Petrolisthes tuberculatus ( Guérin, 1835 )
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https://doi.org/ 10.11646/zootaxa.4623.2.10 |
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lsid:zoobank.org:pub:66AB57EA-9AC9-4228-8CD7-95590A17D7B7 |
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https://treatment.plazi.org/id/03B9F136-F862-640A-FF16-5F7216BB3D34 |
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treatment provided by |
Plazi |
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scientific name |
Petrolisthes tuberculatus ( Guérin, 1835 ) |
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Petrolisthes tuberculatus ( Guérin, 1835) View in CoL
Zoea I ( Figs 2A View FIGURE 2 , 3A, 3D View FIGURE 3 . 1 View FIGURE 1 , 3D View FIGURE 3 . 2 View FIGURE 2 , 4A, 4D View FIGURE 4 , 5A, 5D View FIGURE 5 , 6A View FIGURE 6 , 7E View FIGURE 7 )
Size: CL = 1.673 ± 0.21 mm; RPL = 8.815 ± 0.14 mm; RL = 4.433 ± 0.10 mm; PL = 2.728 ± 0.06 mm; n = 9.
Color in life: Carapace and appendages essentially transparent, with 2 red stripes along rostral spine, and single red stripe at tip of both posterior spines.
Cephalothorax ( Fig. 2A View FIGURE 2 ): Typical porcellanid shape, with rostral spine extremely elongated. Rostral spine approximately 3 times longer than CL and covered by spinules. Elongated posterior spines each with 2 rows of spinules along entire ventral margin. One pair of small plumose setae in anteromedian region and 1 minute tubercle on posterior region. Ventral margin of carapace with serrated edge. Eyes sessile.
Antennule ( Fig. 3A View FIGURE 3 ): Uniramous. Swollen medially and narrowing distally. Endopodal bud rudimentary. Exopod unsegmented, with 3 aesthetascs and 3 distal setae (1 simple short + 2 plumose long). Accessory flagellum absent.
Antenna ( Figs. 3D View FIGURE 3 . 1 View FIGURE 1 , 3D View FIGURE 3 . 2 View FIGURE 2 ): Biramous. Endopod fused with protopod, bearing 1 subterminal plumose seta, distal apex narrowly pointed. Exopod slender, tapering distally, approximately 2 times as long as endopod, with 1 subterminal plumose seta and 1 subterminal spinule. Distal margin of exopod occasionally with bifurcated terminal edge (see Fig 3D View FIGURE 3 . 2 View FIGURE 2 ).
Mandible ( Fig. 4A View FIGURE 4 ): Asymmetrically dentate, incisor processes with sharp teeth. Molar processes serrated. Mandible palp absent.
Maxillule ( Fig. 4D View FIGURE 4 ): Coxal endite with 8 setae (plumodenticulate, sparsely-plumose and distally plumose). Basial endite with 10 setae (6 stout laterally-denticulated, 4 plumodenticulate). Endopod unsegmented, with 4 sparsely-plumose setae and microtrichia on dorsal margin.
Maxilla ( Fig. 5A View FIGURE 5 ): Coxal endite bilobed; proximal lobe with 8 setae (simple and sparsely-plumose), distal lobe with 4 setae (simple, sparsely-plumose and laterally-plumose). Basal endite bilobed; proximal lobe with 7 setae (simple, stout laterally-denticulated, sparsely-plumose and laterally-plumose), distal lobe with 7 setae (simple and sparsely-plumose). Endopod unsegmented, with 9 setae (3+2+4 simple and sparsely-plumose). Scaphognathite with 6+1 plumose setae on anterolateral and posterior margin, respectively.
First maxilliped ( Fig. 5D View FIGURE 5 ): Biramous. Coxa with 2 simple setae. Basis with 2+2+2+3 simple setae on ventral margin. Endopod 4-segmented, with 3,3,2+3,1+6–7 setae (first to third segment with simple and sparsely-plumose setae, fourth segment with simple, laterally-plumose and sparsely-plumose setae). Exopod incompletely 2-segmented, with 0,4 plumose-natatory terminal setae.
Second maxilliped ( Fig. 6A View FIGURE 6 ): Biramous. Coxa without setae. Basis with 1+2 simple setae on ventro-distal margin. Endopod 4-segmented, with 2,2,1+2,1+5 setae (first to third segments with simple setae; fourth segment with simple, laterally plumose and sparsely plumose setae). Exopod incompletely 2-segmented, with 0,4 plumose-natatory setae.
Third maxilliped: Present as small bud, perceptible under carapace.
Pereiopods: Present as small buds, perceptible under carapace.
Pleon ( Fig. 7E View FIGURE 7 ): Four pleonites. Posterolateral spines present in all pleonites, but larger on third and fourth. Second to fourth pleonites slightly serrated on posterodorsal margin. Fourth pleonite with 1 pair of short simple setae near posterolateral angles, and 2 additional posterolateral spines.
Pleopods: Absent.
Telson ( Fig 7E View FIGURE 7 ): Longer than broad. Posterior margin produced into broad trapezoid, with 5 pairs of long, stout plumose setae bearing hooklets distally. Lateral angle each with 1 single stout spine and with 1 short laterally plumose seta. Dorsal surface with 3 pairs of short simple setae, as illustrated. Anal spine present.
Zoea II ( Figs 2B View FIGURE 2 , 3B, 3E View FIGURE 3 , 4B, 4E View FIGURE 4 , 5B, 5E View FIGURE 5 , 6B, 6D View FIGURE 6 , 7A, 7F View FIGURE 7 . 1 View FIGURE 1 , 7F View FIGURE 7 . 2 View FIGURE 2 )
Size: CL = 2.190 ± 0.51 mm; RPL = 12.762 ± 0.30 mm; RL = 7.625 ± 0.22 mm; PL = 3.301 ± 0.13; n = 8.
Color in life: same as in previous stage.
Cephalothorax ( Fig. 2B View FIGURE 2 ): Similar in shape to first zoea. Carapace with 3 pairs of small plumose setae (2 pairs in anteromedian region and 1 pair on posterodorsal region), and 1 tubercle in posterior region. Ventral margin of carapace with slightly serrated edge. Eyes stalked.
Antennule ( Fig. 3B View FIGURE 3 ): Biramous. Protopod with 1 short plumose seta at midlength of lateral margin. Endopod glabrous. Exopod with 6 rows of marginal aesthetascs (4+5+3+3+2+3) and 4 setae (1 subterminal simple + 1 terminal simple + 1 terminal lateral-plumose + 1 terminal plumose).
Antenna ( Fig. 3E View FIGURE 3 ): Endopod greatly elongated, 1.2 times as long as exopod.
Mandible ( Fig. 4B View FIGURE 4 ): Similar in shape to first zoea. Incisor processes with sharper teeth. Unsegmented mandible palp present.
Maxillule ( Fig. 4E View FIGURE 4 ): Coxal endite with 11 setae (5 cuspidate + 6 plumodenticulate). Endopod with 1 subterminal short simple setae.
Maxilla ( Fig. 5B View FIGURE 5 ): Coxal endite bilobed; proximal lobe with 11 setae (simple, stout laterally plumose and sparsely plumose), distal lobe with 7 setae (same typology as in proximal lobe). Basal endite bilobed; proximal lobe with 8 or 9 setae, distal lobe with 10 setae (same typology as in coxal endite). Scaphognathite with 21–23 marginal plumose setae.
First maxilliped ( Fig. 5E View FIGURE 5 ): Endopod 4-segmented, with 3+1,3+1,4+1,6-7+1 setae (long dorsal plumose and ventral or distal sparsely plumose). Exopod 2-segmented, with 0, 12 setae (2 proximal short plumose + 10 plumosenatatory).
Second maxilliped ( Fig. 6B View FIGURE 6 ): Basis with setae typology changed (1 subterminal long sparsely-plumose + 1 terminal long sparsely plumose + 1 terminal short sparsely plumose). Endopod 4-segmented, with 2+1,2+1,3+1,5+1 setae (long dorsal plumose, ventral and distal sparsely plumose). Exopod 2-segmented, with 0,12 setae (2 proximal short plumose + 10 plumose-natatory).
Third maxilliped ( Fig. 6D View FIGURE 6 ): Endopod elongated, swollen, slightly segmented, without setae. Exopod small, glabrous.
Pereiopods ( Fig. 7A View FIGURE 7 ): Well-developed, but not clearly segmented. First and fifth pereiopods bifid distally, with chelate appearance.
Pleon ( Fig. 7F View FIGURE 7 . 1 View FIGURE 1 ): Five pleonites. Third and fourth pleonites with 1 pair of short dorsal simple setae. Fifth pleonite with 1 pair of short simple setae near posterolateral angles, and 2 additional posterolateral spines.
Pleopods ( Fig. 7F View FIGURE 7 . 2 View FIGURE 2 ): Present as biramous buds, from second to fifth pleonites.
Telson ( Fig. 7F View FIGURE 7 . 1 View FIGURE 1 ): Posteromedian margin with 1 short but stout plumose seta.
Megalopa ( Figs 2 View FIGURE 2 C–E, 3C, 3F, 4C, 4F, 5C, 5F, 6C, 6E, 7B–D, 7G)
Size: CL = 1.62 ± 0.10 mm; CW = 1.50 ± 0.12 mm; n = 6.
Cephalothorax ( Figs 2D, 2C, 2E View FIGURE 2 ): Subcircular, slightly triangular, wider towards posterior region. Smooth tubercles on protogastric region, 1 on each side. Margin of concave intestinal region with 1 small posteriorly directed tubercle on central notch. Cephalothorax completely covered by small simple setae, symmetrically arranged along midline. Rostrum small, narrow, with distal end ventrally deflected approximately 55°. Trilobate front, with slightly serrulated edge. Eyes stalked, standing out from carapace, with 3 setae at base of each eye.
Antennule ( Fig. 3C View FIGURE 3 ): Peduncle 3-segmented, with 65 (10 plumose + 10 simple + 45 spiniform arranged in row), 1 terminal simple, 5 (2 subterminal simple + 3 terminal simple) setae, respectively. First segment broad, with 4 protuberances (1 basal + 3 terminal). Inner flagellum (endopod) 3-segmented, with 10 (4 short simple + 6 long simple), 4 simple, 9 simple setae, respectively. Outer flagellum (exopod) 6-segmented, with 0,0,0,3,4,2 simple setae and approximately 0,7,6,4,2,0 aesthetascs, respectively. All aesthetascs presents transverse soft clefts, distributed evenly, from base to apex.
Antenna ( Fig. 3F View FIGURE 3 ): Slightly longer than CL. Peduncle 3-segmented, with 0, 2, 2 simple setae, respectively. Flagellum with 18 segments, with 2–8 short simple setae on each segment, and 8 setae on last segment.
Mandible ( Fig. 4C View FIGURE 4 ): Palp 3-segmented, with 2 simple, 0, 12 stout denticulated setae.
Maxillule ( Fig. 4F View FIGURE 4 ): Coxal endite with 27-30 plumodenticulate setae. Basial endite with 1 median plumodenticulate + 23-37 terminal plumodenticulate setae. Endopod 2-segmented, with 0,1 simple seta, respectively. Basal lobe rounded, with microtrichia setae at lobe margin. Exopodal setae long and simple, near base of basal lobe.
Maxilla ( Fig. 5C View FIGURE 5 ): Coxal endite bilobed, with 33 (7 basal + 19 medial + 7 terminal) + 16 (7 basal at basal-terminal disposition + 3 subterminal + 6 terminal) plumodenticulate setae. Basal endite bilobed, with 12 (4 subterminal + 8 terminal) + 21 (1 subterminal + 20 terminal) plumodenticulate setae. Endopod unsegmented, with 3 plumose setae, and 2 minute spines at the distal end. Scaphognathite with 48–56 plumose setae on margin, and 2 pairs of simple setae in inner zone, one pair on dorsal face and other on ventral face.
First maxilliped ( Fig. 5F View FIGURE 5 ): Coxopodite with 20–23 (5 medial simple + 7 short denticulated + 8–11 long plumodenticulate) setae. Incipient sharp process located close to coxal endite at terminal margin. Basipodite weakly bilobed, with 29–34 (4 long simple + 2 inner short denticulated + 11–16 terminal simple) setae. Endopod unsegmented, with 2 basal plumodenticulate setae. Exopod unsegmented, with 2 (occasionally 3) medial plumose setae.
Second maxilliped ( Fig. 6C View FIGURE 6 ): Coxopodite with 8–10 (7 plumose + 1 or 2 short plumodenticulate + 0 or 1 simple) setae. Basipodite with 5–7 plumose setae. Endopod 4-segmented, with approximately 7,4,30,30 setae (segments 1 and 2 with plumose setae, segments 3 and 4 with laterally-plumose setae). Exopod 2-segmented, with 5–7 sparsely plumose, 5 plumose setae.
Third maxilliped ( Fig. 6E View FIGURE 6 ): Protopod with 14 or 15 (distally-plumose, short denticulated and simple) setae. Endopod 5-segmented, with approximately 30,30,40,22,15 setae, respectively (of which 16,16,14,12 are long setae). Exopod unsegmented and reduced, with 4 simple setae.
Pereiopods ( Figs 7B, 7C View FIGURE 7 ): All segments well differentiated, with simple setae arranged as illustrated. Chelipeds elongated, with 1 sharp and prominent spine at base of carpus, and 1 tubercle at proximal margin of propodus, near base of dactylus. Pereiopod II–IV with 1 terminal spine on propodus, and 3 spines along proximal margin of dactylus. Pereiopod V reduced in size and chelated, with 4 terminal setae on carpus, and 9–12 sensory setae distributed between propodus and dactylus ( Fig. 7C View FIGURE 7 ). Chela of pereiopod V showing triangular denticles at terminal margin of both segments, inner face of chela with simple setae.
Sternum ( Fig. 7D View FIGURE 7 ): Maxilliped sternites fused, with 8 simple setae. Sternites of pereiopods I–V with 6,3,2,2,0 simple setae, respectively. Protopod of pereiopods I–IV with 1 protuberance ventrally deflected at apex. Protopod of pereiopod V with 2 smaller protuberances, in same location as in preceding pereiopods, but not ventrally deflected. Protopod setation as illustrated.
Pleon ( Fig. 7G View FIGURE 7 ): With 6 well differentiated pleonites, each with setae symmetrically arranged axially, as shown.
Pleopods ( Fig. 7G View FIGURE 7 ): Present on pleonites II–V. Protopods without setae. Endopod of all pleopods with 2 simple setae (1 medial proximal + 1 subterminal distal), and 3–5 cincinuli on each endopod. Exopods each with 13 plumose natatory setae.
Uropods ( Fig. 7G View FIGURE 7 ): Protopod with 3 sparsely plumose setae. Endopod with 18 plumose natatory setae. Exopod with 18 (occasionally 20 or 21) plumose natatory setae.
Telson ( Fig. 7G View FIGURE 7 ): Unilobate, quadrangular, with notch on each lateral margin, towards distal region and before line of setae on terminal margin. Terminal margin with 24 (18 plumose-natatory + 6 short simple) setae. Dorsal region with 21–24 simple setae, symmetrically arranged to body axis.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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