Catapaguroides cristimanus de Saint Laurent, 1968

Komai, Tomoyuki & Rahayu, Dwi Listyo, 2013, The Hermit Crab Genus Catapaguroides A. Milne-Edwards & Bouvier, 1892 (Crustacea: Decapoda: Anomura: Paguridae) From The Bohol Sea, Philippines, With Descriptions Of Eight New Species, Raffles Bulletin of Zoology 61 (1), pp. 143-188 : 158-162

Catapaguroides cristimanus de Saint Laurent, 1968

( Figs. 9–11 )

Catapaguroides cristimanus de Saint Laurent, 1968: 949 , fig. 30; Asakura, 2004: 456, fig. 1; 2005: 133, figs. 1, 2A, B; McLaughlin et al., 2010: 28 (list)

Material examined. –– Two females (sl 1.3, 1.3 mm), PANGLAO 2004, stn T1 , Bolod , Panglao Island, 09°32.4'N, 123°47.3'E, 83– 102 m, mud with many sponges, 30 May 2004, ZRC 2012.1093 .

Additional material. –– One male (sl 2.5 mm), TRV Toyoshiomaru , 1996-6 cruise, stn 7, SE of Tanegashima Island, Ohsumi Islands, 30°15.00'N, 130°45.00'E, 75 m, sand, 2 Jun.1996, dredge, coll. T. Komai, CBM-ZC 9019 .

Description. –– Ten pairs of biserial phyllobranchiate gills; 2 arthrobranchs on third maxilliped each reduced to minute bud; other arthrobranchs distinctly lamellate; no pleurobranchs on wall of seventh thoracic somite.

Shield ( Fig. 9A ) approximately as long as wide; anterior margins between rostrum and lateral projections concave; anterolateral margins sloping, posterior margin truncate; dorsal surface with tufts of short setae laterally. Rostrum rounded. Lateral projections triangular, produced to level of rostrum, with marginal spine.

Ocular peduncle ( Fig. 9A ) subequal in length to shield, slender, slightly widened basally; dorsal surface mesially with 2 or 3 tufts of moderately long setae in distal 0.7; corneas normally developed, rounded, slightly dilated, slightly longer than wide, corneal width 0.3 of peduncular length. Ocular acicle small, triangular, with submarginal distal spinule, separated to each other basally by more than basal width of 1 acicle. Interocular lobe with slightly convex anterior surface.

Antennular peduncle ( Fig. 9A ), when fully extended, overreaching distal corneal margin by approximately entire length of ultimate segment. Basal segment elongate, with small spine proximolaterally. Ultimate segment 0.8 length of shield, slightly widened distally in lateral view, with 2 long plumose setae at dorsolateral distal portion. Dorsal flagellum longer than ultimate peduncular segment, distal portion exceeding twice length of proximal aesthetascbearing portion.

Antennal peduncle ( Fig. 9A ) slightly falling short of distal corneal margin. Fifth and fourth segments with few short setae. Third segment with 1 prominent spine at ventromesial distal angle. Second segment with dorsolateral distal angle strongly produced in simple or bifid spine not reaching midlength of fourth segment; dorsomesial distal angle with small spine. First segment unarmed. Antennal acicle slender, gently arcuate, slightly overreaching base of cornea, terminating in slender spine, with row of short to long stiff setae along entire length. Antennal flagellum exceeding 4.0 times of shield length; articles each with several short to long setae on distal margin (long setae present every 4 or 5 articles).

Third maxilliped moderately stout; crista dentata on ischium consisting of 2–4 sharp teeth. Carpus without dorsodistal spine.

Chelipeds ( Figs. 10 , 9B–E ) appreciably unequal and dissimilar. Female right cheliped ( Fig. 10A–E ) large, not elongate; propodal-carpal articulation rotated clockwise about 40° from perpendicular. Chela subcircular, operculiform, about 1.4 times longer than wide, widest at base of dactylus. Dactylus broad, articulating obliquely with palm, strongly curved ventrally; dorsal surface slightly elevated in midline and slightly upturned along mesial margin, unarmed, bearing tufts of short setae along midline; mesial margin lamellar; ventral surface channeled laterally and elevated mesially, with tufts of short setae along cutting edge; cutting edge with 3 triangular calcareous teeth, terminating in small corneous claw. Palm about 1.1 length of carpus, widened distally; dorsal surface slightly convex, with dorsomesial row of 3 or 4 small spines and with longitudinal rows of tufts of short setae, median row of setae extending onto fixed finger; lateral part strongly compressed dorsoventrally, upturned along lateral margin, lateral margin lamellar; dorsomesial margin not distinctly delimited; ventral surface slightly convex in general, almost glabrous. Fixed finger very broad, with tufts of short setae along lateral margin; cutting edge with 2 triangular calcareous teeth, terminating in small calcareous claw. Carpus subequal in length to merus, widened distally, 1.1–1.2 times longer than distal width; dorsal surface with row of 5 or 6 small spines on slightly elevated midline, including distal marginal spine; dorsomesial distal angle with 1 minute spine; lateral surface almost glabrous, ventrolateral distal angle unarmed; mesial face with some tufts of long setae dorsally; ventral surface convex. Merus with few tufts of stiff setae on dorsal surface; dorsodistal margin with 1 small spine mesially; lateral surface glabrous, ventrolateral margin with 2 small spines distally; mesial surface almost glabrous, ventromesial margin strongly raised, with 4 small spines distally; ventral surface convex laterally, with few setae. Ischium unarmed.

Male right cheliped ( Fig. 10F ) generally similar to female right cheliped, but proportionally longer. Chela subrectangular, 1.8 times longer than wide. Carpus 1.5 times longer than distal width.

Left cheliped ( Fig. 9B–E ) moderately slender, reaching midlength of dactylus of right chela; propodal-carpal articulation rotated counter-clockwise 20 ° from perpendicular. Chela not arched; no hiatus between fingers. Dactylus about 1.4 length of palm, unarmed, with sparse tufts of short to long setae; dorsomesial margin not delimited; cutting edge with row of small corneous teeth in distal 0.7, terminating in small corneous claw. Palm about half length of carpus; dorsal surface slightly convex, unarmed; surfaces with tufts of short to long setae. Fixed finger with cutting edge thin, faintly denticulate, terminating in small corneous claw. Carpus slightly widened distally; dorsal surface with dorsolateral row of 3 small spines and dorsomesial row of 4 small spines (including those on dorsodistal margin) and with dorsomesial row of tufts of long stiff setae obscuring armature; lateral and mesial surfaces glabrous, ventrolateral distal angle unarmed; ventral surface slightly convex, with few long setae. Merus with few tufts of moderately long setae on dorsal margin; dorsodistal margin unarmed; ventrolateral margin with 2 strongly unequal subdistal spines (proximal spine strong); ventromesial margin with 1 small distal spine; ventral surface slightly convex, with some long setae. Ischium unarmed.

Ambulatory legs ( Fig. 11A, D ) long and slender. Dactyli ( Fig. 11B, E ) 1.4–1.6 times longer than propodi, 15.0–16.0 times longer than wide, straight in dorsal view, slightly curved ventrally in lateral view, terminating in elongate, slender corneous claws; dorsal margins each with sparse short setae; mesial faces each with dorsal row of moderately long thick bristles and ventral row of 4 or 5 slender corneous spines, and with additional row of bristles adjacent to ventral corneous spines in second. Propodi of second pereopods ( Fig. 11C ) each with cluster of 7 or 8 corneous spines (male) or 2 small slender corneous spines (female) on ventrodistal margin, those of third with 1 or 2 small corneous spines ventrodistally. Carpi each with minute dorsodistal spine. Meri with 1 minute ventrolateral distal spine (second) or unarmed (third); dorsal margins each with few moderately long setae. Ischia unarmed. Second pereopods with deep notch on ventral margin at articulation between merus and ischium. Female with unpaired left gonopore.

Fourth pereopod ( Fig. 9F ) semichelate; dactylus with several minute corneous teeth on ventral margin; propodal rasp consisting of 6 or 7 corneous scales arranged in single row. Fifth pereopods semichelate.

Anterior lobe of sixth thoracic sternite ( Fig. 9G, H ) relatively narrow, subsemicircular to subtrapezoidal, slightly skewed to left; anterior margin unarmed or armed with pair of minute tubercles, and with short to long setae.

Male with long sexual tube extending from coxa of right fifth pereopod ( Fig. 9I ), directed anterolaterally from right to left across ventral body surface and overreaching lateral margin of left coxa by more than half length of tube. Left coxa with papilla-like short sexual tube directed anteromesially, concealed by right tube and thick setae arising from eighth thoracic sternite.

Telson ( Fig. 9J ) narrowed posteriorly in posterior half; no lateral indentations; posterior lobes slightly asymmetrical, separated by deep median cleft; terminal margins strongly oblique, each with 1 or 2 small spines and spinose outer angle; lateral margins each delimited by chitinous plate.

Colouration. –– See Asakura (2005).

Distribution. –– Previously known from Kai Islands, Indonesia, and Ryukyu Islands, Japan, at depths of 90– 200 m. The present specimens represent the first record of this species from the Philippines.

Remarks. –– In her original description of C. cristimanus, de Saint Laurent (1968) noted that the antennal peduncle overreaches the distal corneal margin by the half-length of the fifth segment. However, Asakura (2004), who examined the type series (including the holotype and two paratypes) and additional specimens from Japan, showed that the antennal peduncle does not overreach the distal corneal margin in C. cristimanus . In addition, de Saint Laurent (1968) mentioned the presence of two mesial tubercles on the left palm in the original description, but Asakura (2004) indicated that there were no such tubercles. The present specimens well support Asakura’s (2004) observation.

As McLaughlin (1997) argued, C. cristimanus appears closest to C. karubar in having an operculiform right chela. Differentiating characters between the two species are discussed under the account of C. karubar .

Figures

Fig. 9. Catapaguroides cristimanus de Saint Laurent, 1968. A–E, F, G, J, female (sl 1.3 mm), PANGLAO 2004, stn T1, ZRC 2012.1093; H, I, male (sl 2.5 mm), SE of Tanegashima Island, Ohsumi Islands, Japan, CBM-ZC 9019. A, shield and cephalic appendages, dorsal view; B, left cheliped, mesial view; C, same, lateral view (setae omitted); D, same, chela, dorsal view; E, same, carpus, dorsal view; F, distal three segments of left fourth pereopod, lateral view; G, sixth thoracic sternite, ventral view; H, anterior lobe of sixth thoracic sternite, ventral view; I, coxae of fifth pereopods and eighth thoracic sternite, ventral view; J, telson, dorsal view. Scale bars = 0.5 mm.

Fig. 10. Catapaguroides cristimanus de Saint Laurent, 1968. A–E, female (sl 1.3 mm), PANGLAO 2004, stn T1, ZRC 2012.1093; F, male (sl 1.6 mm), SE of Tanegashima Island, Ohsumi Islands, Japan, CBM-ZC 9019. A, right cheliped, mesial view; B, same, lateral view (setae omitted); C, same, chela, dorsal view; D, same, ventral view; F, chela and carpus of right cheliped, dorsal view. Scale bars = 1 mm (F); 0.5 mm (A–E).

Fig. 11. Catapaguroides cristimanus de Saint Laurent, 1968, female (sl 1.3 mm), PANGLAO 2004, stn T1, ZRC 2012.1093; C, male (sl 1.6 mm), SE of Tanegashima Island, Ohsumi Islands, Japan, CBM-ZC 9019. A, right second pereopod, lateral view; B, same, dactylus, mesial view (dorsal setae partially omitted); C, distal part of propodus of right second pereopod, lateral view, showing armature on ventrodistal margin; D, left third pereopod, lateral view; E, same, dactylus, mesial view (dorsal setae partially omitted). Scale bars = 0.5 mm.