Micropagurus acantholepis ( Stimpson, 1858 )

Asakura, Akira, 2005, A review of the genus Micropagurus (Crustacea Decapoda Anomura Paguridae), Zootaxa 1090 (1), pp. 1-34 : 3-6

publication ID	https://doi.org/ 10.11646/zootaxa.1090.1.1
publication LSID	lsid:zoobank.org:pub:172D3D3A-0929-48AB-9BDE-A81674FD854C
persistent identifier	https://treatment.plazi.org/id/03C687CF-2E45-FFFD-FECA-FD40FBB3B8B8
treatment provided by	Felipe
scientific name	Micropagurus acantholepis ( Stimpson, 1858 )
status

Treatment

Micropagurus acantholepis ( Stimpson, 1858) View in CoL ( Figs. 1 View FIGURE 1 , 2 View FIGURE 2 , 19D View FIGURE 19 , 20 View FIGURE 20 )

Eupagurus acantholepis Stimpson, 1858: 251 View in CoL ; 1907: 229.

Anapagurus australiensis Henderson, 1888: 74 View in CoL , pl. 7: fig. 8.

Pagurus acantholepis .— Rathbun, 1907: 229 (foot note).

Micropagurus acantholepis View in CoL .— Gunn & McLaughlin, 1988: 68, fig. 1.— Tudge & Lemaitre, 2004: 107, figs. 1–6.

Material examined. Neotype (designated by Gunn & McLaughlin 1988), ♂, SL = 1.7 mm, 3.6–18 m, Port Jackson , New South Wales, Australia, H.M.S. "Challenger", NHM 1888: 33 (= syntype of Anapagurus australiensis ) . Other material: ♀, SL = 1.9 mm, data same as neotype (= syntype of Anapagurus australiensis ) .

Diagnosis. Shield ( Fig. 1A View FIGURE 1 ) slightly longer than broad; ocular peduncles 0.6–0.8 length of shield; corneas slightly dilated; pair of interocular lobes prominent; ocular acicles each with 3 or 4 (rarely 1) spines on distal margin; antennular peduncles reaching to bases of corneas or slightly beyond; antennal peduncles not overreaching ocular peduncles, third segment with spine at ventrodistal margin, second segment with dorsolateral distal angle produced and terminating in simple or bifid spine, dorsomesial distal angle with small spine; antennal acicles each terminating in small spine.

Third maxilliped with merus and carpus each bearing strong dorsodistal spine.

Right cheliped ( Fig. 1B, C View FIGURE 1 ) stout; dactyl with row of small corneous and calcareous teeth distally and 1 or 2 calcareous teeth proximally on cutting edge, dorsomesial margin with 2–4 small spines; palm with dorsal surface flat, bearing 3 spines or tubercles in longitudinal row in proximal half, dorsomesial margin with 1–5 spines, dorsolateral margin with row of spines extending onto fixed finger, cutting edge of fixed finger with few small calcareous teeth proximally and row of sharp corneous and blunt calcareous teeth distally; carpus with dorsomesial margin bearing row of 2–5 spines, dorsolateral margin with 1–4 spines, tubercles, and/or protuberances, lateral face occasionally with spine in proximal half.

Left cheliped ( Fig. 1D, E View FIGURE 1 ) slender; cutting edge of dactyl with row of small corneous teeth; palm with dorsal surface occasionally armed with single spine proximally, dorsomesial margin unarmed or with spine, dorsolateral margin with row of small spines extending onto fixed finger only proximally, fixed finger terminating in corneous claw, cutting edge with row of corneous teeth; carpus with dorsolateral margin bearing row of 3 or 4 spines, dorsomesial margin with row of few spines, tubercles and/or protuberances.

Second and third pereopods ( Fig. 2A–C View FIGURE 2 ) similar; ventral margins of dactyls each with 5–9 corneous spines; propodi each with 1–3 thick spinelike setae at ventrodistal margin mesially or unarmed; carpi unarmed.

Sternite of third pereopods with broad, subrectangular anterior lobe ( Fig. 2D View FIGURE 2 ) bearing setae anteriorly.

Male with coxa of left fifth pereopod ( Fig. 2E, F View FIGURE 2 ) bearing welldeveloped sexual tube; right coxa with gonopore.

Pleon with welldeveloped columellar muscle (cf. Chapple 1966) near anterior margin ventrally.

Telson ( Fig. 2G View FIGURE 2 ) with terminal margin rounded, unarmed or with 1–3 minute spinules on each side laterally.

Coloration. In life, shield and anterior projections flamed and mottled with red and brown, with overall background color yellowish or whitish; ocular peduncles pale color, with short oblique brown markings; corneas colorless; chelipeds and ambulatory pereopods whitish (after Gunn & McLaughlin 1988, and Fig. 19D View FIGURE 19 ).

Remarks. This species is easily separated from all other species of Micropagurus in having unarmed dorsal faces of the carpi of the ambulatory pereopods ( Fig. 2A, C View FIGURE 2 ); in other species of Micropagurus , these surfaces are armed with 2–5 spines (see Gunn & McLaughlin 1988).

Distribution. Known only from southeastern Australia: Port Jackson, New South Wales; Port Philip Bay and Western Port, Victoria; Port Lincoln, South Australia ( Gunn & McLaughlin 1988); occurring intertidally under stones (Anon., 1996).

Kingdom	Animalia
Phylum	Arthropoda
Class	Malacostraca
Order	Decapoda
Family	Paguridae
Genus	Micropagurus