquus , n. sp.

– Ventral margins of dactyls of third pereopods each with 2–4 spines .............................. ....................................................................................... M. devaneyi McLaughlin, 1986

Figures

FIGURE 2. Micropagurus acantholepis (Stimpson, 1858): neotype, ♂, SL = 1.7 mm, Port Jackson, New South Wales, NHM 1888: 33. Left third pereopod: A, lateral; B, dactyl, mesial; C, carpus, mesial, setae omitted. Anterior lobe of sternite of third pereopods: D, ventral. Posterior portion of carapace, anterior portion of pleon, and proximal portion of left fifth pereopod: E, dorsal, setae omitted. Coxae and sternite of fifth pereopods: F, ventral. Tergite of sixth pleonal somite and telson: G, dorsal. Scales for A–C and E–G = 1 mm. Scale for D = 0.5 mm.

FIGURE 6. Micropagurus propinquus n. sp.: holotype, ♂, SL = 1.6 mm, Chichijima, Ogasawara Islands, CBM­ZC 8378. Left second pereopod: A, lateral; B, dactyl and propodus, mesial. Left third pereopod: C, lateral; D, dactyl and propodus, mesial. Right fourth pereopod: E, lateral, setae omitted. Anterior lobe of sternite of third pereopods: F, ventral. Coxae and sternite of fifth pereopods and anterior portion of pleon: G, ventral. Tergite of sixth pleonal somite and telson: H, dorsal. Scales for A–D = 1 mm. Scales for E­H = 0.5 mm.

FIGURE 12. Micropagurus spinimanus n. sp.: holotype, ♂, SL = 2.6 mm, Touho, New Caledonia, Sept. 1993, MNHN­Pg 7265. Left second pereopod: A, lateral; B, dactyl and distal portion of propodus, mesial; C, carpus, mesial, setae omitted. Right second pereopod: D, dactyl and distal portion of propodus, mesial. Left third pereopod: E, lateral; F, dactyl and distal portion of propodus, mesial; G, carpus, mesial, setae omitted. Right third pereopod: H, dactyl and distal portion of propodus, mesial; I, carpus, mesial, setae omitted. Scales = 1 mm.

FIGURE 15. Micropagurus polynesiensis (Nobili, 1906): ♂, SL = 1.7 mm, Philippines, MNHN­Pg 2766. Male right cheliped: A, dorsal; B, mesial; C, lateral; D, dactyl and fixed finger, dorsal, setae omitted. Scales = 1 mm.