Arcopotamonautes picus, Cumberlidge & Conners, 2024
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publication ID |
https://doi.org/ 10.11646/zootaxa.5538.4.3 |
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DOI |
https://doi.org/10.5281/zenodo.14611823 |
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persistent identifier |
https://treatment.plazi.org/id/C50387EE-FFEC-B35E-34CA-E07BEAD10451 |
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treatment provided by |
Plazi |
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scientific name |
Arcopotamonautes picus |
| status |
sp. nov. |
Arcopotamonautes picus View in CoL sp. nov.
( Figs. 1–4 View FIGURE 1 View FIGURE 2 View FIGURE 3 View FIGURE 4 , 11 View FIGURE 11 )
Type material. Holotype: NMU TRW1964.03A , adult male (CW 15.6, CL 11.6, CH 5.1, FW 5.2 mm), Tanzania, Amani Area , East Usambara Mountains (-5.083333, 38.666667, 801 m ASL), coll. J. N. Raybould, 1 January 1964. GoogleMaps
Other material examined. NMU TRW1964.03 B, 2 adult males (CWs 18.2, 17.1 mm), Tanzania, Amani Area , East Usambara Mountains (-5.083333, 38.666667, 801 m ASL), coll. J. N. Raybould, 1 January 1964 GoogleMaps . NMU TRW1970.06 , 3 subadult males (CWs 10.9–12.1 mm), 3 subadults (CWs 9.8–12.2 mm), 6 adult males (CWs 15.0– 18.4 mm), 5 adult females (CWs 18.4, 17.8, 17.3, 17.0, 16.9 mm), 4 subadult females (one damaged) (CWs 12.8– 14.2 mm), Amani Area , East Usambara Mountains (-5.083333, 38.666667, 801 m ASL), coll. J. N. Raybould, 1970 GoogleMaps . NMU 09.03.1972 , 4 adult females (CWs 15.9–18.2 mm), 7 subadult and adult males (CWs 14.7–18.6 mm), Amani Area , East Usambara Mountains (-5.083333, 38.666667, 801 m ASL), coll. J. N. Raybould, 9 March 1972 GoogleMaps .
Diagnosis. Carapace lateral margin smooth, lacking teeth ( Fig. 1A, B View FIGURE 1 ); S3/4 distinct, U-shaped, completely traversing sternum ( Fig. 1A, B View FIGURE 1 ); margins of thoracic sternite S4 low ( Fig. 2B, C View FIGURE 2 ); cheliped carpus distal tooth small, pointed ( Fig. 3D View FIGURE 3 ); inferior margins of cheliped merus each lined by distinct small teeth, distal meral tooth small ( Fig. 3C View FIGURE 3 ); G1TA slim, tapering to slightly upcurved tip, dorsal lobe low, with tufts of long setae proximally, otherwise smooth ( Fig. 4A–E View FIGURE 4 ).
Description. Carapace surface smooth, widest in anterior third (CW/FW 3.0), medium height ( CH /FW 1.0) ( Figs. 1A, B View FIGURE 1 , 2A View FIGURE 2 ), semi-circular, urogastric grooves deep; cardiac region weakly marked, cervical grooves short, faint; transverse branchial grooves faint ( Fig. 1A, B View FIGURE 1 ). Front about 1/3 carapace width (FW/CW = 0.3); frontal margin straight ( Figs. 1A, B View FIGURE 1 , 2A View FIGURE 2 ); exorbital tooth small, blunt; epibranchial tooth reduced to granule; postfrontal crest sharply defined, complete, traversing entire carapace; carapace lateral margin posterior to epibranchial tooth smooth ( Fig. 1A, B View FIGURE 1 ). Branchiostegite with two sutures, one longitudinal (epimeral), one vertical, dividing carapace sidewall into suborbital, subhepatic, pterygostomial regions, all smooth ( Fig. 2A, B View FIGURE 2 ).
Third maxillipeds filling entire oral field, except for transversely oval efferent respiratory openings at superior lateral corners; third maxilliped long exopod with flagellum; ischium with broad, deep vertical sulcus ( Fig. 3E View FIGURE 3 ). Mandibular palp consisting of basis plus two articles; terminal article undivided, with small hardened ridge on superior margin at junction between articles ( Fig. 3F View FIGURE 3 ). Anterior, posterior male thoracic sternum surface completely smooth; outer margins of S4 low; sternal sutures S1/2 obscure, S2/3 completely traversing sternum; S3/4 distinct, U-shaped, completely traversing sternum; thoracic episternal sulci S4/E4, S5/E5, S6/E6, S7/E7 all faint ( Fig. 2B, C View FIGURE 2 ).
Male right (major) chela dactylus (movable finger) slightly arched, broad, cutting edge lacking teeth except for two low teeth proximally; propodus pollex (fixed finger) broad, cutting edge with three medium teeth proximally; tips of both fingers touching when chela closed, enclosing long narrow interspace; major chela propodus palm enlarged, swollen, lower margin distinctly concave ( Fig. 3A View FIGURE 3 ). Male left (minor) chela dactylus long, slim, straight, cutting edge lacking teeth; propodus pollex cutting edge lacking teeth; tips of both fingers touching when chela closed, enclosing long narrow interspace; propodus lower margin almost straight ( Fig. 3B View FIGURE 3 ). Cheliped merus stout; cheliped merus inferior margins lined by small teeth, distal meral tooth small ( Fig. 3C, D View FIGURE 3 ); cheliped carpus inner margin distal tooth medium sized, pointed; proximal tooth small, pointed, followed by granule ( Fig. 3D View FIGURE 3 ); ambulatory legs P2–5 stout, distal limb articles (merus, carpus, propodus, dactylus) not elongated; dactyli of P2–5 tapering to point, each bearing four rows of downward-pointing sharp bristles ( Fig. 1A View FIGURE 1 ). Male pleon, telson together forming slim triangle; pleon edges slightly indented; telson triangular, apex rounded, base broadest, sides sloping outward; pleomeres PL1–6 rectangular, wider than long, PL 6 longest, more than 1/2 as long as wide; remaining pleomeres short, less than 1/3 as long as wide ( Fig. 2C View FIGURE 2 ). G1TA about 1/3 G1SA length (G1TA/G1SA 0.3), angled outward at 45° to longitudinal axis of G1SA; G1TA slim, tapering evenly to slightly upcurved tip, dorsal lobe low, with tufts of long setae proximally, otherwise smooth ( Fig. 4A–E View FIGURE 4 ). G1SA widest at base, narrowest at G1TA-G1SA junction; basal G1SA mesial, lateral margins smooth ( Fig. 4A, B View FIGURE 4 ). G2TA long, flagellum-like, about 0.5 × G2SA length (G2TA/G2SA 0.5) ( Fig. 5A View FIGURE 5 ). G2SA ( Fig. 4F View FIGURE 4 ) long, slim, subequal to G1SA; G2SA widest at base, tapering sharply inward about one-third along length, distal 2/3rds forming long, thin, tapering, upright process ( Fig. 4F View FIGURE 4 ).
Size. Small-bodied species, adult size range between CWs 15.6–18.6 mm.
Color. The color of living specimens is unknown, but specimens preserved in ethanol are light brown.
Type locality. Tanzania, Amani Area GoogleMaps , East Usambara Mountains (-5.083333, 38.666667, 801 m ASL).
Etymology. The species name, “ picus ” (from the Latin for woodpecker), is a reference to the long, pointed tapering G1TA that resembles a stout woodpecker beak, together with the unusual distinctive tuft of long setae at the base of the terminal article of this species gives the G1TA a resemblance to the head of the cartoon character Woody Woodpecker, the mascot of Universal Pictures. The specific epithet is given a masculine ending and is used as a Latin noun in the genitive singular.
Distribution. Arcopotamonautes picus sp. nov. is known from a single locality in the East Usambara Mountain range in northeastern Tanzania ( Fig. 11 View FIGURE 11 ).
Habitat. See ‘Habitat’ for A. infravallatus below.
Comparisons. For comparisons see below.
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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Phylum |
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Class |
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Order |
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InfraOrder |
Brachyura |
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SuperFamily |
Potamoidea |
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Family |
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SubFamily |
Potamonautinae |
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Genus |