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A New Species of Pseudopaguristes Mclaughlin, 2002 (Crustacea: Decapoda: Diogenidae) from Japan

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A New Species of Pseudopaguristes Mclaughlin, 2002 (Crustacea: Decapoda: Diogenidae) from Japan PROCEEDINGS OF THE BIOLOGICAL SOCIETY OF WASHINGTON 116(2):453-463. 2003. A new species of Pseudopaguristes McLaughlin, 2002 (Crustacea: Decapoda: Diogenidae) from Japan Akira Asakura and Patsy A. McLaughlin (AA) Natural History Museum and Institute, Chiba. 955-2, Aoba-cho, Chuo-ku, Chiba 260-8682, Japan; (PM) Shannon Point Marine Center, Western Washington University, 1900 Shannon Point Road, Anacortes, Washington 98221-908IB, U.SA. Abstract.—Pseudopaguristes bollandi, a new species of the recently estab- lished diogenid genus Pseudopaguristes McLaughlin, is described and illus- trated from Okinawa, Japan. This is only the second species assigned to this genus. A distinctive and unfamiliar hermit crab is no pleurobranch on the thoracic wall from Okinawa was recently send to the first above the second pereopod. The specimen author for identification. This specimen su- from Okinawa clearly belongs to Pseudo- perficially looked very much like a species paguristes and represents a new species de- of the diogenid genus Paguristes Dana, scribed herein. The holotype is deposited in 1851, particularly in having paired first and the Natural History Museum and Institute, second pleopods modified as gonopods. Chiba (CBM-ZC). Terminology used fol- However, the right cheliped was larger than lows McLaughlin (1974) with the exception the left, a character uncommon in species of the fourth pereopods as defined by of that genus. Further examination revealed McLaughlin (1997), and gill structure as de- a gill formula aberrant for Paguristes. fined by McLaughlin & de Saint Laurent McLaughlin (2002) recently established (1998). Abbreviations used are; coll., collec- the new genus Pseudopaguristes, for P. ja- tor; and SL, shield length, measured from netkae McLaughlin, 2002, a brilliantly col- the tip of the rostral lobe to the posterior ored and strikingly sexually dimorphic spe- margin of the shield. cies from Guam, Micronesia. Females of Pseudopaguristes could easily be assigned Pseudopaguristes bollandi, new species to the genus Paguristes, because the cheli- Figs. 1-8 peds are similar in size and armature, a char- acter commonly seen in Paguristes. How- Material examined.—Holotype: male, ever, the males differ appreciably in having SL = 3.2 mm, 69 m, Seragaki, Onna-son, chelipeds quite dissimilar in armature, with Kunigami-gun, Okinawa-hontow, 14 Aug the right largest. McLaughlin reported that 2000, coll. R. F. Bolland, CBM-ZC 6442. males and females of Pseudopaguristes Description.—Eight functional pairs of share with Paguristes the distinctive char- weakly quadriserial, phyllobranchiate gills acter of sexually modified pleopods. How- (Fig. 1 A, B). Shield (Fig. 1C) 1.2 times lon- ever, Pseudopaguristes janetkae has only ger than broad; anterior margin between eight functional pairs of gills, whereas Pa- rostrum and lateral projections concave; lat- guristes species have 13 pairs. In Pseudo- eral projections (Fig. ID) triangular, right paguristes janetkae, the paired arthrobranchs with small, submarginal, corneous spine, at the base of the third maxillipeds and che- left unarmed; anterolateral angles (Fig. IE) lipeds are rudimentary or vestigial, and there each with strong corneous spine (not visible 454 PROCEEDINGS OF THE BIOLOGICAL SOCIETY OF WASHINGTON Fig. 1. Pseudopaguristes bollandi, new species, holotype male (CBM-ZC 6442), SL = 3.2 mm, Seragaki, Onna-son, Kunigami-gun, Okinawa-hontow. A, arthrobranch gill lamella; B, position and shape of gills; C, shield and cephalic appendages; D, ocular acicles and anterior portion of shield; E, right lateral view of ocular peduncle, antenna and anterior portions of branchiostegite and shield; F, left antennule, lateral view; G, left antenna, lateral view; H, antennal flagellum. Scales equal 0.33 mm (A) and 1 mm (B-H). VOLUME 1 i6, NUMBER 2 455 Fig. 2. Pseudopaguristes bollandi, new species, holotype male (CBM-ZC 6442), SL = 3.2 mm, Seragaki, Onna-son, Kunigami-gun, Okinawa-hontow. Left mouthparts: A, mandible, external; B, maxillule, external; C, same, endopod; D, maxilla, internal; E, first maxilliped, internal; F, second maxilliped, external; G, third max- illiped, external; H, ischium and basis of same, internal. Scales equal 1 mm. in dorsal view); lateral margins straight; 1C, E) very slightly dilated. Ocular acicles posterior margin truncate; dorsal surface (Fig. ID) with 2 (right) or 3 (left) strong slightly convex, with scattered tufts of short corneous spines on distal margin; separated setae and 1 or 2 short ridges laterally. Ros- basally by more than breadth of rostrum. trum (Fig. ID) prominent, triangular, pro- Antennular peduncles (Fig. 1C, F) stout; duced beyond bases of ocular acicles, with when fully extended, distal margins of ul- terminal corneous spine. Accessory por- timate segments very slightly exceeding tions of shield (Fig. 1C) small, well calci- distal margins of corneas; ultimate and pen- fied, unarmed. Branchiostegites (Fig. IE) ultimate segments each with tuft of setae partially calcified anterodorsally, with row dorsodistally; basal segment with acute of acute, slender spines, several corneous- spine laterally. tipped, on dorsodistal and anterodorsal mar- Antennal peduncles (Fig. 1C-E, G) mod- gins. erately long, when fully extended, reaching Ocular peduncles (Fig. 1C) moderately bases of corneas; fifth segment with row of short, 0.6 length of shield. Corneas (Fig. setae dorsally and laterally; fourth segment 456 PROCEEDINGS OF THE BIOLOGICAL SOCIETY OF WASHINGTON Fig. 3. Pseudopaguristes bollandi, new species, holotype male (CBM-ZC 6442), SL = 3.2 mm, Seragaki, Onna-son, Kunigami-gun, Okinawa-hontow. Right cheliped: A, dorsal; B, mesial; C, lateral; D, dactyl and fixed finger, ventral; E, fixed finger, dorsal. Scales equal 1 mm. with strong corneous spine at dorsodistal gle produced, bearing 3 strong corneous margin and another corneous spine at ven- spines, dorsomesial distal angle with acute trodistal margin; third segment with prom- corneous spine; first segment unarmed. An- inent corneous spine at ventrodistal margin; tennal acicles moderately long, straight; lat- second segment with dorsolateral distal an- erally compressed; dorsomesial and ventro- VOLUME 1 i6, NUMBER 2 457 Fig. 4. Pseudopaguristes bollandi, new species, holotype male (CBM-ZC 6442), SL = 3.2 mm, Seragaki, Onna-son, Kunigami-gun, Okinawa-hontow. Left cheliped: A, dorsal; B, mesial; C, lateral; D, anterior portions of dactyl (tip broken) and fixed finger, dorsal; E, same, ventral. Scales equal 1 mm. mesial margins each with row of corneous- lobe with 2 bristles. Maxilla (Fig. 2D) with tipped slender spines; distal margins each moderately narrow scaphognathite. First with 3 strong corneous spines; lateral mar- maxilliped (Fig. 2E) with well developed, gins each with strong, subdistal corneous setose epipod. Second maxilliped (Fig. 2F) spine. Antennal flagella (Fig. 1H) consist- without distinguishing characters. Third ing of about 15 articles, each article with maxilliped (Figs. 2G, H, 7A) with dorso- several setae of various lengths. distal margin of carpus bearing acute cor- Mandible (Fig. 2A) without distinguish- neous spine; merus with ventral margin ing characters. Maxillule (Fig. 2B, C) with bearing row of slender corneous-tipped external lobe of endopod recurved, internal spines, and dorsodistal margin bearing 458 PROCEEDINGS OF THE BIOLOGICAL SOCIETY OF WASHINGTON acute corneous spine; ischium with well-de- spines and sparse setae on ventromesial veloped crista dentata, no accessory tooth, margin. Coxa (Fig. 7B) with strong corne- strong corneous spine at ventrodistal mar- ous spine ventromesially. gin; basis with few corneous spines. Second pereopods (Fig. 5A-C) similar Right cheliped (Fig. 3) larger than left. from left to right. Dactyls 1.1 length of pro- Dactyl 0.4 length of palm; terminal margin podi, each terminating in strong corneous slightly convex, with very broad corneous claw; mesial faces each with row of cor- claw (Fig. 3D); dorsal face flat, with scat- neous or corneous-tipped spines dorsally tered tubercles; cutting edge with 1 strong (Fig. 5B); ventral margins each with row of and 4 broad, low calcareous teeth. Fixed 9 (left) or 10 (right) strong corneous spines. finger terminating in small corneous-claw Propodi 1.8 length of carpi, each with row (Fig. 3E); ventral face with row of 3 cor- of 10 (left) or 12 (right) strong corneous neous tubercles (Fig. 3D); dorsal face flat, spines on dorsal margin and 1 (right) or 2 with scattered tubercles; cutting edge with (left) acute corneous spines at ventromesial 7 strong calcareous teeth. Palm 1.5 length distal margin (Fig. 5B). Carpi 0.6 length of of carpus; dorsal surface flat, with scattered meri, each with strong, corneous-tipped, tubercles; dorsomesial margin with row of slender spine at dorsodistal angle and row very strong spines; dorsolateral margin with of 5 (left) or 4 (right) slender, corneous- row of spines. Carpus 0.6 length of merus; tipped spines on dorsal face mesially (Fig. dorsal face with scattered spines, dorsolat- 5C). Meri with ventral margins each bear- eral and dorsomesial margins each with row ing acute subdistal spine and row of slender of very strong spines. Merus with numerous corneous-tipped spines; dorsal margins spines, some corneous-tipped, on distal half each with proximal row of corneous-tipped of dorsal face; ventromesial margin with spines. Ischia each with few, slender cor- strong corneous or corneous-tipped spines; neous-tipped spines dorsally. Coxae (Fig. ventrolateral margin with row
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